MAX6765, MAX6766, MAX6767, MAX6768, MAX6769, MAX6770, MAX6771, MAX6772, MAX6773, MAX6774

MAX6765, MAX6766, MAX6767, MAX6768, MAX6769, MAX6770, MAX6771, MAX6772, MAX6773, MAX6774
19-0657; Rev 3; 9/07
KIT
ATION
EVALU
LE
B
A
IL
A
AV
Automotive Micropower Linear Regulators
with Supervisor
♦
♦
♦
♦
♦
♦
♦
♦
Low 31µA Quiescent Current
4V to 72V Wide Input Voltage Range
100mA Output Current Capability
Dropout Voltage of 620mV with 5V Output
at 100mA
Fixed Output-Voltage Options: 5V, 3.3V, 2.5V,
and 1.8V
Watchdog Timer Option (1.6s (MAX6773/
MAX6774) and 50ms (MAX6773B/MAX6774B))
Adjustable Output Voltages from 1.8V to 11V
Open-Drain or Push-Pull RESET Output
Fixed or Capacitor-Adjustable Reset Timeouts
Small, Thermally Enhanced 1.9W, 3mm x 3mm
TDFN Package
Overtemperature and Short-Circuit Protection
Fully Specified from -40°C to +125°C
Ordering Information
TEMP
RANGE
PART
MAX6765TT_D_+
-40°C to +125°C
6 TDFN-EP*
T633-2
-40°C to +125°C
6 TDFN-EP*
T633-2
Ordering Information continued at end of data sheet.
The first “_” is a placeholder for the voltage output and reset
threshold. The 2nd “_” designates the fixed reset-timeout option.
See Tables 1 and 2 for details. For example, the MAX6765TTLD4
has a 5V output, a reset threshold of 4.65V, and a 200ms typical
reset timeout.
+Denotes lead-free package.
*EP = Exposed paddle.
For tape-and-reel orders add a “T” after the “+” symbol to complete the part number. Tape-and-reel orders are available in
2.5k increments. Nonstandard versions require a 10k minimum
order quantity.
RESET
TOP VIEW
TIMEOUT
Pin Configurations
6
5
4
MAX6765
MAX6766
IN
1
Typical Application Circuit and Selector Guide appear at
end of data sheet.
2
3
ENABLE
+
GND
Applications
PKG
CODE
MAX6766TT_D_+
The MAX6765–MAX6774B are available in a small, thermally enhanced 3mm x 3mm TDFN package that can
dissipate up to 1.951W, thereby supporting continuous
regulator operation during high ambient temperatures,
high battery voltage, and high load-current conditions.
The MAX6765–MAX6774B are fully specified for a -40°C
to +125°C operating temperature range.
Automotive
Industrial
Telecom
PINPACKAGE
OUT
The MAX6765–MAX6774B are low-quiescent-current,
high-voltage linear regulators that operate from 4V to 72V
and deliver up to 100mA of load current. These lowpower devices consume only 31µA of quiescent current,
making them ideal for always-on automotive modules.
These devices are offered with fixed standard output
options of 5.0V, 3.3V, 2.5V, and 1.8V, or can be adjusted
from 1.8V to 11V with two external resistors.
The MAX6765–MAX6774B feature a push-pull or opendrain, active-low RESET output with either fixed or
adjustable thresholds. Whenever the regulator’s output
falls below the reset threshold, the RESET output asserts
and remains asserted for at least the minimum reset
timeout period after the output voltage exceeds its
threshold. The minimum reset timeout period is offered
with fixed values from 75µs to 200ms or can be adjusted
externally with a small capacitor.
These devices provide three regulator enable modes to
accommodate several power-on schemes. The
MAX6765/MAX6766/MAX6769/MAX6770/MAX6773/
MAX6773B/MAX6774/MAX6774B feature a single traditional enable input (ENABLE) to turn on and off the regulator. The MAX6771/MAX6772 provide dual enable inputs
(ENABLE1 and ENABLE2) to turn on and off the regulator
either through an ignition switch or a bus transceiver. The
MAX6767/MAX6768 provide a hold input (HOLD) in addition to the enable input to allow for the implementation of a
self-holding circuit without requiring external components.
Setting HOLD low after enabling the regulator forces the
regulator to remain on even if ENABLE is subsequently
set low. Releasing HOLD shuts down the regulator.
The MAX6773/MAX6773B/MAX6774/MAX6774B also
include a watchdog input that monitors a pulse train from
the microprocessor (µP) and generates a reset pulse if
the watchdog input remains high or low for a duration
longer than the 1.6s (typ) (MAX6773/MAX6774) or 50ms
(typ) (MAX6773B/MAX6774B) watchdog timeout period.
Features
♦
♦
♦
♦
TDFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX6765–MAX6774
General Description
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
ABSOLUTE MAXIMUM RATINGS
(All pins referenced to GND, unless otherwise noted.)
VIN ..........................................................................-0.3V to +80V
OUT ................................................-0.3V to min (12V, IN + 0.3V)
ENABLE, ENABLE1, ENABLE2 .....................-0.3V to (IN + 0.3V)
RESET (open-drain output), TIMEOUT, WDI,
RESETIN, SET ......................................................-0.3V to 12V
RESET (push-pull output), HOLD ..............-0.3V to (OUT + 0.3V)
Maximum Current (all pins except IN and OUT).................50mA
Continuous Power Dissipation (TA = +70°C)
6-Pin TDFN 3mm x 3mm
(derate 23.8mW/°C above +70°C) ...........................1904.8mW
8-Pin TDFN 3mm x 3mm
(derate 24.4mW/°C above +70°C) ...........................1951.2mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 14V, CIN = 0.1µF, COUT = 10µF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.)
(Note 1)
PARAMETER
Supply Voltage Range
SYMBOL
VIN
Supply Current
(MAX6765–MAX6772) (Note 2)
Supply Current
(MAX6773/MAX6773B/
MAX6774/MAX6774B)
(Note 2)
Shutdown Supply Current
Output Voltage
ISHDN
VOUT
Adjustable Output Voltage Range
VOUT
SET Threshold Voltage
(MAX6767–MAX6774)
VSET
Dual Mode™ SET Threshold
CONDITIONS
MIN
TYP
4
UNITS
72
V
ILOAD = 0
31
45
ILOAD = 50mA
35
50
ILOAD = 100mA, VIN = 14V
37
55
ILOAD = 0, VIN = 42V
35
50
ILOAD = 10mA, VIN = 42V
37
55
ILOAD = 0
ILOAD = 50mA
ILOAD = 100mA
ILOAD = 0, VIN = 42V
38
42
44
42
50
55
60
55
ILOAD = 10mA, VIN = 42V
44
60
ENABLE , ENABLE1, ENABLE2 = GND
3.3
7
5
5.075
4.850
5
5.150
3.251
3.3
3.350
T/S, 1mA ≤ ILOAD ≤ 100mA, VIN = 9.3V
3.201
3.3
3.399
Z/Y, ILOAD = 1mA
2.463
2.5
2.538
Z/Y, 1mA ≤ ILOAD ≤ 100mA, VIN = 8.5V
2.425
2.5
2.575
W/V, ILOAD = 1mA
1.773
1.8
1.827
W/V, 1mA ≤ ILOAD ≤ 100mA, VIN = 7.8V
1.746
1.8
1.854
L/M, ILOAD = 1mA
4.925
L/M, 1mA ≤ ILOAD ≤ 100mA, VIN = 11V
T/S, ILOAD = 1mA
1.8
ILOAD = 1mA
1.20
1.233
SET rising
116
SET falling
58
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2
MAX
_______________________________________________________________________________________
µA
µA
µA
V
11.0
V
1.26
V
mV
Automotive Micropower Linear Regulators
with Supervisor
(VIN = 14V, CIN = 0.1µF, COUT = 10µF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.)
(Note 1)
PARAMETER
SET Input Current
(MAX6767–MAX6774)
Dropout Voltage (Note 3)
SYMBOL
ISET
∆VDO
CONDITIONS
VSET = 1.5V, VIN = 11V
MIN
TYP
-100
MAX
UNITS
+100
nA
L/M, 5V output option, ILOAD = 10mA
60
L/M, 5V output option, ILOAD = 50mA
300
630
L/M, 5V output option, ILOAD = 100mA
620
1200
T/S, 3.3V output option, ILOAD = 100mA
866
1600
Guaranteed Output Current
(Note 4)
130
100
Output Current Limit
Output shorted to GND, VIN = 14V
150
mV
mA
250
mA
Thermal-Shutdown Temperature
160
°C
Thermal-Shutdown Hysteresis
20
°C
Line Regulation
6.5V ≤ VIN ≤ 72V, ILOAD = 1mA
Load Regulation
(MAX6767–MAX6774)
IOUT = 1mA to 100mA,
VIN = VOUT(NOM) + 6V
1
%
1.5
%
Power-Supply Rejection Ratio
PSRR
ILOAD = 10mA, fIN = 100Hz, 500mVP-P
70
dB
Startup Response Time
tSTART
From ENABLE high to OUT,
ILOAD = 100mA
180
µs
Output Overvoltage Protection
Threshold
OVTH
ISINK = 1mA (from OUT)
Output Overvoltage Protection
Maximum Sink Current
1.07 x
VOUT
OUT = OUT(NOM) x 1.15
5
1.1 x
VOUT
1.13 x
VOUT
10
V
mA
LOGIC INPUT (ENABLE, ENABLE1, ENABLE2, HOLD)
Input Low Voltage
VIL
ENABLE, ENABLE1, ENABLE2
Input High Voltage
VIH
ENABLE, ENABLE1, ENABLE2
ENABLE, ENABLE1, ENABLE2
Input Pulldown Current
ENABLE, ENABLE1, ENABLE2 are
internally pulled down to GND
VIL
1.8V ≤ VOUT ≤ 11V
VIH
1.8V ≤ VOUT ≤ 11V
V
V
0.6
µA
0.4
HOLD Input Threshold Voltage
HOLD Input Pullup Current
0.4
1.4
V
OUT 0.4
HOLD is internally pulled up to OUT
1.8
µA
RESET OUTPUT
RESET Threshold
SET = GND,
RESET falling
L
4.500
4.625
4.750
M
4.250
4.375
4.500
T
2.970
3.053
3.135
S
2.805
2.888
2.970
Z
2.250
2.313
2.375
Y
2.125
2.188
2.250
W
1.620
1.665
1.710
V
1.530
1.575
1.620
V
_______________________________________________________________________________________
3
MAX6765–MAX6774
ELECTRICAL CHARACTERISTICS (continued)
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 14V, CIN = 0.1µF, COUT = 10µF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.)
(Note 1)
PARAMETER
SYMBOL
RESET Threshold (Adjustable
Output Voltage)
RESETIN Input Current
CONDITIONS
MIN
TYP
MAX
L/T/Z/W, SET = resistive divider, RESET
falling
VOUT x
0.9
VOUT x
0.925
VOUT x
0.950
M/S/Y/V, SET = resistive divider, RESET
falling
VOUT x
0.85
VOUT x
0.875
VOUT x
0.900
UNITS
V
RESETIN = GND or 12V
-100
VTH = 87.5% of VSET (M/S/Y/V),
RESET falling
1.057
+100
1.085
nA
1.112
RESETIN Threshold
V
VTH = 92.5% of VSET (L/T/Z/W),
RESET falling
1.118
1.147
1.176
OUT to RESET Delay
VOUT falling
0.3
RESETIN To RESET Delay
RESETIN falling
35
µs
75
µs
D0
RESET Timeout Period (TIMEOUT
Connected to OUT)
VOUT rising
D1
2.187
3.125
4.063
D2
8.75
12.5
16.25
D3
35
50
65
D4
140
200
260
800
1000
1200
nA
1.160
1.22
1.259
V
TIMEOUT Ramp Current
TIMEOUT Ramp Threshold
RESET Output-Voltage Low
(Open Drain or Push-Pull)
RESET Output-Voltage High
(Push-Pull)
VOL
VOH
RESET Open-Drain Leakage
Current
VOUT ≥ 1.8V, ISINK = 50µA,
RESET asserted
0.3
VOUT ≥ 1.8V, ISINK = 3.2mA,
RESET asserted
0.4
ms
V
VOUT ≥ 1.8V, ISOURCE = 250µA,
RESET not asserted
0.8 x
VOUT
V
RESET not asserted, RESET = 12V
Watchdog Minimum Input Pulse
tWDI
1.8V ≤ VOUT ≤ 11V
Watchdog Input Low Voltage
VIL
1.8V ≤ VOUT ≤ 11V
VIH
1.8V ≤ VOUT ≤ 11V
Watchdog Input Low Voltage
VIL
1.8V ≤ VOUT ≤ 11V
Watchdog Input Current
IWDI
WDI = 0V or WDI = 12V
Watchdog Timeout Period
tWD
Watchdog Input High Voltage
µs
MAX6773/MAX6774
MAX6773B/MAX6774B
100
1
nA
µs
0.4
VOUT
- 0.4V
V
V
-1
0.4
V
+1
µA
1.12
1.6
2.08
s
40
50
60
ms
Note 1: Production tested at TA = +25°C. Overtemperature limits are guaranteed by design.
Note 2: Device tested at internally set voltage.
Note 3: Dropout voltage for L/M versions is defined as (VIN - VOUT) when VOUT equals 98% of the nominal value of VOUT when
VIN = 11V. For T/S versions, dropout voltage is defined as (VIN - VOUT) when VOUT equals 98% of the nominal value of VOUT
when VIN = 9.3V.
Note 4: Observe the absolute maximum power dissipation limits.
4
_______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
34
ILOAD = 0
30
41
ILOAD = 50mA
37
35
ILOAD = 1mA
33
28
31
26
29
ILOAD = 0
MAX6765 toc03
3.5
3.0
2.5
2.0
1.5
TEMPERATURE (°C)
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
NORMALIZED RESETIN THRESHOLD VOLTAGE
vs. TEMPERATURE
DROPOUT VOLTAGE
vs. LOAD CURRENT
52
60
68
MAX6765 toc04
28
44
36
52
60
68
-40 -25 -10 5 20 35 50 65 80 95 110 125
INPUT VOLTAGE (V)
600
550
500
450
400
350
300
250
200
150
100
50
0
VOUT = 5V
0
10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
5.20
VOUT = 5V
5.15
5.10
5.05
5.00
4.95
VOUT = 3.3V
3.34
3.32
OUTPUT VOLTAGE (V)
20
OUTPUT VOLTAGE (V)
12
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
0.994
0.993
0.992
MAX6765 toc08
44
DROPOUT VOLTAGE (mV)
36
MAX6765 toc05
28
MAX6765 toc06
-40 -25 -10 5 20 35 50 65 80 95 110 125
INPUT VOLTAGE (V)
20
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4
4.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
12
NORMALIZED RESETIN THRESHOLD VOLTAGE
4
4.5
1.0
27
24
SUPPLY CURRENT (µA)
ILOAD = 100mA
39
5.0
SHUTDOWN SUPPLY CURRENT (µA)
36
32
43
MAX6765 toc07
SUPPLY CURRENT (µA)
ILOAD = 100mA
38
VOUT = 5V
45
SUPPLY CURRENT (µA)
LIMITED BY POWER
DISSIPATION
40
47
MAX6765 toc02
VOUT = 3.3V
42
MAX6765 toc01
44
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. INPUT VOLTAGE
3.30
3.28
3.26
3.24
4.90
3.22
4.85
3.20
4.80
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
_______________________________________________________________________________________
5
MAX6765–MAX6774
Typical Operating Characteristics
(VIN = 14V, COUT = 10µF, CIN = 0.1µF, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VIN = 14V, COUT = 10µF, CIN = 0.1µF, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. LOAD CURRENT
1.80
1.79
1.78
1.77
80
60
40
20
1.76
1.75
10 20 30 40 50 60 70 80 90 100
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0
0
MAX6765 toc11
MAX6765 toc10
100
1.08
0
25
50
LOAD CURRENT (mA)
75
100
-40 -25 -10 5 20 35 50 65 80 95 110 125
125
CAPACITOR VALUE (nF)
NORMALIZED WATCHDOG TIMEOUT
vs. TEMPERATURE
1.04
RESET OUTPUT vs. SOURCE CURRENT
RESET OUTPUT vs. SINK CURRENT
4.0
MAX6765 toc12
1.06
TEMPERATURE (°C)
5.5
VOUT = 5V
3.5
4.5
RESET OUTPUT (V)
1.00
0.98
0.96
RESET OUTPUT (V)
3.0
1.02
2.5
2.0
1.5
0.94
1.0
0.92
0.5
0.90
0
VOUT = 5V
5.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
0.5
0
0
5
TEMPERATURE (°C)
15
20
25
30
35
0
40
2
4
6
OUT AND HOLD vs. ENABLE
41
MAX6765 toc15
VOUT = 5V
ENABLE
5V/div
40
39
GATE
5V/div
38
37
HOLD
5V/div
36
OUT
5V/div
35
34
0.001
0.01
0.1
1
10
WATCHDOG INPUT FREQUENCY (kHz)
100
8
10
12
SOURCE CURRENT (mA)
MAX6765 toc16
42
SUPPLY CURRENT (µA)
10
SINK CURRENT (mA)
SUPPLY CURRENT
vs. WATCHDOG INPUT FREQUENCY
6
MAX6765 toc14
1.81
120
NORMALIZED RESET TIMEOUT PERIOD
1.82
140
1.10
MAX6765 toc13
OUTPUT VOLTAGE (V)
1.83
160
RESET TIMEOUT PERIOD (ms)
VOUT = 1.8V
1.84
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
RESET TIMEOUT PERIOD
vs. CAPACITOR VALUE
MAX6765 toc09
1.85
NORMALIZED WATCHDOG TIMEOUT
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
20ms/div
(SEE TEST CIRCUIT FOR ENABLE AND HOLD)
_______________________________________________________________________________________
14
16
Automotive Micropower Linear Regulators
with Supervisor
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
NORMALIZED OUT VOLTAGE
vs. INPUT VOLTAGE
20
VOUT = 3.3V
1.0015
NORMALIZED OUT VOLTAGE
0
-20
-40
-60
-80
-100
-120
MAX6765 toc18
1.0020
MAX6765 toc17
1.0010
1.0005
1.0000
0.9995
0.9990
-140
0.9985
-160
-180
0.9980
0.1
1
10
100
1k
10k
100k
1M
4
12
20
28
FREQUENCY (Hz)
36
44
52
60
68
INPUT VOLTAGE (V)
LINE-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
MAX6765 toc20
MAX6765 toc19
VOUT = 5V
VOUT = 5V
OUT
(AC-COUPLED)
1V/div
OUT
(AC-COUPLED)
200mV/div
VIN
10V/div
IOUT
100mA/div
400µs/div
100ms/div
OUTPUT CAPACITOR SERIES RESISTANCE
vs. LOAD CURRENT
LINE-TRANSIENT RESPONSE
VOUT = 5V
OUT
(AC-COUPLED)
1V/div
VIN
20V/div
400µs/div
11
MAX6765 toc22
MAX6765 toc21
OUTPUT CAPACITOR SERIES RESISTANCE (Ω)
POWER-SUPPLY REJECTION RATIO (dB)
40
10
9
8
7
6
STABLE OPERATING
REGION
5
4
3
2
1
0
0
20
40
60
80
100
LOAD CURRENT (mA)
_______________________________________________________________________________________
7
MAX6765–MAX6774
Typical Operating Characteristics (continued)
(VIN = 14V, COUT = 10µF, CIN = 0.1µF, TA = +25°C, unless otherwise noted.)
Automotive Micropower Linear Regulators
with Supervisor
MAX6765–MAX6774
Enable and Hold Test Circuit
VIN
IN
ENABLE
OUT
OUT
MAX6767
MAX6768
ENABLE
HOLD
HOLD
GND
N
GATE
TEST CIRCUIT FOR OUT AND HOLD VS. ENABLE
Pin Description
PIN
MAX6765/ MAX6767/
MAX6766 MAX6768
MAX6771/
MAX6772
MAX6773/
MAX6773B/
MAX6774/
MAX6774B
NAME
FUNCTION
Regulator Input. Bypass IN to GND with a capacitor
with a minimum value of 0.1µF.
1
1
1
1
1
IN
2
2
2
2
2
GND
3
3
3
—
3
ENABLE
Active-High Enable Input. Drive ENABLE high to turn
on the regulator. ENABLE is internally connected to
GND through a 0.6µA current sink.
RESET
Active-Low, Open-Drain/Push-Pull Reset Output.
For the MAX6769/MAX6770, RESET asserts when
RESETIN is below the internal VTH and deasserts
when RESETIN is above the internal VTH threshold.
For all other versions, RESET remains low while OUT
is below the reset threshold. For all versions, RESET
remains low for the duration of the reset timeout
period after the reset conditions end.
4
5
6
8
MAX6769/
MAX6770
5
7
8
5
7
8
5
7
8
5
7
8
Ground
Reset Timeout Adjust Input. Connect TIMEOUT to
OUT for the internally fixed timeout period. For an
TIMEOUT adjustable timeout, connect a capacitor from
TIMEOUT to GND. See the Selecting Timeout
Capacitor section.
OUT
Regulator Output. The MAX6765/MAX6766 provide
a fixed output (+1.8V, +2.5V, +3.3V, or +5V). The
MAX6767–MAX6774 provide a fixed output voltage
of +1.8V, +2.5V, +3.3V, or 5V, or adjust the output
from +1.8V to +11V. Bypass to GND with a 10µF
capacitor (min).
_______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
PIN
MAX6765/ MAX6767/
MAX6766 MAX6768
—
4
MAX6769/
MAX6770
—
MAX6771/
MAX6772
—
MAX6773/
MAX6773B/
MAX6774/
MAX6774B
—
NAME
FUNCTION
HOLD
Active-Low Regulator Hold Input. When HOLD is
forced low, OUT remains on even if ENABLE is pulled
low. To shut down the regulator, release HOLD after
ENABLE is pulled low. Connect HOLD to OUT or
leave unconnected if unused. HOLD is internally
connected to OUT through a 1.8µA current source.
Feedback Input for Setting the Output Voltage.
Connect SET to GND to select the preset output
voltage. Connect to an external resistive divider for
adjustable output operation.
—
6
6
6
6
SET
—
—
4
—
—
RESETIN
—
—
—
3
—
Active-High Enable Input 1. Drive ENABLE1 high to
ENABLE1 turn on the regulator. ENABLE1 is internally
connected to ground through a 0.6µA current sink.
—
—
—
4
—
Active-High Enable Input 2. Drive ENABLE2 high to
ENABLE2 turn on the regulator. ENABLE2 is internally
connected to ground through a 0.6µA current sink.
—
EP
—
EP
—
EP
—
EP
4
EP
Detailed Description
The MAX6765–MAX6774B low-quiescent-current, highvoltage linear regulators operate from a 4V to 72V input
voltage and deliver more than 100mA of load current.
The MAX6765–MAX6774B include an integrated µP
reset circuit that monitors the regulator output voltage
and asserts a reset output when OUT falls below a
threshold limit, and includes an internally fixed or
adjustable reset timeout using a capacitor from TIMEOUT to ground. All devices are available in a preset output-voltage option of +1.8V, +2.5V, +3.3V, and +5V. The
Adjustable Reset Threshold Input. Connect to a
resistive divider to set the desired threshold.
WDI
Watchdog Timer Input. If WDI remains high or low for
longer than the watchdog timeout period, the
internal watchdog timer expires and the reset output
asserts for the reset timeout period. The internal
watchdog timer clears whenever a reset is asserted
or WDI sees a rising or falling edge. The watchdog
timer cannot be disabled. Do not leave WDI
unconnected.
—
Exposed Paddle. EP is internally connected to GND.
Connect EP to the ground plane to provide a low
thermal-resistance path from the IC junction to the
PCB. Do not use as the electrical connection to GND.
output voltage of the MAX6767–MAX6774B is adjustable
from +1.8V to +11V using a resistive divider at SET. The
MAX6773/MAX6774 include a watchdog timer (WDI)
with a 1.6s (typ) watchdog timeout period and the
MAX6773B/MAX6774B include a watchdog timer with a
50ms (typ) watchdog timeout period. The MAX6769/
MAX6770 feature an adjustable reset threshold using a
resistive divider between the monitored voltage,
RESETIN, and GND; see the Functional Diagrams.
The MAX6771/MAX6772 provide dual enable inputs
(ENABLE1 and ENABLE2) to turn on and off the regulator either through an ignition switch or a bus transceiver.
_______________________________________________________________________________________
9
MAX6765–MAX6774
Pin Description (continued)
Automotive Micropower Linear Regulators
with Supervisor
MAX6765–MAX6774
Functional Diagrams
THERMAL
PROTECTION
MAX6765/MAX6766
OUT
IN
OVERCURRENT
PROTECTION
ENABLE
CONTROL
LOGIC
1.147V
1.233V
RESET
TIMEOUT
RESET
OR
1.085V
TIMEOUT
GND
10
______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
THERMAL
PROTECTION
MAX6767/MAX6768
OUT
IN
OVERCURRENT
PROTECTION
ENABLE
HOLD
CONTROL
LOGIC
SET
116mV
1.147V
1.233V
RESET
TIMEOUT
RESET
OR
1.085V
TIMEOUT
GND
______________________________________________________________________________________
11
MAX6765–MAX6774
Functional Diagrams (continued)
Automotive Micropower Linear Regulators
with Supervisor
MAX6765–MAX6774
Functional Diagrams (continued)
THERMAL
PROTECTION
MAX6769/MAX6770
OUT
IN
OVERCURRENT
PROTECTION
ENABLE
CONTROL
LOGIC
SET
116mV
1.147V
RESET
TIMEOUT
1.233V
RESET
OR
1.085V
RESETIN
TIMEOUT
GND
12
______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
THERMAL
PROTECTION
MAX6771/MAX6772
OUT
IN
OVERCURRENT
PROTECTION
ENABLE1
ENABLE2
CONTROL
LOGIC
SET
116mV
1.147V
RESET
TIMEOUT
1.233V
RESET
OR
1.085V
TIMEOUT
GND
______________________________________________________________________________________
13
MAX6765–MAX6774
Functional Diagrams (continued)
Automotive Micropower Linear Regulators
with Supervisor
MAX6765–MAX6774
Functional Diagrams (continued)
THERMAL
PROTECTION
MAX6773/MAX6773B
MAX6774/MAX6774B
OUT
IN
OVERCURRENT
PROTECTION
ENABLE
CONTROL
LOGIC
SET
116mV
1.147V
RESET
TIMEOUT
1.233V
RESET
OR
1.085V
TIMEOUT
WDI
GND
14
______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
VIN
IN
OUT
R1
Enable and Hold Inputs
(MAX6767/MAX6768)
The MAX6767/MAX6768 support two logic inputs,
ENABLE (active-high) and HOLD (active-low), making
these devices “automotive friendly.” For example, when
the ignition key signal drives ENABLE high, the regulator
turns on and remains on even if ENABLE goes low, as
long as HOLD is forced low and kept low before
ENABLE goes low. In this state, releasing HOLD turns
the regulator output (OUT) off. This feature makes it possible to implement a self-holding circuit without external
components. Forcing ENABLE low with HOLD high (or
unconnected) places the MAX6767/MAX6768 into shutdown mode, drawing 3.3µA (typ) of supply current.
Table 3 shows the state of the regulator output with
respect to the voltage level at ENABLE and HOLD.
Connect HOLD to OUT or leave it unconnected to allow
the ENABLE input to act as a standard enable/shutdown switch for the regulator output (OUT).
MAX6767–MAX6774B
SET
Figure 1. Setting the Output Voltage Using a Resistive Divider
Table 1. Preset Timeout Period
PART NUMBER
SUFFIX (_)
TIMEOUT
PERIOD
D0
75µs
D1
3.125ms
D2
12.5ms
D3
50ms
D4
200ms
Reset Output
The reset output is typically connected to the reset
input of a µP. A µP’s reset input starts or restarts the µP
in a known state. The MAX6765–MAX6774B supervisory circuits provide the reset logic to prevent code-execution errors during power-up, power-down, and
brownout conditions (see the Typical Application
Circuit). RESET changes from high to low whenever the
monitored voltage drops below the reset threshold voltages. Once the monitored voltage exceeds its respective reset threshold voltage(s), RESET remains low for
the reset timeout period, then goes high. See Table 1.
R2
GND
Table 2. Preset Output Voltage and Reset
Threshold
PART NUMBER
SUFFIX (_)
OUTPUT
VOLTAGE (V)
RESET
THREHOLD (V)
L
5
4.625
M
5
4.375
T
3.3
3.053
RESETIN Threshold (MAX6769/MAX6770)
S
3.3
2.888
The MAX6769/MAX6770 monitor the voltage on RESETIN
using an adjustable reset threshold (VRESETIN) set with
an external resistive voltage-divider and the internal reset
threshold VTH. See Table 2.
Z
2.5
2.313
Y
2.5
2.188
W
1.8
1.665
V
1.8
1.575
______________________________________________________________________________________
15
MAX6765–MAX6774
Regulator
The regulator accepts an input voltage from +4V to +72V.
All of the devices feature fixed output-voltage options of
+1.8V, +2.5V, +3.3V, and +5V. The MAX6767-MAX6774B
feature an adjustable output voltage set with an external
resistive-divider network connected between OUT, SET,
and GND. See Figure 1.
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
Table 3. ENABLE/HOLD Truth Table/State Table
OPERATING
STATE
ENABLE
HOLD
REGULATOR
OUTPUT
Initial State
Low
Don’t care
Off
ENABLE is pulled to GND through an internal pulldown. HOLD is
floating (pulled up to OUT). Regulator output is disabled.
Turn-On State
High
Don’t care
On
ENABLE is externally driven high turning the regulator output on.
HOLD is pulled up by OUT.
Hold
Setup State
High
Low
On
HOLD is externally pulled low while ENABLE remains high (latches
HOLD state).
Hold State
Low
Low
On
ENABLE is driven low (or allowed to float low by an internal pulldown).
HOLD remains externally pulled low keeping the regulator output on.
Off-State
Low
High
(floats high)
Off
HOLD is driven high (or allowed to float high by an internal pullup)
while ENABLE is low. Regulator output is shut off and ENABLE/
HOLD logic returns to the initial state.
COMMENT
Watchdog Timer (MAX6773/MAX6773B/
MAX6774/MAX6774B)
The MAX6773/MAX6774 include a watchdog timer that
asserts RESET if the watchdog input (WDI) does not
toggle within the watchdog timeout period t WD (1.6s
(typ) for the MAX6773/MAX6774 and 50ms (typ) for the
MAX6773B/MAX6774B). RESET remains low for the
reset timeout period, tRP. If the watchdog is not updated for lengthy periods of time, the reset output appears
as a pulse train, asserted for the reset timeout period
and deasserted for the watchdog timeout period, until
WDI is toggled again. When RESET asserts, it stays low
for the entire reset timeout period ignoring any WDI
transitions. To prevent the watchdog from asserting
RESET, toggle WDI with a valid rising or falling edge
prior to tWD (min). The watchdog counter clears when
WDI toggles prior to tWD or when RESET asserts. The
watchdog resumes counting after RESET deasserts.
The watchdog timer cannot be disabled.
Thermal Protection
When the junction temperature exceeds TJ = +160°C
(typ), an internal thermal sensor signals the shutdown
logic that turns off the pass transistor and allows the IC
to cool. The thermal sensor turns the pass transistor on
again after the IC’s junction temperature cools by 20°C
(typ), resulting in a cycled output during continuous
thermal-overload conditions. Thermal protection protects the MAX6765–MAX6774B in the event of a fault
condition. Never exceed the absolute maximum junction
temperature rating of TJ = +150°C. See Figures 3 and 4
for the safe operating area.
Applications Information
voltage mode. In preset voltage mode, internal trimmed
feedback resistors set the internal linear regulator to
+1.8V, +2.5V, +3.3V, or +5V (see Table 2). Select preset-voltage mode by connecting SET to ground. In
adjustable mode, select an output voltage between
+1.8V and +11V using two external resistors connected
as a voltage-divider to SET (see Figure 1). Set the output
voltage using the following equation:
VOUT = VSET (1 + R1 / R2)
where VSET = 1.233V and the recommended value for
R2 is 50kΩ (maximum 100kΩ).
RESETIN Threshold Selection
The MAX6769/MAX6770 feature an adjustable reset
threshold to monitor the voltage on RESETIN using a
resistive divider between the monitored voltage,
RESETIN and GND. See Figure 2. Use the following formula to set the desired reset threshold:
VMON = VTH (1 + R3 / R4)
where V TH is 1.085V for the M/S/Y/V versions and
1.147V for L/T/Z/W versions.
VIN
VMON
IN
R3
MAX6769
MAX6770
RESETIN
R4
RESET
GND
Output Voltage Selection
The MAX6767–MAX6774B feature dual-mode operation:
these devices operate in either a preset or adjustable
16
Figure 2. RESETIN Threshold Selection
______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Selecting Timeout Capacitor
The reset timeout period is adjustable to accommodate
a variety of µP applications. Adjust the reset timeout
period by connecting a capacitor between TIMEOUT
and GND.
tRP = CTIMEOUT x 1.22 x 106Ω
DERATE 23.8mW/°C
ABOVE +70°C
2.2
1.8
1.6
1.6
1.4
1.2
1.0
1.4
1.2
1.0
SAFE OPERATING
AREA
0.8
1.951W
2.0
PD (W)
PD (W)
1.8
For stable operation over the full temperature range and
with load currents up to 100mA, use a 10µF (min) output
capacitor with an ESR < 0.5Ω. To reduce noise and
improve load-transient response, stability, and powersupply rejection, use larger output-capacitor values.
Some ceramic dielectrics exhibit large capacitance
and ESR variation with temperature. For dielectric
capacitors such as Z5U and Y5V, use more capacitance to ensure stability at low temperatures. With X7R
or X5R dielectrics, 10µF should be sufficient at all operating temperatures. For higher-ESR tantalum capacitors, use larger capacitor values to maintain stability. To
improve power-supply rejection and transient
response, use a larger capacitor than the minimum
0.1µF capacitor between IN and GND.
DERATE 24.4mW/°C
ABOVE +70°C
SAFE OPERATING
AREA
MAX6765 fig04
1.904W
2.0
Capacitor Selection and
Regulator Stability
MAX6765 fig03
2.2
where tRP is in seconds and CTIMEOUT is in Farads.
Connect TIMEOUT to OUT to select the internally fixed
timeout period. C TIMEOUT must be a low-leakage
(< 10nA) type capacitor. Ceramic capacitors are
recommended; do not use capacitor values lower than
100pF to avoid the influence of parasitic capacitances.
0.8
0.6
0.6
0.4
0.2
0.4
0.2
0
0
0
20
40
60
80
100 120 140 160
TEMPERATURE (°C)
Figure 3. Maximum Power Dissipation vs. Temperature
(MAX6765/MAX6766)
0
20
40
60
80
100 120 140 160
TEMPERATURE (°C)
Figure 4. Maximum Power Dissipation vs. Temperature
(MAX6767–MAX6774B)
______________________________________________________________________________________
17
MAX6765–MAX6774
Available Output-Current Calculation
The MAX6765–MAX6774B provide up to 100mA of load
current. Package power dissipation limits the amount of
output current available for a given input/output voltage
and ambient temperature. Figures 3 and 4 depict the
maximum power dissipation curve for the MAX6765/
MAX6766 and MAX6767–MAX6774B, respectively. The
graph assumes that the exposed metal pad of the
device package is soldered to a solid 1in2 section of
2oz. PCB copper (JESD51-3 AND JESD51-5). Use
Figure 4 to determine the allowable package dissipation for a given ambient temperature. Alternately, use
the following formula to calculate the allowable package dissipation:
PDMAX = Max. Power Dissip = 1.951W, for TA ≤ +70°C
PDMAX = Max. Power Dissip = [1.9W - 0.0244W x
(TA - 70°C)], for +70°C < TA ≤ +125°C
where 0.0244W is the MAX6767–MAX6774B package
thermal derating in W/°C and TA is the ambient temperature in °C, under the same conditions used for Figure 4.
After determining the allowable package dissipation,
calculate the maximum output current using the following formula:
PD < PDMAX where PD = [(VIN - VOUT) x IOUT]
Also, IOUT should be ≤ 100mA in any case.
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
Ensuring a Valid RESET Output Down to
VIN = 0V (MAX6766/MAX6768/MAX6770/
MAX6772/MAX6774/MAX6774B)
VIN
When VIN falls below 1V, RESET current-sinking capabilities decline drastically. High-impedance CMOSlogic inputs connected to RESET can drift to
undetermined voltages. This presents no problems in
most applications, since most µPs and other circuitry
do not operate with supply voltages below 1V. In those
applications where RESET must be valid down to 0V,
adding a pulldown resistor between RESET and ground
sinks any stray leakage currents, holding RESET low
(Figure 5). The value of the pulldown resistor is not critical; 100kΩ is large enough not to load RESET and
small enough to pull RESET to ground. Open-drain
RESET versions are not recommended for applications
requiring valid logic for VIN down to 0V.
IN
MAX6766
MAX6768
MAX6770
MAX6772
MAX6774
MAX6774B
RESET
GND
Figure 5. Ensuring RESET Valid to VIN = 0V
Table 4. Standard Version Part Numbers
18
PART
OUTPUT
VOLTAGE (V)
RESET TIMEOUT
PERIOD (ms)
RESET THRESHOLD
(V)
TOP MARK
MAX6765TTLD2+T
5
12.5
4.625
+AQB
+AQL
MAX6765TTSD2+T
3.3
12.5
2.888
MAX6766TTLD2+T
5
12.5
4.625
+ARO
MAX6766TTSD2+T
3.3
12.5
2.888
+ARZ
+AVI
MAX6767TALD2+T
5
12.5
4.625
MAX6767TASD2+T
3.3
12.5
2.888
+AVS
MAX6768TALD2+T
5
12.5
4.625
+AVZ
+AXE
MAX6768TASD2+T
3.3
12.5
2.888
MAX6769TALD2+T
5
12.5
4.625
+AYH
MAX6769TASD2+T
3.3
12.5
2.888
+AYQ
+AZS
MAX6770TALD2+T
5
12.5
4.625
MAX6770TASD2+T
3.3
12.5
2.888
+BAC
MAX6771TALD2+T
5
12.5
4.625
+BEG
MAX6771TASD2+T
3.3
12.5
2.888
+BEQ
MAX6772TALD2+T
5
12.5
4.625
+APY
MAX6772TASD2+T
3.3
12.5
2.888
+BGC
MAX6773TALD2+T
5
12.5
4.625
+BBG
MAX6773TASD2+T
3.3
12.5
2.888
+AQE
MAX6773BTALD2+T
5
12.5
4.625
+BHK
MAX6773BTASD2+T
+BHU
3.3
12.5
2.888
MAX6774TALD2+T
5
12.5
4.625
+BCS
MAX6774TASD2+T
3.3
12.5
2.888
+BDC
MAX6774BTALD2+T
5
12.5
4.625
+BIY
MAX6774BTASD2+T
3.3
12.5
2.888
+BJI
______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
PART
RESET
OUTPUT
TYPICAL
WATCHDOG
TIMEOUT
OUTPUT
VOLTAGE
ENABLE
INPUTS
RESETIN
THRESHOLD
HOLD INPUT
MAX6765
Open drain
—
Fixed
—
Single
—
MAX6766
Push-pull
—
Fixed
—
Single
—
MAX6767
Open drain
—
Fixed/Adj
—
Single
√
MAX6768
Push-pull
—
Fixed/Adj
—
Single
√
MAX6769
Open drain
—
Fixed/Adj
√
Single
—
MAX6770
Push-pull
—
Fixed/Adj
√
Single
—
MAX6771
Open drain
—
Fixed/Adj
—
Dual
—
MAX6772
Push-pull
—
Fixed/Adj
—
Dual
—
MAX6773
Open drain
1.6s
Fixed/Adj
—
Single
—
MAX6773B
Open drain
50ms
Fixed/Adj
—
Single
—
MAX6774
Push-pull
1.6s
Fixed/Adj
—
Single
—
MAX6774B
Push-pull
50ms
Fixed/Adj
—
Single
—
Typical Application Circuit
OUT
IN
MAX6766
VCC
TIMEOUT
12V
BATTERY
TXD
GND
µC
ENABLE
RESET
XCVR
LIN
RXD
RESET
I/O
______________________________________________________________________________________
19
MAX6765–MAX6774
Selector Guide
Automotive Micropower Linear Regulators
with Supervisor
TIMEOUT
SET
RESET
OUT
TIMEOUT
SET
RESET
TOP VIEW
OUT
TOP VIEW
8
7
6
5
8
7
6
5
MAX6767
MAX6768
MAX6769
MAX6770
3
4
1
2
ENABLE
HOLD
IN
GND
TDFN
TDFN
TIMEOUT
SET
RESET
OUT
TIMEOUT
SET
RESET
TOP VIEW
8
7
6
5
8
7
6
5
MAX6773
MAX6773B
MAX6774
MAX6774B
MAX6771
MAX6772
2
3
4
1
2
3
4
GND
ENABLE1
ENABLE2
IN
GND
ENABLE
WDI
+
1
IN
+
TDFN
20
4
OUT
TOP VIEW
3
RESETIN
2
GND
+
1
IN
+
ENABLE
MAX6765–MAX6774
Pin Configurations (continued)
TDFN
______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
TEMP
RANGE
PINPACKAGE
PKG
CODE
MAX6767TA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6768TA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6769TA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6770TA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6771TA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6772TA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6773TA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6773BTA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6774TA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
MAX6774BTA_D_+
-40°C to +125°C
8 TDFN-EP*
T833-2
PART
PROCESS: BiCMOS
The first “_” is a placeholder for the voltage output and reset
threshold. The 2nd “_” designates the fixed reset-timeout option.
See Tables 1 and 2 for details. For example, the MAX6765TTLD4
has a 5V output, a reset threshold of 4.65V, and a 200ms typical
reset timeout.
+Denotes lead-free package.
*EP = Exposed paddle.
For tape-and-reel orders add a “T” after the “+” symbol to complete the part number. Tape-and-reel orders are available in
2.5k increments. Nonstandard versions require a 10k minimum
order quantity.
______________________________________________________________________________________
21
MAX6765–MAX6774
Chip Information
Ordering Information (continued)
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
6, 8, &10L, DFN THIN.EPS
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
22
______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
COMMON DIMENSIONS
PACKAGE VARIATIONS
SYMBOL
MIN.
MAX.
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
A
0.70
0.80
T633-2
6
1.50±0.10
2.30±0.10
0.95 BSC
MO229 / WEEA
0.40±0.05
1.90 REF
D
2.90
3.10
T833-2
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
E
2.90
3.10
T833-3
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
A1
0.00
0.05
T1033-1
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
L
0.20
0.40
T1033-2
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
k
0.25 MIN.
T1433-1
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
A2
0.20 REF.
T1433-2
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
Revision History
Pages changed at Rev 1: 1, 21, 23
Pages changed at Rev 2: 1, 4, 8, 9, 14, 16, 18–23
Pages changed at Rev 3: 1, 7, 23
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 23
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
MAX6765–MAX6774
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
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