null  null
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
General Description
The MAX16999 linear regulator operates from a 2.5V to
5.5V input voltage and delivers 100mA continuous load
current with a low quiescent current typically around
13μA. The output voltage is preset to internally trimmed
voltages in the 0.5V to 3.3V range (see the Selector
Guide). An active-low, open-drain reset output remains
low for a programmable timeout delay after the output
voltage reaches regulation. The reset timeout is programmed by an external capacitor connected to CRES.
This device also features logic-controlled shutdown, and
short-circuit and thermal-overload protection. The typical
applications are multimedia, telematics, and motor control
microcontrollers (μCs) with always-on requirements. The
MAX16999 is used as a parallel, lowquiescent supply to
power the core or interrupt section of μCs during sleep
mode. It can also be used to supply a timer or memory
during μC shutoff. The adjustable POR delay assists with
power-supply sequencing.
Applications
●●
●●
●●
●●
CIN
1µF
ON
OUT
MAX16999
EN
CRES
OFF
RESET
EP
GND
●● Up to 100mA Output Current at TA = +125°C
●● 13μA Quiescent Current
●● Logic-Controlled Enable
●● Adjustable POR Delay Flag
●● Short to GND Protection on Reset Timer
●● Used in Parallel with High-Current Supply of Equal
Voltages
●● Thermal-Overload and Short-Circuit Protection
●● Tiny 8-Pin μMAX® Package with Exposed Pad
Ordering Information
PART*
TEMP RANGE
PIN-PACKAGE
MAX16999AUA_ _+
-40°C to +125°C
8 µMAX-EP**
+Denotes a lead(Pb)-free/RoHS-compliant package.
**EP = Exposed pad.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
IN
●● Preset 0.5V to 3.3V Output Voltage Range
*Insert the desired two-digit suffix (see the Selector Guide) into
the blanks to complete the part number. Contact the factory for
other output voltages or other package options.
Industrial
SDRAM Power Supplies
Keep-Alive Timers
Handheld/Portable Devices
INPUT
2.5V TO 5.5V
Features
Pin Configuration
OUTPUT
0.5V TO 3.3V
COUT
4.7µF
LOGIC
SUPPLY
CCRES
15nF
TOP VIEW
OUT
1 +
8
IN
OUT
2
7
IN
CRES
3
6
EN
RESET
4
5
GND
MAX16999
*
µMAX
TO CONTROLLER
*EXPOSED PAD
μMAX is a registered trademark of Maxim Integrated Products,
Inc.
19-4114; Rev 2; 2/15
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Absolute Maximum Ratings
IN, RESET to GND................................................-0.3V to +6.0V
OUT, CRES, EN to GND.............................-0.3V to (VIN + 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA = +70°C) (Note 1)
(derate 10.3mW/°C above +70°C)
μMAX (single-layer PCB)..........................................824.7mW
(derate 12.9mW/°C above +70°C)
μMAX (multilayer PCB)...........................................1030.9mW
Package Junction-to-Case Thermal Resistance (θJC)....4.8°C/W
Package Junction-to-Ambient Thermal Resistance (θJA)
(single-layer PCB)........................................................97°C/W
Package Junction-to-Ambient Thermal Resistance (θJA)
(multilayer PCB)........................................................77.6°C/W
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -60°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
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.
DC Electrical Characteristics
(For devices with VOUT ≤ 1.5V, VIN = 3.3V. For devices with VOUT > 1.5V, VIN = 5V. EN = IN, TJ = -40°C to +125°C, CIN = 1μF, COUT
= 4.7μF, CCRES = 1000pF, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
IN Operating Voltage
IN Undervoltage-Lockout (UVLO)
Threshold
SYMBOL
CONDITIONS
VIN
VUVLO
MIN
2.5
VIN rising
1.94
IN UVLO Hysteresis
VIN = VOUT + 2V
ILIM
Ground Current
IQ
Dropout Voltage
VIN - VOUT
Load Regulation
Line Regulation
Power-Supply Rejection Ratio
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MAX
UNITS
5.5
V
2.2
V
45
Output-Voltage Accuracy
Current Limit
TYP
VOUT ≤ 1.5V,
IOUT = 1mA to 80mA
-2.5
+2.5
VOUT > 1.5V,
IOUT = 1mA to 100mA
-2.5
+2.5
OUT = GND
PSRR
%
105
150
IOUT = 100µA
13
IOUT = 100mA
23
IOUT = 80mA, VOUT = 3.3V (Note 3)
ΔVOUT/ΔIOUT IOUT = 1mA to 80mA
ΔVOUT/ΔVIN
IOUT = 80mA
IOUT = 10mA,
500mVP-P, VIN VOUT > 1.5V
mV
mA
20
0.035
0.1
VOUT < 1V,
2.5V < VIN < 5.5V
0.4
VOUT ≥ 1V, (VOUT +
1.5V) < VIN < 5.5V
1.8
f = 100Hz
70
f = 100kHz
40
0.1
µA
V
mV/mA
mV/V
dB
Maxim Integrated │ 2
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
DC Electrical Characteristics (continued)
(For devices with VOUT ≤ 1.5V, VIN = 3.3V. For devices with VOUT > 1.5V, VIN = 5V. EN = IN, TJ = -40°C to +125°C, CIN = 1μF, COUT
= 4.7μF, CCRES = 1000pF, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
0.3
1
µA
EN
Standby Current
ISTB
Turn-On Delay
EN = GND
From EN = high to VOUT = 100mV
10
µs
ENH
Circuit active
ENL
Circuit inactive
Pullup Resistance
REN-H
VEN = 75% VIN
120
kΩ
Pulldown Resistance
REN-L
VEN = 25% VIN
120
kΩ
Threshold Accuracy
VRES
VOUT falling
Logic Levels
RESET
Threshold Hysteresis
RESET Timeout
Output Deglitch Time
30
79.5
VRES,HYST
RESET Open-Drain Leakage
Output Low Voltage
70
82.5
85.5
2.5
%VIN
%VOUT
%VOUT
RESET = high impedance, VRESET = 5mV
200
nA
VRES,OL
ILOAD = 250µA
100
mV
tRSOFF
CRES = GND
80
ms
tDEGLITCH
VOUT < VRES
30
30
µs
CRES
Charge Current
ICRES,UP
8
Discharge Current
ICRES,DN
1
Threshold
VCRES,THRS
RESET goes from low to high impedance
575
10
12
µA
mA
600
625
mV
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TSHDN
+165
°C
ΔTSHDN
15
°C
Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 3: Dropout voltage is defined as VIN - VOUT when VOUT is 2% below its value for VIN = VOUT + 2V.
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Maxim Integrated │ 3
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Typical Operating Characteristics
(For devices with VOUT < 1.5V, VIN = 3.3V. For devices with VOUT > 1.5V, VIN = 5V. EN = IN, CIN = 1μF, COUT = 4.7μF, CCRES = 1000pF,
TA = + 25°C, unless otherwise noted.)
0.2
0.1
VOUT = 1V
0
VOUT = 0.5V
-0.1
-0.2
-0.3
40
60
80
0.998
0.997
100
0.994
4.5
5.0
IOUT = 100mA
-0.2
IOUT = 50mA
-0.3
-0.4
-0.5
5.5
VOUT = 1V
VOUT = 0.5V
0
-50
35
IOUT = 100mA
30
IOUT = 50mA
25
20
15
10
IOUT = 0.1mA
5
20
50
100
60
80
100
0
1
2
3
4
5
MAX16999 toc06
25
20
15
10
IOUT = 0.1mA
IOUT = 1mA
5
0
6
IOUT = 100mA
IOUT = 50mA
VOUT = 1V
-25
-50
0
25
50
75
100 125 150
TEMPERATURE (°C)
CURRENT LIMIT
vs. INPUT VOLTAGE
DROPOUT VOLTAGE
vs. LOAD CURRENT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
150
145
140
135
3.5
4.0
4.5
INPUT VOLTAGE (V)
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5.0
5.5
80
80
70
60
70
60
PSRR (dB)
155
VOUT = 3.3V
90
DROPOUT VOLTAGE (mA)
160
100
50
40
30
MAX16999 toc09
INPUT VOLTAGE (V)
165
3.0
0
IOUT = 1mA
150
LOAD CURRENT (mA)
MAX16999 toc07
170
40
MAX16999 toc05
40
30
MAX16999 toc08
10
VOUT = 0.5V
45
GROUND-PIN CURRENT (µA)
15
50
MAX16999 toc03
0
-0.1
GROUND-PIN CURRENT
vs. TEMPERATURE
20
2.5
4.0
0.1
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
VOUT = 3.3V
0
3.5
IOUT = 0.1mA
0.2
GROUND-PIN CURRENT
vs. LOAD CURRENT
5
CURRENT LIMIT (mA)
3.0
IOUT = 1mA
0.3
TEMPERATURE (°C)
25
130
2.5
IOUT = 100mA
VOUT = 1V
INPUT VOLTAGE (V)
30
0
IOUT = 50mA
0.4
OUTPUT-VOLTAGE ACCURACY
vs. TEMPERATURE
LOAD CURRENT (mA)
35
GROUND-PIN CURRENT (µA)
0.999
0.995
MAX16999 toc04
40
20
IOUT = 1mA
1.000
GROUND-PIN CURRENT (µA)
0
IOUT = 0.1mA
1.001
0.996
VOUT = 3.3V
-0.4
1.002
0.5
OUTPUT-VOLTAGE ACCURACY (%)
0.3
1.003
OUTPUT VOLTAGE (V)
0.4
-0.5
1.004
MAX16999 toc01
OUTPUT-VOLTAGE ACCURACY (%)
0.5
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX16999 toc02
OUTPUT-VOLTAGE ACCURACY
vs. LOAD CURRENT
50
40
30
20
20
10
10
0
0
0
25
50
75
100
LOAD CURRENT (mA)
125
150
VOUT = 0.5V, IOUT = 10mA
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
Maxim Integrated │ 4
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Typical Operating Characteristics (continued)
(For devices with VOUT < 1.5V, VIN = 3.3V. For devices with VOUT > 1.5V, VIN = 5V. EN = IN, CIN = 1μF, COUT = 4.7μF, CCRES = 1000pF,
TA = + 25°C, unless otherwise noted.)
LINE-TRANSIENT RESPONSE NEAR
DROPOUT
LINE-TRANSIENT RESPONSE
MAX16999 toc10
MAX16999 toc11
4V
VIN
1.6V
3.5V
VIN
100mV/div
AC-COUPLED
VOUT
0.6V
200mV/div
AC-COUPLED
VOUT
VOUT = 0.5V
VOUT = 0.5V
200µs/div
200µs/div
LOAD-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE NEAR
DROPOUT
MAX16999 toc13
MAX16999 toc12
50mA/div
IOUT
0
100mV/div
AC-COUPLED
VOUT
50mA/div
IOUT
0
100mV/div
AC-COUPLED
VOUT
VOUT = 3.3V, VIN = VOUT + 50mV
VOUT = 3.3V
200µs/div
200µs/div
SHUTDOWN RESPONSE
RESET/ENABLE RESPONSE
MAX16999 toc14
MAX16999 toc15
5V
VEN
0
5V
VEN
0
VOUT
1V
0
1V
VOUT
VOUT = 1V, IOUT = 50mA
100µs/div
www.maximintegrated.com
0
5V
VRESET
VOUT = 1V, IOUT = 50mA, CCRES = 15,000pF
0
400µs/div
Maxim Integrated │ 5
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Typical Operating Characteristics (continued)
(For devices with VOUT < 1.5V, VIN = 3.3V. For devices with VOUT > 1.5V, VIN = 5V. EN = IN, CIN = 1μF, COUT = 4.7μF, CCRES = 1000pF,
TA = + 25°C, unless otherwise noted.)
MAX16999 toc16
2V/div
0
VOUT
500mV/div
0
VRESET
5V
16
14
12
10
8
6
4
0
VOUT = 0.5V, IOUT = 50mA, CCRES = 15,000pF
2
0
2ms/div
-25
0
25
50
75
100 125 150
SHORT-CIRCUIT RESPONSE
MAX16999 toc19
MAX16999 toc18
25
RESET TIMEOUT (ms)
-50
TEMPERATURE (°C)
RESET TIMEOUT
vs. CRES CAPACITANCE
30
VOUT = 1V, CCRES = 15,000pF
18
CRES PULLUP CURRENT (µA)
VIN
20
MAX16999 toc17
CRES PULLUP CURRENT
vs. TEMPERATURE
LINE/RESET RESPONSE
VOUT
5V
0
VRESET
5V
20
15
0
10
5A
5
0
IOUT
0
100
200
300
400
500
VOUT = 3.3V
0
200µs/div
CRES CAPACITANCE (nF)
Pin Description
PIN
NAME
1, 2
OUT
3
CRES
4
RESET
5
GND
6
EN
7, 8
IN
—
EP
FUNCTION
Regulator Output. Bypass OUT to GND with a 4.7µF ceramic capacitor. OUT becomes high impedance when
EN is low.
POR Timer. Bypass CRES to GND with a ceramic capacitor to define POR timing (see the POR Timer section).
Open-Drain, Active-Low Reset Output. RESET is high impedance when output is in regulation or if the IC is in
shutdown. RESET is pulled low when VOUT drops below 82.5% (typ) of its nominal voltage.
Ground. Connect GND to a large circuit board ground plane and directly to the exposed paddle.
Active-High Enable Input. Drive EN low to place the regulator in standby mode. Drive EN high or connect to IN
for normal operation.
Regulator Input. Bypass IN to GND with at least a 1µF ceramic capacitor.
Exposed Paddle. Connect EP to a large pad or circuit board ground plane to maximize power dissipation. EP
serves as a heatsink.
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Maxim Integrated │ 6
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
ERROR
AMPLIFIER
IN
VREF
MAX16999
POR
COMPARATOR
20µs
DEGLITCH
0.825 x VREF
OUT
GND
ICRES,UP
(10µA)
EP
CRES
ICRES,DOWN
(10mA)
EN
100kΩ
CRES
COMPARATOR
LOGIC
CONTROL
VCRES,THRS
RESET
COUNTER
(100ms)
Figure 1. Block Diagram
www.maximintegrated.com
Maxim Integrated │ 7
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Detailed Description
The MAX16999 is a low-quiescent-current linear regulator designed for applications requiring high reliability. This
device can supply loads up to 100mA and is available in
factory-preset output voltages from 0.5V to 3.3V (see the
Selector Guide). As illustrated in Figure 1, the MAX16999
linear regulator consists of a reference, an error amplifier,
a p-channel MOSFET pass transistor, and an internal
feedback voltage-divider. A power-on reset section signals
if the output voltage has come out of regulation. The reset
signal timeout is defined by the charging time of an external capacitor attached to CRES.
To increase system reliability, the MAX16999 features a
POR reset timeout along with overcurrent and overtemperature protection. A power-on reset timeout guarantees
startup even with a faulty timing capacitor. Parameters
are guaranteed up to +125°C junction temperature. The
EN signal is latched in its last state even if the signal line
becomes disconnected.
Logic-Controlled Enable
The MAX16999 provides a logic-enable input (EN). For
normal operation drive EN to logic-high. When EN is driven high, the linear regulator starts to regulate by increasing the output voltage up to the preset value. To disable
the device, drive EN low to set OUT to high impedance—
this enables a pulldown current from CRES to discharge
the capacitor. Once the device is disabled, the input supply current reduces to less than 0.3μA. The EN input is
latched into its last state by a 120kΩ internal resistor. To
change state, the latch needs to be overridden. When EN
is low, the RESET output is high impedance.
POR Timer
Once the output voltage rises above the threshold
VRES, two internal timers are simultaneously activated.
The reset timer is realized by means of a pullup current
ICRES,UP that charges the capacitor connected to CRES.
As soon as the voltage on CRES rises above the threshold
of 600mV (typ), RESET goes high impedance.
www.maximintegrated.com
The internal reset timer is set by the value of the external
capacitance (CCRES). Calculate the reset time using the
following formula:
t POR_DELAY = C CRES x 60 x 10
3
V
A
where CCRES is in Farads and the delay to GND is given
in seconds.
The second timer is an internal fault timer and ensures the
regulator does not stay off indefinitely because of a fault
on CRES such as a short. The fault timer runs for a maximum of 100ms. A logic block monitors both internal timers
to determine the shortest timeout. If the first timeout is the
fault timer, the pullup current is switched off in order to
avoid unnecessary current consumption and a resistive
pulldown is also activated. If tPOR_DELAY exceeds 100ms
(typ) the fault timer defines the timeout behavior.
Current Limit
Once the output voltage reaches regulation, the output
current is limited to 150mA (typ). If the output current
exceeds the current limit, the output voltage begins to
decrease.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation in the MAX16999. When the junction temperature
exceeds +165°C, a thermal sensor turns off the pass transistor, allowing the IC to cool. The thermal sensor turns
the pass transistor on again after the junction temperature
cools by 15°C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload
protection safeguards the MAX16999 in the event of fault
conditions. For continuous operation, do not exceed the
absolute maximum junctiontemperature rating of +150°C.
Table 1 lists maximum DC output currents (milliamps) that
are allowed for operation at TA = +125°C without causing
thermal shutdown of the MAX16999.
Maxim Integrated │ 8
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Table 1. Output Currents at TA = +125°C
SINGLE-LAYER BOARD
VOUT
(V)
MULTILAYER
BOARD
VIN = 3.3V
(mA)
VIN = 5V
(mA)
VIN = 5V
(mA)
0.5
92
57
72
0.6
95
59
73
0.7
99
60
75
0.8
100
61
77
0.9
100
63
79
1.0
100
64
81
1.1
100
66
83
1.2
100
68
85
1.5
100
74
92
1.8
100
81
100
2.5
100
100
100
3.3
100
100
100
Undervoltage Lockout (UVLO)
Before the MAX16999 can operate, the input voltage
must exceed the UVLO threshold of 2.2V (max) with a
30mV hysteresis. If the input voltage is below the UVLO
threshold, OUT becomes high impedance and EN is
ignored regardless if it is driven high or low.
Applications Information
Capacitor Selection
Capacitors are required at the MAX16999 input and output for stable operation over the full temperature range
and with load currents up to 100mA. Connect a 1μF
ceramic capacitor between IN and GND and a 4.7μF
ceramic capacitor between OUT and GND. The input
capacitor (CIN) lowers the source impedance of the input
supply. Use larger output capacitors to reduce noise and
improve stability and power-supply rejection. The output
capacitor’s equivalent series resistance (ESR) affects
stability and output noise. Use output capacitors with an
ESR of 30mΩ or less to ensure stability and optimize
transient response. Surface-mount ceramic capacitors
have very low ESR and are commonly available in values up to 10μF. Connect CIN and COUT as close to the
MAX16999 as possible to minimize the impact of the PCB
trace inductance.
Using MAX16999 in Parallel
with Another Supply
The MAX16999 can be used in parallel with another supply of equal voltage (see Figure 2). The circuit shows a
typical low-power solution for a μC.
4V TO 36V
3.3V, 1A LOW-IQ
INTERFACE SUPPLY
MAX1745
TO µC
1.2V, 3A
CORE SUPPLY
MAX8693
MAX16999
1.2V LOW-IQ
CORE BYPASS
Figure 2. Low-Quiescent μC Supply Solution
www.maximintegrated.com
Maxim Integrated │ 9
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Selector Guide
SUFFIX
Chip Information
VOUT (V)
TOP MARK
0.5
+AABE
06
0.6
+AABV
07
0.7
+AABW
08
0.8
+AABX
09
0.9
+AABQ
10*
1.0
+AABF
11
1.1
+AABY
12
1.2
+AABR
13
1.3
+AABZ
15
1.5
+AABS
18
1.8
+AABT
25
2.5
+AABU
33*
3.3
+AABG
05
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN
NO.
8 μMAX-EP
U8E+2
21-0107
90-0145
Note: Bold indicates a standard value. For other values,
contact factory for availability. Nonstandard options require a
5k minimum quantity order.
www.maximintegrated.com
Maxim Integrated │ 10
MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
4/08
Initial release
1
12/14
Removed reference to AEC-100 qualification in the Features section; removed
reference to automotive applications in the Detailed Description section
1, 8
2
2/15
Updated Top Marks in the Selector Guide
10
DESCRIPTION
—
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2015 Maxim Integrated Products, Inc. │ 11
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