MAX8875 - EXCELLENT INTEGRATED SYSTEM LIMITED
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
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MAX8875EUK27+T
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Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
19-1556; Rev 1; 12/00
150mA, Low-Dropout Linear Regulator
with Power-OK Output
The MAX8875 low-dropout linear regulator operates from
a +2.5V to +6.5V input range and delivers up to 150mA.
A P-channel MOSFET pass transistor allows its 85µA supply current to remain independent of the load, making this
device ideal for battery-operated portable equipment
such as PCS phones, cellular phones, cordless phones,
and modems.
The MAX8875 features a power-OK (POK) output that indicates when the output is out of regulation. The device is
available in several preset output voltage versions: 5.0V,
3.3V, 3.0V, 2.7V, 2.5V, or 1.5V. Other features include 1µA
(max) shutdown current, short-circuit protection, thermal
shutdown protection, and reverse-battery protection. The
device comes in a miniature 5-pin SOT23 package.
The MAX8875 is optimized for use with a 1µF ceramic output capacitor. For a pin-compatible, functionally equivalent
device for use with a higher ESR output capacitor, see the
MAX8885 data sheet.
Features
♦ Power-OK Output
♦ Small Output Capacitor (1µF ceramic)
♦ Preset Output Voltages (±1% accuracy)
♦ Guaranteed 150mA Output Current
♦ 85µA No-Load Supply Current
♦ Low 110mV Dropout at 100mA Load (165mV at
150mA load)
♦ Thermal-Overload and Short-Circuit Protection
♦ Reverse-Battery Protection
♦ 60dB PSRR at 100Hz
♦ 1µA max Shutdown Current
Ordering Information
PART*
TEMP. RANGE
PIN-PACKAGE
MAX8875EUKxy-T
-40°C to +85°C
5 SOT23-5
*xy is the output voltage code (see Output Voltage Selector
Guide).
Applications
Output Voltage Selector Guide
PCS Telephones
Hand-Held Instruments
VOUT (V)
TOP MARK
Cellular Telephones
Palmtop Computers
MAX8875EUK15-T
1.5
ADQI
Cordless Telephones
Electronic Planners
MAX8875EUK25-T
2.5
ADKZ
Modems
MAX8875EUK27-T
MAX8875EUK30-T
MAX8875EUK33-T
2.7
3.0
3.3
ADLA
ADLB
ADLC
MAX8875EUK50-T
5.0
ADLD
PCMCIA Cards
Typical Operating Circuit
Note: Other output voltages between 1.5V and 5.0V are available in 100mV increments—contact the factory for information.
Minimum order quantity is 25,000 units.
OUTPUT
PRESET
1.5V TO 5.0V
150mA
INPUT
+2.5V TO +6.5V
IN
PART
OUT
COUT
1µF
CIN
1µF
Pin Configuration
TOP VIEW
IN 1
5
OUT
4
POK
MAX8875
100k
GND 2
ON
OFF
POK
SHDN
GND
MAX8875
TO µC
SHDN 3
SOT23-5
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX8875
General Description
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
MAX8875
150mA, Low-Dropout Linear Regulator
with Power-OK Output
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, POK to GND...............................................-7V to +7V
SHDN to IN ...............................................................-7V to +0.3V
OUT to GND ................................................-0.3V to (VIN + 0.3V)
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)..........571mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
θJA ...............................................................................+140°C/W
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 = VOUT(NOMINAL) + 1V, SHDN = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Input Voltage
SYMBOL
CONDITIONS
MAX
UNITS
2.5
6.5
V
-1.0
1.0
IOUT = 100µA
-2
2
IOUT = 100µA to
120mA
-3
2
VIN
TA = +25°C, IOUT = 100µA
Output Voltage Accuracy
TA = -40°C to +85°C
MIN
Maximum Output Current
IOUT
150
Current Limit
ILIM
160
Ground Pin Current
Dropout Voltage (Note 2)
IQ
VIN - VOUT
TYP
%
mA
390
IOUT = 100µA
85
IOUT = 150mA
100
IOUT = 100µA
0.1
IOUT = 50mA
50
IOUT = 100mA
110
mA
180
220
µA
mV
165
IOUT = 150mA
Line Regulation
∆VLNR
VIN = 2.5V or (VOUT + 0.1V) to 6.5V, IOUT = 1mA
Load Regulation
∆VLDR
IOUT = 100µA to 120mA, COUT = 1µF
0.01
%/mA
COUT = 10µF, f = 10Hz to 100kHz
170
µVRMS
f = 100Hz
60
dB
Output Voltage Noise
Output Voltage AC PowerSupply Rejection Ratio
PSRR
-0.15
0
0.15
%/V
SHUTDOWN
Shutdown Supply Current
SHDN Input Threshold
SHDN Input Bias Current
2
IOFF
VIH
VIL
ISHDN
SHDN = GND
TA = +25°C
0.005
TA = +85°C
0.02
2.0
VIN = 2.5V to 5.5V
SHDN = IN or GND
1
0.4
TA = +25°C
0
TA = +85°C
0.05
_______________________________________________________________________________________
100
µA
V
nA
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
150mA, Low-Dropout Linear Regulator
with Power-OK Output
(VIN = VOUT(NOMINAL) + 1V, SHDN = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
-3
-5
-8
TA = 0°C to +85°C
-8.5
-10.5
-13.5
TA = -40°C to +85°C
-7
UNITS
POWER-OK OUTPUT
1 - VOUT / VOUT(NOMINAL) 100, IOUT = 0,
VOUT falling, VOUT ≥ 2.5V
Power-OK Voltage Threshold
VPOK
1 - VOUT /VOUT(NOMINAL)
100, IOUT = ILIM,
VOUT falling,
VOUT < 2.5V
%
In dropout, VOUT falling, VOUT ≥ 2.5V
-5.3
1
Hysteresis, IOUT = 0
POK Output Voltage Low
VOL
-15
ISINK = 1mA
0 ≤ VPOK ≤ 6.5V, VOUT in regulation
POK Output Leakage Current
0.4
V
1
µA
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TSHDN
170
°C
∆TSHDN
20
°C
Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed through
correlation using Statistical Quality Control (SQC) methods.
Note 2: Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V. Applies only
for output voltages ≥ 2.5V.
Typical Operating Characteristics
(MAX8875EUK30, VIN = +3.6V, CIN = COUT = 1µF, SHDN = IN, TA = +25°C, unless otherwise noted.)
GROUND PIN CURRENT vs.
OUTPUT LOAD
GROUND PIN CURRENT (µA)
80
IOUT = 0
60
40
110
VIN = 5.0V
105
100
VIN = 3.5V
95
90
20
0
1
2
3
4
INPUT VOLTAGE (V)
5
6
VIN = VOUT(NOMINAL) + 0.5V
115
VOUT = 5.0V
MAX8875EUK50
110
105
100
VOUT = 3.0V
MAX8875EUK30
95
90
85
0
120
MAX8875toc03
100
115
MAX8875toc02
IOUT = 150mA
GROUND PIN CURRENT (µA)
MAX8875toc01
120
GROUND PIN CURRENT vs.
OUTPUT LOAD
GROUND PIN CURRENT (µA)
GROUND PIN CURRENT vs.
INPUT VOLTAGE
85
0
15 30 45 60 75 90 105 120 135 150
OUTPUT LOAD (mA)
0
15 30 45 60 75 90 105 120 135 150
OUTPUT LOAD (mA)
_______________________________________________________________________________________
3
MAX8875
ELECTRICAL CHARACTERISTICS (continued)
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
Typical Operating Characteristics (continued)
(MAX8875EUK30, VIN = +3.6V, CIN = COUT = 1µF, SHDN = IN, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE vs.
INPUT VOLTAGE
VIN = 3.6V
IOUT = 150mA
90
VIN = 3.6V OR 5.0V
IOUT = 0
80
2.5
2.0
IOUT = 150mA
1.5
1.0
3.05
3.00
VIN = 3.6V
2.95
VIN = 5.0V
0.5
70
2.90
0
60
-40
-15
10
35
60
0
85
1
2
3
4
5
0
6
15
30 45 60 75 90 105 120 135 150
TEMPERATURE (°C)
INPUT VOLTAGE (V)
OUTPUT LOAD (mA)
OUTPUT VOLTAGE vs. TEMPERATURE
DROPOUT VOLTAGE vs.
OUTPUT LOAD
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
3.00
VIN = 3.6V
IOUT = 150mA
2.95
2.90
COUT = 10µF
TA = +85°C
TA = +25°C
100
-15
10
35
60
40
30
COUT = 1µF
20
TA = -40°C
10
0
85
0
15
0
0.01
30 45 60 75 90 105 120 135 150
0.1
1
10
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
OUTPUT NOISE
LINE-TRANSIENT RESPONSE
f = 10Hz TO 100kHz
COUT = 10µF
IOUT = 50mA
VIN
MAX8875toc10
COUT = 10µF
IOUT = 50mA
5V
4V
1
VOUT
500µV/div
3.02V
VOUT
0.1
3.00V
2.98V
0.01
1
10
FREQUENCY (kHz)
4
100
1000
MAX8875toc13
OUTPUT LOAD (mA)
10
0.1
100
TEMPERATURE (°C)
MAX8875toc11
-40
60
50
150
50
VIN = 5.0V
IOUT = 150mA
MAX8875toc09
200
PSRR (dB)
DROPOUT VOLTAGE (mV)
VIN = 3.6V OR 5.0V
IOUT = 0
3.05
70
MAX8875toc08
250
MAX8875toc07
3.10
OUTPUT VOLTAGE (V)
IOUT = 0
OUTPUT VOLTAGE (V)
110
100
3.0
3.10
MAX8875toc05
VIN = 5.0V
IOUT = 150mA
OUTPUT VOLTAGE (V)
GROUND PIN CURRENT (µA)
120
OUTPUT VOLTAGE vs. OUTPUT LOAD
3.5
MAX8875toc04
130
MAX8875toc06
GROUND PIN CURRENT vs.
TEMPERATURE
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
MAX8875
150mA, Low-Dropout Linear Regulator
with Power-OK Output
10ms/div
10µs/div
IOUT = 50mA
_______________________________________________________________________________________
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
150mA, Low-Dropout Linear Regulator
with Power-OK Output
(MAX8875EUK30, VIN = +3.6V, CIN = COUT = 1µF, SHDN = IN, TA = +25°C, unless otherwise noted.)
MAX8875toc14
3.01V
VOUT
3.00V
3.00V
2.99V
50mA
50mA
ILOAD
2.99V
ILOAD
0
0
10µs/div
10µs/div
VIN = VOUT + 0.5V, IOUT = 0 TO 50mA
VIN = VOUT + 0.1V, IOUT = 0 TO 50mA
SHUTDOWN DELAY
3V
MAX8875toc17
MAX8875toc16
POK OUTPUT
VOUT
1V/div
0
0
2V
VOUT
2V/div
VPOK
2V/div
0
4V
VSHDN
1V/div
0
VIN
1V/div
3V
2V
100µs/div
200µs/div
MAX8875EUK30, ROUT = 60Ω
RPOK = 100kΩ
POK STARTUP RESPONSE
POK AND SHUTDOWN RESPONSE
MAX8875toc18
5.0V
VIN
2.5V/div
2V
VOUT
2.5V/div
2V
0
MAX8875toc19
VOUT
3.01V
MAX8875toc15
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
LOAD-TRANSIENT RESPONSE
VSHDN
2V/div
0
2.5V
0
VOUT
2V/div
0
4V
5.0V
VPOK
2V/div
VPOK
2.5V/div
0
0
RLOAD = 60Ω
10ms/div
RPOK = 100kΩ
10µs/div
RPOK = 100kΩ
_______________________________________________________________________________________
5
MAX8875
Typical Operating Characteristics (continued)
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
150mA, Low-Dropout Linear Regulator
with Power-OK Output
MAX8875
Pin Description
PIN
NAME
FUNCTION
1
IN
2
GND
Ground. This pin also functions as a heatsink. Solder to a large pad or the circuit-board ground plane to
maximize power dissipation.
3
SHDN
Active-Low Shutdown Input. A logic low reduces the supply current to below 1µA. Connect to IN for normal
operation.
4
POK
Power-OK Output. Active-low, open-drain output indicates an out-of-regulation condition. Connect a 100k
pull-up resistor to OUT for logic levels. If not used, leave this pin unconnected.
5
OUT
Regulator Output. Fixed 5.0V, 3.3V, 3.0V, 2.7V, 2.5V, or 1.5V output. Sources up to 150mA. Bypass with 1µF
(<0.2Ω typical ESR) ceramic capacitor to GND for VOUT ≥ 2.5V. Bypass with 3.3µF (<0.2Ω typ ESR) ceramic
capacitor to GND for VOUT = 1.5V.
Regulator Input. Supply voltage can range from 2.5V to 6.5V. Bypass with 1µF to GND (see the Capacitor
Selection and Regulator Stability section).
IN
SHDN
REVERSEBATTERY
PROTECTION
MOS DRIVER
WITH ILIMIT
ERROR
AMP
SHUTDOWN
LOGIC
P
OUT
MAX8875
POK
THERMAL
SENSOR
1.25V
REF
95%
REF
POK
GND
Figure 1. Functional Diagram
_______________Detailed Description
The MAX8875 is a low-dropout, low-quiescent-current
linear regulator designed primarily for battery-powered
applications. The device supplies loads up to 150mA
and is available with preset output voltages of 1.5V,
2.5V, 2.7V, 3.0V, 3.3V, or 5.0V. As illustrated in Figure
1, the MAX8875 consists of a 1.25V reference, error
amplifier, P-channel pass transistor, power-OK comparator, and internal feedback voltage divider.
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
6
this reference with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than the
reference voltage, the pass-transistor gate is pulled
lower, which allows more current to pass to the output
and increases the output voltage. If the feedback voltage is too high, the pass-transistor gate is pulled up,
allowing less current to pass to the output. The output
voltage feeds back through an internal resistor voltage
divider connected to the OUT pin.
Additional blocks include a current limiter, reversebattery protection, thermal sensor, and shutdown logic.
_______________________________________________________________________________________
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
150mA, Low-Dropout Linear Regulator
with Power-OK Output
Internal P-Channel Pass Transistor
The MAX8875 features a 1.1Ω (typ) P-channel MOSFET
pass transistor. This provides several advantages over
similar designs using PNP pass transistors, including
longer battery life. The P-channel MOSFET requires no
base drive, which reduces quiescent current significantly. PNP-based regulators waste considerable
current in dropout when the pass transistor saturates.
They also use high base-drive currents under large
loads. The MAX8875 does not suffer from these problems and consumes only 100µA of quiescent current
whether in dropout, light-load, or heavy-load applications (see Typical Operating Characteristics).
Power-OK Output (POK)
When the output voltage goes out of regulation—as during dropout, current limit, or thermal shutdown—POK
goes low. POK is an open-drain N-channel MOSFET. To
obtain a logic-level output, connect a pull-up resistor
from POK to OUT. To minimize current consumption,
make this resistor as large as practical. A 100kΩ resistor
works well for most applications. A capacitor to GND
may be added to generate a power-on-reset (POR)
delay. The POK function is not active during shutdown.
POK also provides a power-on-reset function that can
operate down to VIN ≤ 1V. See POK Startup Response
in the Typical Operating Characteristics.
Current Limit
The MAX8875 includes a current limiter that monitors
and controls the pass transistor’s gate voltage, limiting
the output current to 390mA (typ). For design purposes, consider the current limit to be 160mA min to
600mA max. The output can be shorted to ground for
an indefinite period of time without damaging the part.
Thermal-Overload Protection
When the junction temperature exceeds TJ = +170°C,
the thermal sensor signals the shutdown logic, turning
off the pass transistor and allowing the IC to cool. The
thermal sensor will turn the pass transistor on again after
the IC’s junction temperature cools by 20°C, resulting in
a pulsed output during continuous thermal-overload
conditions.Thermal-overload protection is designed to
protect the MAX8875 in the event of fault conditions. For
continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ = +150°C.
Operating Region and Power Dissipation
The MAX8875’s maximum power dissipation depends
on the thermal resistance of the case and circuit board,
the temperature difference between the die junction
and ambient air, and the rate of air flow. The power dissipation across the device is P = IOUT (VIN - VOUT). The
maximum power dissipation is:
PMAX = (TJ - TA) / (θJB + θBA)
where TJ - TA is the temperature difference between
the MAX8875 die junction and the surrounding air, θJB
(or θJC) is the thermal resistance of the package, and
θBA is the thermal resistance through the printed circuit
board, copper traces, and other materials to the surrounding air.
The MAX8875’s ground pin (GND) performs the dual
function of providing an electrical connection to system
ground and channeling heat away. Connect GND to the
system ground using a large pad or ground plane.
Reverse-Battery Protection
The MAX8875 has a unique protection scheme that limits the reverse supply current to 1mA when either VIN or
V SHDN falls below ground. The circuitry monitors the
polarity of these two pins and disconnects the internal
circuitry and parasitic diodes when the battery is
reversed. This feature prevents device damage.
__________Applications Information
Capacitor Selection and
Regulator Stability
For stable operation over the full temperature range
and with load currents up to 150mA, use a 1µF (min)
ceramic output capacitor with an ESR <0.2Ω for VOUT
≥ 2.5V, or an equivalent 3.3µF ceramic output capacitor
for VOUT = 1.5V. To reduce noise and improve loadtransient response, stability, and power-supply rejection, use large output capacitor values, such as 10µF.
Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it may be necessary
to increase the capacitance by a factor of 2 or more to
ensure stability at temperatures below TA = -10°C. With
X7R or X5R dielectrics, 1µF should be sufficient at all
operating temperatures for VOUT ≥ 2.5V. For a pin-compatible, functionally equivalent device for use with a
higher ESR output capacitor, see the MAX8885.
_______________________________________________________________________________________
7
MAX8875
Output Voltage
The MAX8875 is supplied with factory-set output voltages of 1.5V, 2.5V, 2.7V, 3.0V, 3.3V, or 5.0V. The part
number’s two-digit suffix identifies the nominal output
voltage. For example, the MAX8875EUK33 has a preset
output voltage of 3.3V (see Output Voltage Selector
Guide).
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
MAX8875
150mA, Low-Dropout Linear Regulator
with Power-OK Output
PSRR and Operation from
Sources Other than Batteries
The MAX8875 is designed to deliver low dropout voltages
and low quiescent currents in battery-powered systems.
Power-supply rejection is 60dB at low frequencies. See
the Power-Supply Rejection Ratio vs. Frequency graph in
the Typical Operating Characteristics.
Improve supply-noise rejection and transient response
by increasing the values of the input and output bypass
capacitors. The Typical Operating Characteristics show
the MAX8875’s line- and load-transient responses.
Dropout Voltage
For versions with the output voltage greater than the
minimum input voltage (2.5V), the regulator’s minimum
input-output voltage differential (or dropout voltage)
determines the lowest usable supply voltage. In batterypowered systems, this will determine the useful end-oflife battery voltage. Because the MAX8875 uses a
P-channel MOSFET pass transistor, its dropout voltage
is a function of drain-to-source on-resistance (RDS(ON))
multiplied by the load current (see Typical Operating
Characteristics):
VDROPOUT = VIN - VOUT = RDS(ON) ✕ IOUT
Chip Information
TRANSISTOR COUNT: 266
8
_______________________________________________________________________________________
Distributor of Maxim Integrated: Excellent Integrated System Limited
Datasheet of MAX8875EUK27+T - IC REG LDO 2.7V 0.15A SOT23-5
Contact us: [email protected] Website: www.integrated-circuit.com
150mA, Low-Dropout Linear Regulator
with Power-OK Output
SOT5L.EPS
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.
9 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
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MAX8875
Package Information
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