MAX8885EUK50+T ,150mA, Low-Dropout Linear Regulator with Power OK OutputMAX888519-1576; Rev 0; 10/99150mA, Low-Dropout Linear Regulator with Power-OK Output
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MAX8885EUK25+-MAX8885EUK25+T-MAX8885EUK30+T-MAX8885EUK33+T-MAX8885EUK50+-MAX8885EUK50+T
150mA, Low-Dropout Linear Regulator with Power OK Output
General DescriptionThe MAX8885 low-dropout (LDO) linear regulator operates
from a +2.5V to +6.5V input voltage range and delivers up
to 150mA. It uses a P-channel MOSFET pass transistor to
allow a low 85µA supply current—which is independent of
the load—as well as LDO voltage. The MAX8885 is opti-
mized to operate with low-cost, high-ESR output capaci-
tors such as small case-size tantalum capacitors. It is ideal
for cost-sensitive portable equipment such as PCS and
cellular phones. For a pin-compatible, functionally equiva-
lent device for use with a low-ESR, ceramic output capaci-
tor, refer to the MAX8875 data sheet.
The MAX8885 features a power-OK output that indicates
when the output is out of regulation, and is available in
preset output voltage versions of 5.0V, 3.3V, 3.0V, 2.7V,
and 2.5V. Other features include 1µA (max) shutdown cur-
rent, short-circuit protection, thermal shutdown protection,
and reverse-battery protection. The MAX8885 is available
in a miniature 5-pin SOT23 package.
ApplicationsPCS PhonesModems
Cellular PhonesHand-Held Instruments
Cordless PhonesPalmtop Computers
PCMCIA CardsElectronic Planners
FeaturesOptimized for Low-Cost Tantalum CapacitorsPin Compatible with MIC5206Undervoltage Power-OK OutputPreset Output Voltages (±1% accuracy)Guaranteed 150mA Output Current85µA No-Load Supply CurrentLow 110mV Dropout at 100mA Load (165mV at
150mA load)Thermal-Overload and Short-Circuit ProtectionReverse-Battery Protection60dB PSRR at 100Hz1µA max Shutdown Current
MAX8885
150mA, Low-Dropout Linear Regulator
with Power-OK OutputGND
POKSHDN5OUTIN
MAX8885
SOT23-5TOP VIEW4
MAX8885
INPUT
+2.5V TO +6.5VOUT
SHDN
GND
OUTPUT
PRESET
2.5V TO 5.0V
150mA
POK
COUT
4.7μF
100k
CIN
1μF
OFF
ypical Operating Circuit19-1576; Rev 0; 10/99
PARTMAX8885EUK25
MAX8885EUK27
MAX8885EUK30-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGEPIN-PACKAGE5 SOT23-5
5 SOT23-5
5 SOT23-5
Note: See Output Voltage Selector Guide for more information.
Pin Configuration
Ordering InformationMAX8885EUK33
MAX8885EUK50-40°C to +85°C
-40°C to +85°C5 SOT23-5
5 SOT23-5
Output Voltage Selector Guide
Note: Other output voltages between 2.5V and 5.0V are avail-able in 100mV increments—contact factory for information.
Minimum order quantity is 25,000 units.
PARTMAX8885EUK25
MAX8885EUK27
MAX8885EUK30
MAX8885EUK33
MAX8885EUK50
VOUT(V)TOP MARK
ADLE
ADLF
ADLG
ADLH
ADLJ
MAX8885
150mA, Low-Dropout Linear Regulator
with Power-OK Output
ABSOLUTE MAXIMUM RATINGS
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)
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.
IN, SHDN, POK to GND...............................................-7V to +7V
SHDNto 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= +25°C= -40°C to +85°C, IOUT= 100µA
VIN= 2.5V to 5.5V= +25°C, IOUT= 100µA
SHDN= GND
f = 100Hz
IOUT= 100mA
IOUT= 50mA
COUT= 10µF, f = 10Hz to 100kHz
IOUT= 100µA to 120mA, COUT= 4.7µF
IOUT= 100µA
IOUT= 150mA= -40°C to +85°C,
IOUT= 100µA to 120mA
VIN= (VOUT+ 0.1V) to 6.5V, IOUT= 1mA
IOUT= 100µA
IOUT= 150mA
CONDITIONS0.05nA0100ISHDNSHDNInput Bias Current
0.4VILV2.0VIHSHDNInput Threshold
0.02µA0.0051IOFFShutdown Supply Current60PSRROutput Voltage AC Power-
Supply Rejection Ratio
µVRMS170Output Voltage Noise
%/mA0.01ΔVLDRLoad Regulation
%/V-0.1500.15ΔVLNRLine Regulation
165-2212.56.5VINInput Voltage
Output Voltage Accuracy
110220mV50
VIN-
VOUTDropout Voltage (Note 2)
1002150IOUTMaximum Output Current160390ILIMCurrent Limit85180IQGround Pin Current
UNITSMINTYPMAXSYMBOLPARAMETER= +25°C= +85°C
VSHDN= 5.5V or GNDTA= +85°C
SHUTDOWN
MAX8885
150mA, Low-Dropout Linear Regulator
with Power-OK Output
Note 1:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed through cor-
relation using Statistical Quality Control (SQC) methods.
Note 2:Dropout voltage is defined as VIN- VOUT, when VOUTis 100mV below the value of VOUTfor VIN= VOUT+ 0.5V.
ELECTRICAL CHARACTERISTICS (continued)(VIN= VOUT(NOMINAL)+ 1V, SHDN= IN, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
CONDITIONSUNITSMINTYPMAXSYMBOLPARAMETERISINK= 1mA
Hysteresis, IOUT= 0
In dropout, VOUTfalling
(1 - VOUT/ VOUT(NOMINAL))100, VOUTfalling,
IOUT= 00.4VOLPOK Output Voltage Low
-5.3%-5-8
VPOKPower-OK Voltage Threshold
0 ≤VPOK≤6.5V, VOUTin regulation20ΔTSHDNThermal Shutdown Hysteresis170TSHDNThermal Shutdown Temperature1POK Output Leakage Current
Typical Operating Characteristics(MAX8885EUK30, VIN= +3.6V, CIN= 1µF, COUT= 4.7µF, SHDN= IN, TA= +25°C, unless otherwise noted.)
GROUND PIN CURRENT
vs. INPUT VOLTAGE
MAX8885toc01
INPUT VOLTAGE (V)
GROUND PIN CURRENT (
IOUT = 0
IOUT = 150mA
GROUND PIN CURRENT vs.
OUTPUT LOAD
MAX8885toc02
OUTPUT LOAD (mA)
GROUND PIN CURRENT (
VIN = 3.5V
VIN = 5.0V
GROUND PIN CURRENT vs.
OUTPUT LOAD
MAX8885toc03
OUTPUT LOAD (mA)
GROUND PIN CURRENT (
VIN = VOUT(NOMINAL) + 0.5V
VOUT = 5.0V
MAX8885EUK50
VOUT = 3.0V
MAX8885EUK30
POWER-OK OUTPUT
THERMAL PROTECTION
MAX8885
150mA, Low-Dropout Linear Regulator
with Power-OK Output
Typical Operating Characteristics (continued)(MAX8885EUK30, VIN= +3.6V, CIN= 1µF, COUT= 4.7µF, SHDN= IN, TA= +25°C, unless otherwise noted.)
GROUND PIN CURRENT
vs. TEMPERATURE
MAX8885toc04
TEMPERATURE (°C)
GROUND PIN CURRENT (
VIN = 5.0V
IOUT = 150mA
VIN = 3.6V
IOUT = 150mA
VIN = 3.6V OR 5.0V
IOUT = 0
OUTPUT VOLTAGE vs.
INPUT VOLTAGE
MAX8885toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
IOUT = 0
IOUT = 150mA
OUTPUT VOLTAGE vs. OUTPUT LOAD
MAX8885toc06
OUTPUT LOAD (mA)
OUTPUT VOLTAGE (V)
VIN = 3.6V
VIN = 5.0V
OUTPUT VOLTAGE vs. TEMPERATURE
OUTPUT VOLTAGE (V)
MAX8885toc07
TEMPERATURE (°C)
VIN = 5.0V
IOUT = 150mA
VIN = 3.6V OR 5.0V
IOUT = 0
VIN = 3.6V
IOUT = 150mA
DROPOUT VOLTAGE vs.
OUTPUT LOAD
MAX8885toc08
OUTPUT LOAD (mA)
DROPOUT VOLTAGE (mV)
TA = +25°C
TA = -40°C
TA = +85°C
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8885toc09
FREQUENCY (kHz)
PSRR (dB)
ROUT = 60Ω
COUT = 10μF
COUT = 1μF
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
MAX8885toc10
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY (
IOUT = 50mA
COUT = 10μF
COUT = 1μF
10ms/div
OUTPUT NOISE (10Hz TO 100kHz)VOUT
500μV/div
MAX8885toc11
COUT = 10μF
ILOAD = 50mA
REGION OF STABLE COUT ESR vs.
LOAD CURRENT
MAX8885toc12
LOAD CURRENT (mA)
OUT
ESR (
STABLE REGION: COUT = 4.7μF TO 10μF
150mA, Low-Dropout Linear Regulator
with Power-OK Output100μs/div
LINE-TRANSIENT RESPONSE3.00V
2.98V
3.02V
VIN
VOUT
MAX8885toc13
ROUT = 60Ω
5μs/div
LOAD-TRANSIENT RESPONSE3.05V
3.0V
50mA
VOUT
25mV/div
ILOAD
25mA/div
MAX8885toc14
VIN = VOUT + 0.5V
CIN = 1μF
100μs/div
SHUTDOWN DELAYVOUT
1V/div
MAX8885toc16
VSHDN
1V/div
RLOAD = 60Ω
200μs/div
POK OUTPUTVPOK
2V/div
VOUT
2V/div
MAX8885toc17
VIN
1V/div
10ms/div
POK STARTUP RESPONSE2.5V
2.5V
2.5V
VPOK
2.5V/div
VOUT
2.5V/div
MAX8885toc18
VIN
2.5V/div
Typical Operating Characteristics (continued)(MAX8885EUK30, VIN= +3.6V, CIN= 1µF, COUT= 4.7µF, SHDN= IN, TA= +25°C, unless otherwise noted.)
10μs/div
POK AND SHUTDOWN RESPONSEVPOK
VOUT
MAX8885toc19
VSHDN
RLOAD = 60Ω
5μs/div
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT3.05V
3.0V
50mA
MAX8885toc15
VIN = VOUT + 0.1V
CIN = 1μF
ILOAD
25mA/div
VOUT
25mV/div
MAX8885
MAX8885
150mA, Low-Dropout Linear Regulator
with Power-OK Output
Pin Description
FUNCTIONRegulator Output. Fixed 5.0V, 3.3V, 3.0V, 2.7V, or 2.5V output. Sources up to 150mA. Bypass
with 4.7µF (>0.5Ωtyp ESR) tantalum capacitor to GND.OUT5
Power-OK Output. Active low, open-drain output indicates an out-of-regulation condition.
Connect a 100kΩpull-up resistor to OUT for logic levels. If not used, leave this pin unconnected.POK4
Active-Low Shutdown Input. A logic low reduces the supply current to below 1µA. Connect to IN
for normal operation.SHDN3
PINGround. This pin also functions as a heatsink. Solder to a large pad or the circuit-board ground
plane to maximize power dissipation.GND2
Regulator Input. Supply voltage can range from +2.5V to +6.5V. Bypass with 1µF capacitor to GND
(see Capacitor Selectionand Regulator Stability).IN1
NAME
Detailed DescriptionThe MAX8885 is a low-dropout, low-quiescent-current
linear regulator designed primarily for battery-powered
applications using low-cost, high-ESR tantalum capaci-
tors. The device delivers up to 150mA and is available
with preset output voltages of 2.5V, 2.7V, 3.0V, 3.3V, or
5.0V. The MAX8885 consists of a 1.25V reference, error
amplifier, P-channel pass transistor, power-OK compara-
tor, and internal feedback voltage divider (Figure 1).
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
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 volt-
age is too high, the pass-transistor gate is pulled up,
allowing less current to pass to the output. The output
voltage is fed back through an internal resistor voltage
divider connected to the OUT pin.
Additional blocks include a current limiter, reverse-bat-
tery protection, thermal sensor, and shutdown logic.
Output VoltageThe MAX8885 is supplied with factory-set output volt-
ages of 2.5V, 2.7V, 3.0V, 3.3V, or 5.0V. The part num-
ber’s two-digit suffix identifies the nominal output
voltage. For example, the MAX8885EUK33 indicates a
preset output voltage of 3.3V (see Output Voltage
Selector Guide).
Internal P-Channel Pass TransistorThe MAX8885 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 signifi-
cantly. PNP-based regulators waste considerable cur-
rent in dropout when the pass transistor saturates. They
also use high base-drive currents under large loads.
The MAX8885 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 dur-
ing 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 100kΩresis-
tor works well for most applications. The POK function is
not active during shutdown. A capacitor to GND may be
added to generate a power-on-reset (POR) delay, which
can operate down to VIN≤1V. (See POK Startup
Response in the Typical Operating Circuit.)
Current LimitThe MAX8885 includes a current limiter that monitors
and controls the pass transistor’s gate voltage, limiting
the output current to 390mA (typ). For design purpos-
es, 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 ProtectionWhen 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
