19-1556; Rev 1; 12/00
150mA, Low-Dropout Linear Regulator
with Power-OK Output
General Description
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 sup-
ply 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 indi-
cates 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 out-
put capacitor. For a pin-compatible, functionally equivalent
device for use with a higher ESR output capacitor, see the
MAX8885 data sheet.
o
Power-OK Output
o
Small Output Capacitor (1µF ceramic)
o
Preset Output Voltages (±1% accuracy)
o
Guaranteed 150mA Output Current
o
85µA No-Load Supply Current
o
Low 110mV Dropout at 100mA Load (165mV at
150mA load)
o
Thermal-Overload and Short-Circuit Protection
o
Reverse-Battery Protection
o
60dB PSRR at 100Hz
o
1µA max Shutdown Current
Features
MAX8875
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
PCS Telephones
Cellular Telephones
Cordless Telephones
PCMCIA Cards
Hand-Held Instruments
Palmtop Computers
Electronic Planners
Modems
Output Voltage Selector Guide
PART
MAX8875EUK15-T
MAX8875EUK25-T
MAX8875EUK27-T
MAX8875EUK30-T
MAX8875EUK33-T
MAX8875EUK50-T
V
OUT
(V)
1.5
2.5
2.7
3.0
3.3
5.0
TOP MARK
ADQI
ADKZ
ADLA
ADLB
ADLC
ADLD
Typical Operating Circuit
OUTPUT
PRESET
1.5V TO 5.0V
150mA
C
OUT
1µF
Note:
Other output voltages between 1.5V and 5.0V are avail-
able in 100mV increments—contact the factory for information.
Minimum order quantity is 25,000 units.
INPUT
+2.5V TO +6.5V
IN
C
IN
1µF
OUT
Pin Configuration
TOP VIEW
IN
1
5
OUT
MAX8875
100k
ON
OFF
GND
2
MAX8875
SHDN
GND
POK
TO
µC
SHDN
3
4
POK
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.
150mA, Low-Dropout Linear Regulator
with Power-OK Output
MAX8875
ABSOLUTE MAXIMUM RATINGS
IN,
SHDN,
POK to GND...............................................-7V to +7V
SHDN
to IN ...............................................................-7V to +0.3V
OUT to GND ................................................-0.3V to (V
IN
+ 0.3V)
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (T
A
= +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
θ
JA
...............................................................................+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
(V
IN
= V
OUT(NOMINAL)
+ 1V,
SHDN
= IN, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage
SYMBOL
V
IN
T
A
= +25°C, I
OUT
= 100µA
Output Voltage Accuracy
I
OUT
= 100µA
T
A
= -40°C to +85°C
I
OUT
I
LIM
I
Q
I
OUT
= 100µA
I
OUT
= 150mA
I
OUT
= 100µA
Dropout Voltage (Note 2)
V
IN
- V
OUT
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
Line Regulation
Load Regulation
Output Voltage Noise
Output Voltage AC Power-
Supply Rejection Ratio
SHUTDOWN
Shutdown Supply Current
SHDN
Input Threshold
SHDN
Input Bias Current
I
OFF
V
IH
V
IL
I
SHDN
SHDN
= GND
V
IN
= 2.5V to 5.5V
SHDN
= IN or GND
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
2.0
0.4
0
0.05
100
0.005
0.02
1
µA
V
nA
PSRR
∆V
LNR
∆V
LDR
V
IN
= 2.5V or (V
OUT
+ 0.1V) to 6.5V, I
OUT
= 1mA
I
OUT
= 100µA to 120mA, C
OUT
= 1µF
C
OUT
= 10µF, f = 10Hz to 100kHz
f = 100Hz
-0.15
I
OUT
= 100µA to
120mA
CONDITIONS
MIN
2.5
-1.0
-2
-3
150
160
390
85
100
0.1
50
110
165
0
0.01
170
60
0.15
%/V
%/mA
µV
RMS
dB
220
mV
180
TYP
MAX
6.5
1.0
2
2
mA
mA
µA
%
UNITS
V
Maximum Output Current
Current Limit
Ground Pin Current
2
_______________________________________________________________________________________
150mA, Low-Dropout Linear Regulator
with Power-OK Output
MAX8875
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
OUT(NOMINAL)
+ 1V,
SHDN
= IN, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
POWER-OK OUTPUT
1 - V
OUT
/ V
OUT(NOMINAL)
100, I
OUT
= 0,
V
OUT
falling, V
OUT
≥
2.5V
1 - V
OUT
/V
OUT(NOMINAL)
100, I
OUT
= I
LIM
,
V
OUT
falling,
V
OUT
< 2.5V
Hysteresis, I
OUT
= 0
POK Output Voltage Low
POK Output Leakage Current
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
T
SHDN
∆T
SHDN
170
20
°C
°C
V
OL
I
SINK
= 1mA
0
≤
V
POK
≤
6.5V, V
OUT
in regulation
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
-3
-8.5
-7
-5.3
1
0.4
1
V
µA
-5
-10.5
-8
-13.5
%
-15
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power-OK Voltage Threshold
V
POK
In dropout, V
OUT
falling, V
OUT
≥
2.5V
Note 1:
Limits are 100% production tested at T
A
= +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 V
IN
- V
OUT
, when V
OUT
is 100mV below the value of V
OUT
for V
IN
= V
OUT
+ 0.5V. Applies only
for output voltages
≥
2.5V.
Typical Operating Characteristics
(MAX8875EUK30, V
IN
= +3.6V, C
IN
= C
OUT
= 1µF,
SHDN
= IN, T
A
= +25°C, unless otherwise noted.)
GROUND PIN CURRENT vs.
INPUT VOLTAGE
MAX8875toc01
GROUND PIN CURRENT vs.
OUTPUT LOAD
MAX8875toc02
GROUND PIN CURRENT vs.
OUTPUT LOAD
V
IN
= V
OUT(NOMINAL)
+ 0.5V
115
GROUND PIN CURRENT (µA)
110
105
100
95
90
85
V
OUT
= 3.0V
MAX8875EUK30
V
OUT
= 5.0V
MAX8875EUK50
MAX8875toc03
120
I
OUT
= 150mA
GROUND PIN CURRENT (µA)
100
80
60
40
20
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
I
OUT
= 0
115
110
V
IN
= 5.0V
105
100
V
IN
= 3.5V
95
90
85
0
120
GROUND PIN CURRENT (µA)
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
150mA, Low-Dropout Linear Regulator
with Power-OK Output
MAX8875
Typical Operating Characteristics (continued)
(MAX8875EUK30, V
IN
= +3.6V, C
IN
= C
OUT
= 1µF,
SHDN
= IN, T
A
= +25°C, unless otherwise noted.)
GROUND PIN CURRENT vs.
TEMPERATURE
MAX8875toc04
OUTPUT VOLTAGE vs.
INPUT VOLTAGE
MAX8875toc05
OUTPUT VOLTAGE vs. OUTPUT LOAD
MAX8875toc06
130
120
GROUND PIN CURRENT (µA)
110
100
90
80
70
60
-40
-15
10
35
60
V
IN
= 3.6V
I
OUT
= 150mA
V
IN
= 3.6V OR 5.0V
I
OUT
= 0
V
IN
= 5.0V
I
OUT
= 150mA
3.5
3.0
OUTPUT VOLTAGE (V)
2.5
2.0
I
OUT
= 150mA
1.5
1.0
0.5
0
I
OUT
= 0
3.10
OUTPUT VOLTAGE (V)
3.05
3.00
V
IN
= 3.6V
2.95
V
IN
= 5.0V
2.90
0
1
2
3
4
5
6
0
15
30 45 60 75 90 105 120 135 150
OUTPUT LOAD (mA)
INPUT VOLTAGE (V)
85
TEMPERATURE (°C)
OUTPUT VOLTAGE vs. TEMPERATURE
MAX8875toc07
DROPOUT VOLTAGE vs.
OUTPUT LOAD
MAX8875toc08
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8875toc09
3.10
250
70
60
50
PSRR (dB)
OUTPUT VOLTAGE (V)
3.05
DROPOUT VOLTAGE (mV)
V
IN
= 3.6V OR 5.0V
I
OUT
= 0
200
150
C
OUT
= 10µF
T
A
= +85°C
T
A
= +25°C
40
30
C
OUT
= 1µF
20
T
A
= -40°C
3.00
V
IN
= 3.6V
I
OUT
= 150mA
2.95
V
IN
= 5.0V
I
OUT
= 150mA
-40
-15
10
35
60
85
TEMPERATURE (°C)
100
50
10
0
0.01
2.90
0
0
15
30 45 60 75 90 105 120 135 150
OUTPUT LOAD (mA)
0.1
1
10
100
1000
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
MAX8875toc10
OUTPUT NOISE
MAX8875toc11
LINE-TRANSIENT RESPONSE
MAX8875toc13
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
10
C
OUT
= 10µF
I
OUT
= 50mA
V
IN
V
OUT
f = 10Hz TO 100kHz
C
OUT
= 10µF
I
OUT
= 50mA
V
OUT
500µV/div
5V
4V
1
0.1
3.02V
3.00V
2.98V
0.01
0.1
1
10
100
10ms/div
I
OUT
= 50mA
10µs/div
FREQUENCY (kHz)
4
_______________________________________________________________________________________
150mA, Low-Dropout Linear Regulator
with Power-OK Output
Typical Operating Characteristics (continued)
(MAX8875EUK30, V
IN
= +3.6V, C
IN
= C
OUT
= 1µF,
SHDN
= IN, T
A
= +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX8875toc14
MAX8875toc15
MAX8875
LOAD-TRANSIENT RESPONSE
3.01V
V
OUT
3.00V
2.99V
3.01V
V
OUT
I
LOAD
3.00V
2.99V
50mA
I
LOAD
50mA
0
10µs/div
V
IN
= V
OUT
+ 0.5V, I
OUT
= 0 TO 50mA
0
10µs/div
V
IN
= V
OUT
+ 0.1V, I
OUT
= 0 TO 50mA
SHUTDOWN DELAY
MAX8875toc16
POK OUTPUT
MAX8875toc17
3V
V
OUT
1V/div
0
2V
V
SHDN
1V/div
0
0
V
OUT
2V/div
V
POK
2V/div
0
4V
3V
2V
100µs/div
MAX8875EUK30, R
OUT
= 60Ω
R
POK
= 100kΩ
200µs/div
V
IN
1V/div
POK STARTUP RESPONSE
MAX8875toc18
POK AND SHUTDOWN RESPONSE
V
IN
2.5V/div
MAX8875toc19
5.0V
2V
0
V
SHDN
2V/div
0
2.5V
0
5.0V
V
POK
2.5V/div
0
10ms/div
R
POK
= 100kΩ
V
OUT
2.5V/div
2V
0
4V
V
OUT
2V/div
V
POK
2V/div
0
R
LOAD
= 60Ω
10µs/div
R
POK
= 100kΩ
_______________________________________________________________________________________
5
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