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MAX8875EUK33+T

P1-P3P4-P6P7-P9
MAX8875
150mA, Low-Dropout Linear Regulator
with Power-OK Output
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(MAX8875EUK30, V
IN
= +3.6V, C
IN
= C
OUT
= 1µF, SHDN = IN, T
A
= +25°C, unless otherwise noted.)
2.90
2.95
3.00
3.05
3.10
-40 10-15 35 60 85
OUTPUT VOLTAGE vs. TEMPERATURE
MAX8875toc07
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
V
IN
= 3.6V OR 5.0V
I
OUT
= 0
V
IN
= 3.6V
I
OUT
= 150mA
V
IN
= 5.0V
I
OUT
= 150mA
0
150
100
50
200
250
0453015 105907560 150135120
DROPOUT VOLTAGE vs.
OUTPUT LOAD
MAX8875toc08
OUTPUT LOAD (mA)
DROPOUT VOLTAGE (mV)
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
0
0.01 0.1 1 10 100 1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
10
20
30
40
50
60
70
MAX8875toc09
FREQUENCY (kHz)
PSRR (dB)
C
OUT
= 10µF
C
OUT
= 1µF
10
0.01
0.1 10 100
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
0.1
1
MAX8875toc10
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY (µV/√
Hz
)
1
C
OUT
= 10µF
I
OUT
= 50mA
10ms/div
OUTPUT NOISE
V
OUT
500µV/div
MAX8875toc11
f = 10Hz TO 100kHz
C
OUT
= 10µF
I
OUT
= 50mA
0
1.0
0.5
2.0
1.5
3.0
2.5
3.5
0231 456
OUTPUT VOLTAGE vs.
INPUT VOLTAGE
MAX8875toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
I
OUT
= 0
I
OUT
= 150mA
2.90
2.95
3.00
3.05
3.10
04530 105907515 60 120 135 150
OUTPUT VOLTAGE vs. OUTPUT LOAD
MAX8875toc06
OUTPUT LOAD (mA)
OUTPUT VOLTAGE (V)
V
IN
= 3.6V
V
IN
= 5.0V
10µs/div
LINE-TRANSIENT RESPONSE
I
OUT
= 50mA
5V
4V
3.00V
2.98V
3.02V
V
IN
V
OUT
MAX8875toc13
MAX8875
150mA, Low-Dropout Linear Regulator
with Power-OK Output
_______________________________________________________________________________________ 5
100µs/div
SHUTDOWN DELAY
MAX8875EUK30, R
OUT
= 60Ω
3V
0
0
2V
V
OUT
1V/div
MAX8875toc16
V
SHDN
1V/div
200µs/div
POK OUTPUT
R
POK
= 100kΩ
0
0
2V
3V
4V
V
POK
2V/div
V
OUT
2V/div
MAX8875toc17
V
IN
1V/div
10ms/div
POK STARTUP RESPONSE
5.0V
2.5V
0
0
0
5.0V
V
POK
2.5V/div
V
OUT
2.5V/div
MAX8875toc18
V
IN
2.5V/div
R
POK
= 100kΩ
10µs/div
POK AND SHUTDOWN RESPONSE
2V
0
2V
0
0
4V
V
POK
2V/div
V
OUT
2V/div
MAX8875toc19
V
SHDN
2V/div
R
LOAD
= 60Ω
R
POK
= 100kΩ
Typical Operating Characteristics (continued)
(MAX8875EUK30, V
IN
= +3.6V, C
IN
= C
OUT
= 1µF, SHDN = IN, T
A
= +25°C, unless otherwise noted.)
10µs/div
LOAD-TRANSIENT RESPONSE
V
IN
= V
OUT
+
0.5V, I
OUT
= 0 TO 50mA
3.01V
3.00V
2.99V
0
50mA
V
OUT
I
LOAD
MAX8875toc14
10µs/div
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
V
IN
= V
OUT
+
0.1V, I
OUT
= 0 TO 50mA
3.01V
3.00V
2.99V
0
50mA
V
OUT
I
LOAD
MAX8875toc15
_______________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 com-
parator, and internal feedback voltage divider.
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 feeds back through an internal resistor voltage
divider connected to the OUT pin.
Additional blocks include a current limiter, reverse-
battery protection, thermal sensor, and shutdown logic.
MAX8875
150mA, Low-Dropout Linear Regulator
with Power-OK Output
6 _______________________________________________________________________________________
Figure 1. Functional Diagram
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 V
OUT
≥ 2.5V. Bypass with 3.3µF (<0.2Ω typ ESR) ceramic
capacitor to GND for V
OUT
= 1.5V.
OUT5
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.
POK4
Active-Low Shutdown Input. A logic low reduces the supply current to below 1µA. Connect to IN for normal
operation.
SHDN
3
PIN
Ground. 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 to GND (see the Capacitor
Selection and Regulator Stability section).
IN1
FUNCTIONNAME
Pin Description
SHUTDOWN
LOGIC
ERROR
AMP
1.25V
REF
95%
REF
P
GND
IN
SHDN
MAX8875
THERMAL
SENSOR
REVERSE-
BATTERY
PROTECTION
MOS DRIVER
WITH I
LIMIT
POK
OUT
POK
P1-P3P4-P6P7-P9

MAX8875EUK33+T

Mfr. #:
Buy MAX8875EUK33+T
Manufacturer:
Maxim Integrated
Description:
LDO Voltage Regulators 150mA Linear Regulator
Lifecycle:
New from this manufacturer.
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