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MAX8878EZK28+T

P1-P3P4-P6P7-P9P10-P10
MAX8877/MAX8878
Low-Noise, Low-Dropout, 150mA Linear
Regulators with '2982 Pinout
4 _______________________________________________________________________________________
0
50
150
100
200
250
0406020 80 100 120 140 160
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK25)
MAX8877-10
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
0
50
100
150
200
0406020 80 100 120 140 160
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX887_EUK50)
MAX8877-11
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
70
0
10
20
30
40
50
60
0.01 0.1 1 10 100 1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8877-12
FREQUENCY (kHz)
PSRR (dB)
I
LOAD
= 50mA
C
BP
= 0.1µF
C
OUT
= 10µF
C
OUT
= 1µF
10
0.01
0101 1000
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
0.1
1
MAX8877-13
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
100
C
BP
= 0.01µF
I
LOAD
= 10mA
C
OUT
= 10µF
C
OUT
= 1µF
80
0
10
20
30
40
50
60
70
0.001 0.01 0.1
OUTPUT NOISE vs. BP CAPACITANCE
MAX8877-14
BP CAPACITANCE (µF)
OUTPUT NOISE (µV
RMS
)
MAX887_EUK50
C
OUT
= 10µF
I
LOAD
= 10mA
f = 10Hz to 100kHz
MAX887_EUK30
MAX887_EUK25
0
20
10
40
30
50
60
1 10 100 1000
OUTPUT NOISE vs. LOAD CURRENT
MAX8877-15
LOAD CURRENT (mA)
OUTPUT NOISE (µV
RMS
)
MAX887_EUK50
C
OUT
= 10µF
C
BP
= 0.01µF
f = 10Hz to 100kHz
MAX887_EUK30
MAX887_EUK25
2.40
2.45
2.50
2.55
2.60
-40 40200-20 60 80 100
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX887_EUK25)
MAX8877-07
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
I
LOAD
= 50mA
4.8
4.9
5.0
5.1
5.2
-40 40200-20 60 80 100
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX887_EUK50)
MAX8877-08
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
I
LOAD
= 50mA
0
60
40
20
100
80
180
160
140
120
200
-40 -20 0 20 40 60 80 100
GROUND PIN CURRENT
vs. TEMPERATURE
MAX8877-09
TEMPERATURE (°C)
GROUND PIN CURRENT (µA)
MAX887_EUK50
MAX887_EUK25
I
LOAD
= 50mA
Typical Operating Characteristics (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 0.01µF, T
A
= +25°C, unless otherwise
noted.)
MAX8877/MAX8878
Low-Noise, Low-Dropout, 150mA Linear
Regulators with '2982 Pinout
_______________________________________________________________________________________ 5
3.00V
2.99V
3.01V
V
OUT
I
LOAD
50mA
10µs/div
LOAD-TRANSIENT RESPONSE
MAX8877-19
MAX887_EUK30, V
IN
= V
OUT
+ 0.5V,
C
IN
= 10µF, I
LOAD
= 0mA TO 50mA
3.00V
2.99V
3.01V
V
OUT
I
LOAD
50mA
10µs/div
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX8877-20
MAX887_EUK30, V
IN
= V
OUT
+ 0.1V,
C
IN
= 10µF, I
LOAD
= 0mA TO 50mA
1V
0V
0V
2V
2V
5µs/div
MAX887_EUK25
SHUTDOWN EXIT DELAY
MAX8877-21
MAX887_EUK25, I
LOAD
= 50mA
V
SHDN
V
OUT
C
BP
= 0.01µF
C
BP
= 0.1µF
0V
0V
4V
2V
2V
5µs/div
MAX887_EUK50
SHUTDOWN EXIT DELAY
MAX8877-22
MAX887_EUK50, I
LOAD
= 50mA
V
SHDN
V
OUT
C
BP
= 0.01µF
C
BP
= 0.1µF
0V
0V
5V
2V
V
SHDN
V
OUT
500µs/div
ENTERING SHUTDOWN
MAX8877-23
MAX8878, NO LOAD
1ms/div
MAX887_EUK25, C
OUT
= 10µF, I
LOAD
= 10mA, C
BP
= 0.1µF
OUTPUT NOISE 10Hz TO 100kHz
V
OUT
50µV/div
MAX8877-16
100
0.01
0 100 150
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
0.1
MAX8877-17
LOAD CURRENT (mA)
C
OUT
ESR (Ω)
1
10
C
OUT
= 10µF
C
OUT
= 1µF
STABLE REGION
3.000V
2.999V
3.001V
3V
4V
V
IN
V
OUT
100µs/div
LINE-TRANSIENT RESPONSE
MAX8877-18
MAX887_EUK30, I
LOAD
= 50mA
Typical Operating Characteristics (continued)
(V
IN
= V
OUT(NOMINAL)
+ 0.5V or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 1µF, C
BP
= 0.01µF, T
A
= +25°C, unless otherwise
noted.)
MAX8877/MAX8878
_______________Detailed Description
The MAX8877/MAX8878 are low-noise, low-dropout,
low-quiescent-current linear regulators designed pri-
marily for battery-powered applications. The parts are
available with preset output voltages ranging from 1.5V
to 5V, in 100mV increments. These devices can supply
loads up to 150mA. As illustrated in Figure 1, the
MAX8877/MAX8878 consist of a 1.25V reference, error
amplifier, P-channel pass transistor, and internal feed-
back 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 is fed back through an internal resistor voltage
divider connected to the OUT pin.
An external bypass capacitor connected to the BP pin
reduces noise at the output. Additional blocks include a
current limiter, reverse battery protection, thermal sen-
sor, and shutdown logic. The MAX8878 also includes
an auto-discharge function, which actively discharges
the output voltage to ground when the device is placed
in shutdown mode.
Low-Noise, Low-Dropout, 150mA Linear
Regulators with '2982 Pinout
6 _______________________________________________________________________________________
SHUTDOWN
AND
POWER-ON
CONTROL
ERROR
AMP
1.25V
REF
P
N
*
OUT
BP
* AUTO-DISCHARGE, MAX8878 ONLY
GND
IN
SHDN
MAX8877
MAX8878
MOS DRIVER
WITH I
LIMIT
THERMAL
SENSOR
REVERSE
BATTERY
PROTECTION
Figure 1. Functional Diagram
______________________________________________________________Pin Description
PIN NAME FUNCTION
1IN
Regulator Input. Supply voltage can range from 2.5V to 6.5V. Bypass with a 1µF capacitor to GND
(see Capacitor Selection and Regulator Stability section).
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 10nA. On the MAX8878, a
logic low also causes the output voltage to discharge to GND. Connect to IN for normal operation.
4BP
Reference-Noise Bypass. Bypass with a low-leakage, 0.01µF ceramic capacitor for reduced noise at
the output.
5 OUT
Regulator Output. Sources up to 150mA. Bypass with a 1µF (<0.2Ω typical ESR) capacitor to GND
for V
OUT
≥ 2.5V and 3.3µF for V
OUT
< 2.5V.
P1-P3P4-P6P7-P9P10-P10

MAX8878EZK28+T

Mfr. #:
Buy MAX8878EZK28+T
Manufacturer:
Maxim Integrated
Description:
LDO Voltage Regulators 150mA Linear Regulato
Lifecycle:
New from this manufacturer.
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