OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX8557ETE+T

P1-P3P4-P6P7-P9P10-P10
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
EN
= V
IN
= +1.8V, V
OUT
= +1.5V, I
OUT
= 4A, C
OUT
= 20µF, C
IN
= 20µF, and T
A
= +25°C, unless otherwise noted.)
GND CURRENT vs. TEMPERATURE
MAX8556 toc04
TEMPERATURE (
°
C)
GND CURRENT (µA)
603510-15
100
200
300
400
500
600
700
800
900
0
-40 85
I
LOAD
= 2A
I
LOAD
= 0A
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8556 toc05
LOAD CURRENT (A)
DROPOUT VOLTAGE (mV)
3.53.02.0 2.51.0 1.50.5
10
20
30
40
50
60
70
80
90
0
0 4.0
V
IN
= 1.5V
LINE-TRANSIENT RESPONSE
MAX8556 toc06
100
µ
s/div
1.8V
10mV/div
2.5V
V
IN
V
OUT
(AC-COUPLED)
4A LOAD-TRANSIENT RESPONSE
MAX8556 toc07
40µs/div
2A/div
50mV/div
V
OUT
(AC-COUPLED)
I
OUT
2A LOAD-TRANSIENT RESPONSE
MAX8556 toc08
40µs/div
1A/div
50mV/div
V
OUT
(AC-COUPLED)
I
OUT
SHORT-CIRCUIT WAVEFORMS
MAX8556 toc10
200µs/div
1V/div
5A/div
2V/div
V
IN
3.6V
V
OUT
I
OUT
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
_______________________________________________________________________________________
5
EXPOSED PADDLE TEMPERATURE
vs. AMBIENT TEMPERATURE
MAX8556 toc13
AMBIENT TEMPERATURE (°C)
EXPOSED PADDLE TEMPERATURE (°C)
68513417
10
20
30
40
50
60
70
80
90
100
0
085
DATA TAKEN USING
MAX8556 EVALUATION KIT
FB REGULATION vs. TEMPERATURE
MAX8556 toc14
TEMPERATURE (°C)
FB (V)
603510-15
0.495
0.500
0.505
0.510
0.490
-40 85
I
LOAD
= 50mA
FOLDBACK CURRENT-LIMIT WAVEFORMS
MAX8556 toc15
100µs/div
500mV/div
5A/div
V
OUT
I
OUT
CURRENT-LIMIT THRESHOLD
vs. TEMPERATURE
MAX8556 toc16
TEMPERATURE (°C)
CURRENT-LIMIT THRESHOLD (A)
603510-15
6.2
6.4
6.6
6.8
7.0
7.2
7.4
7.6
7.8
8.0
6.0
-40 85
PSRR vs. FREQUENCY
MAX8556 toc11
FREQUENCY (kHz)
PSRR (dB)
10010
10
20
30
40
50
60
70
80
90
0
1 1000
V
IN
= 2.5V
I
LOAD
= 1A
STARTUP WAVEFORMS
MAX8556 toc12
100µs/div
1V/div
2V/div
2A/div
V
IN
I
IN
V
OUT
Typical Operating Characteristics (continued)
(V
EN
= V
IN
= +1.8V, V
OUT
= +1.5V, I
OUT
= 4A, C
OUT
= 20µF, C
IN
= 20µF, and T
A
= +25°C, unless otherwise noted.)
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1–6 IN
LDO Input. Connect to a 1.425V to 3.6V input voltage. Bypass with a 22µF ceramic capacitor to GND.
7–11 OUT
LDO Output. Bypass with 2 x 10µF ceramic capacitors to GND. A smaller capacitance can be used if
the maximum load current is less than 4A.
POK
(MAX8556)
Power-OK Output. Open-drain output that pulls low when V
OUT
is outside ±10% of the expected
regulation voltage or when EN is low. POK is high impedance when V
OUT
is within ±10% of the
nominal output voltage. Connect a resistor from POK to a logic supply of less than 3.6V.
12
POR
(MAX8557)
Power-On Reset. Open-drain output goes high impedance 140ms after the output is above 90% of its
nominal regulation voltage. POR pulls low immediately after an output fault or when EN is low.
Connect a resistor from POR to a logic supply of less than 3.6V.
13 FB
Feedback Input. V
FB
is regulated to 0.5V. Connect to the center tap of a resistor-divider from output
to GND to set the desired output voltage.
14 GND Ground
15 N.C. Connect to GND or Leave Unconnected
16 EN
Enable Input. Connect to GND or a logic low to shut down the device. Connect to IN or a logic high
for normal operation.
— EP Exposed Paddle. Connect to GND and to a ground plane for heatsinking.
P
MAX8556
(MAX8557)
THERMAL-
OVERLOAD
PROTECTION
REF
SHUTDOWN
LOGIC
ERROR
AMP
CURRENT-
LIMIT
COMPARATOR
THRESHOLD
EN
GND
IN
0.50V
OUT
FB
POK
(POR)
0.45V
0.55V
UNDERVOLTAGE
LOCKOUT
POK (POR)
CIRCUITRY
N
Block Diagram
P1-P3P4-P6P7-P9P10-P10

MAX8557ETE+T

Mfr. #:
Buy MAX8557ETE+T
Manufacturer:
Maxim Integrated
Description:
LDO Voltage Regulators 4A Ultra-Low-Input-V LDO Regulator
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet