MAX8556 MAXIM [Maxim Integrated Products], MAX8556 Datasheet - Page 6

• Manufacturer Part Number: MAX8556
• Description: 4A Ultra-Low-Input-Voltage LDO Regulators
• Manufacturer: MAXIM [Maxim Integrated Products]

4A Ultra-Low-Input-Voltage
LDO Regulators
6
GND
EN
IN
_______________________________________________________________________________________
7–11
PIN
1–6
EP
12
13
14
15
16
PROTECTION
SHUTDOWN
OVERLOAD
THERMAL-
LOGIC
(MAX8556)
(MAX8557)
NAME
GND
OUT
POK
POR
N.C.
EN
(MAX8557)
FB
IN
—
MAX8556
LDO Input. Connect to a 1.425V to 3.6V input voltage. Bypass with a 22µF ceramic capacitor to GND.
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.
Power-OK Output. Open-drain output that pulls low when V
regulation voltage or when EN is low. POK is high impedance when V
nominal output voltage. Connect a resistor from POK to a logic supply of less than 3.6V.
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.
Feedback Input. V
to GND to set the desired output voltage.
Ground
Connect to GND or Floating
Enable Input. Connect to GND or a logic low to shut down the device. Connect to IN or a logic high
for normal operation.
Exposed Paddle. Connect to GND and to a ground plane for heatsinking.
REF
0.50V
0.45V
0.55V
FB
is regulated to 0.5V. Connect to the center tap of a resistor-divider from output
UNDERVOLTAGE
THRESHOLD
LOCKOUT
FUNCTION
COMPARATOR
CURRENT-
OUT
ERROR
AMP
LIMIT
POK (POR)
CIRCUITRY
is outside ±10% of the expected
OUT
is within ±10% of the
Pin Description
Block Diagram
N
P
OUT
FB
POK
(POR)