MAX1534 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1534

High-Efficiency, Triple-Output, Keep-Alive Power Supply for Notebook Computers

Maxim Integrated 

High-Efficiency, Triple-Output, Keep-Alive

Power Supply for Notebook Computers

0.01µF

IN

1V MAX1534

BP

REF

GND

1V VL

TSDN

STARTUP

SHDN

VL

REG

ENABLE

PMOS

DRIVER

IPEAK

VL

VL

ZX

1V

POK

OUT3_OK LDOIN

OUT2_OK

PRESET

OUT1_OK

0.9V

OUT1

PMOS

DRIVER

1V

1V

OUT2_OK

PMOS

DRIVER

LX

FB3

PRESET

LDOIN

OUT2

LDOIN 0.9V

FB1

OUT1_OK

FB2

0.9V

PRESET PRESET

PRESET PRESET

Figure 2. MAX1534 Functional Block Diagram

down, the supply current drops to 3.5µA, maximizing

battery life. The internal P-channel MOSFET in the buck

converter and linear regulators turn off to isolate each

input from its output. The output capacitance and load

current determine the rate at which the output voltage

decays. For automatic shutdown and startup, connect

SHDN to IN. Connect SHDN to IN through a resistive

voltage-divider to implement a programmable under-

voltage lockout. Do not leave SHDN floating.

Power-OK (POK)

The open-drain POK output is useful as a simple error

flag, as well as a delayed reset output. POK sinks cur-

rent when any of the three regulated output voltages is

11% below its regulation point. Connect POK to OUT_

through a high-value resistor for a simple error flag indi-

cator. Connect a capacitor from POK to GND to pro-

duce a delayed POK signal (delay set by the RC time

constant). POK is low in shutdown and is high imped-

ance when all three outputs are in regulation.

Thermal-Overload Protection

Thermal-overload protection limits total power dissipation

in the MAX1534. When the junction temperature exceeds

TJ = +160°C, a thermal sensor turns off the pass transis-

tor, allowing the IC to cool. The thermal sensor turns the

IC on again after the IC’s junction temperature cools by

15°C, resulting in a pulsed output during continuous

thermal-overload conditions.

Thermal-overload protection is designed to protect the

MAX1534 in the event of fault conditions. For continu-

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