MAX8744A 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8744A

High-Efficiency, Quad Output, Main Power Supply Controllers for Notebook Computers

Maxim Integrated 

High-Efficiency, Quad Output, Main Power-

Supply Controllers for Notebook Computers

making the threshold to exit shutdown less accurate. To

guarantee startup, drive SHDN above 2V (SHDN input

rising-edge trip level). For automatic shutdown and

startup, connect SHDN to VIN. The accurate 1V falling-

edge threshold on SHDN can be used to detect a spe-

cific input voltage level and shut the device down. Once

in shutdown, the 1.6V rising-edge threshold activates,

providing sufficient hysteresis for most applications.

SMPS POR, UVLO, and Soft-Start

Power-on reset (POR) occurs when LDO5 rises above

approximately 1V, resetting the undervoltage, overvolt-

age, and thermal-shutdown fault latches. The POR cir-

cuit also ensures that the low-side drivers are pulled

high until the SMPS controllers are activated. Figure 2 is

the MAX8744A/MAX8745A block diagram.

FSEL

ILIM

SKIP

CSH3

CSL3

BST3

DH3

LX3

DL3

PGND

FB3

ON3

PGOOD5

PGOOD3

PGOODA

OSC

LDO5

LDO5

5V LINEAR

REGULATOR

LDO BYPASS

CIRCUITRY

IN

SHDN

LDO5

CSH5

CSL5

PWM3

CONTROLLER

(FIGURE 3)

PWM5

CONTROLLER

(FIGURE 3)

BST5

DH5

LX5

LDO5

DL5

FB

DECODE INTERNAL

(FIGURE 5) FB

POWER-GOOD AND FAULT

PROTECTION

(FIGURE 6)

MAX8744A

MAX8745A

FB

DECODE

(FIGURE 5)

ON5

FB5

REF

2.0V

R

REF

GND

R

AUXILIARY

LINEAR REGULATOR

DRVA

OUTA

FBA

ONA

Figure 2. Block Diagram

18 ______________________________________________________________________________________

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