MAX1714(1999) Просмотр технического описания (PDF) - Maxim Integrated

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MAX1714
(Rev.:1999)

High-Speed Step-Down Controller for Notebook Computers

Maxim Integrated 

High-Speed Step-Down Controller

for Notebook Computers

Standard Application Circuit

The standard application circuit (Figure 1) generates a

low-voltage rail for general-purpose use in a notebook

computer (I/O supply, fixed CPU core supply, DRAM

supply). This DC-DC converter steps down a battery or

AC adapter voltage to voltages from 1.0V to 5.5V with

high efficiency and accuracy.

See Table 1 for a list of component selections for com-

mon applications. Table 2 lists component manufacturers.

Detailed Description

The MAX1714 buck controller is targeted for low-voltage

power supplies for notebook computers. Maxim‘s propri-

etary Quick-PWM pulse-width modulator in the MAX1714

is specifically designed for handling fast load steps

while maintaining a relatively constant operating fre-

quency and inductor operating point over a wide range

of input voltages. The Quick-PWM architecture circum-

vents the poor load-transient timing problems of fixed-

frequency current-mode PWMs while also avoiding the

problems caused by widely varying switching frequen-

cies in conventional constant-on-time and constant-off-

time PWM schemes.

VIN

4.5V TO 28V

+5V

BIAS SUPPLY

C5

4.7µF

R1

20Ω

C6

3.3µF

C1

ON/OFF

CONTROL

LOW-NOISE

CONTROL

VCC

VDD

V+

BST

SHDN

DH

SKIP

MAX1714

LX

D2

CMPSH-3

C7

0.1µF

Q1

L1

VOUT

C2

DL

Q2 D1

C4

0.22µF

TON

REF

AGND

(GND)

ILIM

PGND

(GND)

FB

OUT

PGOOD

+5V

R2

100k

POWER-GOOD

INDICATOR

+5V

( ) = ARE FOR THE MAX1714B ONLY.

NOTE: IN THE MAX 1714B, AGND AND PGND ARE INTERNALLY CONNECTED TO THE GND PIN.

Figure 1. Standard Application Circuit

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