MAX1639ESE Просмотр технического описания (PDF) - Maxim Integrated

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MAX1639ESE

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power

Maxim Integrated 

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

_______Standard Application Circuits

The predesigned MAX1639 circuit shown in Figure 1

meets a wide range of applications with output currents

up to 35A. Use Table 1 to select components appropri-

ate for the desired output current range, and adapt the

evaluation kit PC board layout as necessary. This cir-

cuit represents a good set of trade-offs between cost,

size, and efficiency while staying within the worst-case

specification limits for stress-related parameters, such

as capacitor ripple current.

The MAX1639 circuit was designed for the specified fre-

quencies. Do not change the switching frequency with-

out first recalculating component values—particularly

the inductance, output filter capacitance, and RC1

resistance values.

___________________Detailed Description

The MAX1639 is a BiCMOS power-supply controller

designed for use in switch-mode, step-down (buck)

topology DC-DC converters. Synchronous rectification

provides high efficiency. It is intended to provide the

high precision, low noise, excellent transient response,

and high efficiency required in today’s most demand-

ing applications.

R5

10Ω

VIN = 4.5V

TO 5.5V

C5

C6

0.1µF

10µF

TO VDD

VCC

C7

0.1µF

VDD

C1

D2

CMPSH-3

R6

100k

PWROK

BST

DH

N1

R4

(OPTIONAL)

C3

0.1µF

LX

MAX1639

R3

(OPTIONAL)

DL

FREQ

L1

R1

D1

N2

(OPTIONAL)

VOUT = 1.1V

TO 4.5V

C2

TO

AGND

REF

C4, 1.0µF

CERAMIC

CC2

CC2

RC1 0.056µF

1k

CC1

CC1

1000pF

PGND

CSH

CSL

FB

AGND

R7

R8

C8

Figure 1. Standard Application Circuit

6 _______________________________________________________________________________________

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