Rainbow-electronics MAX1639 Manual do Utilizador descarregar pdf (Página 6)

MAX1639

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

6 _______________________________________________________________________________________

(OPTIONAL)

PWROK

BST

PGND

CSH

AGND

CC1

CC2

CC1

1000pF

CC2

0.056µF

REF

C4, 1.0µF

CERAMIC

RC1

AGND

100k

0.1µF

10µF

10Ω

TO V

FREQ

0.1µF

CMPSH-3

0.1µF

= 4.5V

TO 5.5V

MAX1639

OUT

= 1.1V

TO 4.5V

CSL

Figure 1. Standard Application Circuit

_______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.

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