MAX5950ETJ+【PDF 1/28 页】IC PWM CTRL HOT-SW 12V 32TQFN-EP

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General Description

The MAX5950 is a 12V pulse-width modulated (PWM),

step-down, DC-DC controller with integrated hot-swap

controller. The device operates over the 8V to 16V input-

voltage range or 5V ?0% and provides an adjustable

output from 0.8V to 5.5V. The device delivers up to 10A

of load current with excellent load-and-line regulation.

The MAX5950 is optimized for PCIe

?/DIV>

ExpressModule"

power-management application.

The MAX5950 features a hot-swap controller that pro-

vides inrush current control during module insertion

and removal, as well as short-circuit protection during

normal operation. The MAX5950 features an internal

charge pump that provides the gate drive for an exter-

nal n-channel MOSFET. A DCENO logic output indi-

cates the completion of the inrush cycle.

The MAX5950 PWM section utilizes a voltage-mode con-

trol scheme for good noise immunity and offers external

compensation, allowing for maximum flexibility with a

wide selection of inductor values and capacitor types.

The device operates at a fixed switching frequency that

is programmable from 100kHz to 1MHz and can be syn-

chronized to an external clock signal through the

SYNCIN input. The device includes undervoltage lockout

(UVLO) and digital soft-start. Protection features include

lossless valley-mode current limit, hiccup-mode output

short-circuit protection, and thermal shutdown.

The MAX5950 is available in a space-saving 5mm x

5mm, 32-pin thin QFN package and is specified for

operation over the -40癈 to +85癈 extended tempera-

ture range. Refer to the MAX5951 data sheet for a pin-

compatible, general-purpose PWM controller.

Applications

PCIe ExpressModule

General 12V-Input PWM Controllers with

Hot-Swap

Blade Servers

RAID

Base Stations

Work Stations

Features

o 8V to 16V or 5V ?/SPAN>10% Input-Voltage Range

o Integrated Hot-Swap Controller

o Lossless Valley-Mode Current Sensing

o Output Voltage Adjustable from 0.8V to 5.5V

o Voltage-Mode Control

o External Compensation for Maximum Flexibility

o Digital Soft-Start

o Sequencing or Ratiometric Tracking

o Startup Synchronization

o Programmable PGOOD Output

o Programmable Switching Frequency from 100kHz

to 1MHz

o External Frequency Synchronization

o SYNCIN and SYNCOUT Enable 180?/SPAN> Out-of-Phase

Operation

o Thermal Shutdown and Short-Circuit Protection

o Space-Saving 5mm x 5mm, 32-Pin TQFN Package

12V PWM Controller with Hot-Swap

________________________________________________________________ Maxim Integrated Products 1

19-0545; Rev 0; 6/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxims website at www.maxim-ic.com.

MAX5950

TQFN

(5mm x 5mm)

TOP VIEW

DREG

20 19 18

AGND

THRESH

DCENI

DCENO

BST

PGI

REG

MPWRGD

15 SYNCOUT

PGND

16 SYNCIN

CS-

Pin Configuration

Ordering Information

PART

TEMP RAN E

PIN-

PACKAGE

PKG

CODE

MAX

ET + -40癈 to +85癈 32 TQFN-EP*

T 2 -4

PCIe is a registered trademark and ExpressModule is a

trademark of PCI-SIG Corp.

+Denotes lead-free package.

*EP = Exposed pad.

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