MAX8576 MAXIM [Maxim Integrated Products], MAX8576 Datasheet

MAX8576

Manufacturer Part Number

MAX8576

Description

3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX8576.pdf (18 pages)

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Current page: 1 of 18
Download datasheet (503Kb)

The MAX8576–MAX8579 synchronous PWM buck con-

trollers use a hysteretic voltage-mode control algorithm

to achieve a fast transient response without requiring

loop compensation. The MAX8576/MAX8577 contain an

internal LDO regulator allowing the controllers to func-

tion from only one 3V to 28V input supply. The

MAX8578/MAX8579 do not contain the internal LDO

and require a separate supply to power the IC when the

input supply is higher than 5.5V. The MAX8576–

MAX8579 output voltages are adjustable from 0.6V to

0.9 x V

Nominal switching frequency is programmable over the

200kHz to 500kHz range. High-side MOSFET sensing is

used for adjustable hiccup current-limit and short-cir-

cuit protection. The MAX8576/MAX8578 can start up

into a precharged output without pulling the output volt-

age down. The MAX8577/MAX8579 have startup output

overvoltage protection (OVP), and will pull down a

precharged output.

19-3289; Rev 1; 6/05

µMAX is a registered trademark of Maxim Integrated Products, Inc.

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

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Motherboard Power Supplies

AGP and PCI-Express Power Supplies

Graphic-Card Power Supplies

Set-Top Boxes

Point-of-Load Power Supplies

at loads up to 15A.

INPUT

UP TO 28V

________________________________________________________________ Maxim Integrated Products

General Description

3V to 28V Input, Low-Cost, Hysteretic

Synchronous Step-Down Controllers

GND

Applications

MAX8576

MAX8577

OCSET

BST

♦ 3V to 28V Supply Voltage Range

♦ 1.2% Accurate Over Temperature

♦ Adjustable Output Voltage Down to 0.6V

♦ 200kHz to 500kHz Switching Frequency

♦ Adjustable Temperature-Compensated Hiccup

♦ Lossless Peak Current Sensing

♦ Monotonic Startup into Prebias Output

♦ Startup Overvoltage Protection

♦ Enable/Shutdown

♦ Adjustable Soft-Start

Pin Configurations appear at end of data sheet.

MAX8576EUB

MAX8577EUB

MAX8578EUB

MAX8579EUB

Current Limit

(MAX8576/MAX8578)

(MAX8577/MAX8579)

PART

Typical Operating Circuit

-40°C to +85°C

TEMP RANGE

Ordering Information

OUTPUT

0.6V TO 0.9 x

PIN-PACKAGE

10 µMAX

Features

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