MAX8625A Maxim Integrated Products, MAX8625A Datasheet

MAX8625A

Manufacturer Part Number

MAX8625A

Description

Step-Up/Down DC-DC Converter

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8625A.pdf (15 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

MAX8625AETD+T

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MAX8625AETD+T

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The MAX8625A PWM step-up/down regulator is intend-

ed to power digital logic, hard disk drives, motors, and

other loads in portable, battery-powered devices such

as PDAs, cell phones, digital still cameras (DSCs), and

MP3 players. The MAX8625A provides either a fixed

3.3V or adjustable output voltage (1.25V to 4V) at up to

0.8A from a 2.5V to 5.5V input. The MAX8625A utilizes

a 2A peak current limit.

Maxim’s proprietary H-bridge topology* provides a

seamless transition through all operating modes without

the glitches commonly seen with other devices. Four

internal MOSFETs (two switches and two synchronous

rectifiers) with internal compensation minimize external

components. A SKIP input selects a low-noise, fixed-

frequency PWM mode, or a high-efficiency skip mode

where the converter automatically switches to PFM

mode under light loads for best light-load efficiency.

The internal oscillator operates at 1MHz to allow for a

small external inductor and capacitors.

The MAX8625A features current-limit circuitry that shuts

down the IC in the event of an output overload. In addi-

tion, soft-start circuitry reduces inrush current during

startup. The IC also features True Shutdown

disconnects the output from the input when the IC is

disabled. The MAX8625A is available in a 3mm x 3mm,

14-pin TDFN package.

19-1006; Rev 0; 3/08

*US Patent #7,289,119.

True Shutdown is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.

PDAs and Smartphones

DSCs and Camcorders

MP3 Players and Cellular Phones

Battery-Powered Hard Disk Drive (HDD)

TOP VIEW

EP = EXPOSED PAD.

________________________________________________________________ Maxim Integrated Products

General Description

TDFN-EP

MAX8625A

High-Efficiency, Seamless Transition,

Pin Configuration

Applications

Step-Up/Down DC-DC Converter

, which

♦ Four Internal MOSFET True H-Bridge Buck/Boost

♦ Glitch-Free, Buck-Boost Transitions

♦ Minimal Output Ripple Variation on Transitions

♦ Up to 92% Efficiency

♦ 37µA (typ) Quiescent Current in Skip Mode

♦ 2.5V to 5.5V Input Range

♦ Fixed 3.3V or Adjustable Output

♦ 1µA (max) Logic-Controlled Shutdown

♦ True Shutdown

♦ Output Overload Protection

♦ Internal Compensation

♦ Internal Soft-Start

♦ 1MHz Switching Frequency

♦ Thermal-Overload Protection

♦ Small 3mm x 3mm, 14-Pin TDFN Package

Note: The device is specified over the -40°C to +85°C extended

temperature range.

+Denotes a lead-free package.

**EP = Exposed pad.

MAX8625AETD+

PART

OFF

SKIP

2.7V TO 5.5V

INPUT

PWM

Typical Operating Circuit

PIN-

PACKAGE

14 TDFN-EP**

(3mm x 3mm)

Ordering Information

SKIP

LX1

MAX8625A

TOP MARK

LX2

GND

OUT

REF

ABQ

Features

OUTPUT

3.3V

T1433-2

CODE

PKG

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