Rainbow-electronics MAX8625A User Manual download pdf

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.

General Description

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

, which

disconnects the output from the input when the IC is

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

14-pin TDFN package.

Applications

PDAs and Smartphones

DSCs and Camcorders

MP3 Players and Cellular Phones

Battery-Powered Hard Disk Drive (HDD)

Features

♦ 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

MAX8625A

High-Efficiency, Seamless Transition,

Step-Up/Down DC-DC Converter

________________________________________________________________

Maxim Integrated Products

Ordering Information

MAX8625A

SKIP

GND

OUT

LX1

LX2

INPUT

2.7V TO 5.5V

OUTPUT

3.3V

OFF

PWM

SKIP

REF

Typical Operating Circuit

19-1006; Rev 1; 5/08

US Patent #7,289,119.

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

EVALUATION KIT

AVAILABLE

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

temperature range.

Denotes a lead-free package.

EP = Exposed pad.

PART

PIN-

PACKAGE

TOP MARK

MAX8625AETD+

14 TDFN-EP**

(3mm x 3mm)

ABQ

MAX8625A

TDFN-EP

TOP VIEW

245

13 11 10

GND

OUT

LX1

LX2

INLX1

GNDLX2

OUTSKIP

REFFB

EP = EXPOSED PAD.

Pin Configuration

1 2 3 4 5 6 ... 13 14

Summary of Contents

Page 1 - Step-Up/Down DC-DC Converter

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.Gener

Page 2

MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter10 _________________________________________________________________________

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MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter____________________________________________________________________________

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MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter12 _________________________________________________________________________

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MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter____________________________________________________________________________

Page 6

MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC ConverterMaxim cannot assume responsibility for use of any circuitry other than circu

Page 7

MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter2 __________________________________________________________________________

Page 8

MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter____________________________________________________________________________

Page 9

Typical Operating Characteristics(VIN= 3.6V, SKIP = GND, TA= +25°C, Figure 4, unless otherwise noted.)MAX8625AHigh-Efficiency, Seamless Transition, St

Page 10

Typical Operating Characteristics (continued)(VIN= 3.6V, SKIP = GND, TA= +25°C, Figure 4, unless otherwise noted.)MAX8625AHigh-Efficiency, Seamless Tr

Page 11

MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter6 __________________________________________________________________________

Page 12

MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter____________________________________________________________________________

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MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter8 __________________________________________________________________________

Page 14

MAX8625AHigh-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter____________________________________________________________________________

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Rainbow-electronics MAX8625A User Manual

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Summary of Contents

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