MAX8625A

High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter

Glitch-Free, Smooth Step-Up/Down Transition H-Bridge Converter

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Overview

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

The MAX8625A PWM step-up/down regulator is intended 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 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. An active-low 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 addition, 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

Battery-Powered Hard Disk Drive (HDD)
DSCs and Camcorders
MP3 Players and Cellular Phones
PDAs and Smartphones

Documentation

Data Sheet 1

MAX8625-MAX8625A: High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter Data Sheet (Rev.4) 01/14/2010

Technical Articles 3

Energy Management for Small Portable Systems 03/15/2000

Power-Supply Solutions for Altera FPGAs 04/24/2012

Power-Supply Solutions for Xilinx FPGAs 04/24/2012

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 4
MAX1556	PRODUCTION	16µA I_Q, 1.2A PWM Step-Down DC-DC Converters
MAX1557	PRODUCTION	16µA I_Q, 1.2A PWM Step-Down DC-DC Converters
MAX1760	PRODUCTION	0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter
MAX1763	PRODUCTION	1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter

Evaluation Kits

Evaluation Kit for the MAX8625A

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Features and Benefits

2.5V to 5.5V Input-Voltage Range
3.3V Preset Output Voltage
Programmable Output Voltage from 1.25V to 4.2V
Glitch-Free Step-Up/Step-Down Transitions
Selectable Switching Modes
- FPWM Mode
- High-Efficiency Skip Mode
Soft-Start
Output Overload Protection
Thermal Protection
Small 3mm x 3mm, 14-Pin TDFN IC Package
Lead(Pb)-Free and RoHS Compliant
Fully Assembled and Tested

Product Details

The MAX8625A evaluation kit (EV kit) is a fully assembled and tested PCB demonstrating the MAX8625A step-up/step-down switching regulator. The MAX8625A utilizes Maxim's proprietary H-bridge topology that provides seamless transitions through all converter operating modes without the glitches commonly seen with other similar devices. The MAX8625A EV kit converts a 2.5V to 5.5V DC input to a preprogrammed 3.3V output capable of providing up to 800mA. The output voltage is also programmable from 1.25V to 4.2V by use of a resistor-divider. The MAX8625A EV kit provides on-board jumper settings that allow programming one of two switching modes: fixed-frequency PWM (FPWM) or high-efficiency skip. Additional on-board jumpers allow enable or shutdown of the MAX8625A IC.