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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Description

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.
MAX8625: Typical Operating Circuit MAX8625: Typical Operating Circuit Enlarge+

Key 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

Applications/Uses

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

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX8625AEVKIT: Evaluation Kit for the MAX8625A
Request Reliability Report for: MAX8625A 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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