MAX8625
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
Features and Benefits
- 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
Product Details
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
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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