Low V, 20µA I, 1MHz Synchronous Boost Converter with True Shutdown

The MAX8627 step-up converter is a high-efficiency, low-quiescent current, synchronous boost converter with True Shutdown™ and inrush current limiting. The MAX8627 generates any boosted output voltage from 3V to 5V from either a 2-cell NiMH/NiCd or a single-cell Li+/Li polymer battery.

Quiescent current is only 20µA (typ), and at light loads the converter pulses only as needed for best efficiency. At higher loads, PWM mode maintains fixed 1MHz operation for lowest noise and ripple.

The MAX8627 includes an internal soft-start to limit inrush current to a maximum of 500mA. Additional features include True Shutdown, internal compensation, and adjustable current limit. The MAX8627 is available in a tiny 3mm x 3mm TDFN package and is ideal for use in handheld devices such as DSCs, PDAs, and smartphones.

Applications

* Cell Phones, PDAs, MP3 Players * DSC Motors and Backup Power * Microprocessor/DSP Core Power * Portable Handheld Devices

* 1MHz PWM Switching Frequency

* True Shutdown Output

* Up to 95% Efficiency

* 1.0A Guaranteed Output Current

* Soft-Start Eliminates Inrush Current

* 20µA (typ) Quiescent Current

* 0.1µA Logic-Controlled Shutdown

* Internal Synchronous Rectifier

* Internal Compensation

* Adjustable Current Limit

* Low-Noise Antiringing Feature

* Tiny 14-Pin, 3mm x 3mm, TDFN Package