DESCRIPTION

The SS6612 is a high-efficiency step-up DC/DC converter, with a start-up voltage as low as 0.8V, and an operating voltage down to 0.7V. Consuming only 20μA of quiescent current, this device includes a built-in synchronous rectifier that reduces size and cost by eliminating the need for an external Schottky diode, and improves overall efficiency by minimizing losses.

The switching frequency can range up to 500KHz depending on the load and input volt age. The output voltage can be easily set; by two external resistors for1.8V to 5.5V; connecting FB to OUT to get 3.3V; or connecting to GND to get 5.0V. For additional design flexibility, the peak current of theinternal switch is selectable (0.65A or 1.0A). The SS6612 also features a circuit that eliminates noise caused by inductor ringing.

FEATURES

High efficiency (93 with VIN=2.4V,VOUT= 3.3V, IOUT=200mA)

Output current up to 500mA. (VIN=2.4V, at VOUT=3.3V, CLSEL=OUT)

Quiescent supplycurrentof 20mA

Power-saving shutdown mode (0.1μA typical).

Internal synchronous rectifier (no externaldiode required).

Selectable current limit for reduced ripple.

Low-noise, anti-ringing feature.

On-chip low-battery detector.

Low-battery hysteresis.

Space-saving package: MSOP-10

APPLICATIONS

Palmtop & Notebook Computers.

PDAs

Wireless Phones

Pocket Organizers.

Digital Cameras.

Hand-Held Devices with 1 to 3 Cells of NiMH/NiCd Batteries.