Six-Channel DC/DC Converters power portable devices.

Richtek Technology Corp. Jan 25, 2010

Press Release Summary:

Supplied in 40-lead VQFN package, RT9911 provides complete power-supply solution for hand-held devices. It integrates one selectable Boost/Buck DC-DC converter, one step-down DC-DC converter, one main step-up converter, one PWM converter for CCD positive voltage, one inverter for CCD negative voltage, and one white LED driver for LCD backlight. Each DC-DC converter has independent shutdown input, and RoHS-compliant product offers up to 1.4 MHz adjustable switching frequency.

Original Press Release:

RT9911: 6 Channel DC/DC Converters

General Description

The RT9911 is a complete power-supply solution for digital still cameras and other hand-held devices. It integrates one selectable Boost/Buck DC-DC converter, one high-efficiency step-down DC-DC converter, one high-efficiency main step-up converter, one PWM converter for CCD positive voltage, one inverter for CCD negative voltage and one white LED driver for LCD backlight. The RT9911 is targeted for applications that use either two or three primary cells or a single lithium-ion battery.

RT9911 is available in VQFN-40L 6x6. Each DC-DC converter has independent shutdown input.

Features

1.6V to 5.5V Battery Input Voltage Range

Synchronous Boost/Buck Selectable DC-DC Converter
- Internal Switches
- Up to 95% Efficiency

Syn-Buck DC-DC Converters
- 0.8V to 5.5V Adjustable Output Voltage
- Up to 95% Efficiency
- 100%(MAX) Duty Cycle
- Internal Switches

Main Boost DC-DC Converter
- Adjustable Output Voltage
- Up to 97% Efficiency

PWM Converter for CCD Positive Voltage

Inverter for CCD Negative Voltage

White LED Driver for LCD Panel Backlight

Up to 1.4MHz Adjustable Switching Frequency

1mA Supply Current in Shutdown Mode

External Compensation Network for all Converters

Independent Enable Pin to Shutdown Each Channel.

40-Lead VQFN Package