RT9907应用电路及参数资料

RT9907应用电路及参数资料

3 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down

The RT9907 is a three channel power-supply solution for digital still cameras and other battery-powered devices. It integrates an asynchronous step-up and two synchronous step-down DC-DC converters. The RT9907 is targeted for applications that use two AA cells or a single lithium-ion battery.

Features

1.5V to 5.5V Battery Input Voltage Range
Main step-up DC-DC Converter
1.5V to 5.5V Adjustable Output Voltage
Up to 90% Efficiency
2.6A, 0.3W Internal Power Switch
Two Step-Down DC-DC Converters
0.8V to 5.5V Adjustable Output Voltage
94% Efficiency
100% Duty Cycle
Up to 1.4MHz Switching Frequency
1uA Supply Current in Shutdown Mode
Programmable Soft Start Function
Independent Enable Pin (CH1, CH2, CH3)
External Compensation Network (CH1, CH2, CH3)
Short Circuit Protection (CH1, CH2, CH3)
Over Voltage Protection (CH2)
24-Lead VQFN Package
RoHS Compliant and 100% Lead (Pb)-Free

Application

Digital Still Camera
PDAs
Portable Device

Typical Applications Circuit

1-cell Li+ Battery 3.4V to 4.2V

Figure 1. Typical Application Circuit for 1-cell Li+ Battery

2-AA Battery 1.8V to 3.2V

Figure 2. Typical Application Circuit for 2-AA Battery Supply