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