KB3511

Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 KB3511 System-Power High Efficiency, Low Noise, Fast Transient Dual 800mA, 2.2MHz Step-Down DC/DC Converter FEATURES Up to 97% Efficiency 25uA No Load Current Per Channel www.DataSheet4U.com ■ 800mA Output Current ■ 2.5V to 6.5V Input Voltage Range ■ 2.2MHz Constant Frequency Operation ■ No Schottky Diode Required ■ Low Dropout Operation: 100% Duty Cycle ■ 0.6V Reference Allows Low Output Voltages ■ Shutdown Mode Draws ) 1µA Supply Current ■ Current Mode Operation for Excellent Line and Load Transient Response ■ Overtemperature Protected ■ DFN33-10 Package ■ ■ DESCRIPTION The KB3511 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.8V and 3.3V. Supply current during operation is only 25µA and drops to ) 1µA in shutdown. The 2.5V to 6.5V input voltage range makes the KB3511 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic Trickle Mode operation increases efficiency at light loads, further extending battery life. Switching frequency is internally set at 2.2MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output volt...