器件名称:
LTC3852
功能描述:
LTC3852是一款恒定频率、电流模式、降压型 DC/DC 控制器，可由一个板上充电泵来供电。输入电源电压低至 2.7V，当利用充电泵实现倍增时可向 LTC3852 的控制逻辑电路及栅极驱动器提供 5V 电压，因而能支持各种各样的逻辑电平 N 沟道功率 MOSFET。
文件大小:
419.23KB 共32页
简 介:
FEATURES n n n n n n n n n n n n n n LTC3852 Low Input Voltage, Synchronous Step-Down DC/DC Controller DESCRIPTION The LTC3852 is a constant frequency, current mode step-down DC/DC controller which can be powered by an onboard charge pump. Input supplies as low as 2.7V, when doubled by the charge pump, provide 5V to the LTC3852’s control logic and gate drives, supporting a wide selection of logic-level N-channel power MOSFETs. The constant-frequency current mode architecture allows for a phase-lockable xed frequency of up to 750kHz. The RUN pin provides a precision enable threshold while the TRACK/SS pin combines tracking and adjustable soft-start features. The MODE/PLLIN pin selects among Burst Mode operation, pulse-skipping mode, and continuous current mode. Current foldback limits MOSFET power dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start. A power good output pin indicates when the output is within ±10% of its designed set point. L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 6498466, 6580258, 6611131. Charge Pump Input Range: 2.7V to 5.5V Controller Input Range: 4V to 38V Integrated Charge Pump Provides 5V Gate Drive to Logic Level MOSFETs RSENSE or DCR Current……
