FEATURES
n Charge Pump Input Range: 2.7V to 5.5V n Controller Input Range: 4V to 38V n Integrated Charge Pump Provides 5V Gate Drive to Logic Level MOSFETs n RSENSE or DCR Current Sensing n ±1.25% Output Voltage Accuracy Over Temperature n Phase-Lockable Fixed Frequency: 250kHz to 750kHz n Power Good Output Voltage Monitor n Adjustable Soft-Start Voltage Ramping n Current Foldback Disabled During Start-Up n No Reverse Current During Soft-Start n Selectable Constant Frequency, Pulse-Skipping, or Burst Mode Operation n Output Overvoltage Protection n Very Low Dropout Operation: 99% Duty Cycle n Available in a 24-Lead (3mm ¥ 5mm) QFN Package APPLICATIONS
n General Purpose 3.3V Systems n Lithium-Ion Powered Devices n Distributed DC Power Systems LTC3852 Low Input Voltage, Synchronous Step-Down DC/DC Controller DESCRIPTION
The LTC®3852 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 MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, and continuous current mode.
Linear Technology
