FEATURES LTC3633A-2/LTC3633A-3
Dual Channel 3A, 20V
Monolithic Synchronous
Step-Down Regulator
DESCRIPTION n n n n n n n The LTC®3633A-2 is a high efficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time,
current mode architecture, with phase lockable switching
frequency. The two channels can run 180° out of phase to
relax the requirements for input and output capacitance. The
operating supply voltage range is from 3.6V to 20V, making
it suitable for lithium-ion battery stacks as well as point of
load power supply applications from a 12V or 5V supply. n n n n n n 3.6V to 20V Input Voltage Range
3A Output Current per Channel
Up to 95% Efficiency
Low Duty Cycle Operation: 5% at 2.25MHz
Selectable 0°/180° Phase Shift Between Channels
Adjustable Switching Frequency: 500kHz to 4MHz
External Frequency Synchronization
Current Mode Operation for Excellent Line and
Load Transient Response
0.6V Reference Allows Low Output Voltages
User Selectable Burst Mode® Operation or Forced
Continuous Operation
Output Voltage Tracking and Soft-Start Capability …