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LTC3615

Linear Technology
Part Number LTC3615
Manufacturer Linear Technology
Description 3A Synchronous Step-Down DC/DC Converter
Published Jun 29, 2010
Detailed Description LTC3615/LTC3615-1 Features Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter Description n High Efficiency: Up to 9...
Datasheet PDF File LTC3615 PDF File

LTC3615
LTC3615

Overview
LTC3615/LTC3615-1 Features Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter Description n High Efficiency: Up to 94% n Dual Outputs with 2 × 3A Output Current Capability n Low Output Ripple Burst Mode® Operation: IQ = 130µA n 2.
25V to 5.
5V Input Voltage Range n ±1% Output Voltage Accuracy n Output Voltages Down to 0.
6V n Programmable Slew Rate at Switch Pins n Low Dropout Operation: 100% Duty Cycle n Shutdown Current ≤1µA n Adjustable Switching Frequency Up to 4MHz n Internal or External Compensation n Selectable Pulse-Skipping/Forced Continuous/ Burst Mode Operation with Adjustable Burst Clamp n Optional Active Voltage Positioning (AVP) with Internal Compensation n Selectable 0°/90°/180° (LTC3615) or selectable 140°/180° (LTC3615-1) Phase Shift Between Channels n Fixed Internal and Programmable External Soft-Start n Accurate Start-Up Tracking Capability n DDR Memory Mode IOUT = ±1.
5A n Available in 4mm × 4mm QFN-24 and TSSOP-24 Packages Applications n Point-of-Load Supplies n Distributed Power Supplies n Portable Computer Systems n DDR Memory Termination n Handheld Devices The LTC®3615/LTC3615-1 are dual 3A synchronous stepdown regulators using a current mode, constant-frequency architecture.
The DC supply current is only 130µA (Burst Mode operation at no-load) while maintaining the output voltages, dropping to zero current in shutdown.
The 2.
25V to 5.
5V input supply range makes the parts ideally suited for single Li-Ion applications.
100% duty cycle capability provides low dropout operation, which extends operating time in battery-operated systems.
The operating frequency is externally programmable up to 4MHz, allowing the use of small surface mount inductors.
0°, 90°, or 180° (LTC3615) or 140°/180° (LTC3615-1) of phase shift between the two channels can be selected to minimize input current ripple and output voltage ripple in a dual 3A or single 6A output configuration.
Programmable slew rate limiting reduces EMI, and external synchronization can be applie...


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