LTC3737

The LTC3737 is a 2-phase dual step-down switching regulator controller that requires few external components. The constant frequency current mode architecture provides excellent AC and DC load and line regulation. MOSFET V_DS sensing eliminates the need for current sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are minimized by operating the two controllers out of phase.

Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation and extends battery operating time.

Switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3737 can be externally synchronized from 250kHz to 850kHz.

Other features include a power good output voltage monitor, a tracking input and internal soft-start.

The LTC3737 is available in the low profile thermally enhanced (4mm × 4mm) QFN package or a 24-lead SSOP narrow package.

Protected by U.S. Patents, including 5481178, 5731694, 5929620, 6144194, 6580258, 5994885

Applications

• One or Two Lithium-Ion Powered Devices
• Notebook and Palmtop Computers, PDAs
• Portable Instruments
• Distributed DC Power Systems