The LTC3736 is a 2-phase dual synchronous step-down switching regulator controller with tracking that drives external complementary power MOSFETs using few exter- nal components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are significantly reduced.
The LTC3736 is a 2‑phase dual synchronous step‑down switching regulator controller that operates without current‑sense resistors. It offers features such as burst‑mode operation, 100 % duty‑cycle capability, internal soft‑start, and a true PLL for frequency locking or adjustment. The device can be synchronized to an external clock between 250 kHz and 850 kHz and is available in a tiny 4 mm × 4 mm QFN package or a 24‑lead narrow SSOP.
The datasheet details absolute maximum ratings, electrical characteristics, pin functions, and package dimensions. Typical performance graphs illustrate efficiency, load regulation, and switching frequency behavior. A typical application circuit and related part numbers are also included.
| Input Supply Voltage (Vin) range | -0.3 V to 10 V |
|---|---|
| Oscillator Frequency (unsynchronized) | 480 kHz – 600 kHz |
| Maximum Switching Frequency (synchronizable) | 250 kHz – 850 kHz |
| Top Gate (TG) Drive Rise Time | 40 ns |
| Package options | 4 mm × 4 mm QFN or 24‑lead narrow SSOP |
The device operates from –0.3 V up to 10 V on the Vin pin.
When synchronized to an external clock, the LTC3736 can run up to 850 kHz.
Yes, burst‑mode operation is provided for light‑load efficiency.
It is offered in a 4 mm × 4 mm QFN package and a 24‑lead narrow SSOP package.