The LTC ®3709 is a single output, dual phase, synchronous step-down switching regulator that offers high efficiency and low power consumption.
The LTC3709 is a single‑output, dual‑phase synchronous step‑down switching regulator featuring PolyPhase® valley‑current control, optional sense‑resistor‑less operation, and a TRACK pin for output tracking or sequencing. It offers a wide supply range up to 31 V, 2 %‑90 % duty cycle at 200 kHz, and programmable current limit and soft‑start.
The document includes absolute maximum ratings, detailed electrical characteristics, typical performance graphs, pin‑function descriptions, package dimensions, a typical low‑ripple 12 V/25 A application, and a list of related parts. It is intended for designers needing precise data for circuit implementation and verification.
| Input Supply Voltage Range | 7 V to -0.3 V |
|---|---|
| Maximum Current Sense Threshold | 124 mV to 166 mV |
| Package Options | 32‑lead QFN (5 mm × 5 mm) or 36‑lead SSOP |
| Reference Voltage | 0.6 V ±1 % |
The TRACK pin is provided for tracking or sequencing the output voltage among several LTC3709 chips or other DC/DC regulators.
The operating frequency is selected by an external resistor and is compensated for variations in the input supply voltage.
The LTC3709 is offered in a 32‑lead QFN package (5 mm × 5 mm) and a 36‑lead SSOP package.