LTC3736-2

PRODUCTION

Dual 2-Phase, No RSENSE™, Synchronous Controller with Output Tracking

Analog Devices LTC3736-2 Product Info

10 February 2026 6

Features

No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required Input Capacitance
Tracking Function
Wide V_IN Range: 2.75V to 9.8V
0.6V ±1% Voltage Reference
High Current Limit
Constant Frequency Current Mode Operation
Low Dropout Operation: 100% Duty Cycle

True PLL for Frequency Locking or Adjustment
Selectable Pulse Skipping/Forced Continuous Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I_Q = 9μA
Tiny Low Profile (4mm × 4mm) QFN and narrow SSOP packages.

Part details & applications

The LTC3736-2 is a 2-phase dual synchronous step-down switching regulator controller with tracking that drives external complementary power MOSFETs using few external components. The constant-frequency current mode architecture with MOSFET V_DS sensing eliminates the need for 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.

Pulse-skipping operation provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems.

The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3736-2 switching frequency can be externally synchronized from 250kHz to 850kHz. An internal soft-start, which can be lengthened externally, smoothly ramps the output voltage during start-up.

The LTC3736-2 is available in the tiny thermally enhanced (4mm × 4mm) QFN and 24-lead narrow SSOP packages.


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