LTC3809

PRODUCTION

No RSENSE™, Low EMI, Synchronous DC/DC Controller

Analog Devices LTC3809 Product Info

10 February 2026 5

Features

No Current Sense Resistor Required
Selectable Spread Spectrum Frequency Modulation for Low Noise Operation
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
True PLL for Frequency Locking or Adjustment (Frequency Range: 250kHz to 750kHz)
Wide V_IN Range: 2.75V to 9.8V
Wide V_OUT Range: 0.6V to V_IN

0.6V ±1.5% Reference
Low Dropout Operation: 100% Duty Cycle
Selectable Burst Mode^®/Pulse-Skipping/Forced Continuous Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Output Overvoltage Protection
Micropower Shutdown: I_Q = 9µA
Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN and 10-lead MSOP Packages

Part details & applications

The LTC3809 is a synchronous step-down switching regulator controller 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 a current sense resistor and improves efficiency.

For noise sensitive applications, the LTC3809 can be externally synchronized from 250kHz to 750kHz. Burst Mode is inhibited during synchronization or when the SYNC/MODE pin is pulled low to reduce noise and RF interference. To further reduce EMI, the LTC3809 incorporates a novel spread spectrum frequency modulation technique.

Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle 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.

The LTC3809 is available in the tiny footprint thermally enhanced DFN and 10-lead MSOP packages.

	Features	Package
LTC3809	PLL, Selectable Spread Spectrum, Power Good	3x3 DFN-10, MS-10E
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