LTC3809-1

PRODUCTION

No RSENSE™, Low Input Voltage, Synchronous DC/DC Controller with Output Tracking

Analog Devices LTC3809-1 Product Info

10 February 2026 5

Features

Programmable Output Voltage Tracking
No Current Sense Resistor Required
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
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
Selectable Maximum Peak Current Sense Threshold
Output Overvoltage Protection
Micropower Shutdown: I_Q = 9µA
Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN or 10-lead MSOP Packages

Part details & applications

The LTC3809-1 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.

Optional Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation, extending operating time in battery-powered systems. Burst Mode is inhibited when the MODE pin is pulled low to reduce noise and RF interference.

The LTC3809-1 allows either coincident or ratiometric output voltage tracking. Switching frequency is fixed at 550kHz. Fault protection is provided by an overvoltage comparator and a short-circuit current limit comparator.

The LTC3809-1 is available in 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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