LTC3822

PRODUCTION

No RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller

Analog Devices LTC3822 Product Info

10 February 2026 5

Features

No Current Sense Resistor Required
All N-Channel MOSFET Synchronous Drive
High Current Outputs Possible
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
V_IN: 2.75V to 4.5V
±1% 0.6V Reference
Low Dropout Operation: 99% Duty Cycle
Selectable Frequency (300kHz/550kHz/750kHz)

Internal Soft-Start Circuitry
Selectable Maximum Peak Current Sense Threshold
Digital RUN Control Pin
Output Overvoltage Protection
Micropower Shutdown: I_Q = 7.5µA
Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN or 10-Lead MSOP Package

Part details & applications

The LTC3822 is a synchronous step-down switching regulator controller that drives external N-channel 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.

A maximum duty cycle of 99% provides low dropout operation. The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors.

The LTC3822 is available in thermally enhanced DFN and 10-lead MSOP packages.

	Features
LTC3822	Internal soft-start, 340μA in sleep mode
LTC3822-1	External soft start, selectable pulse skip/Burst Mode operation, tracking, phase lockable, power good (SSOP-16 package only), 105μA in sleep mode

Applications

3.3V_IN Systems
Li-Ion Battery Systems

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