LTC3548-2

PRODUCTION

Dual Synchronous, Fixed/Adjustable Output, 2.25MHz Step-Down DC/DC Regulator

Analog Devices LTC3548-2 Product Info

10 February 2026 4

Features

High Efficiency: Up to 95%
1.8V/800mA Fixed Output and 400mA Adjustable Output Voltage
Only 40μA Quiescent Current (Both Channels)
2.25MHz Constant Frequency Operation
High Switch Current Limits: 1.2A and 0.7A
No Schottky Diodes Required
Low R_DS(ON) Internal Switches: 0.35Ω

Current Mode Operation for Excellent Line and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I_Q < 1μA
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced 3mm × 3mm DFN Package

Part details & applications

The LTC3548-2 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1.2mm. For channel 1, the output voltage is fixed at 1.8V/800mA; for channel 2, the output voltage is adjustable from 0.6V to V_IN. Internal synchronous 0.35Ω, 1.2A/0.7A power switches provide high efficiency without the need for external Schottky diodes.

A user selectable mode input is provided to allow the user to trade-off noise ripple for low power efficiency. Burst Mode^® operation provides high efficiency at light loads, while Pulse-Skip Mode provides low noise ripple at light loads.

To further maximize battery run time, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40μA. In shutdown, the device draws <1μA.

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	Features
LTC3548A	Improved Burst Mode, Improved ESD, 2 Adjustable Outputs
LTC3548-2	One Fixed 1.8V Output, 1 Adjustable