LTC3838-2

RECOMMENDED FOR NEW DESIGNS

Dual, Fast, Accurate Step-Down DC/DC Controller with External Reference Voltage and Dual Differential Output Sensing

Analog Devices LTC3838-2 Product Info

10 February 2026 5

Features

Wide V_IN Range: 4.5V to 38V
V_OUT1: 0.6V to 5.5V, ±0.67% Output Regulation Accuracy, with Internal 0.6V V_REFERENCE
V_OUT2: 0.4V to 5.5V, ±4mV Regulation Accuracy, with Differential External V_REFERENCE Sensing
Differential Remote Output Sensing; Up to ±500mV (V_OUT1) and ±200mV (V_OUT2) Ground Deviations
Fast Load Transient Response Without Clock Delay

Detect Transient Release (DTR) Reduces V_OUTOvershoot
Frequency Programmable from 200kHz to 2MHz, Synchronizable to External Clock
t_ON(MIN) = 30ns, t_OFF(MIN) = 90ns
R_SENSE or Inductor DCR Current Sensing
Overvoltage Protection and Current Limit Foldback
Power Good Output Voltage Monitor
Thermally Enhanced 38-Pin (5mm × 7mm) QFN Package

Part details & applications

The LTC3838-2 is a dual-channel, PolyPhase^® synchronous step-down DC/DC switching regulator controller. Two independent channels drive all N-channel power MOSFETs. The two channels can also be combined into a multiphase single output configuration with external reference.

The controlled on-time, valley current mode control architecture allows for not only fast response to transients without a clock delay, but also constant frequency switching at a steady-load condition. Its proprietary load-release transient detection feature (DTR) significantly reduces overshoot at low output voltages.

The switching frequency can be programmed from 200kHz to 2MHz with an external resistor, and can be synchronized to an external clock. Very low t_ON and t_OFF times allow for near 0% and near 100% duty cycles, respectively. Voltage tracking soft start-up and multiple safety features are provided.

See below for a comparison of LTC3838, LTC3838-1 and LTC3838-2.


Part Number	Description
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