LTC3838-1

RECOMMENDED FOR NEW DESIGNS

Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing

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Overview

  • Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V
  • Two Independent Channels: Dual/Single Output
  • Output Voltage Regulation Accuracy: ±0.67% (VOUT1) and ±0.75% (VOUT2) Over Temperature
  • Differential Remote Output Sensing: Up to ±500mV (VOUT1) and ±200mV (VOUT2) Ground Deviations
  • Controlled On-Time, Valley Current Mode Control
  • Fast Load Transient Response Without Clock Delay
  • Detect Transient Release (DTR) Reduces VOUT Overshoot
  • Frequency Programmable from 200kHz to 2MHz, Synchronizable to External Clock
  • tON(MIN) = 30ns, tOFF(MIN) = 90ns
  • RSENSE or Inductor DCR Current Sensing
  • Overvoltage Protection and Current Limit Foldback
  • Power Good Output Voltage Monitor
  • Output Voltage Tracking and Adjustable Soft Start-Up
  • Thermally Enhanced 38-Pin (5mm × 7mm) QFN Package

The LTC3838-1 is a dual-channel, PolyPhase® synchronous step-down DC/DC switching regulator controller. Two independent channels drive all N-channel power MOSFETs. The controlled on-time, valley current mode control architecture allows for not only fast response to transients without clock delay, but also constant frequency switching at steady load condition. Its proprietary load-release transient detection feature (DTR) significantly reduces overshoot at low output voltages.

A precision internal reference enables accurate differential output regulation. The dual channels can either provide two independent output voltages, or be combined into multiphase single-output configuration.

The switching frequency can be programmed from 200kHz to 2MHz with an external resistor and can be synchronized to an external clock. Very low tON and tOFF 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
LTC3838 ±0.67% Differential Output Voltage Accuracy Over Temperature on Channel 1, ±1% Output Regulation on Channel 2, Separate Per Channel 30mV to 100mV Current Sense Range Controls
LTC3838-1 ±0.67% Differential Output Voltage Accuracy Over Temperature on Both Channel 1 and Channel 2, Single Pin 30mV/60mV Current Sense Range Controls
LTC3838-2 ±0.67% Differential Output Voltage Accuracy With Internal Reference on Channel 1, ±4mV Differential with External Reference Voltage on Channel 2, Fixed 30mV Current Sense Range

Applications

  • Distributed Power Systems; Power Supply for ASIC
  • Computing, Data Storage, Communication Systems
  • Low Voltage, High Current, and/or High Step-Down Ratio Converters That Demand Tight Load Transient Regulation
LTC3838-1
Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing
1.2V/1.5V, 15A, 350kHz Step-Down Converter (Refer to Figure 16 for Complete Design) Efficiency/Power Loss Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

  • LTC3838
  • LTC3838-1
  • LTC3838-2

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

  • LTC3838
  • LTC3838DC1626A-ADCRSENSE
  • LTC3838DC1626A-BRSENSE
  • LTC3838DC1801A-BDEMOBOARDRSENSE
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC1997A-A

LTC3838EUHF-1 Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1 = 1.5V @ 20A, VOUT2 = 1.2V @ 20A

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Product Details

Demonstration circuit DC1997A is a dual output synchronous buck converters featuring the LTC3838EUHF-1 (DC1997A-A) or the  LTC3838EUHF-2 (DC1997A-B). Both assemblies provide two outputs of 1.5V/20A and 1.2V/20A over an input voltage range of 4.5V to 14V at a switching frequency of 300kHz. The LTC3838-1 and LTC3838-2 provide dual differential VOUT sensing while the dual LTC3838 (plain) has differential VOUT sensing on one channel. The "-2" version has an external reference input for channel 2.
DC1997A-A
LTC3838EUHF-1 Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1 = 1.5V @ 20A, VOUT2 = 1.2V @ 20A
DC1997A-A - Schematic

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