LTC3851A-1
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LTC3851A-1

Synchronous Step-Down Switching Regulator Controller

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Info: : PRODUCTION tooltip
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Part Details
Part Models 12
1ku List Price Starting From $2.09
Features
  • Wide VIN Range: 4V to 38V Operation
  • RSENSE or DCR Current Sensing
  • ±1% Output Voltage Accuracy
  • Power Good Output Voltage Monitor
  • Phase-Lockable Fixed Frequency: 250kHz to 750kHz
  • Dual N-Channel MOSFET Synchronous Drive
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start or Tracking
  • Output Current Foldback Limiting
  • Output Overvoltage Protection
  • OPTI-LOOP® Compensation Minimizes COUT
  • Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads
  • Low Shutdown IQ: 20μA
  • VOUT Range: 0.8V to 5.5V
  • Thermally Enhanced 16-Lead MSOP or 3mm × 3mm QFN Package
Additional Details
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The LTC3851A-1 is a high performance synchronous step-down switching regulator controller that drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz.

OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3851A-1 features a precision 0.8V reference and a power good indicator. A wide 4V to 38V (40V absolute maximum) input supply range encompasses most battery configurations and intermediate bus voltages.

The TK/SS pin ramps the output voltage during start-up and shutdown with coincident or ratiometric tracking. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode operation, pulse-skipping mode or continuous inductor current mode at light loads and allows the IC to be synchronized to an external clock. The LTC3851A-1 contains an improved PLL compared to the LTC3851-1.

The LTC3851A-1 is identical to the LTC3851A except that the ILIM pin is replaced by PGOOD.

Features
LTC3851 Not Recommended For New Designs
LTC3851-1 Not Recommended For New Designs
LTC3851A Adjustable Current Limit
LTC3851A-1 PGOOD Output

Applications

  • Automotive Systems
  • Telecom Systems
  • Industrial Equipment
  • Distributed DC Power Systems
Part Models 12
1ku List Price Starting From $2.09

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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LTC3851AHMSE-1#PBF
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LTC3851AHMSE-1#TRPBF
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LTC3851AIMSE-1#PBF
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LTC3851AIMSE-1#TRPBF
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LTC3851AIUD-1#PBF
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LTC3851AMPMSE-1#PBF
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Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

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PRODUCTION

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PRODUCTION

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PRODUCTION

Nov 8, 2021

- 20_0245

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC3851AEMSE-1#PBF

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LTC3851AEMSE-1#TRPBF

PRODUCTION

LTC3851AEUD-1#PBF

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LTC3851AEUD-1#TRPBF

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PRODUCTION

Feb 4, 2020

- 20_0132

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3851AEMSE-1#PBF

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LTC3851AEMSE-1#TRPBF

PRODUCTION

LTC3851AHMSE-1#PBF

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LTC3851AHMSE-1#TRPBF

PRODUCTION

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LTC3851AMPMSE-1#PBF

PRODUCTION

LTC3851AMPMSE-1#TRPBF

PRODUCTION

Apr 18, 2022

- 22_0050

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

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Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC3851AEMSE-1#PBF

PRODUCTION

LTC3851AEMSE-1#TRPBF

PRODUCTION

LTC3851AHMSE-1#PBF

PRODUCTION

LTC3851AHMSE-1#TRPBF

PRODUCTION

LTC3851AIMSE-1#PBF

PRODUCTION

LTC3851AIMSE-1#TRPBF

PRODUCTION

LTC3851AMPMSE-1#PBF

PRODUCTION

LTC3851AMPMSE-1#TRPBF

PRODUCTION

Nov 8, 2021

- 20_0245

arrow down

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC3851AEMSE-1#PBF

PRODUCTION

LTC3851AEMSE-1#TRPBF

PRODUCTION

LTC3851AEUD-1#PBF

PRODUCTION

LTC3851AEUD-1#TRPBF

PRODUCTION

LTC3851AHMSE-1#PBF

PRODUCTION

LTC3851AHMSE-1#TRPBF

PRODUCTION

LTC3851AIMSE-1#PBF

PRODUCTION

LTC3851AIMSE-1#TRPBF

PRODUCTION

LTC3851AIUD-1#PBF

PRODUCTION

LTC3851AIUD-1#TRPBF

PRODUCTION

LTC3851AMPMSE-1#PBF

PRODUCTION

LTC3851AMPMSE-1#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0132

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Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3851AEMSE-1#PBF

PRODUCTION

LTC3851AEMSE-1#TRPBF

PRODUCTION

LTC3851AHMSE-1#PBF

PRODUCTION

LTC3851AHMSE-1#TRPBF

PRODUCTION

LTC3851AIMSE-1#PBF

PRODUCTION

LTC3851AIMSE-1#TRPBF

PRODUCTION

LTC3851AMPMSE-1#PBF

PRODUCTION

LTC3851AMPMSE-1#TRPBF

PRODUCTION

Apr 18, 2022

- 22_0050

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC1432A-B

LTC3851AEUD-1 Demo Board with PGood Signal | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

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DC1432A-B

LTC3851AEUD-1 Demo Board with PGood Signal | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

LTC3851AEUD-1 Demo Board with PGood Signal | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

Product Detail

Demonstration circuit 1432A is a synchronous buck controller featuring the LTC3851AEUD/LTC3851AEUD-1. It operates with an input voltage from 4.5V to 14V and provides 1.5V at up to 15A at the output. The demo circuit is available in two versions. DC1432A-A is configured with LTC3851AEUD which provides ISET function, while the DC1432A-B is configured with LTC3851AEUD-1 which provides PGOOD function.

Tools & Simulations

Tools & Simulations 2

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.

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