LTC3857-1
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LTC3857-1

Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

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LTspice LTC3857-1 - Step-Down (Buck) Regulators Download 5.48 KB
Part Models 4
1ku List Price Starting From $4.63
Features
  • Low Operating IQ: 50μA (One Channel On)
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
  • Wide VIN Range: 4V to 38V
  • RSENSE or DCR Current Sensing
  • Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • OPTI-LOOP® Compensation Minimizes COUT
  • Phase-Lockable Frequency (75kHz-850kHz)
  • Programmable Fixed Frequency (50kHz-900kHz)
  • Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start or Tracking
  • Power Good Output Voltage Monitor
  • Output Overvoltage Protection
  • Low Shutdown IQ: <8μA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-Up
  • Narrow SSOP Package
Additional Details
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The LTC3857-1 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and noise due to the ESR of the input capacitor ESR are minimized by operating the two controller output stages out of phase.

The 50μA no-load quiescent current extends operating life in battery-powered systems. The LTC3857-1 features a precision 0.8V reference and a power good output indicator. wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries.

Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

For a leadless 32-pin QFN package with the additional features of adjustable current limit, clock out, phase modulation and two PGOOD outputs, see the LTC3857 data sheet.


 LTC3857 LTC3857-1
Features   Adjustable Current Limit, Clock Output, Phase Modulation, 2 PGOOD Outputs Fixed Current Limit, One PGOOD Output
Package QFN-32   SSOP-28

Applications

  • Automotive Always-On Systems
  • Battery Operated Digital Devices
  • Distributed DC Power Systems
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LTspice LTC3857-1 - Step-Down (Buck) Regulators Download 5.48 KB
Part Models 4
1ku List Price Starting From $4.63
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LTC3857-1

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UPDATED 01/12/2012
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LTC3857-1: Low IQ, Dual, 2-Phase Synchronous Step-Down Controller Data Sheet

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UPDATED 04/05/2012
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LTC3857-1: 低消費電流、デュアル、2フェーズ同期整流式降圧コントローラ データシート

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UPDATED 03/26/2018
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Documentation

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

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LTC3857EGN-1#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3857IGN-1#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3857IGN-1#TRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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Aug 10, 2022

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Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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Jul 31, 2020

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

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Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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PRODUCTION

LTC3857EGN-1#TRPBF

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LTC3857IGN-1#PBF

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Material_Report

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Delta Qualification Matrix

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Jul 31, 2020

- 20_0245

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

LTC3857EGN-1#PBF

PRODUCTION

LTC3857EGN-1#TRPBF

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LTC3857IGN-1#PBF

PRODUCTION

LTC3857IGN-1#TRPBF

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PCN20_0245_Form

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Material_Report

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Delta Qualification Matrix

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Qualification Results Summary

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Evaluation Kit

Evaluation Kits 1

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DC1352A-A

LTC3857EGN-1 Demo Board | Dual Output, 2-Phase, Low Iq, 4.5V ≤ VIN ≤ 36V, VOUT1 = 3.3V @ 5A, VOUT2 = 8.5V @ 3A

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DC1352A-A

LTC3857EGN-1 Demo Board | Dual Output, 2-Phase, Low Iq, 4.5V ≤ VIN ≤ 36V, VOUT1 = 3.3V @ 5A, VOUT2 = 8.5V @ 3A

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DC1352A-A
LTC3857EGN-1 Demo Board | Dual Output, 2-Phase, Low Iq, 4.5V ≤ VIN ≤ 36V, VOUT1 = 3.3V @ 5A, VOUT2 = 8.5V @ 3A
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Product Detail

Demonstration circuit 1352A is a low quiescent current, dual output 2-phase, synchronous buck converter demo board featuring the LTC3857EGN-1 or LTC3858EGN-1. It features a 4.5V to 36V input voltage range and provides 3.3V / 5A and 8.5V / 3A outputs. Two versions of the board are available. The DC-1352A-A is for the LTC3857EGN-1, which offers lower quiescent current and smaller burst mode ripple, while the DC1352A-B is for the LTC3858EGN-1 which offers latch-off protection and increased burst mode efficiency.



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DC1352A - Schematic Download

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DC1352A - Demo Board Download

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DC1352A - Design Files Download

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Evaluation Kits1

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DC1352A-A

LTC3857EGN-1 Demo Board | Dual Output, 2-Phase, Low Iq, 4.5V ≤ VIN ≤ 36V, VOUT1 = 3.3V @ 5A, VOUT2 = 8.5V @ 3A
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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LTC3857-1 - Step-Down (Buck) Regulators Download

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