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LTC3835 - Low IQ Synchronous Step-Down Controller

Features

  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
  • Low Operating Quiescent Current: 80μA
  • OPTI-LOOP® Compensation Minimizes COUT
  • 1% Output Voltage Accuracy
  • Wide VIN Range: 4V to 36V Operation
  • Phase-Lockable Fixed Frequency 140kHz to 650kHz
  • Dual N-Channel MOSFET Synchronous Drive
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start or Tracking
  • Output Current Foldback Limiting
  • Power Good Output Voltage Monitor
  • Clock Output for PolyPhase® Applications
  • Output Overvoltage Protection
  • Low Shutdown IQ: 10μA
  • Internal LDO Powers Gate Drive from VIN or VOUT
  • Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads
  • Small 20-Lead TSSOP or 4mm × 5mm QFN Package

Typical Application

LTC3835 Typical Application
LTC3835 Typical Application

Description

The LTC3835 is a high performance 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 650kHz.

The 80μA no-load quiescent current extends operating life in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3835 features a precision 0.8V reference and a power good output indicator. The 4V to 36V input supply range encompasses a wide range of battery chemistries.

The TRACK/SS pin ramps the output voltage during startup. Current foldback limits MOSFET heat dissipation during short-circuit conditions.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

TSSOP-20, QFN-20

LTC3835 Package Drawing
LTC3835 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3835EDHC-1 DFN 16 E $4.86 $3.40 View
LTC3835EDHC-1#PBF DFN 16 E $4.86 $3.40 View
LTC3835EDHC-1#TR DFN 16 E $3.46 View
LTC3835EDHC-1#TRPBF DFN 16 E $3.46 View
LTC3835EFE TSSOP 20 E $5.07 $3.55 View
LTC3835EFE#PBF TSSOP 20 E $5.07 $3.55 View
LTC3835EFE#TR TSSOP 20 E $3.61 View
LTC3835EFE#TRPBF TSSOP 20 E $3.61 View
LTC3835EGN-1 SSOP 16 E $4.86 $3.40 View
LTC3835EGN-1#PBF SSOP 16 E $4.86 $3.40 View
LTC3835EGN-1#TR SSOP 16 E $3.46 View
LTC3835EGN-1#TRPBF SSOP 16 E $3.46 View
LTC3835EUFD QFN 20 E $5.07 $3.55 View
LTC3835EUFD#PBF QFN 20 E $5.07 $3.55 View
LTC3835EUFD#TR QFN 20 E $3.61 View
LTC3835EUFD#TRPBF QFN 20 E $3.61 View
LTC3835IDHC-1#PBF DFN 16 I $6.00 $4.20 View
LTC3835IDHC-1#TRPBF DFN 16 I $4.26 View
LTC3835IFE#PBF TSSOP 20 I $6.14 $4.30 View
LTC3835IFE#TRPBF TSSOP 20 I $4.36 View
LTC3835IGN-1#PBF SSOP 16 I $6.00 $4.20 View
LTC3835IGN-1#TRPBF SSOP 16 I $4.26 View
LTC3835IUFD#PBF QFN 20 I $6.14 $4.30 View
LTC3835IUFD#TRPBF QFN 20 I $4.35 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC965A LTC3835EGN | Low Iq, 36Vin Synchronous Step-Down C $125.00
DC967B LTC3835EFE Demo Board | Low Iq, Synchronous Step-D Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Automotive Systems
  • Telecom Systems
  • Battery-Operated Digital Devices
  • Distributed DC Power Systems

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LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

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Related models available in LTspice IV
LTC3835-1
LTC3835

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