LTC3835

PRODUCTION

Low I_Q Synchronous Step-Down Controller

Data Sheet (Rev. F) Product Selection Table

Part Models: 12
1ku List Price: Starting From $4.89

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Overview

Wide Output Voltage Range: 0.8V ≤ V_OUT ≤ 10V
Low Operating Quiescent Current: 80μA
OPTI-LOOP^® Compensation Minimizes C_OUT
1% Output Voltage Accuracy
Wide V_IN 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 I_Q: 10μA
Internal LDO Powers Gate Drive from V_IN or V_OUT
Selectable Continuous, Pulse-Skipping or Burst Mode^® Operation at Light Loads
Small 20-Lead TSSOP or 4mm × 5mm QFN Package
AEC-Q100 Qualified for Automotive Applications

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.

Comparison of LTC3835 and LTC3835-1
PART #	CLKOUT/PHASMD	EXTV_CC	PGOOD	PACKAGES
LTC3835	Yes	Yes	Yes	FE20/4 × 5 QFN
LTC3835-1	No	No	No	GN16/3 × 5 DFN

Applications

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

All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5408150, 5481178, 5705919, 5929620, 6304066, 6498466, 6580258, 6611131.

Part Models: 12
1ku List Price: Starting From $4.89

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.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3835EFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835EFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835EUFD#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835EUFD#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835EUFD#WPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835EUFD#WTRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835IFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835IFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835IUFD#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835IUFD#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835IUFD#WPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3835IUFD#WTRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LTC3835EFE#PBF	PRODUCTION
LTC3835EFE#TRPBF	PRODUCTION
LTC3835IFE#PBF	PRODUCTION
LTC3835IFE#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Oscillators 2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Protection Switches & Controllers 2
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode

LTC2955

RECOMMENDED FOR NEW DESIGNS

Pushbutton On/Off Controller with Automatic Turn-On

Tools & Simulations

LTspice 1

LTC3835 Demo Circuit - Low IQ Synchronous Step-Down Controller (4.5-32V to 3.3V @ 5A)

Models for the following parts are available in LTspice:

LTC3835
LTC3835-1

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

LTC3835EFE Demo Board | 4.5V ≤ VIN ≤ 36V, VOUT = 3.3V @ 5A

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Product Details

Demonstration circuit 967B is a single output high frequency step-down DC/DC controller featuring the low quiescent current LTC3835 in a 20-pin exposed pad TSSOP package. The DC967B is designed to generate a regulated 3.3V@5A output from 4.5V to 36V input voltage.

Resources

DC967B - Demo Manual
5/3/2010

DC967B - Schematic
5/3/2010

DC967B - Design Files
5/3/2010

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