LTC1735-1

PRODUCTION

High Efficiency Synchronous Step-Down Switching Regulator

Part Models: 8
1ku List Price: Starting From $4.46

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Part Details

Dual N-Channel MOSFET Synchronous Drive
Programmable/Synchronizable Fixed Frequency
V_OUT Range: 0.8V to 7V
Wide V_IN Range: 3.5V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
OPTI-LOOP^™ Compensation Minimizes C_OUT
±1% Output Voltage Accuracy
Power Good Output Voltage Monitor
Internal Current Foldback
Output Overvoltage Crowbar Protection
Latched Short-Circuit Shutdown Timer with Defeat Option
Optional Programmable Soft-Start
Remote Output Voltage Sense
Logic Controlled Micropower Shutdown: I_Q < 25µA
Available in 16-Lead Narrow SSOP and SO Packages

The LTC1735-1 is a synchronous step-down switching regulator controller optimized for CPU power. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.

The operating frequency (synchronizable up to 500kHz) is set by an external capacitor allowing maximum flexibility in optimizing efficiency. The output voltage is monitored by a power good window comparator that indicates when the output is within 7.5% of its programmed value, conforming to Intel Mobile CPU Specifications.

Protection features include internal foldback current limiting, output overvoltage crowbar and optional short-circuit shutdown. Soft-start is provided by an external capacitor that can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum).

Pin defeatable Burst Mode^™ operation provides high efficiency at low load currents while 99% duty cycle provides low dropout operation.


	Features
LTC1735	-
LTC1735-1	Power Good

Applications

Notebook and Palmtop Computers, PDAs
Power Supply for Mobile Pentium^® III Processor with SpeedStep^™ Technology
Cellular Telephones and Wireless Modems

Part Models: 8
1ku List Price: Starting From $4.46

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
LTC1735CGN-1#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1735CGN-1#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1735CS-1#PBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1735CS-1#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1735IGN-1#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1735IGN-1#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1735IS-1#PBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1735IS-1#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN
No Match Found
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package
		PCN22_0235_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1735CGN-1#PBF	PRODUCTION
LTC1735CGN-1#TRPBF	PRODUCTION
LTC1735IGN-1#PBF	PRODUCTION
LTC1735IGN-1#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG]
		PCN22_0066_Form Material_Report Delta Qualification Matrix
LTC1735CGN-1#PBF	PRODUCTION
LTC1735CGN-1#TRPBF	PRODUCTION
LTC1735IGN-1#PBF	PRODUCTION
LTC1735IGN-1#TRPBF	PRODUCTION
Aug 6, 2022 - 22_0173 Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]
		PCN22_0173_Form Material_Report Delta Qualification Matrix
LTC1735CS-1#PBF	PRODUCTION
LTC1735CS-1#TRPBF	PRODUCTION
LTC1735IS-1#PBF	PRODUCTION
LTC1735IS-1#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Buck Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Circuit Monitors 2
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Oscillators 1
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC1735
LTC1735-1

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

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

LTC1735CGN-1 | Mobile Pentium III DC/DC Converter, 4.5 to 24VIN, 1.3 to 1.55VOUT @ 12A

Buy Now View Details

Product Details

DC267A: Demo Board for the LTC1735-1 High Efficiency Synchronous Step-Down Switching Regulator.

Resources

DC267A - Design File
9/24/2009

DC267A - Schematic
9/24/2009

DC267A - Demo Manual
9/24/2009

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Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 4

Technical Articles 1