LTC3770

PRODUCTION

Fast No R_SENSE^™ Step-Down Synchronous Controller with Margining, Tracking and PLL

Part Models: 4
1ku List Price: Starting From $4.73

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Overview

Wide V_IN Range: 4V to 32V
±0.67% 0.6V Reference Voltage
Output Voltage Tracking Capability
Programmable Margining
Sense Resistor Optional
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t_ON(MIN) ≤ 100ns
Phase Lock Loop Frequency Synchronization
Powerful Dual N-Channel MOSFET Driver
Adjustable Cycle-by-Cycle Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Current Foldback Protection (Disabled at Start-Up)
Output Overvoltage Protection
Micropower Shutdown: I_Q < 30µA
Power Good Output Voltage Monitor Tracks the Reference Input Pin
Available in (5mm × 5mm) QFN and 28-Lead SSOP Packages

The LTC3770 is a synchronous step-down switching regulator controller with output voltage up/down tracking capability and voltage margining. Its advanced functions and high accuracy reference are ideal for powering high performance server, ASIC and computer memory systems.

The LTC3770 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. The operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-lock loop allows the IC to be synchronized to an external clock.

Fault protection is provided by an overvoltage comparator and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 32V to be stepped down to as low as a 0.6V output. Power supply sequencing is accomplished using an external soft-start timing capacitor.

Applications

Distributed Power Systems
Server Power Supply

Part Models: 4
1ku List Price: Starting From $4.73

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
LTC3770EG#PBF	28-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3770EG#TRPBF	28-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3770EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3770EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG
		PCN22_0171_Form Material_Report Delta Qualification Matrix
LTC3770EG#PBF	PRODUCTION
LTC3770EG#TRPBF	PRODUCTION
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3770EUH#PBF	PRODUCTION
LTC3770EUH#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
Oscillators 1
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTM4601A LTM4601A-1		12A μModule (Power Module) Regulators with PLL, Output Tracking and Margining

Tools & Simulations

LTspice 1

LTC3770 Demo Circuit - Fast No Rsense, Synchronous Step-Down Controller (12V to 2.5V at 10A)

Models for the following parts are available in LTspice:

LTC3770

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

LTC3770EUF Demo Board | Margining & Tracking, 5V ≤ VIN ≤ 28V, VOUT = 2.5V @ 10A

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Product Details

Demonstration circuit 774 is a high efficiency synchronous step-down DC/DC converter featuring the LTC3770EUH No R_SENSE controller. It operates with a 5V to 28V input voltage range and provides a 2.5V output at up to 10A.

Resources

DC774A - Demo Manual
9/24/2009

DC774A - Schematic
9/24/2009

DC774A - Design File
9/24/2009

Latest Discussions

2 Years Ago

LTC3770

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Press Release 1