LTC1709-85

PRODUCTION

2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator

Part Models: 2
1ku List Price: Starting From $5.19

Viewing:

Part Details

Output Stages Operate Antiphase Reducing Input Capacitance Requirements and Power Supply Induced Noise
Dual Input Supply Capability for Load Sharing
5-Bit VID Code (VRM 8.5): V_OUT = 1.05V to 1.825V
True Remote Sensing Differential Amplifier
Power Good Output Indicator
±1% Output Voltage Accuracy
Active Voltage Positioning Capable
Current Mode Control Ensures Current Sharing
OPTI-LOOP^® Compensation Minimizes C_OUT
Three Operational Modes: PWM, Burst and Cycle Skip
Programmable Fixed Frequency: 150kHz to 300kHz
Wide V_IN Range: 4V to 36V Operation
Adjustable Soft-Start Current Ramping
Internal Current Foldback and Short-Circuit Shutdown
Overvoltage Soft Latch Eliminates Nuisance Trips
Available in 36-Lead Narrow SSOP Package

The LTC1709-85 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives two all N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified.

An operating mode select pin (FCB) can be used to select among three modes including Burst Mode^® operation for highest efficiency. An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required in high current applications.

The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when the overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values.


	Vout Range	VRM
LTC1709	1.3V to 3.5V	VRM8.4
LTC1709-7	0.925V to 2V	Mobile
LTC1709-8	1.3V to 3.5V	VRM8.4
LTC1709-8.5	1.05V to 1.825V	VRM8.5
LTC1709-9	1.1V to 1.85V	VRM9.0

Applications

Server/Desktop Computers
Internet Servers
Large Memory Arrays
DC Power Distribution Systems

Part Models: 2
1ku List Price: Starting From $5.19

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
LTC1709EG-85#PBF	36-Lead SSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1709EG-85#TRPBF	36-Lead SSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Nov 18, 2019 - 19_0266 Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC
		PCN19_0266_Form Material_Report Detailed Parts List
LTC1709EG-85#PBF	PRODUCTION
LTC1709EG-85#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC1709
LTC1709-7
LTC1709-8
LTC1709-85
LTC1709-9

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.