LT8709

RECOMMENDED FOR NEW DESIGNS

Negative Input Synchronous Multi-Topology DC/DC Controller

Data Sheet Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.37

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Part Details

Wide Negative Input Range: –4.5V to –80V
Rail-to-Rail Output Current Monitor and Control
Input Voltage Regulation for High Impedance Inputs
Power Good Indication Pin
MODE Pin for Forced CCM (Continuous Conduction Mode) or Pulse-Skipping/DCM (Discontinuous Conduction Mode) Operation
Switching Frequency Up to 750kHz
Easily Configurable as a Buck, Boost, Buck-Boost, or
Inverting Converter with a Single Feedback Pin
Can be Synchronized to an External Clock
High Gain EN/FBIN Pin Accepts Slowly Varying Input Signals
20-Lead TSSOP Package

Part Models: 4
1ku List Price: Starting From $4.37

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
LT8709EFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8709EFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8709IFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8709IFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	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
LT8709EFE#PBF	PRODUCTION
LT8709EFE#TRPBF	PRODUCTION
LT8709IFE#PBF	PRODUCTION
LT8709IFE#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
PowerPath, Ideal Diodes, and Load Switches 1
LTC4354	PRODUCTION	Negative Voltage Diode-OR Controller and Monitor

Parts	Product Life Cycle	Description
LT8710	RECOMMENDED FOR NEW DESIGNS	Synchronous SEPIC/Inverting/Boost Controller with Output Current Control

Tools & Simulations

LTspice 5

Models for the following parts are available in LTspice:

LT8709

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

LT8709EFE Demo Board | Negative Buck-Boost, -38V ≤ VIN ≤ -4.5V; VOUT = -12V @ 5A

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Product Details

Demonstration circuit 2148A features the LT8709, a negative input synchronous multi-topology DC/DC controller designed for negative input power supplies where the highest input supply voltage is ground. Examples of these circuits include negative buck, negative boost, negative buck-boost and negative inverting. The DC2148A is a negative buck-boost with an operating input voltage range from –4.5V to –38V and an output voltage of –12V, however this demo circuit can be easily reconfigured for other negative input topologies. The maximum output current for DC2148A is 5A, the switching frequency is 400kHz and the maximum efficiency with a –12V input is 91%.