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LT8709

Linear
Part Number LT8709
Manufacturer Linear
Description Negative Input Synchronous Multi-Topology DC/DC Controller
Published Mar 16, 2016
Detailed Description LT8709 Features Negative Input Synchronous Multi-Topology DC/DC Controller Description n Wide Negative Input Range: ...
Datasheet PDF File LT8709 PDF File

LT8709
LT8709

Overview
LT8709 Features Negative Input Synchronous Multi-Topology DC/DC Controller Description n Wide Negative Input Range: –4.
5V to –80V n Rail-to-Rail Output Current Monitor and Control n Input Voltage Regulation for High Impedance Inputs n Power Good Indication Pin n MODE Pin for Forced CCM (Continuous Conduction Mode) or Pulse-Skipping/DCM (Discontinuous Conduction Mode) Operation n Switching Frequency Up to 750kHz n Easily Configurable as a Buck, Boost, Buck-Boost, or Inverting Converter with a Single Feedback Pin n Can be Synchronized to an External Clock n High Gain EN/FBIN Pin Accepts Slowly Varying Input Signals n 20-Lead TSSOP Package Applications n High Power Negative Input, Negative Output Power Supplies n High Power Negative Input, Positive Output Power Supplies n Telecom Equipment Power Supplies n Cathodic Protection Power Supplies L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LT®8709 is a synchronous PWM controller for negativeto-negative or negative-to-positive DC/DC conversion, with rail-to-rail output current monitor and control.
The LT8709 is ideal for many local power supply designs.
It can be easily configured in buck, boost, buck-boost, and inverting topologies with negative input voltages.
In addition, the LT8709’s rail-to-rail output current sense allows the part to be configured in current limited applications such as battery or capacitor charging.
The PG pin is used for power good indication.
The LT8709’s switching frequency range can be set between 100kHz and 750kHz.
The part may be clocked internally at a frequency set by the resistor from the RT pin to the –VIN pin, or it may be synchronized to an external clock.
The LT8709 also features innovative EN/FBIN pin circuitry that allows for slowly varying input signals and an adjustable undervoltage lockout function.
The pin is also used as input ...


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