Analog Devices LTC3896

Description

The inverting buck/boost converter topology is an often mysterious and misunderstood category of DC-DC converters. This document attempts to remove any misconception around the circuit by providing a step-by-step design procedure with equations, schematics, simulations, and considerations to ensure that the circuit is properly designed.

Features

• Wide VIN + |VOUT–| Range: 4V to 140V (150V Abs Max)
• Wide Output Voltage Range: –60V to –0.8V
• Ground-Referenced Control / Interface Pins
• Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
• Integrated Bootstrap Diode
• Low Operating IQ: 40μA (Shutdown = 10μA)
• Selectable Gate Drive UVLO Thresholds
• Onboard LDO or External NMOS LDO for DRVCC
• EXTVCC LDO Powers Drivers from Output
• Phase-Lockable Frequency (75kHz to 850kHz)
• Programmable Fixed Frequency (50kHz to 900kHz)
• Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads
• Adjustable Burst Clamp and Current Limit
• Power Good Output Voltage Monitor
• Programmable Input Overvoltage Lockout
• 38-Lead TSSOP High Voltage Package

Typical applications

• Automotive and Industrial Power Systems, Telecommunications Power Supplies, Distributed Power Systems

More information

• Datasheet
• IC product information