Analog Devices

LTC3896 RSS Sample
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150V Low I, Synchronous Inverting DC/DC Controller

* 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

The LTC3896 is a high performance inverting DC/DC switching regulator controller that drives an all N-channel synchronous power MOSFET stage. It converts a wideranging positive input voltage source to a regulated negative output that can be as much as 60V below ground. The input can operate from a voltage as low as 4V and as high as 140V – |VOUT–|. The LTC3896 contains true ground-referenced RUN, PLLIN and PGOOD pins, eliminating the need for external discrete level-shifting components to interface with the LTC3896. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. The low 40μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3896 features a precision 0.8V reference and power good output indicator. The soft-start (SS) pin ramps the output voltage during start-up. Applications

* Automotive and Industrial Power Systems

* Telecommunications Power Supplies

* Distributed Power Systems

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