LTC3896 Series

150V Low IQ, Synchronous Inverting DC/DC Controller

Catalog

150V Low IQ, Synchronous Inverting DC/DC Controller

Part	Frequency - Switching [Max]	Frequency - Switching [Min]	Supplier Device Package	Package / Case [custom]	Package / Case	Package / Case	Package / Case [custom]	Function	Output Configuration	Duty Cycle (Max) [Max]	Output Phases	Output Type	Topology	Operating Temperature [Max]	Operating Temperature [Min]	Control Features	Mounting Type	Number of Outputs	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]
Analog Devices LTC3896HFE#TRPBF	900 kHz	50 kHz	38-TSSOP-EP	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Step-Up/Step-Down	Negative	99 %	1	Transistor Driver	Buck-Boost	150 °C	-40 °C	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Surface Mount	1	140 V	4 V
Analog Devices LTC3896IFE#PBF	900 kHz	50 kHz	38-TSSOP-EP	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Step-Up/Step-Down	Negative	99 %	1	Transistor Driver	Buck-Boost	125 ¯C	-40 °C	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Surface Mount	1	140 V	4 V
Analog Devices LTC3896EFE#TRPBF	900 kHz	50 kHz	38-TSSOP-EP	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Step-Up/Step-Down	Negative	99 %	1	Transistor Driver	Buck-Boost	125 ¯C	-40 °C	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Surface Mount	1	140 V	4 V

Catalog

150V Low IQ, Synchronous Inverting DC/DC Controller

Key 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

• EXTVCCLDO 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

Description

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.ApplicationsAutomotive and Industrial Power SystemsTelecommunications Power SuppliesDistributed Power Systems