LTC3895 Series

150V Low IQ, Synchronous Step-Down DC/DC Controller

Catalog

150V Low IQ, Synchronous Step-Down DC/DC Controller

Part	Function	Frequency - Switching [Max]	Frequency - Switching [Min]	Output Type	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Topology	Package / Case [custom]	Package / Case	Package / Case	Package / Case [custom]	Control Features	Output Configuration	Output Phases	Number of Outputs	Duty Cycle (Max) [Max]	Supplier Device Package	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]
Analog Devices LTC3895HFE	Step-Down	900 kHz	50 kHz	Transistor Driver	Surface Mount	150 °C	-40 °C	Buck	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Positive	1	1	100 %	38-TSSOP-EP	140 V	4 V
Analog Devices LTC3895HFE#PBF	Step-Down	900 kHz	50 kHz	Transistor Driver	Surface Mount	150 °C	-40 °C	Buck	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Positive	1	1	100 %	38-TSSOP-EP	140 V	4 V
Analog Devices LTC3895IFE#TRPBF	Step-Down	900 kHz	50 kHz	Transistor Driver	Surface Mount	125 ¯C	-40 °C	Buck	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Positive	1	1	100 %	38-TSSOP-EP	140 V	4 V
Analog Devices LTC3895EFE#TRPBF	Step-Down	900 kHz	50 kHz	Transistor Driver	Surface Mount	125 ¯C	-40 °C	Buck	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Positive	1	1	100 %	38-TSSOP-EP	140 V	4 V

Catalog

150V Low IQ, Synchronous Step-Down DC/DC Controller

Key Features

• Wide VINRange: 4V to 140V (150V Abs Max)

• Wide Output Voltage Range: 0.8V to 60V

• Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE)

• Low Operating IQ: 40μA (Shutdown = 10μA)

• 100% Duty Cycle Operation

• No External Bootstrap Diode Required

• Selectable Gate Drive UVLO Thresholds

• Onboard LDO or External NMOS LDO for DRVCC

• EXTVCCLDO Powers Drivers from VOUT

• 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

• Adjustable or Fixed (5V/3.3V) Output Voltage

• Power Good Output Voltage Monitor

• Programmable Input Overvoltage Lockout

• 38-Lead TSSOP High Voltage Package

Description

The LTC3895 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage that can operate from input voltages up to 140V. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz.The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs to maximize efficiency. An integrated switch in the top gate driver eliminates the need for an external bootstrap diode. An internal charge pump allows for 100% duty cycle operation.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 LTC3895 features a precision 0.8V reference and power good output indicator. The output voltage can be programmed between 0.8V to 60V using external resistors or pin-programmed for a fixed 5V or 3.3V.ApplicationsAutomotive and Industrial Power SystemsHigh Voltage Battery Operated SystemsTelecommunications Power Systems