LTC7801 Series

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

Catalog

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

Part	Mounting Type	Output Configuration	Control Features	Package / Case	Package / Case	Package / Case [y]	Topology	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Clock Sync	Function	Output Type	Frequency - Switching [Max]	Frequency - Switching [Min]	Number of Outputs	Output Phases	Operating Temperature [Min]	Operating Temperature [Max]	Synchronous Rectifier	Duty Cycle (Max) [Max]	Supplier Device Package
Analog Devices LTC7801IFE#TRPBF	Surface Mount	Positive	Current Limit Power Good Soft Start Tracking	0.173 in	24-TSSOP Exposed Pad	4.4 mm	Buck	140 V	4 V		Step-Down	Transistor Driver	900 kHz	50 kHz	1	1	-40 °C	125 ¯C		100 %	24-TSSOP
Analog Devices LTC7801EUFD#PBF	Surface Mount	Positive	Current Limit Power Good Soft Start Tracking		24-WFQFN Exposed Pad		Buck	140 V	4 V		Step-Down	Transistor Driver	900 kHz	50 kHz	1	1	-40 °C	125 ¯C		100 %	24-QFN (4x5)

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

• Integrated Bootstrap Diode

• 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

• Power Good Output Voltage Monitor

• Programmable Input Overvoltage Lockout

• Small 24-Lead 4mm × 5mm QFN or TSSOP Packages

Description

The LTC7801 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 LTC7801 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.APPLICATIONSAutomotive and Industrial Power SystemsHigh Voltage Battery Operated SystemsTelecommunications Power Systems