LTC7138 Series

High Efficiency, 140V 400mA Step-Down Regulator with PassThru

Catalog

High Efficiency, 140V 400mA Step-Down Regulator with PassThru

Part	Operating Temperature [Min]	Operating Temperature [Max]	Number of Outputs	Topology	Voltage - Input (Min) [Min]	Function	Synchronous Rectifier	Mounting Type	Output Type	Voltage - Output (Min/Fixed)	Voltage - Output (Min/Fixed)	Voltage - Output (Min/Fixed)	Voltage - Output (Min/Fixed)	Voltage - Output (Max) [Max]	Package / Case	Package / Case	Voltage - Input (Max) [Max]	Current - Output	Supplier Device Package	Output Configuration
Analog Devices LTC7138EMSE#PBF	-40 °C	125 ¯C	1	Buck	4 V	Step-Down		Surface Mount	Adjustable (Programmable)	0.8 V	3.3 V	1.8 V	5 V	140 V	0.118 in 3 mm 12	16-TFSOP Exposed Pad	140 V	400 mA	16-MSOP-EP	Positive
Analog Devices LTC7138HMSE#PBF	-40 °C	150 °C	1	Buck	4 V	Step-Down		Surface Mount	Adjustable (Programmable)	0.8 V	3.3 V	1.8 V	5 V	140 V	0.118 in 3 mm 12	16-TFSOP Exposed Pad	140 V	400 mA	16-MSOP-EP	Positive

Catalog

High Efficiency, 140V 400mA Step-Down Regulator with PassThru

Key Features

• Wide Operating Input Voltage Range: 4V to 140V

• Internal Low Resistance Power MOSFET

• No Compensation Required

• Adjustable 100mA to 400mA Maximum Output Current

• Low Dropout Operation: 100% Duty Cycle

• Low Quiescent Current: 12μA

• Wide Output Range: 0.8V to VIN

• 0.8V ±1% Feedback Voltage Reference

• Precise RUN Pin Threshold

• Internal or External Soft-Start

• Programmable 1.8V, 3.3V, 5V or Adjustable Output

• Few External Components Required

• Programmable Input Overvoltage Lockout

• Thermally Enhanced High Voltage MSOP Package

Description

The LTC7138 is a high efficiency step-down DC/DC regulator with internal power switch that draws only 12μA typical DC supply current while maintaining a regulated output voltage at no load.The LTC7138 can supply up to 400mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size. The LTC7138’s combination of Burst Mode®operation, integrated power switch, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents.With its wide input range of 4V to 140V and programmable overvoltage lockout, the LTC7138 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC7138 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment. A feedback comparator output enables multiple LTC7138s to be connected in parallel for higher current applications.The LTC7138 is available in a thermally enhanced high voltage-capable 16-lead MSE package with four missing pins.ApplicationsIndustrial Control SuppliesMedical DevicesDistributed Power SystemsPortable InstrumentsBattery-Operated DevicesAvionicsAutomotive