Features

• Wide Operating Input Voltage Range: 4V to 150V
• Synchronous Operation for Highest Efficiency
• Internal High Side and Low Side Power MOSFETs
• No Compensation Required
• Adjustable 10mA to 100mA Maximum Output Current
• Low Dropout Operation: 100% Duty Cycle
• Low Quiescent Current: 12μA
• Wide Output Range: 0.8V to V_IN
• 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

Typical Application

Description

The LTC®3639 is a high efficiency step-down DC/DC regulator with internal high side and synchronous power switches that draws only 12μA typical DC supply current while maintaining a regulated output voltage at no load.

The LTC3639 can supply up to 100mA 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 LTC3639’s combination of Burst Mode® operation, integrated power switches, 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 150V and programmable overvoltage lockout, the LTC3639 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC3639 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment.

The LTC3639 is available in a thermally enhanced high voltage-capable 16-lead MSE package with four missing pins.