Features

• Wide Input Range: 3.6V to 36V
• Short-Circuit Protected Over Full Input Range
• 1.9A Guaranteed Minimum Switch Current
• 5V at 1.4A from 10V to 36V Input
• 3.3V at 1.4A from 7V to 36V Input
• 5V at 1.2A from 6.3V to 36V Input
• 3.3V at 1.2A from 4.5V to 36V Input
• Output Adjustable Down to 1.20V
• 500kHz Fixed Frequency Operation
• Soft-Start
• Uses Small Ceramic Capacitors
• Internal or External Compensation
• Low Shutdown Current: <2µA
• Thermally Enhanced 8-Lead MSOP Package

Typical Application

Description

The LT1936 is a current mode PWM step-down DC/DC converter with an internal 1.9A power switch, packaged in a tiny, thermally enhanced 8-lead MSOP. The wide input range of 3.6V to 36V makes the LT1936 suitable for regulating power from a wide variety of sources, including automotive batteries, 24V industrial supplies and unregulated wall adapters. Its high operating frequency allows the use of small, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

Cycle-by-cycle current limit, frequency foldback and thermal shutdown provide protection against shorted outputs, and soft-start eliminates input current surge during startup. Transient response can be optimized by using external compensation components, or board space can be minimized by using internal compensation. The low current (<2µA) shutdown mode enables easy power management in battery-powered systems.