LT1933 Datasheet

• Wide Input Range: 3.6V to 36V
• 5V at 600mA from 16V to 36V Input
• 3.3V at 600mA from 12V to 36V Input
• 5V at 500mA from 6.3V to 36V Input
• 3.3V at 500mA from 4.5V to 36V Input
• Fixed Frequency 500kHz Operation
• Uses Tiny Capacitors and Inductors
• Soft-Start
• Internally Compensated
• Low Shutdown Current: <2µA
• Output Adjustable Down to 1.25V
• Low Profile (1mm) SOT-23 (ThinSOT^™) and (2mm × 3mm × 0.75mm) 6-Pin DFN Packages

• Automotive Battery Regulation
• Industrial Control Supplies
• Wall Transformer Regulation
• Distributed Supply Regulation
• Battery-Powered Equipment

The LT1933 is a current mode PWM step-down DC/DC converter with an internal 0.75A power switch, packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 36V makes the LT1933 suitable for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

Cycle-by-cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start up. The low current (<2µA) shutdown provides output disconnect, enabling easy power management in battery-powered systems.