Analog Devices LT3503 Product Info

• Wide Input Range: 3.6V to 20V
• 5V at 1.2A from 11V to 18V Input
• 5V at 1A from 7.2V to 18V Input
• 3.3V at 1.2A from 8.5V to 12V Input
• 3.3V at 1A from 5.5V to 12V Input
• Fixed Frequency Operation: 2.2MHz
• Output Adjustable Down to 780mV
• Short-Circuit Robust
• Uses Tiny Capacitors and Inductors
• Soft-Start
• Internally Compensated
• Low Shutdown Current: <2µA
• Low V_CESAT Switch: 400mV at 1A
• Thermally Enhanced, 2mm × 3mm 6-Pin DFN Low Profile Package

The LT3503 is a current mode PWM step-down DC/DC converter with an internal 1.45A power switch. The wide operating input range of 3.6V to 20V makes the LT3503 ideal for regulating power from a wide variety of sources. 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 mode provides output disconnect, enabling easy power management in battery-powered systems.

Applications

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