LT1616

` Wide Input Range: 3.6V to 25V
` 5V at 400mA from 7V to 25V Input
` 3.3V at 400mA from 4.7V to 25V Input
` Fixed Frequency 1.4MHz Operation
` Uses Tiny Capacitors and Inductors
` Internally Compensated
` Low Shutdown Current: <1A
` Low V_CESAT Switch: 220mV at 300mA
` Tiny 6-Lead SOT-23 Package

· Wall Transformer Regulation
· Local Logic Supply Conversion:
     12V to 5V
     12V or 5V to 3.3V, 2.5V or 1.8V
· Distributed Supply Regulation
· Digital Cameras
· Battery-Powered Equipment

Input Voltage (V_IN) ...................................................... 25V
BOOST Pin Voltage ....................................................... 35V
BOOST Pin Above SW Pin ............................................. 25V
SHDN Pin ...................................................................... 25V
FB Voltage ...................................................................... 6V
Current Into FB Pin ................................................... ±1mA
Operating Temperature Range (Note 2) .. 40°C to 85°C
Maximum Junction Temperature .............................. 125°C
Storage Temperature Range ...................65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................... 300°C

The LT^®1616 is a current mode PWM step-down DC/DC converter with internal 0.6A power switch, packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 25V makes the LT1616 suitable for regulating a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors. With its internal compensation eliminating additional components, a complete 400mA step-down regulator fits onto 0.15 square inches of PC board area.

The constant frequency current mode PWM architecture and stable operation with ceramic capacitors results in low, predictable output ripple. Current limiting providesprotection against shorted outputs. The low current of LT1616 (<1A)shutdown provides complete output disconnect, enabling easy power management in battery-powered systems.