LT1303-5

GND (Pin 1): Signal Ground. Tie to PGND under the package.
LBO (Pin 2): Open-Collector Output of Low-Battery Comparator.Can sink 100mA. Disabled when device is in shutdown.
SHDN (Pin 3): Shutdown. Pull high to shut down the device. Ground for normal operation.FB/Sense (Pin 4): On 1303 (adjustable) this pin connects to the main comparator C1 input. On LT1303-5 this pin connects to the resistor string that sets output voltage at 5V.
LBI (Pin 5): Low-Battery Comparator Input. When voltage on this pin below 1.24V, LBO is low.VIN (Pin 6): Supply Pin. Must be bypassed with a large value electrolytic to ground. Keep bypass within 0.2" of the device.
SW (Pin 7): Switch Pin. Connect inductor and diode here.Keep layout short and direct to minimize radio frequency
interference.
PGND (Pin 8): Power ground. Tie to signal ground (pin1) under the package. Bypass capacitor from VIN should be tied directly to PGND within 0.2" of the device.

The LT®1303/LT1303-5 are micropower step-up high efficiency DC/DC converters using Burst ModeTM operation.They are ideal for use in small, low-voltage batteryoperated systems. The LT1303-5 accepts an input voltage between 1.8V and 5V and converts it to a regulated 5V. The LT1303 is an adjustable version that can supply an output voltage up to 25V. Quiescent current is only 120mA from the battery and the shutdown pin further reduces current to 10mA. The low-battery detector provides an opencollector output that goes low when the input voltage drops below a preset level. The on-chip NPN power switch has a low 170mV saturation voltage at a switch current of 1A. The LT1303/LT1303-5 are available in 8-lead PDIP or SO packages, easing board space requirements.

For higher output current, please see the LT1305 or LT1302.