LOW
VOLTAGE STEP-UP DC-DC CONVERTER
January 29, 1998
SC1633
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.
semtech.
com
DESCRIPTION
The SC1633 is a high efficiency step up DC-DC converter.
Only four external components are required to deliver a fixed
voltage of 3V, 3.
3V, or 5V.
Efficiency beyond 83% can be easily achieved at 70mA load with 2.
2V to 3V input
voltages.
A logic-controlled shutdown mode is provided for power saving.
Switch current limit can be programmed with a resistor.
The low battery detector can be configured as a linear regulator or a burst mode controller providing extremely low supply current operation.
A switching rate of 120kHz reduces the inductor size inductors of ...