HIGH-VOLTAGE INVERTING DC-DC CONVERTER
January 29, 1998
SC1650
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.
semtech.
com
DESCRIPTION
The SC1650 is a high performance inverting DC-DC converter, designed to drive an external power switch to generate programmable negative voltages.
In the particularly suitable LCD bias contrast application, maximum efficiency of 90% can be achieved with low cost
PNP bipolar
transistor drivers.
The 4V to 24V input operation range allows the SC1650 to be powered directly by the battery pack in most batteryoperated applications for greater efficiency.
The output voltage can be scaled to -40V by two external resistors.
A pulse frequency modulation scheme is e...