SC1650
SC1650 is HIGH-VOLTAGE INVERTING DC-DC CONVERTER manufactured by SEMTECH.
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 employed to maintain high efficiency conversion under wide input voltage ranges. Quiescent current is about 100µA and can be reduced to 8µA in shutdown mode. With a switching frequency range of 100k Hz to 320k Hz, small size switching ponents may be used, which is ideal for battery powered portable equipment such as notebook and palmtop puters.
Features
- 4V to 24V input voltage operation
- Adjustable output voltage up to -40V
- Low quiescent current at 100µA
- Pulse frequency modulation maintains high
- -
- efficiency (max 90%) 100k Hz to 320k Hz switching frequency Power-Saving shutdown mode (8µA typical) High efficiency with low cost external PNP bipolar transistor
APPLICATIONS
- Negative LCD contrast bias for
1. Notebook & palmtop puters 2. Pen-based data systems 3. Portable data collection terminals 4. Personal digital assistants Negative voltage supplies
- BLOCK DIAGRAM ORDERING INFORMATION
DEVICE
(1)
VOUT Adj
PACKAGE SO-8
SC1650CS
Note: (1) Add suffix ‘TR’ for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter Supply Voltage Symbol V+ VSHDN TA Maximum 24 15 0 to 70 Units V V °C
PIN CONFIGURATION
SHDN Voltage Operating Temperature Range Storage Temperature Range
TSTG
-65 to 125
°C
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH-VOLTAGE INVERTING DC-DC CONVERTER
January 29,...
