Description

The SC16C650BIN40 is a high performance inverting DC-DC converter designed to drive an external power switch and generate programmable negative voltages. It is particularly suitable for LCD bias contrast applications, achieving maximum efficiency of 90% with low-cost PNP bipolar transistor drivers. The input operation range of the SC16C650BIN40 is 4V to 24V, making it suitable for battery-operated applications. By using two external resistors, the output voltage can be scaled to -40V. The SC16C650BIN40 utilizes pulse frequency modulation to maintain high efficiency conversion under wide input voltage ranges. In shutdown mode, the quiescent current is about 100µA, which can be reduced to 8µA. With a switching frequency range of 100kHz to 320kHz, the SC16C650BIN40 is ideal for battery-powered portable equipment such as notebook and palmtop computers.

Specifications and 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%)

- 100kHz to 320kHz switching frequency

- Power-Saving shutdown mode (8µA typical)

- High efficiency with low-cost external PNP bipolar transistor

Application Scenarios

- Negative LCD contrast bias for:

1. Notebook & palmtop computers
2. Pen-based data systems
3. Portable data collection terminals
4. Personal digital assistants

- Negative voltage supplies

Comparison

- High performance inverting DC-DC converter

- Programmable negative voltages

- Maximum efficiency of 90%

- Can be powered directly by battery packs

- Wide input voltage range

- Adjustable output voltage

- Power-saving shutdown mode

- Compact size

- Suitable for portable equipment

- Requires external power switch

- External resistors needed for scaled output voltage