LM7803SR
Overview
- 3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and size-compatible with LM7805 & LM7812 regulators
- Up to 95% efficiency - no heat sinks or thermal derating required!
- Two SIP-packages fit existing TO-220 footprints: Vertical-pin models occupy less than 0.1 square in. Optional horizontal pins provide 0.350 in. installed height
- +7.5-36Vdc operating input range; Low 3mA quiescent current
- Built-in filter capacitors - no external components required
- -40 to +70°C operation at full load; Short-circuit protection
- Excellent load (±0.2%) and line (±0.3%) regulation
- Ideal for powering instrumentation from 9V/12V/24V/28V supplies or batteries
- Can be used with unregulated dc supplies
- 3V/5V/12V Outputs High-Efficiency Switching Regulators with LM78XX Pinouts DATEL’s 7805SR (5V output), 7812SR (12V output) and 7803SR (3.3V output) step-down switching regulators are modern drop-in replacements for older, inefficient, LM7805 and LM7812 linear regulators. The 78XXSR's are pin- and sizecompatible with industry-standard TO-220 SIP packages. A 260kHz switching frequency provides for efficiencies as high as 95%. Full-load (up to 0.5A) operation from 9V, 12V, 24V, or 36V supplies at ambient temperatures up to +70°C requires no heat sinks, no temperature derating, no forced-air cooling, and no external capacitors. 78SR switching regulators provide many significant improvements over their linear counterparts: lower quiescent current (3mA vs. 5 mA), higher input voltage (40V vs. 32V), and better output accuracy (±1.5% vs. ±5%). All these features combine to make 78SR regulators ideal for new or existing LM7805 & LM7812 applications requiring full-load operation at elevated voltages. Technical Notes
