MCP1790/MCP1791 70 mA, High Voltage Regulator Features General Description 48V (43.5V 10%) load dump protected for <500 ms The MCP1790/MCP1791 regulator provides up to 70 mA with a 30 second repetition rate (FORD Test Pulse of current. The input operating voltage range is specified G Loaded) from 6.0V to 30V continuous, 48V absolute max, making it ideal for automotive and commercial 12/24VDC Wide steady state supply voltage, 6.0V - 30.0V systems. Extended Junction Temperature Range: The MCP1790/MCP1791 has a tight tolerance output -40 to +125C voltage load regulation of 0.2% (typical) and a very Fixed output voltages: 3.0V, 3.3V, 5.0V good line regulation at 0.0002%/V (typical). The Low quiescent current: 70 A typical regulator output is stable with ceramic, tantalum and Low shutdown quiescent current: 10 A typical electrolytic capacitors. The MCP1790/MCP1791 Output Voltage Tolerances of 2.5% over the regulator incorporates both thermal and short circuit temperature range protection. Maximum output current of 70 mA +125C The MCP1790 is the 3-pin version of the MCP1790/ Junction Temperature MCP1791 family. The MCP1791 is the 5-pin version Maximum continuous input voltage of 30V and incorporates a Shutdown input signal and a Power Internal thermal overload protection, +157C Good output signal. (typical) Junction Temperature The regulator is specifically designed to operate in the Internal short circuit current limit, 120 mA (typical) automotive environment and will survive +48V (43.5V for +5V option 10%) load dump transients and double-battery jumps. Short Circuit Current Foldback The device is designed to meet the stringent quiescent current requirements of the automotive industry. The Shutdown Input option (MCP1791) device is also designed for the commercial low voltage Power Good Output option (MCP1791) fire alarm/detector systems, which use 24 VDC to High PSRR, -90 dB 100 Hz (typical) supply the required alarms throughout buildings. The Stable with 1 F to 1000 F Tantalum and low ground current, 110 A (typ.), of the CMOS device Electrolytic Capacitors will provide a power cost savings to the end users over Stable with 4.7 F to 1000 F Ceramic Capacitors similar bipolar devices. Typical buildings using hundreds of 24V powered fire and smoke detectors can Applications see substantial savings on energy consumption and wiring gage reduction compared to bipolar regulators. Low Voltage A/C powered (24VAC) Fire Alarms, The MCP1790 device will be offered in the 3-pin CO Sensors, HVAC Controls 2 DD-PAK, and SOT-223 packages. Automotive Electronics The MCP1791 device will be offered in the 5-pin Automotive Accessory Power Adapters DD-PAK, and SOT-223 packages. Electronic Thermostat Controls The MCP1790/MCP1791 will have a junction Microcontroller power temperature operating range of -40C to +125C. 2010 Microchip Technology Inc. DS22075B-page 1MCP1790/MCP1791 Package Types MCP1790 MCP1791 DDPAK-3 SOT-223-3 DDPAK-5 SOT-223-5 4 6 12 3 1 2 3 12 4 3 5 12 3 4 5 Pin Pin 1V IN 1SHDN 2GND (TAB) 2V IN 3V OUT 3 GND (TAB) 4GND (TAB) 4V OUT 5 PWRGD 6 GND (TAB) DS22075B-page 2 2010 Microchip Technology Inc.