MCP1790 Datasheet, PDF (1/34 Pages) Microchip Technology – 70 mA, High Voltage Regulator

MCP1790/MCP1791
70 mA, High Voltage Regulator
Features
• 48V (43.5V ±10%) load dump protected for 180ms
with a 30 second repetition rate (FORD Test Pulse
G Loaded)
• Wide steady state supply voltage, 6.0V - 30.0V
• Extended Junction Temperature Range:
-40 to +125°C
• Fixed output voltages: 3.0V, 3.3V, 5.0V
• Low quiescent current: 70 µA typical
• Low shutdown quiescent current: 10 µA typical
• Output Voltage Tolerances of ±2.5% over the
temperature range
• Maximum output current of 70 mA @ +125°C
Junction Temperature
• Maximum continuous input voltage of 30V
• Internal thermal overload protection, +157°C
(typical) Junction Temperature
• Internal short circuit current limit, 120 mA (typical)
for +5V option.
• Short Circuit Current Foldback
• Shutdown Input option (MCP1791)
• Power Good Output option (MCP1791)
• High PSRR, -90 dB@100 Hz (typical)
• Stable with 1 µF to 1000 µF Tantalum and
Electrolytic Capacitors
• Stable with 4.7 µF to 1000 µF Ceramic Capacitors
Applications
• Low Voltage A/C powered (24VAC) Fire Alarms,
CO₂ Sensors, HVAC Controls
• Automotive Electronics
• Automotive Accessory Power Adapters
• Electronic Thermostat Controls
• Microcontroller power
General Description
The MCP1790/MCP1791 regulator provides up to 70 mA
of current. The input operating voltage range is specified
from 6.0V to 30V continuous, 48V absolute max, making
it ideal for automotive and commercial 12/24 VDC
systems.
The MCP1790/MCP1791 has a tight tolerance output
voltage load regulation of ±0.2% (typical) and a very
good line regulation at ±0.0002%/V (typical). The regu-
lator output is stable with ceramic, tantalum, and elec-
trolytic capacitors. The MCP1790/MCP1791 regulator
incorporates both thermal and short circuit protection.
The MCP1790 is the 3-pin version of the MCP1790/
MCP1791 family. The MCP1791 is the 5-pin version
and incorporates a Shutdown input signal and a Power
Good output signal.
The regulator is specifically designed to operate in the
automotive environment and will survive +48V (43.5V
±10%) load dump transients and double-battery jumps.
The device is designed to meet the stringent quiescent
current requirements of the automotive industry. The
device is also designed for the commercial low voltage
fire alarm/detector systems which use 24 VDC to sup-
ply the required alarms throughout buildings. The low
ground current, 110 µA (typ.), of the CMOS device will
provide a power cost savings to the end users over
similar bipolar devices. Typical buildings using hun-
dreds of 24V powered fire and smoke detectors can
see substantial savings on energy consumption and
wiring gage reduction compared to bipolar regulators.
The MCP1790 device will be offered in the 3-pin
DD-PAK, and SOT-223 packages.
The MCP1791 device will be offered in the 5-pin
DD-PAK, and SOT-223 packages.
The MCP1790/MCP1791 will have a junction tempera-
ture operating range of -40°C to +125°C.
© 2008 Microchip Technology Inc.
DS22075A-page 1