MCP1790/MCP1791
70 mA, High Voltage Regulator
Features General Description
48V (43.5V 10%) load dump protected for 180ms 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 regu-
Low quiescent current: 70 A typical
lator output is stable with ceramic, tantalum, and elec-
Low shutdown quiescent current: 10 A typical
trolytic capacitors. The MCP1790/MCP1791 regulator
Output Voltage Tolerances of 2.5% over the
incorporates both thermal and short circuit protection.
temperature range
The MCP1790 is the 3-pin version of the MCP1790/
Maximum output current of 70 mA @ +125C
MCP1791 family. The MCP1791 is the 5-pin version
Junction Temperature
and incorporates a Shutdown input signal and a Power
Maximum continuous input voltage of 30V
Good output signal.
Internal thermal overload protection, +157C
The regulator is specifically designed to operate in the
(typical) Junction Temperature
automotive environment and will survive +48V (43.5V
Internal short circuit current limit, 120 mA (typical)
10%) load dump transients and double-battery jumps.
for +5V option.
The device is designed to meet the stringent quiescent
Short Circuit Current Foldback
current requirements of the automotive industry. The
device is also designed for the commercial low voltage
Shutdown Input option (MCP1791)
fire alarm/detector systems which use 24 VDC to sup-
Power Good Output option (MCP1791)
ply the required alarms throughout buildings. The low
High PSRR, -90 dB@100 Hz (typical)
ground current, 110 A (typ.), of the CMOS device will
Stable with 1 F to 1000 F Tantalum and
provide a power cost savings to the end users over
Electrolytic Capacitors
similar bipolar devices. Typical buildings using hun-
Stable with 4.7 F to 1000 F Ceramic Capacitors
dreds of 24V powered fire and smoke detectors can
see substantial savings on energy consumption and
Applications wiring gage reduction compared to bipolar regulators.
The MCP1790 device will be offered in the 3-pin
Low Voltage A/C powered (24VAC) Fire Alarms,
DD-PAK, and SOT-223 packages.
CO Sensors, HVAC Controls
2
The MCP1791 device will be offered in the 5-pin
Automotive Electronics
DD-PAK, and SOT-223 packages.
Automotive Accessory Power Adapters
Electronic Thermostat Controls The MCP1790/MCP1791 will have a junction tempera-
ture operating range of -40C to +125C.
Microcontroller power
2008 Microchip Technology Inc. DS22075A-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)
DS22075A-page 2 2008 Microchip Technology Inc.