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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1790 Datasheet

High Voltage Regulator

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MCP1790/MCP1791
70 mA, High Voltage Regulator
Features
• 48V (43.5V ±10%) load dump protected for <500 ms
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
regulator output is stable with ceramic, tantalum and
electrolytic 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
supply 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
hundreds 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
temperature operating range of -40°C to +125°C.
© 2010 Microchip Technology Inc.
DS22075B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1790 Datasheet

High Voltage Regulator

No Preview Available !

MCP1790/MCP1791
Package Types
DDPAK-3
MCP1790
SOT-223-3
4
123
1 23
Pin
1 VIN
2 GND (TAB)
3 VOUT
4 GND (TAB)
DDPAK-5
MCP1791
SOT-223-5
6
12345
12 345
Pin
1 SHDN
2 VIN
3 GND (TAB)
4 VOUT
5 PWRGD
6 GND (TAB)
DS22075B-page 2
© 2010 Microchip Technology Inc.


Part Number MCP1790
Description High Voltage Regulator
Maker Microchip
Total Page 30 Pages
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