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Microchip Technology MCP1790 & MCP1791 Low Dropout Regulators

Microchip MCP1790 and MCP1791 Low Dropout Regulators (LDOs) provide up to 70 mA of current with an input operating voltage range from 6.0V to 30V continuous, 48V absolute max, making these devices ideal for automotive and commercial 12/24 VDC systems. The MCP1790 and MCP1791 LDOs have 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. These devices incorporate both thermal and short circuit protection. 

The MCP1790 is offered in a 3-pin DD-PAK and SOT-223 package. The MCP1791 is offered in a 5-pin DD-PAK and SOT-223 packages. The MCP1791 LDO also incorporates a shutdown input signal and a power good output signal. Applications include automotive electronics, electronic thermostat controls, low voltage A/C powered (24VAC) fire alarms, CO2 sensors, HVAC controls, and microcontroller power.

Features

  • 48.0V (43.5V ±10%) load dump protected for 180ms with a 30-second repetition rate (FORD Test Pulse G Loaded)
  • Wide steady state supply voltage 6V to 30V
  • Extended junction temperature range -40°C to +125°C
  • Fixed output voltages of 3.0V, 3.3V, and 5.0V
  • Low quiescent current 70µA typical
  • Low shutdown quiescent current 10µA typical
  • Output voltage tolerances of ±2.5% over the temperature range
  • Maximum output current of 70mA @ +125°C junction temperature
  • Maximum continuous input voltage of 30.0V
  • Internal short circuit current limit 120mA (typical) for +5.0V option
  • Short circuit current foldback
  • Shutdown Input option (MCP1791)
  • Power Good Output option (MCP1791)
  • High PSRR, -90dB @100Hz (typical)
  • Stable with 1µF to 1000µF tantalum and electrolytic capacitors
  • Stable with 4.7µF to 1000µF ceramic capacitors
  • Package options
    • MCP1790: 3-pin DD-PAK and SOT-223
    • MCP1791: 5-pin DD-PAK and SOT-223

Applications

  • Low voltage A/C powered (24VAC) fire alarms, CO2 sensors, and HVAC controls
  • Automotive electronics
  • Automotive accessory power adapters
  • Electronic thermostat controls
  • Microcontroller power

Typical Application Circuit (MCP1790)

Application Circuit Diagram - Microchip Technology MCP1790 & MCP1791 Low Dropout Regulators

Typical Application Circuit (MCP1791)

Microchip Technology MCP1790 & MCP1791 Low Dropout Regulators
Inilathala: 2008-05-02 | Na-update: 2025-09-11