MCP1781 Evaluation Board

The MCP1781 is a high-voltage, low dropout (LDO) regulator, capable of generating 200 mA output current. The input voltage range of 4.3V to 55V makes it suitable in 12V to 48V power rails and in high-voltage battery packs or in automotive applications where operating through large transients, such as load dump, is often expected.

A low UVLO at shutdown of 2.3V makes it adequate for cold cranking conditions in automotive applications.

The MCP1781 comes in two standard fixed output voltage versions: 3.3V and 5.0V. The regulator output is stable with 3.3 μF ceramic capacitors. The device is protected from short-circuit events by the current foldback function and from overheating by means of thermal shutdown protection.

The MCP1781 comes in two 5-lead packages, SOT-223 and TO-252, both with PGOOD pin and nSHDN pin. While in shutdown, the quiescent current drops to 3.5 μA, allowing for lower, overall power consumption. The device itself has a typical quiescent current of 35 μA, and a typical ground current of 73 μA while delivering maximum output current of 200 mA.

• Wide Input Voltage Range: 4.3V to 55V
• Under Voltage Lock Out (UVLO) at start-up: 2.75V typical
• Extended Operating Temperature Range: -40°C to +150°C
• Standard Output Regulated Voltages (VR): 3.3V and 5.0V (Note)
• Tolerance ± 2.0% Over Temperature
• Open Drain Power Good Pin for LDO Output
• Low Quiescent Supply Current: 35 μA typical
• Low Shutdown Quiescent Supply Current: 3.5 μA Typical
• Output Current Capability Typical: 200 mA
• Short Circuit Current Foldback Protection
• Thermal Shutdown Protection: 164°C
• Stable with Ceramic Output Capacitor: 3.3 μF
• High PSRR:
  • 82 dB @ 100 Hz Typical
  • 36 dB @ 100 kHz Typical
• Available in the Following Packages:
  • 5-Lead TO-252
  • 5-Lead SOT-223