Description:

The LP2951 is a low-dropout regulator (LDO) with a wide input range, supporting input voltages from 2V to 30V and capable of delivering load currents up to 100mA. The LP2951 can provide either a fixed or adjustable output from the same device. By connecting the OUTPUT and SENSE pins together, and connecting the FEEDBACK and VTAP pins together, the LP2951 output can provide a fixed output of 3.3V or 5V. Alternatively, keep the SENSE and VTAP pins open while connecting FEEDBACK to an external resistor divider. This configuration allows the output to be set to any value between VREF and 29V (for VREF details, refer to the Electrical Characteristics (Legacy Chip and New Chip)). The LP2951 features an ERROR output that monitors the feedback pin voltage to indicate the output voltage status. The SHUTDOWN input and ERROR output are used for sequencing multiple power supplies in a system.

Features:

• Wide input voltage range

– VIN range: 2V to 30V

• Wide output voltage range VOUT

– Fixed voltage: 3V (legacy chip), 3.3V, 5.0V

– Adjustable voltage: VREF to 29V

• Output current: 100mA

• VOUT accuracy:

– ±2% over line, load, and temperature (legacy chip)

– ±1% over line, load, and temperature (new chip)

• Quiescent current IQ (new chip): 50μA (typical)

• Low dropout (new chip): 340mV (typical)

• Output current limiting and thermal shutdown

• Stable over a wide range of ceramic output capacitor values

– COUT range: 1μF to 100μF (new chip)

– ESR range: 0 to 2Ω (new chip)

• Operating junction temperature: -40°C to 125°C

• Package options:

– LP (3-pin TO-92)

– D (8-pin SOIC)

– DRG (8-pin WSON)

Applications:

• Grid infrastructure

• Factory automation

• Motor drives

• Building automation