The LP2951ACMX/NOPB from Texas Instruments is a micropower 100 mA adjustable low-dropout regulator with shutdown and an error-flag output. Its output is programmable from 1.24 V to 29 V via an external divider, drawing typically 75 µA quiescent current from a 2.3 V to 30 V input. Dropout is typically 380 mV at full load, with tight ±0.5 % typical output accuracy. Supplied in an 8-pin SOIC package and specified across -40 °C to +125 °C, it suits battery-powered systems.
Key Specifications
| Manufacturer | Texas Instruments |
| Exact Manufacturer Part Number | LP2951ACMX/NOPB |
| Product Category | Power Management – Voltage Regulators |
| Series / Family | LP2951 |
| Package / Case | SOIC-8 (D) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C to +125°C |
| Power Supply | 2.3 V to 30 V (input) |
| Output Current | 100 mA |
| Output Voltage | Adjustable 1.24 V to 29 V |
| Dropout Voltage | 380 mV (typ. @ 100 mA) |
| Input Voltage | 2.3 V to 30 V |
| Quiescent Current | 75 µA (typical) |
| Output Tolerance | ±0.5% (typical) |
| Features | Shutdown + Error flag |
| Lifecycle Status | Active |
| Official Documentation | View official documentation |
Key Features
- Adjustable output from 1.24 V to 29 V via external divider
- Micropower 75 µA typical quiescent current
- Error-flag (power-good) output signals low output voltage
- Active-high shutdown input for power sequencing
- Tight ±0.5 % typical output accuracy (A grade)
- Low 380 mV dropout at 100 mA
- Stable with low-ESR output capacitors
Applications
- Battery-powered systems
- Memory and RTC backup supplies
- Post regulators for switched supplies
- Portable consumer electronics
- Microcontroller analogue rails
Sourcing
Availability, lead time, date code and commercial terms are subject to confirmation at the time of quotation.
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FAQ
How does the LP2951 differ from the LP2950?
The LP2951 adds an active-high shutdown input and an error-flag output for power sequencing and monitoring, while the LP2950 is a simpler fixed or adjustable regulator without these controls.
What does the ‘A’ grade in LP2951ACMX mean?
The A grade specifies a tighter typical output-voltage tolerance of ±0.5 %, compared with the wider tolerance of the standard LP2951 grade.
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