Thông số kỹ thuật
| thuộc tính | Giá trị |
| Package / Case | Tube,Tube |
| Part Status | Not For New Designs |
| Output Configuration | Positive |
| Output Type | Adjustable (Fixed) |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 30V |
| Voltage - Output (Min/Fixed) | 1.235V (3.3V) |
| Voltage - Output (Max) | 29V |
| Voltage Dropout (Max) | 0.6V @ 100mA |
| Current - Output | 100mA |
| Current - Quiescent (Iq) | 120 µA |
| Current - Supply (Max) | 14 mA |
| Control Features | Enable |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
Tổng quan
Description
The LP2951CM-3.3 is a fixed-output low-dropout regulator from the LP2951 family that provides a stable 3.3-volt supply. It is designed for low-power, battery-powered and embedded electronics, delivering a clean 3.3V rail from a higher input voltage with modest quiescent current. Key protections typically included are short-circuit protection and thermal shutdown; it also offers good line and load regulation and requires an external output capacitor for stability.
Package/Pinout: The CM suffix denotes a specific package variant; in standard 3-pin regulators the pins are typically Input, Ground, and Output (check the datasheet for the exact orientation for the CM package).
Common use: powering microcontrollers and 3.3V logic in portable or compact systems.
How to use: connect Vin to your supply (above 3.3V), ground to system ground, and Vout to the 3.3V rail. Add the recommended input/output capacitors per the datasheet to ensure stability and performance.
For exact electrical specs (max input voltage, current limit, dropout, cap values), consult the LP2951CM-3.3 datasheet.
Package/Pinout: The CM suffix denotes a specific package variant; in standard 3-pin regulators the pins are typically Input, Ground, and Output (check the datasheet for the exact orientation for the CM package).
Common use: powering microcontrollers and 3.3V logic in portable or compact systems.
How to use: connect Vin to your supply (above 3.3V), ground to system ground, and Vout to the 3.3V rail. Add the recommended input/output capacitors per the datasheet to ensure stability and performance.
For exact electrical specs (max input voltage, current limit, dropout, cap values), consult the LP2951CM-3.3 datasheet.
Equivalent
LP2951CM-3.3 is a fixed 3.3V low-dropout regulator. Common equivalents (3.3V fixed LDOs) include:
- LM1117-3.3
- LD1117-3.3
- AMS1117-3.3
- NCP1117-3.3
- MCP1700-33
- LT1763-3.3
Note that pinouts, dropout, and current ratings vary; verify against the datasheet before swapping.
- LM1117-3.3
- LD1117-3.3
- AMS1117-3.3
- NCP1117-3.3
- MCP1700-33
- LT1763-3.3
Note that pinouts, dropout, and current ratings vary; verify against the datasheet before swapping.
Features
Here are the typical features of LP2951CM-3.3 (fixed 3.3V LDO):
- Fixed output: 3.3 V
- Low dropout regulator (LDO)
- Input voltage range up to ~30 V
- Output current up to about 100 mA
- Low quiescent current (very energy-efficient)
- Excellent line and load regulation
- Protection: current-limiting and thermal shutdown
- Requires output capacitor for stability (low ESR, e.g., 4.7 µF or larger)
- Wide operating temperature range (roughly -40°C to +125°C)
- Package: CM variant (compact surface-mount/DIP format per datasheet)
Note: exact specs vary by device revision; consult the datasheet for your specific lot.
- Fixed output: 3.3 V
- Low dropout regulator (LDO)
- Input voltage range up to ~30 V
- Output current up to about 100 mA
- Low quiescent current (very energy-efficient)
- Excellent line and load regulation
- Protection: current-limiting and thermal shutdown
- Requires output capacitor for stability (low ESR, e.g., 4.7 µF or larger)
- Wide operating temperature range (roughly -40°C to +125°C)
- Package: CM variant (compact surface-mount/DIP format per datasheet)
Note: exact specs vary by device revision; consult the datasheet for your specific lot.
Pinout
Pin count: 3 pins. Function: fixed 3.3 V low-dropout regulator (LDO). The three pins are Vin, Ground, and Vout (TO-92/CM package).
Manufacturer
- Manufacturer: Texas Instruments (TI). TI is an American multinational semiconductor company that designs and manufactures analog and embedded processing ICs. The LP2951 family originated with National Semiconductor and came under TI after its 2011 acquisition.
Application
LP2951CM-3.3 is a fixed 3.3V low-dropout regulator (typical up to ~100 mA). Common applications:
- 3.3V supply for microcontrollers and digital logic in embedded/battery-powered devices
- Post-regulation for compact power supplies supplying a 3.3V rail
- Analog/digital mixed-signal circuits (op-amps, ADCs/DACs) needing a stable 3.3V
- Consumer electronics and portable devices requiring a low-noise, fixed 3.3V rail
- Development boards and educational/prototyping kits with 3.3V logic requirements
- 3.3V supply for microcontrollers and digital logic in embedded/battery-powered devices
- Post-regulation for compact power supplies supplying a 3.3V rail
- Analog/digital mixed-signal circuits (op-amps, ADCs/DACs) needing a stable 3.3V
- Consumer electronics and portable devices requiring a low-noise, fixed 3.3V rail
- Development boards and educational/prototyping kits with 3.3V logic requirements
Package
TO-92 plastic molded, 3-pin package (TO-92-3).
