仕様
| 属性 | 値 |
| Package | Tape & Reel (TR),Cut Tape (CT),Bulk |
| ProductStatus | Active |
| OutputConfiguration | Positive |
| OutputType | Adjustable |
| NumberofRegulators | 1 |
| Voltage-Input(Max) | 15V |
| Voltage-Output(Min/Fixed) | 1.25V |
| Voltage-Output(Max) | 13.5V |
| VoltageDropout(Max) | 1.55V @ 1A |
| Current-Output | 1A |
| Current-Quiescent(Iq) | 10 mA |
| PSRR | 62dB (120Hz) |
| ProtectionFeatures | Over Current, Over Temperature |
| OperatingTemperature | -40°C ~ 125°C |
| MountingType | Surface Mount |
| Package/Case | TO-261-4, TO-261AA |
概要
Description
REG1117A/2K5 is a fixed low-dropout regulator in the REG1117/AMS1117 family. The “2K5” suffix denotes a fixed 2.5 V output version; other variants exist (e.g., 3.3 V, 5.0 V, adjustable).
Key points:
- Type: 1 A class LDO regulator; input up to about 15 V; output fixed at 2.5 V (for this variant) or adjustable in others.
- Dropout: ~1.1–1.3 V at full load; heat dissipation P = (Vin − Vout) × Iout (needs proper cooling).
- Pinout (SOT-223/TO-220, front view): Pin 1 = ADJ/GND, Pin 2 = Vout, Pin 3 = Vin; tab typically Vin.
- Stability: requires input and output capacitors (typical 10 µF on each, ESR within spec).
- Use: convenient 2.5 V rail for microcontrollers/sensors from a higher Vin supply.
Note: Always check the specific datasheet for exact pins, current limit, and capacitor requirements.
Key points:
- Type: 1 A class LDO regulator; input up to about 15 V; output fixed at 2.5 V (for this variant) or adjustable in others.
- Dropout: ~1.1–1.3 V at full load; heat dissipation P = (Vin − Vout) × Iout (needs proper cooling).
- Pinout (SOT-223/TO-220, front view): Pin 1 = ADJ/GND, Pin 2 = Vout, Pin 3 = Vin; tab typically Vin.
- Stability: requires input and output capacitors (typical 10 µF on each, ESR within spec).
- Use: convenient 2.5 V rail for microcontrollers/sensors from a higher Vin supply.
Note: Always check the specific datasheet for exact pins, current limit, and capacitor requirements.
Equivalent
REG1117A/2K5 is a 2.5V fixed 1A LDO in the 1117 family. Common equivalents (2.5V fixed) include:
- AMS1117-2.5
- LM1117-2.5
- LD1117V25
- AP1117-2.5
- AZ1117-2.5
- FAN1117-2.5
Check packaging and pinout for substitutions.
- AMS1117-2.5
- LM1117-2.5
- LD1117V25
- AP1117-2.5
- AZ1117-2.5
- FAN1117-2.5
Check packaging and pinout for substitutions.
Features
Key features of REG1117A/2K5 (fixed 2.5 V output):
- Fixed output: 2.5 V regulator in REG1117A family
- Output current: up to 1 A
- Low dropout: ~1.1–1.3 V at 1 A
- Input range: up to 15 V (max)
- Quiescent current: ~5 mA
- Protection: internal current limit and thermal shutdown
- Stability: requires external capacitors (minimum 10 μF on output with suitable ESR; input capacitor recommended)
- Temperature range: typically -40°C to +125°C
- Packaging: available in common formats (TO‑220, SOT‑223, D‑Pak, etc.)
Notes: Being fixed, no external resistor network is needed. Proper capacitors are essential for stability and transient performance.
- Fixed output: 2.5 V regulator in REG1117A family
- Output current: up to 1 A
- Low dropout: ~1.1–1.3 V at 1 A
- Input range: up to 15 V (max)
- Quiescent current: ~5 mA
- Protection: internal current limit and thermal shutdown
- Stability: requires external capacitors (minimum 10 μF on output with suitable ESR; input capacitor recommended)
- Temperature range: typically -40°C to +125°C
- Packaging: available in common formats (TO‑220, SOT‑223, D‑Pak, etc.)
Notes: Being fixed, no external resistor network is needed. Proper capacitors are essential for stability and transient performance.
Pinout
3 pins. It’s a fixed 2.5V low-dropout regulator (REG1117A/2K5). Pin1 Ground/ADJ, Pin2 Output, Pin3 Input.
Manufacturer
REG1117A/2K5 is not tied to a single unique brand; it’s a 2.5 V fixed LDO in the common 1117 family. The original 1117 family came from National Semiconductor, which is now part of Texas Instruments. TI is a multinational semiconductor company that designs and manufactures integrated circuits (including power-management and linear regulators). Many other vendors also produce 1117-compatible regulators.
Application
REG1117A/2K5 is a fixed 2.5 V low-dropout regulator. Common applications:
- Generate a clean 2.5 V rail for digital ICs (MCUs, DSPs, FPGA cores, memory)
- ADC/DAC references and op-amp biasing
- Post-regulation in compact power supplies for consumer electronics
- Battery-powered/portable devices sourcing from higher input voltages
- General embedded systems needing a small, stable 2.5 V supply
- Generate a clean 2.5 V rail for digital ICs (MCUs, DSPs, FPGA cores, memory)
- ADC/DAC references and op-amp biasing
- Post-regulation in compact power supplies for consumer electronics
- Battery-powered/portable devices sourcing from higher input voltages
- General embedded systems needing a small, stable 2.5 V supply
Package
SOT-223 3‑pin surface-mount package (fixed 2.5 V LDO).
