LM1117

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LM1117

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Übersicht

Description

LM1117 is a popular low-dropout linear regulator (LDO) from National/TI. It provides a regulated output from a higher input, with fixed versions (e.g., 3.3V, 5.0V) and an adjustable version (LM1117-ADJ).
Key points:
- Input up to ~15V; output current up to ~1 A with proper heatsinking.
- Dropout around 1.1–1.3 V at moderate load (higher if loaded hard).
- Efficiency is low (linear regulator), dissipating (Vin − Vout) × I as heat; thermal management matters.
- Requires input and output capacitors for stability (typ. 10 µF on each; low-ESR types recommended).
- Pinout (TO-220/SOT-223) commonly Adj/GND, Vout, Vin; check the datasheet for exact package.
- Common uses: simple 5V/3.3V rails for microcontrollers, hobby projects, or as an adjustable regulator in small power supplies.
Note: Always verify exact pinout and capacitor ESR requirements from the datasheet for your package variant.

Features

LM1117 features (concise):
- Low dropout regulator: dropout about 1.2 V at 1 A.
- Output current: up to 1 A.
- Fixed and adjustable versions: fixed outputs (e.g., 3.3 V, 5 V, 12 V) and LM1117-ADJ for adjustable output.
- External resistors needed for adjust version.
- Input voltage range: up to ~15 V (max varies by variant); suitable for low-voltage rails.
- Quiescent current: typically a few milliamps.
- Good regulation: decent line and load regulation; accuracy around a couple percent.
- Protection: current limiting, thermal/shutdown protection, short-circuit protection.
- Package options: TO-220 and SOT-223 (surface-mount) widely used.
- Pinout (common): Vout, GND/Adj, Vin (pinout remains consistent across variants).

Package

LM1117 comes in multiple packages: through-hole TO‑220 and surface-mount options such as SOT‑223 and SOT‑89 (with some versions also in TO‑263/DPAK variants).

Pinout

LM1117 is a 3-pin, low-dropout (LDO) voltage regulator. It can provide a fixed or adjustable output from a higher input voltage.
Pinout (view from the front, pins down):
- Pin 1: Ground (fixed versions) or Adjust (ADJ) (adjustable variant)
- Pin 2: Output
- Pin 3: Input
Note: For fixed LM1117 parts (e.g., 3.3V, 5V), pin1 is GND, pin2 is Vout, pin3 is Vin. For the LM1117-ADJ variant, pin1 is ADJ, with external resistors setting the output.

Manufacturer

Manufacturer: Texas Instruments (TI). TI is an American multinational semiconductor company that designs and manufactures analog and digital integrated circuits. The LM1117 originally came from National Semiconductor, a U.S. semiconductor maker that TI acquired in 2011.

Application

- 1 A low-dropout linear regulator to generate 3.3 V or 5 V rails from higher supplies (6–15 V).
- Used as post- or pre-regulator in embedded systems, MCUs/SoCs, sensors, op-amps, ADC/DAC, and RF circuits.
- Adjustable version for custom output voltages; fixed versions (3.3 V, 5 V) are common.
- Suitable for battery-powered, consumer electronics, automotive and industrial equipment with proper input/output capacitors and thermal management.

Equivalent

Equivalents (pin-compatible 1117-family LDOs):
- AMS1117 (Analog Devices)
- LD1117 / LD1117V33 (STMicroelectronics)
- NCP1117 (ON Semiconductor)
- TLV1117 (Texas Instruments)
These share the same pinout (GND/Output/Input) and ~1 A rating, in packages like TO-220 and SOT-223. They come in fixed outputs (3.3 V, 5 V, 1.8 V, etc.) and adjustable variants, so any 1117-series regulator with the same footprint can be a drop-in replacement.

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