LT1117IST-3.3#PBF

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LT1117IST-3.3#PBF

IC REG LIN 3.3V 800MA SOT223-3

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Spezifikationen

Package Tube
ProductStatus Active
OutputConfiguration Positive
OutputType Fixed
NumberofRegulators 1
Voltage-Input(Max) 15V
Voltage-Output(Min/Fixed) 3.3V
VoltageDropout(Max) 1.3V @ 800mA
Current-Output 800mA
Current-Quiescent(Iq) 10 mA
PSRR 75dB (120Hz)
ProtectionFeatures Over Temperature
OperatingTemperature -40°C ~ 125°C
MountingType Surface Mount
Package/Case TO-261-4, TO-261AA

Übersicht

Description

LT1117IST-3.3#PBF is a fixed-output low-dropout regulator (LDO) from Linear Technology (now Analog Devices). It provides a stable 3.3 V output from a higher input rail with up to about 1 A load capability (heat and input range permitting).
Key points:
- Output: fixed 3.3 V. Input up to 15 V. Dropout ≈ 1.1–1.3 V at high load.
- Package/finish: IST variant, Pb-free (PBF).
- Pinout (fixed version, typical): Pin 1 = Ground, Pin 2 = Output, Pin 3 = Input.
- Stability: requires appropriate input and output capacitors (typically a 10 µF or larger capacitor on the output with suitable ESR; input capacitor close to the regulator is recommended).
- Applications: 3.3 V power rail for microcontrollers, sensors, DAC/ADC ICS, and other low-power electronics.
Notes:
- The exact thermal/current limits depend on package and board layout; ensure adequate heat dissipation.
- Always consult the latest datasheet for precise specs and recommended capacitor ESR ranges.

Features

Here are the main features of LT1117IST-3.3#PBF (Pb-Free):
- Fixed 3.3V output (LT1117 family) in IST package.
- Output current up to ~1A with internal current limit and thermal shutdown protection.
- Low dropout: about 1.2V at 1A (high efficiency at light loads).
- Wide input range compatible with typical supplies up to ~15V (20V max absolute).
- Low quiescent current (roughly a few milliamps).
- Requires an output capacitor for stability (minimum 10 μF; use tantalum/aluminum with ESR ~0.1–1 Ω).
- Good line and load regulation; fast transient response.
- Industrial temperature range (-40°C to 125°C).
- Pb-Free / Halogen-Free (PBF) packaging.

Package

SOT-223 package (Pb-free, PBF).

Pinout

- Pin count: 3 pins (SOT-223/IST package), plus a tab (tab connected to Vout).
- Pin functions (left to right with front facing you):
- Pin 1: Ground (GND)
- Pin 2: Output (Vout = 3.3V)
- Pin 3: Input (Vin)
- Tab: Output (Vout)
Pb-free variant: LT1117IST-3.3#PBF.

Manufacturer

- Manufacturer: Analog Devices, Inc. (ADI). The LT1117 family was originally from Linear Technology and is now produced under Analog Devices after the acquisition of Linear Technology.
- What kind of company: A US-based multinational semiconductor company that designs and manufactures analog, mixed-signal, and DSP integrated circuits (e.g., power management, data converters, amplifiers, op-amps).

Application

LT1117IST-3.3#PBF is a 3.3 V fixed, 1 A low-dropout regulator. Common application areas:
- Regulate a 3.3 V rail from higher input supplies (5–15 V) in embedded systems.
- Local power for MCUs, DSPs, FPGAs, memory and other 3.3 V logic.
- Power‑supply stages in consumer electronics (routers, modems, set‑top boxes, development boards).
- Battery-powered devices from Li‑ion/USB sources needing a stable 3.3 V rail.
- Analog front‑ends and biasing requiring a clean 3.3 V supply.

Equivalent

Common equivalents (3.3V fixed LDO, 1 A, similar pinout) to LT1117IST-3.3#PBF:
- LM1117-3.3
- LD1117V33
- AMS1117-3.3
- AZ1117-3.3
- AP1117-3.3
- NCP1117-3.3
These are widely used drop-in replacements (SOT-223/TO-220) with the same pinout. Verify packaging and datasheets for exact pinout and thermal specs.

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