規格
| 屬性 | 價值 |
| Package | Bulk |
| ProductStatus | Active |
| Function | Step-Down |
| OutputConfiguration | Positive |
| Topology | Buck |
| OutputType | Fixed |
| NumberofOutputs | 1 |
| Voltage-Input(Min) | 4V |
| Voltage-Input(Max) | 40V |
| Voltage-Output(Min/Fixed) | 5V |
| Current-Output | 3A |
| Frequency-Switching | 52kHz |
| SynchronousRectifier | No |
| OperatingTemperature | -40°C ~ 125°C (TJ) |
| MountingType | Through Hole |
| Package/Case | TO-220-5 |
概述
Description
LM2576-5.0WT is a fixed-output (5 V) buck regulator from the LM2576 family. It contains a high‑side switch and control circuitry; you must add external components to make a complete switching regulator.
Key specs
- Input voltage: up to 40 V
- Output: fixed 5 V
- Switch current: up to 3 A
- Switching frequency: about 52 kHz
- Efficiency: typically 75–90% depending on conditions
- Protection: overcurrent/thermal shutdown and undervoltage lockout
External components (typical)
- Freewheeling diode: fast Schottky, rated >3 A and >40 V
- Inductor: ~100 μH (design depends on ripple/current)
- Input capacitor: low-ESR, ~100 μF or more
- Output capacitor: low-ESR, several tens to ~120 μF
- Proper heat sinking and PCB layout are important for stability and noise
Package note
- WT denotes a specific packaging variant of the LM2576-5.0; check the datasheet for exact pinout and mounting details.
Applications
- 5 V power rails from automotive or higher-voltage DC sources, microcontroller supplies, and general low-cost buck conversions.
Key specs
- Input voltage: up to 40 V
- Output: fixed 5 V
- Switch current: up to 3 A
- Switching frequency: about 52 kHz
- Efficiency: typically 75–90% depending on conditions
- Protection: overcurrent/thermal shutdown and undervoltage lockout
External components (typical)
- Freewheeling diode: fast Schottky, rated >3 A and >40 V
- Inductor: ~100 μH (design depends on ripple/current)
- Input capacitor: low-ESR, ~100 μF or more
- Output capacitor: low-ESR, several tens to ~120 μF
- Proper heat sinking and PCB layout are important for stability and noise
Package note
- WT denotes a specific packaging variant of the LM2576-5.0; check the datasheet for exact pinout and mounting details.
Applications
- 5 V power rails from automotive or higher-voltage DC sources, microcontroller supplies, and general low-cost buck conversions.
Equivalent
Equivalents for LM2576-5.0WT (5V fixed, 3A buck) include:
- XL2576-5.0 (Xlsemi) — pin-for-pin drop-in replacement.
- LM2596-5.0 / LM2596S-5.0 (TI) — widely used fixed-5V buck (not pin-compatible with LM2576).
- Other vendor cross-references exist; always verify pinout, packaging, and external components.
- XL2576-5.0 (Xlsemi) — pin-for-pin drop-in replacement.
- LM2596-5.0 / LM2596S-5.0 (TI) — widely used fixed-5V buck (not pin-compatible with LM2576).
- Other vendor cross-references exist; always verify pinout, packaging, and external components.
Features
LM2576-5.0WT features (concise):
- 3 A step-down regulator with fixed 5.0 V output
- Input voltage range: 4 V to 40 V
- Switching frequency: ~52 kHz
- Very low component count: external inductor, Schottky catch diode, input/output capacitors
- High efficiency (typical ~80–90% depending on input/output conditions)
-Internal protection: current limit and thermal shutdown
- Short-circuit protection and safe startup
- Simple, easy-to-use design suitable for compact boards
- Package: TO-220 style (WT designation), tab connected to output
Note: For exact pinout and recommended external components, refer to the LM2576-5.0WT datasheet.
- 3 A step-down regulator with fixed 5.0 V output
- Input voltage range: 4 V to 40 V
- Switching frequency: ~52 kHz
- Very low component count: external inductor, Schottky catch diode, input/output capacitors
- High efficiency (typical ~80–90% depending on input/output conditions)
-Internal protection: current limit and thermal shutdown
- Short-circuit protection and safe startup
- Simple, easy-to-use design suitable for compact boards
- Package: TO-220 style (WT designation), tab connected to output
Note: For exact pinout and recommended external components, refer to the LM2576-5.0WT datasheet.
Pinout
LM2576-5.0WT is a fixed 5 V buck regulator in a 5-pin package (TO-220/TO-263 style). Pinout (left-to-right with front face up):
- Pin 1: Vin – unregulated input supply
- Pin 2: Switch Output (Vsw) – internal switch node to external inductor/diode
- Pin 3: Ground – common reference
- Pin 4: Feedback (FB) – sense input (used for adjustable versions; fixed version internally tied)
- Pin 5: On/Off – enable control (logic high enables)
It provides up to ~3 A switching current and requires external inductor, catch diode, and input/output capacitors for proper operation.
- Pin 1: Vin – unregulated input supply
- Pin 2: Switch Output (Vsw) – internal switch node to external inductor/diode
- Pin 3: Ground – common reference
- Pin 4: Feedback (FB) – sense input (used for adjustable versions; fixed version internally tied)
- Pin 5: On/Off – enable control (logic high enables)
It provides up to ~3 A switching current and requires external inductor, catch diode, and input/output capacitors for proper operation.
Manufacturer
- Manufacturer: Texas Instruments (TI).
- What kind of company: an American multinational semiconductor company that designs and manufactures integrated circuits and related electronics components (formerly National Semiconductor, the LM2576’s original designer).
- What kind of company: an American multinational semiconductor company that designs and manufactures integrated circuits and related electronics components (formerly National Semiconductor, the LM2576’s original designer).
Application
LM2576-5.0WT is a fixed 5V, step-down (buck) regulator. Key application areas:
- DC-DC converters from 4–40V inputs to a 5V rail (up to ~3A with external inductor, diode and capacitors)
- Automotive and industrial power supplies (12–24V systems to 5V)
- Battery-powered and portable devices needing a compact 5V source
- Power rails for microcontrollers, DSPs, FPGAs, SBCs, and embedded systems
- Consumer electronics (set-top boxes, routers, printers, displays)
- Telecom and instrumentation equipment
- Solar/alternative-energy front ends providing 5V rails
Note: uses external components and is non-isolated.
- DC-DC converters from 4–40V inputs to a 5V rail (up to ~3A with external inductor, diode and capacitors)
- Automotive and industrial power supplies (12–24V systems to 5V)
- Battery-powered and portable devices needing a compact 5V source
- Power rails for microcontrollers, DSPs, FPGAs, SBCs, and embedded systems
- Consumer electronics (set-top boxes, routers, printers, displays)
- Telecom and instrumentation equipment
- Solar/alternative-energy front ends providing 5V rails
Note: uses external components and is non-isolated.
Package
TO-220 through-hole package (with the metal tab).
