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LM2596

3A step-down buck regulator, 4.5-40V input, 150kHz, up to 92% efficiency

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Pieza del fabricante：

LM2596

Paquete：

TO-263-5 (D2PAK) / TO-220-5

Marca：
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Compromiso de calidad
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Descripción

Productos

The LM2596 from Texas Instruments is a 3A step-down (buck) switching voltage regulator available in fixed output versions (3.3V, 5V, 12V) and an adjustable version (1.2V to 37V). Operating at 150kHz switching frequency, it provides high efficiency up to 92% in a 5-pin TO-263 or TO-220 package.

Especificaciones

Corriente de salida 3A
Input Voltage 4.5V to 40V
Output Voltage 3.3V/5V/12V fixed or 1.2-37V adjustable
Switching Frequency 150kHz
Efficiency Up to 92%
Line Regulation 0.5% (typ)
Load Regulation 1% (typ)
Paquete TO-263-5 (D2PAK) / TO-220-5
Temperatura de funcionamiento -40 to +125 C

Características

  • 3A output current capability
  • 150kHz fixed switching frequency
  • Internal thermal shutdown and current limiting
  • Requires only 4 external components
  • Adjustable and fixed output versions
  • Standby mode with 50uA quiescent current

Aplicaciones

  • Automotive and battery-powered systems
  • Distributed power architectures
  • Pre-regulator for linear regulators
  • Positive-to-negative conversion (buck-boost)

The LM2596 is a monolithic integrated circuit from Texas Instruments that provides all the active functions for a step-down (buck) switching regulator capable of driving a 3A load with excellent line and load regulation. Available in fixed 3.3V, 5V, 12V output versions and an adjustable version (1.2V to 37V), it requires a minimum number of external components. The 150kHz switching frequency allows the use of smaller and lower cost inductors and capacitors. Internal features include thermal shutdown, current limiting, and an on/off standby mode that reduces quiescent current to 50uA.

The LM2596 uses a fixed-frequency pulse-width modulation (PWM) control scheme operating at 150kHz. The internal power switch (Darlington NPN) connects the input voltage to the output inductor during the on-time, storing energy in the inductor’s magnetic field. During the off-time, the inductor current flows through the external catch diode to the load and output capacitor. The feedback comparator monitors the output voltage and adjusts the duty cycle to maintain regulation. Current mode control provides inherent cycle-by-cycle current limiting. The thermal shutdown circuit disables the switch when junction temperature exceeds approximately 150C.

Pin Nombre Función
1 VIN Input supply voltage (4.5-40V)
2 OUTPUT Switch output (connect to inductor)
3 GND Suelo
4 FEEDBACK Output voltage feedback (connect to output or resistor divider)
5 ON/OFF Shutdown control (LOW = on, HIGH = off)
  • Automotive 12V/24V to 5V/3.3V power conversion for MCU and logic rails
  • Battery-powered equipment needing efficient voltage step-down
  • Industrial distributed power converting 24V bus to lower voltages
  • Pre-regulator feeding an LDO for clean, efficient power supply design
Modelo Fabricante Diferencia clave
LM2596HV TI High-voltage version, up to 60V input
LM2676 TI 3A, 260kHz, synchronous version
MP1584EN MPS 4A, 1.5MHz, smaller inductor
XL4015 XLSEMI 5A, 180kHz, higher current
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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