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LM2576S-5.0

3A SIMPLE SWITCHER buck regulator, 7-40V input, fixed 5V output, 52kHz, TO-263-5

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Pieza del fabricante：

LM2576S-5.0

Paquete：

TO-263-5 (D2PAK, 10.16 x 8.42 x 4.83mm)

Marca：
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Compromiso de calidad
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Descripción

Productos

The LM2576S-5.0 is a SIMPLE SWITCHER 40V, 3A step-down voltage regulator from Texas Instruments with fixed 5V output, 52kHz switching frequency, in a TO-263-5 surface-mount package.

Especificaciones

Output Voltage 5V fixed (±4% over line and load)
Input Voltage Range 7V to 40V
Corriente de salida 3A
Switching Frequency 52kHz fixed
Corriente de reposo 5mA typical (50µA standby)
Efficiency 77% typical (VIN=12V, VOUT=5V, IOUT=3A)
Topology Buck (step-down), voltage-mode PWM
Shutdown Yes (ON/OFF pin, TTL compatible)
Protection Cycle-by-cycle current limit, thermal shutdown
Temperatura de funcionamiento -40°C to +125°C (junction)
Paquete TO-263-5 (D2PAK, surface-mount)

Características

  • Fixed 5V output with ±4% accuracy, no external divider needed
  • Only 4 external components required
  • 3A output current with internal power switch
  • 52kHz fixed-frequency oscillator
  • TTL-compatible ON/OFF shutdown with 50µA standby
  • Cycle-by-cycle current limit and thermal shutdown
  • Industry-standard SIMPLE SWITCHER pinout
  • Surface-mount D2PAK package for automated assembly

Aplicaciones

  • 5V logic power from 12V or 24V input
  • Efficient linear regulator replacement
  • Automotive and battery-powered systems
  • Industrial and telecom point-of-load
  • Distributed power architectures

The LM2576S-5.0 is a fixed 5V output version of the SIMPLE SWITCHER family from Texas Instruments, providing a complete 3A step-down switching regulator requiring only 4 external components. The fixed 5V output eliminates the need for an external resistor divider, simplifying the design. The device operates from 7V to 40V input with 52kHz fixed switching frequency. Internal features include cycle-by-cycle current limiting, thermal shutdown, and output transistor safe-area compensation. The TTL-compatible ON/OFF pin allows shutdown with only 50µA standby current. The surface-mount TO-263-5 (D2PAK) package is ideal for automated PCB assembly.

The LM2576S-5.0 uses a fixed-frequency voltage-mode PWM control scheme identical to the adjustable version but with an internal resistor divider that sets the output to 5V. The FB pin is internally connected to the junction of two precision resistors that divide the 5V output down to the 1.23V reference level. When the output voltage is above the setpoint, the error amplifier reduces the switch duty cycle, decreasing the output voltage. When below the setpoint, the duty cycle increases. The internal NPN Darlington switch handles up to 3A output current with a saturation voltage of approximately 1.5V at full load. The external catch diode (Schottky recommended for efficiency) provides a current path during the switch off-time. Under overload conditions, cycle-by-cycle current limiting caps the peak switch current at approximately 4.5A. Under short-circuit conditions, the switching frequency drops to approximately 11kHz to prevent inductor saturation. The thermal shutdown activates at approximately 170°C junction temperature.

Pin Nombre Tipo Descripción
1 VIN Potencia Input supply (7V-40V), bypass with 100µF
2 OUTPUT Potencia Switch output (connect to inductor and diode)
3 GND Potencia Ground (tab is also GND)
4 FEEDBACK Entrada Feedback (connect directly to output for fixed 5V)
5 ON/OFF Entrada Shutdown control (low=on, high=shutdown)
  • 5V Logic Power: Fixed 5V output directly powers TTL, CMOS, and MCU from 12V or 24V without external divider
  • Automotive 12V to 5V: 40V input handles load dump; 3A output powers navigation, telematics, and ECU logic
  • Industrial 24V to 5V: 77% efficiency and minimal heatsink replace bulky linear regulators in DIN-rail supplies
  • Battery Systems: 50µA standby via ON/OFF pin extends battery life in portable and backup systems
  • Distributed Power: Simple 4-component solution generates local 5V rail from higher-voltage distribution bus
Modelo Fabricante Diferencia clave Paquete Specs
LM2576S-5.0/NOPB TI RoHS compliant version - -
LM2576T-5.0 TI TO-220 through-hole version - -
LM2576HVS-5.0 TI HV version, 60V input max - -
LM2676-5.0 TI 260kHz, higher efficiency (94%), TO-263 - -
LMR33630ADDAR TI 3A, 1MHz synchronous, QFN, modern replacement - -
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