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LM2596SX-3.3

3A SIMPLE SWITCHER buck, 3.3V fixed, 150kHz, TO-263

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Pieza del fabricante：

LM2596SX-3.3

Paquete：

TO-263-5

Marca：
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Descripción

Productos

The LM2596SX-3.3 from TI is a 3A SIMPLE SWITCHER step-down regulator with 3.3V fixed output and 150kHz switching in a TO-263-5 package for efficient 3.3V power supply conversion.

Especificaciones

Paquete TO-263-5

Características

  • See datasheet for complete specifications
  • Industry-standard package

Aplicaciones

  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Automotive electronics

The LM2596SX-3.3 from TI is a 3A SIMPLE SWITCHER step-down regulator with 3.3V fixed output and 150kHz switching in a TO-263-5 package for efficient 3.3V power supply conversion.

The LM2596SX-3.3 is a 3A step-down (buck) switching regulator from Texas Instruments in TO-263 (D2PAK), providing a fixed 3.3V output from 4.5-40V input at 150kHz fixed frequency. The SIMPLE SWITCHER family is designed for minimal external components: one inductor (68uH), one Schottky diode (5A/40V like 1N5824), input capacitor (680uF electrolytic), and output capacitor (220uF electrolytic). The internal architecture uses current-mode control: an error amplifier compares the FB voltage with the 1.23V internal reference (through an internal resistor divider for the fixed-voltage version); the error amplifier output controls the peak inductor current; the 150kHz oscillator sets the maximum duty cycle (approximately 90%). The switch is a 3A NPN Darlington with 1.5V saturation voltage at 3A (higher than MOSFET-based converters, reducing efficiency). The typical efficiency is 80% at 12V input and 3A load. The switch current limit is 4.5A (peak) for startup inrush and transient loads. The ON/OFF pin provides logic-level shutdown: pulling HIGH (above 1.3V) turns off the switch and reduces supply current to 50uA. The device has thermal shutdown at 165C and overcurrent protection with hiccup mode. The TO-263 package provides 2C/W junction-to-tab thermal resistance, allowing 3W dissipation on a 2oz copper pour. The -SX-3.3 suffix specifies TO-263, 3.3V fixed output. The LM2596 is one of the most popular buck regulators in the industry, used in automotive, industrial, and consumer applications.

Pin Nombre Tipo Función
1 VIN Potencia Input supply (4.5-40V, connect with 680uF electrolytic and 0.1uF ceramic)
2 OUTPUT Salida Switch output (connects to inductor, 3A peak, 150kHz switching)
3 GND Potencia Ground (connect tab to ground plane for heatsinking)
4 FB Entrada Feedback (connect directly to output for 3.3V fixed, or resistor divider for adj)
5 ON/OFF Entrada Shutdown control (LOW=on, HIGH=shutdown, 50uA Iq, internal pull-down)
  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Automotive electronics
    • Fabricante Número de pieza Paquete Notas
    Texas Instruments LM2596SX-3.3 TO-263 Same device, TI brand
    Texas Instruments LM2596SX-5.0 TO-263 5V fixed version
    Texas Instruments LM2596SX-ADJ TO-263 Adjustable version (1.23-37V)
    onsemi NCV2596SV-3.3G TO-263 Automotive version, AEC-Q100, onsemi
    Monolithic Power MP1584EN-LF-Z SOIC-8E 3A 28V buck, 1.5MHz, smaller, MP brand
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