LM2596S-ADJ/NOPB 3A Step-Down Voltage Regulator

The LM2596S-ADJ/NOPB is a power management integrated circuit (PMIC) that functions as a Step-Down (Buck) Switching Regulator. It efficiently steps down higher input voltages to a lower, adjustable output voltage. Its high switching frequency allows for the use of smaller and less expensive inductors compared to older Generation converters, making it an ideal solution for compact, high-efficiency on-board power supplies.

Key Features

• Input Voltage Range: Wide operating range from 4.5V to 40V.
• Adjustable Output: Programmable output voltage from 1.2V to 37V.
• Output Current: Continuous current delivery up to 3A with excellent line and load regulation.
• Switching Frequency: Internal oscillator running at 150 kHz.
• Protection: Built-in Thermal Shutdown and Current Limit protection mechanisms.
• Standby Current: Exceptionally low standby power consumption, typically 80 μA.

Pinout Overview

The TO263-5 package (also known as D2PAK) offers excellent thermal dissipation through its exposed tab. The 5-pin configuration is as follows:

• Pin 1 (VIN): Power supply input voltage.
• Pin 2 (OUTPUT): Switching output (connects to the inductor and Schottky diode).
• Pin 3 (GND): System ground (the package tab is also internally connected to GND).
• Pin 4 (FEEDBACK): Feedback input to regulate the voltage (connects to the resistor divider).
• Pin 5 (ON/OFF): Logic enable input (Active LOW - ground this pin for continuous operation).

Technical Specifications

Typical Applications

• High-efficiency step-down regulators in consumer and industrial electronics.
• On-card switching regulators for local voltage Generation (e.g., 5V or 3.3V from a 12V/24V bus).
• Efficient pre-regulators for linear regulators.
• Designing custom battery chargers and power supplies.