L5970D is a low dropout step down monolithic power switching regulator from STMicroelectronics that can deliver up to 1A at output voltages from 1.2V to 35V. The device uses an internal P-Channel D-MOS transistor (with a typical Rdson of 250mΩ) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250KHz. Having a minimum input voltage of 4.4V only, it is particularly suitable for 5V bus, available in all computer related applications. Pulse by pulse current limit with the internal fre- quency modulation offers an effective constant current short circuit protection.
The L5970D is a monolithic step‑down switching regulator capable of delivering up to 1 A across a wide output voltage range (1.2 V to 35 V). It uses an internal P‑Channel D‑MOS transistor and a fixed 250 kHz oscillator, making it suitable for 5 V bus applications and a variety of consumer, networking, computer, and industrial products.
The datasheet provides detailed pin‑out information, electrical characteristics, mechanical dimensions, and example application circuits, including dual‑output and buck‑boost configurations. It also includes a demo‑board schematic and component list for reference designs.
| Maximum Output Current | 1 A |
|---|---|
| Output Voltage Range | 1.2 V – 35 V |
| Input Voltage Range | 4.4 V – 36 V |
| Switching Frequency | 250 kHz (fixed) |
| MOSFET Rdson | 250 mΩ (typical) |
| Thermal Resistance (junction‑to‑ambient) | max 120 °C/W |
The device can deliver up to 1 A of output current.
The regulator operates at a fixed switching frequency of 250 kHz.
It accepts an input voltage from 4.4 V to 36 V.
The output voltage is adjustable between 1.2 V and 35 V.