Overview
The L5970AD is a step-down monolithic power switching regulator produced by STMicroelectronics. It is designed to deliver up to 1 A of DC current to the load, with a switch current limit of 1.5 A. The device features an internal P-Channel D-MOS transistor with a typical RDS(on) of 200 mΩ, which helps in achieving high efficiency and eliminates the need for a bootstrap capacitor. The output voltage can be adjusted from 1.235 V to 35 V, making it versatile for various applications. The regulator operates with an internally fixed switching frequency of 500 kHz, which minimizes the size of external components required.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Input Voltage | 4.4 | 36 | V | |
| Output Voltage Range | 1.235 | 35 | V | |
| Output Current Limit | 1.5 | A | ||
| Switching Frequency | 500 | KHz | ||
| Mosfet On Resistance (RDS(on)) | 0.250 | 0.5 | Ω | |
| Reference Voltage | 3.234 | 3.3 | 3.366 | V |
| Operating Junction Temperature Range | -40 | 150 | °C | |
| Package Type | SO-8 |
Key Features
- Internal current limiting and pulse-by-pulse current limit for short circuit protection.
- Protection against feedback disconnection and thermal shutdown.
- Inhibit function for zero current consumption.
- Synchronization capability.
- Voltage feedforward and low dropout operation with 100% duty cycle.
- Zero load current operation.
- 3.3 V reference voltage with ±2% accuracy.
Applications
- Consumer electronics: Set-top boxes, DVD players, TVs, VCRs, car radios, LCD monitors.
- Networking: XDSL, modems, DC-DC modules.
- Computer peripherals: Printers, audio/graphic cards, optical storage, hard disk drives.
- Industrial applications: Chargers, car battery chargers, DC-DC converters.
Q & A
- What is the maximum output current of the L5970AD?
The L5970AD can deliver up to 1 A of DC current to the load, with a switch current limit of 1.5 A.
- What is the adjustable output voltage range of the L5970AD?
The output voltage can be adjusted from 1.235 V to 35 V.
- What is the switching frequency of the L5970AD?
The switching frequency is internally fixed at 500 kHz.
- What type of transistor is used in the L5970AD?
The device uses an internal P-Channel D-MOS transistor.
- What are the key protection features of the L5970AD?
The device includes internal current limiting, protection against feedback disconnection, and thermal shutdown.
- What is the operating input voltage range of the L5970AD?
The operating input voltage range is from 4.4 V to 36 V.
- What is the reference voltage provided by the L5970AD?
The device provides a 3.3 V reference voltage with ±2% accuracy.
- What are some common applications of the L5970AD?
Common applications include consumer electronics, networking devices, computer peripherals, and industrial applications.
- What is the package type of the L5970AD?
The L5970AD is available in an SO-8 package.
- What is the operating junction temperature range of the L5970AD?
The operating junction temperature range is from -40°C to 150°C.
