Overview
The L5973D is a step-down monolithic power switching regulator produced by STMicroelectronics. This component is designed to deliver high current efficiency and is capable of handling a minimum switch current limit of 2.5 A, enabling it to deliver more than 2 A of DC current to the load under various application conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Input Voltage Range | 4 to 36 | V |
| Output Voltage Range | 1.235 to 35 | V |
| Maximum Output Current Limit | 2.5 to 3.5 | A |
| Switching Frequency | 212 to 280 | kHz |
| Mosfet On Resistance | 0.250 to 0.5 | Ω |
| Operating Junction Temperature Range | -40 to 150 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Maximum Thermal Resistance Junction-Ambient | 40 | °C/W |
Key Features
- Internal 2.5 A switch
- Low dropout operation: 100% duty cycle
- Internally fixed switching frequency of 250 kHz
- Voltage feedforward and zero load current operation
- Internal current limiting and thermal shutdown
- Inhibit function for zero current consumption
- Synchronization capability
- Protection against feedback disconnection
Applications
- Consumer electronics: Set-top boxes (STB), 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: Battery chargers, car batteries, DC-DC converters
Q & A
- What is the maximum output current of the L5973D?
The L5973D can deliver up to 2.5 A of output current. - What is the operating input voltage range of the L5973D?
The operating input voltage range is from 4 V to 36 V. - What is the switching frequency of the L5973D?
The switching frequency is internally fixed at 250 kHz. - Does the L5973D have thermal protection?
Yes, it has thermal shutdown protection. - How do you adjust the output voltage of the L5973D?
The output voltage can be adjusted using an external resistive divider connected to the feedback input pin. - What is the purpose of the INH pin on the L5973D?
The INH pin is used to inhibit the device; it is active high and must be grounded if not used. - Can the L5973D operate at 100% duty cycle?
Yes, it supports low dropout operation with 100% duty cycle. - What are the typical applications of the L5973D?
It is used in consumer electronics, networking devices, computer peripherals, and industrial applications. - Does the L5973D have synchronization capability?
Yes, it supports master/slave synchronization. - What is the maximum thermal resistance junction-ambient for the L5973D?
The maximum thermal resistance junction-ambient is 40 °C/W.
