Overview
The L5973ADTR, produced by STMicroelectronics, is a step-down monolithic power switching regulator. This device features a switch current limit of 2 A, enabling it to deliver more than 1.5 A DC current to the load, depending on the application conditions. The output voltage can be adjusted from 1.235 V to 35 V, making it versatile for various applications. The regulator is housed in a PowerSO-8 package with an exposed frame, which helps reduce thermal resistance to approximately 40 °C/W. It includes an internal P-Channel D-MOS transistor with a typical on-resistance of 200 mΩ, eliminating the need for a bootstrap capacitor and ensuring high efficiency. The internal oscillator fixes the switching frequency at 500 kHz, minimizing the size of external components.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Switch Current Limit | 2 A | A |
| Operating Input Voltage Range | 4 V to 36 V | V |
| Output Voltage Range | 1.235 V to 35 V | V |
| Reference Voltage | 3.3 V (±2%) | V |
| Switching Frequency | 500 kHz | kHz |
| Mosfet On Resistance | 200 mΩ | mΩ |
| Maximum Thermal Resistance (Junction-Ambient) | 40 °C/W | °C/W |
| Operating Junction Temperature Range | -40 to 150 °C | °C |
Key Features
- Inhibit for zero current consumption
- Internal current limiting
- Protection against feedback disconnection
- Synchronization
- Thermal shutdown
- Voltage feedforward
- Low dropout operation: 100% duty cycle
- Zero load current operation
- Internal P-Channel D-MOS transistor with a typical on-resistance of 200 mΩ
Applications
- Consumer: Set-top boxes, DVD players, TVs, VCRs, car radios, LCD monitors
- Networking: XDSL, modems, DC-DC modules
- Computer: Printers, audio/graphic cards, optical storage, hard disk drives
- Industrial: Chargers, car battery, DC-DC converters
Q & A
- What is the switch current limit of the L5973ADTR?
The switch current limit of the L5973ADTR is 2 A.
- What is the operating input voltage range of the L5973ADTR?
The operating input voltage range is from 4 V to 36 V.
- What is the adjustable output voltage range of the L5973ADTR?
The output voltage can be adjusted from 1.235 V to 35 V.
- What is the switching frequency of the L5973ADTR?
The switching frequency is internally fixed at 500 kHz.
- Does the L5973ADTR have thermal shutdown protection?
- Can the L5973ADTR be synchronized with an external signal?
- What is the typical on-resistance of the internal P-Channel D-MOS transistor?
The typical on-resistance is 200 mΩ.
- What is the maximum thermal resistance (junction-ambient) of the L5973ADTR?
The maximum thermal resistance is approximately 40 °C/W.
- What are some common applications for the L5973ADTR?
Common applications include consumer electronics, networking devices, computer peripherals, and industrial equipment.
- Does the L5973ADTR have protection against feedback disconnection?
