Overview
The L5970ADTR is a step-down monolithic power switching regulator produced by STMicroelectronics. This device is capable of delivering up to 1 A of DC current to the load, with a switch current limit of 1.5 A. The output voltage can be adjusted from 1.235 V to 35 V, making it versatile for various applications. The regulator uses an internal P-Channel D-MOS transistor with a typical RDS(on) of 200 mΩ, eliminating the need for a bootstrap capacitor and ensuring high efficiency. An internal oscillator sets the switching frequency at 500 kHz, which helps in minimizing the size of external components. It is particularly suitable for 5 V bus applications, common in computer-related systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Input Voltage | 4.4 | 36 | V | |
| Output Voltage Range | 1.235 | 35 | V | |
| Switching Frequency | 500 | KHz | ||
| Internal Switch Current Limit | 1.5 | A | ||
| Reference Voltage | 3.234 | 3.3 | 3.366 | V |
| Operating Junction Temperature Range | -40 | 150 | °C | |
| Maximum Thermal Resistance Junction-Ambient | 120 | °C/W |
Key Features
- Internal current limiting and pulse by pulse current limit with internal frequency modulation for short circuit protection
- Inhibit for zero current consumption
- Protection against feedback disconnection
- Synchronization capability
- Thermal shutdown
- Voltage feedforward
- Low dropout operation: 100% duty cycle
- Zero load current operation
- Internal P-Channel D-MOS transistor with a typical RDS(on) of 200 mΩ
Applications
- Consumer electronics: Set-top boxes, DVD players, TVs, VCRs, car radios, LCD monitors
- Networking: XDSL, modems, DC-DC modules
- Computer systems: Printers, audio/graphic cards, optical storage, hard disk drives
- Industrial applications: Chargers, car battery, DC-DC converters
Q & A
- What is the maximum output current of the L5970ADTR?
The L5970ADTR can deliver up to 1 A of DC current to the load.
- What is the adjustable output voltage range of the L5970ADTR?
The output voltage can be adjusted from 1.235 V to 35 V.
- What is the switching frequency of the L5970ADTR?
The switching frequency is internally fixed at 500 kHz.
- What type of transistor is used as the switching element in the L5970ADTR?
An internal P-Channel D-MOS transistor with a typical RDS(on) of 200 mΩ.
- What are the key protection features of the L5970ADTR?
Internal current limiting, protection against feedback disconnection, thermal shutdown, and inhibit for zero current consumption.
- What is the operating input voltage range of the L5970ADTR?
The operating input voltage range is from 4.4 V to 36 V.
- What is the reference voltage of the L5970ADTR?
The reference voltage is 3.3 V with a ±2% tolerance.
- Is the L5970ADTR suitable for high-efficiency applications?
Yes, it uses an internal P-Channel D-MOS transistor to avoid the need for a bootstrap capacitor, ensuring high efficiency.
- What are some common applications of the L5970ADTR?
Consumer electronics, networking, computer systems, and industrial applications.
- What is the maximum thermal resistance junction-ambient of the L5970ADTR?
The maximum thermal resistance junction-ambient is 120 °C/W.
