Overview
The L5970D013TR is a step-down monolithic power switching regulator produced by STMicroelectronics. This device is capable of delivering up to 1A of output current at output voltages ranging from 1.2V to 35V. It operates with an input voltage range of 4.4V to 36V, making it particularly suitable for applications with a 5V bus, such as those found in computer-related systems. The L5970D features an internal P-Channel D-MOS transistor with a typical Rdson of 250mΩ, minimizing the size of external components. The device includes an internal oscillator that fixes the switching frequency at 250KHz and offers various protection features, including thermal shutdown, feedback disconnection protection, and internal current limiting.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Input Voltage | 4.4 | - | 36 | V |
| Output Current | - | - | 1A | A |
| Output Voltage Range | 1.2 | - | 35 | V |
| Switching Frequency | 212 | 250 | 280 | KHz |
| Mosfet On Resistance (Rdson) | 0.250 | - | 0.5 | Ω |
| Maximum Junction Temperature | -40 | - | 150 | °C |
| Power Dissipation at TA ≤ 60°C | - | - | 0.75 | W |
| Thermal Resistance Junction-Ambient | - | - | 120 | °C/W |
Key Features
- Up to 1A output current
- Operating input voltage from 4.4V to 36V
- 3.3V (±2%) reference voltage
- Output voltage adjustable from 1.2V to 35V
- Low dropout operation: 100% duty cycle
- Internally fixed 250KHz switching frequency
- Voltage feedforward and zero load current operation
- Internal current limiting and inhibit for zero current consumption
- Synchronization capability
- Protection against feedback disconnection and thermal shutdown
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: Battery chargers, DC-DC converters
Q & A
- What is the maximum output current of the L5970D?
The L5970D can deliver up to 1A of output current.
- What is the input voltage range for the L5970D?
The input voltage range is from 4.4V to 36V.
- What is the adjustable output voltage range of the L5970D?
The output voltage can be adjusted from 1.2V to 35V.
- What is the switching frequency of the L5970D?
The switching frequency is internally fixed at 250KHz.
- Does the L5970D have built-in protection features?
Yes, it includes protection against feedback disconnection, thermal shutdown, and internal current limiting.
- How does the inhibit function work on the L5970D?
The inhibit function is activated by a logical signal (active high) that disables the device. If not used, the pin must be grounded.
- What is the typical Mosfet on resistance (Rdson) of the L5970D?
The typical Rdson is 250mΩ.
- What are the thermal characteristics of the L5970D?
The maximum junction temperature is 150°C, and the thermal resistance junction-ambient is 120°C/W.
- What package options are available for the L5970D?
The L5970D is available in SO8 packages, including tube and tape and reel options.
- What are some common applications for the L5970D?
Common applications include consumer electronics, networking devices, computer peripherals, and industrial equipment.
