Overview
The L4970A is a stepdown monolithic power switching regulator produced by STMicroelectronics. It delivers up to 10A of output current with an output voltage range of 5.1 to 40V. This device is realized using BCD mixed technology, which integrates Bipolar, CMOS, and DMOS power components on the same chip. The L4970A features a DMOS output transistor, ensuring very high efficiency and fast switching times. It includes various protection and regulation functions such as reset and power fail for microprocessors, feed-forward line regulation, soft start, current limiting, and thermal protection. The device is packaged in a 15-lead multiwatt plastic power package and requires few external components for operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Current | 10 | A |
| Output Voltage Range | 5.1 to 40 | V |
| Duty Cycle Range | 0 to 90% | |
| Switching Frequency | Up to 500KHz | |
| Input Voltage Range | 15 to 50 | V |
| Reference Voltage | 5.1V ± 2% | |
| Thermal Shutdown | Approx. 150°C | |
| Package Type | 15-lead Multiwatt Plastic Power Package | |
| Total Power Dissipation | 30 W (at Tcase < 120°C) | |
| Junction and Storage Temperature | -40 to 150 °C |
Key Features
- Very high efficiency and fast switching times using DMOS output transistor
- Reset and power fail functions for microprocessors
- Feed-forward line regulation
- Soft start function to prevent output overcurrents at turn-on
- Internal current limiting and thermal protection
- Under voltage lock out with hysteresis turn-on
- Input/output sync pin for synchronization
- PWM latch for single pulse per period
- Continuous mode operation
- Precise 5.1V ± 2% on-chip reference voltage
Applications
The L4970A is suitable for various high-current applications, including automotive and industrial systems. Its high reliability, efficiency, and robust protection features make it ideal for use in power supplies, DC-DC converters, and other power management systems where high current output and precise voltage regulation are required.
Q & A
- What is the maximum output current of the L4970A?
The L4970A can deliver up to 10A of output current. - What is the output voltage range of the L4970A?
The output voltage range is from 5.1 to 40V. - What is the switching frequency range of the L4970A?
The switching frequency can go up to 500KHz. - What type of technology is used in the L4970A?
The L4970A is realized using BCD mixed technology, integrating Bipolar, CMOS, and DMOS power components. - What are the key protection features of the L4970A?
The device includes reset and power fail functions, feed-forward line regulation, soft start, internal current limiting, and thermal protection. - What is the package type of the L4970A?
The L4970A is packaged in a 15-lead multiwatt plastic power package. - What is the total power dissipation of the L4970A at Tcase < 120°C?
The total power dissipation is 30 W. - What is the junction and storage temperature range of the L4970A?
The junction and storage temperature range is -40 to 150 °C. - Can multiple L4970A devices be synchronized?
Yes, multiple L4970A devices can be synchronized by connecting their input sync pins together or via an external sync pulse. - What is the reference voltage precision of the L4970A?
The on-chip reference voltage is precise to 5.1V ± 2%.
