The L4974A is a 3.5A switching regulator with an output voltage range of 5.1V to 40V, a duty cycle range of 0 to 90%, internal feed-forward line regulation, internal current limiting, precise 5.1V ± 2% on-chip reference, reset and power fail functions, input/output sync pin, under-voltage lockout with hysteric turn-on, PWM latch for single pulse per period, very high efficiency, switching frequency up to 200KHz, thermal shutdown, and continuous mode operation.
The L4974A is a stepdown monolithic power switching regulator capable of delivering 3.5A at an adjustable output voltage between 5.1V and 40V. Realized with BCD mixed technology, it utilizes a DMOS output transistor to achieve high efficiency and fast switching times up to 200kHz.
The device integrates several diagnostic and control functions suitable for microprocessor-based systems, including reset and power fail signals, feed-forward line regulation, soft start, current limiting, and thermal protection. It is packaged in a PowerDIP 16 + 2 + 2 plastic package requiring few external components.
| Output Current | 3.5A |
|---|---|
| Output Voltage Range | 5.1V to 40V |
| Switching Frequency | Up to 200kHz |
| Input Voltage Range | 15V to 50V (Operating) |
| Reference Voltage | 5.1V +2% |
| Package Type | PowerDIP 16 + 2 + 2 |
The device provides an output voltage variable from 5.1V to 40V.
The regulator supports a switching frequency up to 200kHz.
Yes, it features thermal shutdown that disables operation when junction temperature reaches about 150°C.