STMicroelectronics L4971 Step-Down Mono Power Switching Regulators
STMicroelectronics L4971 Step-Down Monolithic Power Switching Regulators deliver 1.5A at an output voltage adjustable from 3.3V to 50V. The voltage is selected by a simple external divider. The L4971 uses an internal power D-MOS transistor with a typical RDSON of 0.25Ω. This obtains a very high efficiency and high switching speed with an achievable switching frequency up to 300KHz. The maximum power dissipation of the packages must be observed. A wide 8V to 55V input voltage range and output voltages regulated from 3.3V to 50V cover the majority of today's applications.
Features
- Up to 1.5a step down converter
- Operating input voltage from 8V to 55V
- Precise 3.3V (±1%) internal reference voltage
- Output voltage adjustable from 3.3V to 50V
- Switching frequency adjustable up to 300kHz
- Zero load current operation
- Voltage feed-forward
- Internal current limiting (pulse by pulse and hiccup mode)
- Inhibit for zero current consumption
- Protection against feedback disconnection
- Thermal shutdown
- Soft-start function
Block Diagram
Development Tool
Publié le: 2017-11-06
| Mis à jour le: 2022-06-20