L4973 Overview
Description
The L4973 is a step down monolithic power switching regulator delivering 3.5 A at fixed voltages of 3.3 V or 5.1 V and using a simple external divider output adjustable voltage up to 50 V. Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical RDS(on) of 0.15 Ω) to obtain very high efficiency and very fast switching times.
Key Features
- Up to 3.5 A step down converter
- Operating input voltage from 8 V to 55 V
- 3.3 V and 5.1 V (±1 %) fixed output, and adjustable outputs from: – 0.5 V to 50 V (3.3 type) – 5.1 V to 50 V (5.1 type)
- Frequency adjustable up to 300 kHz
- Voltage feed forward
- Zero load current operation (min. 1 mA)
- Internal current limiting (pulse by pulse and HICCUP mode)
- Precise 5.1 V (1.5%) reference voltage externally available
- Input/output synchronization function
- Inhibit for zero current consumption (100 mA typ. at VCC = 24 V)
