L5989D is a 4 A continuous (more than 5 A pulsed) step-down switching regulator with synchronous rectification
The L5989D is a monolithic step-down power switching regulator capable of delivering a continuous output current of 4 A (more than 5 A pulsed) to the load. It operates with an input voltage range from 2.9 V to 18 V and features an external 1.8 V reference voltage. The device utilizes embedded high-side and low-side PMOS switches with low on-resistance, eliminating the need for an external bootstrap capacitor.
| Output current (continuous) | 4 A |
|---|---|
| Operating input voltage | 2.9 V to 18 V |
| Reference voltage | 1.8 V |
| Output voltage range | 0.6 V to input voltage |
| Switching frequency (max) | 1 MHz |
| Package type | HTSSOP16 |
| Thermal resistance (junction to ambient) | 40 °C/W |
The internal switching frequency is adjustable and can be set continuously from 100 kHz to 1 MHz.
No, the device does not need an external bootstrap capacitor because it uses an embedded high-side PMOS switch.
The typical on-resistance for the high-side MOSFET is 85 mΩ at an output current of 1.0 A.