LP3905 is a multi-functional Power Management Unit, optimized for low power handheld applications. This device integrates two 600mA DC/DC buck regulators and two 150mA linear regulators. Fixed and adjustable buck output versions are available. The LP3905 additionally features two enable pins for the device output control and is offered in an LLP package.
The LP3905 is a multi‑functional Power Management Unit optimized for low‑power handheld applications. It integrates two 600 mA buck regulators and two 150 mA linear regulators, with separate enable pins for each buck regulator and shared enable pins for the linear regulators. The device is offered in a 14‑pin leadless‑leadframe package (LLP).
The document provides a complete functional description, electrical characteristics, pin definitions, typical application circuits, board‑layout recommendations, and physical dimensions. It also includes ordering information, package marking details, and safety notices.
| Efficiency (PWM mode) | up to 90 % |
|---|---|
| Adjustable buck output voltage range | 1.0 V to 3.3 V |
| LDO dropout voltage | 80 mV |
The device operates with an input voltage between 3 V and 5.5 V.
It has two enable pins, EN1 and EN2, which control the buck regulators and linear regulators.
The LP3905 is supplied in a 14‑pin LLP (leadless‑leadframe) package measuring roughly 4 mm × 9.257 mm × 0.8 mm.