JAJSNB3 September 2023 LP5813
PRODUCTION DATA
The integrated synchronous boost converter is designed to operate with 0.5 V to 5.5 V input voltage supply with 1.6 A (typ.) valley switch current limit. The LP5813 operates at quasi-constant frequency pulse width modulation (PWM) mode, when driving moderate and heavy load. The switching frequency is 1 MHz when the input voltage is above 1.5 V. The frequency is reduced to 0.5 MHz gradually when the input voltage decreases from 1.5 V to 1 V, and keeps at 0.5 MHz when the input voltage is below 1 V. At light load conditions, the boost converter operates at pulse frequency modulation (PFM) mode. During PWM operation, the converter works at adaptive constant on-time valley current mode to achieve excellent line regulation and load regulation, by which a smaller inductor and ceramic capacitors can be supported. Internal loop compensation simplifies the design complexity, and also minimizes the external components.
When powering up, the default output voltage is 3 V. The output voltage can be configured at ‘Dev_config_0’ register from 3 V to 5.5 V, with 0.1 V step. The integrated boost works as a general boost converter, which can power not only the LEDs driven by the device itself, but also other loads in the system.