LM3502 is a white LED driver for lighting applications. It provides a complete solution for dual display or large single white LED string backlighting applications. The LM3502 includes two internal white LED current bypass FET switches that are ideal for controlling dual display applications. The white LED current can be adjusted with a PWM signal directly from a microcontroller without the need for an RC filter network. With features such as no external compensation, cycle-by-cycle current limit, over-voltage protection, and under-voltage protection, the LM3502 offers superior performance compared to other application specific standard product step-up white LED drivers.
The LM3502 is a white‑LED step‑up converter designed for dual‑display backlighting and other lighting applications. It accepts a wide input voltage range (2.5 V to 5.5 V) and provides selectable output voltages of 16 V, 25 V, 35 V or 44 V, regulated by an internal PWM‑controlled current‑mode architecture.
The device includes integrated protection features such as under‑voltage protection (UVP), over‑voltage protection (OVP), soft‑start, current‑limit and thermal shutdown. It is offered in two package types – a 10‑bump thin‑micro SMD (TLP10) and a 16‑lead thin leadless leadframe (SQA16A) – and is supplied in tape‑and‑reel form.
| Input Voltage Range | 2.5 V to 5.5 V |
|---|---|
| Output Voltage Options | 16 V, 25 V, 35 V, 44 V |
| Switching Frequency | 0.8 MHz to 1.2 MHz |
| Current Limit (16 V version) | 400 mA to 800 mA |
| Under‑Voltage Protection Threshold | 2.4 V to 2.5 V |
| Package Types | 10‑Bump Thin MicroSMD (TLP10) and 16‑Lead Thin Leadless Leadframe (SQA16A) |
The LM3502 operates with an input voltage from 2.5 V to 5.5 V.
It can be set to 16 V, 25 V, 35 V, or 44 V output.
It is offered in a 10‑bump thin‑micro SMD (TLP10) and a 16‑lead thin leadless leadframe (SQA16A) package.