LD5850 PDF Datasheet – Boost Controller

Part Number: LD5850, LD5850GS

Function: Boost Controller for LED Backlight

Package: SOP-8 Pin Type

Manufacturer: Leadtrend Technology

Images:LD5850 pdf controller


An asynchronous current-mode boost controller is a type of power supply controller used in boost converters. It operates in an asynchronous mode, meaning that it does not rely on a fixed switching frequency like synchronous converters. Instead, the switching of the power switch is triggered by the current level in the inductor, making it responsive to load variations.

The LD5850 is a wide-input asynchronous current mode boost controller, capable to operate in the range between 9V and 28V and to generate 14V of voltage to the GATE pin of MOSFET to reduce thermal loss. The current mode control architecture enhances transient response and simplifies the loop compensation. The DIM input allows the brightness control for LED Backlight or LED lighting. The Device also features internal slope compensation, input voltage under-voltage lockout, output voltage short circuit protection, cycle-by-cycle current limit and thermal shutdown protection.


1. Wide Input Range: 9V to 28V

2. Current Mode Control

3. 0.3V LED Feedback Current Sensing Reference

4. Fixed Switching Frequency

5. PWM Dimming Input

6. Internal Slope Compensation

7. Cycle-by-Cycle Current Limit

8. Over Temperature Protection


LD5850 datasheet pinout

Overall, asynchronous current-mode boost controllers are widely used in various applications where a simple and efficient boost converter is required. They are commonly found in battery-powered devices, LED drivers, and other applications that need a higher output voltage than the available input voltage


1. LED TV Backlight

2. LED Monitor Backlight

3. LED lighting


LD5850 PDF Datasheet