Product Introduction

Product parameters

Funtion:Switch-Mode High-Brightness LED Driver IC

Opration Mode:Switch

Vin Range:3.2V-30V

Operating Current:350uA

Chip Temperature Regulation:Yes


Max Output Power:35W

Switching Frequency:<1MHz


Chip Enable:Yes

On-chip Power MOSFET:No

General Description

The CN5821 is a switch-mode step-down constant-current high-brightness LED (HB LED) driver IC, the device provides a cost-effective solution for automotive interior/exterior lighting, architectural and ambient lighting, LED bulbs such as MR16 and other LED illumination applications.

The CN5821 operates from a 3.2V to 30V input voltage and features a 5V/15mA on-board regulator. A high-side current-sense resistor sets the LED current with 10% accuracy and a dedicated input (DIM pin) enables PWM dimming and analog dimming. Furthermore if the voltage at DIM pin is less than 0.15V for more than 8ms, CN5821 will enter shutdown mode, and consumes 0uA(Typical) current from input supply.

A hysteretic control algorithm ensures excellent input-supply rejection and fast response during load transients and PWM dimming. The CN5821 features a 15% inductor current ripple. The device operates up to 1MHz switching frequency, thus allowing for small component size.

The CN5821 is available in 6-pin SOT23 package.



l  Architectural, Industrial, and Ambient Lighting

l  Automotive RCL, DRL, and Fog Lights

l  MR16 and Other LED Bulbs

l  Indicators and Emergency Lighting



l  Operating Voltage Range: 3.2V to 30V

l  High Side Current Sense

l  PWM Dimming and Analog Dimming

l  PWM Dimming Frequency: 200Hz to 20kHz

l  Automatic Shutdown

l  Hysteretic Control: No Compensation

l  Switching Frequency: Up to 1MHz

l  Constant Current with ±10% accuracy

l  Up to 35W Output Power

l  On-chip 5V15mA Voltage Regulator (LDO)

l  Over Junction-Temperature Protection

l  Operating Temperature Range:40 to 85

l  Available In 6 pin SOT23 Package

l  Lead Free, rohs-Compliant and Halogen Free


Tools and Documents




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