MT7203

MT7203 is a BUCK, constant current LED driver, operates under Continuous Conduction Mode (CCM). The chip can drive single or multiple series connected LEDs efficiently when the input voltage is higher than the LED voltage. The chip supports 6V~40V input voltage and achieves up to 800mA externally adjustable output current.

MT7203 integrates power switch and a high-end output current sense circuit. The average output current can be set through external resistor.

The ADJ pin can receive the analog dimming signal and PWM dimming signal. If the voltage of the ADJ pin is below 0.2V, the internal power switch will be shut down and then the system enters the standby state with ultra-low power dissipation.

MT7203 is designed with PWM filter circuit, which can realize soft-start function by controlling the rising edge of the current. Besides, the soft-start time can be extended by adding an external capacitor between ADJ pin and GND.

• Simple external circuit with few components

• Constant output current: up to 800mA

• Single pin for ON/OFF, analog/PWM dimming

• Internal PWM filter

• Frequency jittering technique to reduce EMI

• Wide input voltage range: 6V~40V

• Output shutdown

• Switching frequency: Up to 1MHz

• Inherent open-circuit protection

• High accuracy output current: ±5%

• Available in SOT23-5 package