MT7223 MAXIC | Alldatasheet

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Technical content

Step-down constant current LED driver Maximizing IC Performance with internal MOS switch Tel: 86-10-62662828 Copyright © 2017 Maxic Technology Corporation Page 1

DESCRIPTION

MT7223 is a high efficiency and high precision step-down constant current LED driver with an integrated 90V MOS switch. MT7223 uses fixed-off-time peak current control scheme, the off-time can be adjusted by changing the external capacitor, and the operation frequency also can be adjusted according to the need of customer. MT7223 regulates the current flowing through LEDs to set the luminance of LEDs by changing the external current sense resistor, on the other hand, the luminance of LEDs also can be regulated by a PWM signal applied to DIM pin. DIM pin can also achieve linear dimming. MT7223 integrates VDD Zener Diode and over temperature protection, etc. to reduce the peripheral components and improve the system reliability. Typical Application Circuit

FEATURES

 Wide input voltage range: 3.1V~90V  Internal 90V MOS switch  Supports PWM dimming and linear dimming  Built-in VIN line compensation  High efficiency (up to 93%)  Up to 1MHz switching frequency  CS voltage: 250mV  UVLO voltage: 2.6V  Intelligent over temperature protection  OFF-time programmable  Internal VDD Zener Diode  Available in ESOP8 packages, the bottom plane is connected to SW pin APPLICATION  Bicycle, electric bicycle, motorcycle light  Strong light flashlight  Spotlighting  High power LED lighting  LED back-up lighting ABSOLUTE MAXIMUM RATINGS