7V 1.5A 1.25MHz Step-up 10 White LED Driver ZCC3302 替代MP3302

GENERAL DESCRIPTION

The ZCC3302 is a 7.5V step-up DC/DC converter designed for driving up to single 10-series or 9x3-series WLEDs from a single cell Lithium Ion- battery.   The ZCC3302 uses current mode, fixed frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its low 300mV feedback voltage reduces power loss and improves efficiency. The ZCC3302 supports hig-h frequency PWM Dimming through EN pin. The ZCC3302 is turned off if an open-circuit condition is presented. Please be noted that open-circuit condition is not the same as over-voltage condition.. Please refer to the OPERATION DESCRIPTION and

APPLICATION INFORMATION sections for more detail. The ZCC3302 includes soft-start, under-voltage locko-ut, current limiting and thermal overload protections. The ZCC3302 is available in SOT23-6 package.

FEATURES

■  Operating Voltage: 2.5-7.5V

■  Maximum  Output  Voltage:  35V,   capable  of driving 10-series White LED strings

■  Maximum  drive  Capability:  9x3- series  or 6x6-series.

■  Up to 90% Efficiency

■  1.25MHz Fixed Switching Frequency

■  Low 300mV Feedback Voltage

■  Support PWM Dimming

 ■ Open-circuit Protection

 ■ UVLO, Soft-Start and Thermal Shutdown

 ■ Internal 1.5A Current Limit

 ■ SOT23-6 Package

APPLICATIONS

 ■ 5~7” LCD Panels

 ■ Handheld Computers and PDAs

 ■ Digital Cameras

 ■ Small LCD Displays

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