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Diodes Inc.

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Product Description:
The ZXLD1350 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 7V and 30V and provides an externally adjustable output current of up to 350mA. Depending upon supply voltage and external components, this can provide up to 8 watts of output power. The ZXLD1350 includes the output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Output current can be adjusted above, or below the set value, by applying an external control signal to the 'ADJ' pin. The ADJ pin will accept either a DC voltage or a PWM waveform. Depending upon the control frequency, this will provide either a continuous or a gated output current. The PWM filter components are contained within the chip. The PWM filter provides a soft-start feature by controlling the rise of input/output current. The soft-start time can be increased using an external capacitor from the ADJ pin to ground. Applying a voltage of 0.2V or lower to the ADJ pin turns the output off and switches the device into a low current standby state. The device is assembled in a TSOT23-5 pin package.

Product Specifications:
Simple low parts count
Internal 30V NDMOS switch
350mA output current
Single pin on/off and brightness control using DC voltage or PWM
Internal PWM filter
High efficiency (up to 95%(*))
Wide input voltage range: 7V to 30V
40V transient capability
Output shutdown
Up to 1MHz switching frequency
Inherent open-circuit LED protection
Typical 4% output current accuracy

Product Overview Specs
Part Number ZXLD1350
Min.- Max. Input Voltage (V) 7 ~ 30
Output Voltage (V) 30
Typ Peak Output Current (A) 0.35
Max Output Current (mA) -
LED Current Accuracy (%) 5
Frequency (kHz) typ 1000
Efficiency (%) 95
Operating Temperature (C) -40 to +105
Quiescent Current (mA) typ -
Standby Quiescent Current (uA) typ 15

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