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MAX1579 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1579 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 13 page Complete Bias and White LED Power Supplies for Small TFT Displays _______________________________________________________________________________________ 7 PIN NAME FUNCTION 11 ONBIAS Logic Input to Enable VDD, MAIN, POS, and NEG Charge Pumps. Drive ONBIAS high to enable all the charge pumps. Connect to GND to disable the charge pumps. 12 GND Ground. Connect to PGND and the exposed pad directly under the IC. 13 COMP LED Driver Compensation. Connect a 0.1µF from COMP to GND. CCOMP stabilizes the driver and sets the soft-start time. 14 CS Current-Sense Feedback Input. Connect a resistor from CS to GND to set the LED current. For the MAX1578, CS regulates to VCTRL / 5 or 0.327V, whichever is lower. For the MAX1579, CS regulates to VCTRL / 5 or 0.340V, whichever is lower. 15 CTRL LED Brightness Control Input. Connect CTRL to a 0.24V to 1.65V input to set the brightness of the external LEDs. Hold CTRL below 100mV for more than 10.5ms, to shut down the LED driver. Drive CTRL with a 200Hz to 200kHz unfiltered PWM dimming signal for DC LED current that is proportional to the signal’s duty cycle. 16 OUT Overvoltage Sense Input. The MAX1578/MAX1579 turn off the n-channel MOSFET when VOUT exceeds 34V. Once VOUT drops below 32V, the IC re-enters soft-start. Bypass OUT to GND with a 0.1µF capacitor. 17 LX Inductor Connection. Connect to the switched side of the external inductor as well as the anode of the external diode. LX is high impedance during shutdown. 18 PGND Power Ground. Connect to GND and the exposed pad directly under the IC. 19 C1N Main Charge-Pump Transfer Capacitor Negative Connection 1. Connect a 2.2µF capacitor between C1N and C1P. 20 C2N Main Charge-Pump Transfer Capacitor Negative Connection 2. Connect a 2.2µF capacitor between C2N and C2P. 21 IN Power-Supply Input. Connect to a 2.7V to 5.5V input supply. Bypass IN to GND with a 4.7µF capacitor. 22 C2P Main Charge-Pump Transfer Capacitor Positive Connection 2. Connect a 2.2µF capacitor between C2P and C2N. 23 C1P Main Charge-Pump Transfer Capacitor Positive Connection 1. Connect a 2.2µF capacitor between C1P and C1N. 24 VDD Regulated Main Charge-Pump Output. VDD is regulated to 5.5V. Bypass VDD to GND with a 4.7µF capacitor. VDD is connected to IN when ONBIAS is pulled low. — EP Exposed Paddle. Connect directly to a ground plane, GND, and PGND directly under the IC. Pin Description (continued) |
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Similar Description - MAX1579 |
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