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MAX8740ETB Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX8740ETB Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page TFT-LCD Step-Up DC-DC Converter _______________________________________________________________________________________ 5 PIN NAME FUNCTION 1 COMP Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. See the Loop Compensation section for component selection guidelines. 2FB Feedback Pin. The FB regulation voltage is 1.24V nominal. Connect an external resistive voltage-divider between the step-up regulator’s output (VOUT) and GND, with the center tap connected to FB. Place the divider close to the IC and minimize the trace area to reduce noise coupling. Set VOUT according to the Output Voltage Selection section. 3 SHDN Shutdown Control Input. Drive SHDN low to turn off the MAX8740. 4, 5 GND Ground. Connect pins 4 and 5 directly together. 6, 7 LX Switch Pin. LX is the drain of the internal MOSFET. Connect the inductor/rectifier diode junction to LX and minimize the trace area for lower EMI. Connect pins 6 and 7 directly together. 8IN Supply Pin. Bypass IN with a minimum 1µF ceramic capacitor directly to GND. 9 FREQ Frequency-Select Input. When FREQ is low, the oscillator frequency is set to 640kHz. When FREQ is high, the frequency is 1.2MHz. This input has a 5µA pulldown current. 10 SS Soft-Start Control Pin. Connect a soft-start capacitor (CSS) to this pin. Leave open for no soft-start. The soft- start capacitor is charged with a constant current of 4.5µA. Full current limit is reached after t = 2.5 x 10 5 CSS. The soft-start capacitor is discharged to ground when SHDN is low. When SHDN goes high, the soft-start capacitor is charged to 0.4V, after which soft-start begins. Pin Description LX LX FB GND GND FREQ IN COMP SS 1 4 5 2 3 9 8 67 10 VOUT 13.5V/800mA VIN 4.5V TO 5.5V SHDN MAX8740 C1 10 µF 6.3V R3 10 Ω C3 1 µF C6 33nF C4 560pF C5 68pF L1 2.7 µH D1 R2 20k Ω 1% R4 47k Ω 1% R1 196k Ω 1% C2 10 µF 20V C7 10 µF 20V Figure 1. Typical Operating Circuit |
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Similar Description - MAX8740ETB |
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