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SC440A Datasheet(PDF) 9 Page - Semtech Corporation |
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SC440A Datasheet(HTML) 9 Page - Semtech Corporation |
9 / 21 page SC440A 9 www.semtech.com © 2010 Semtech Corp. Pin Descriptions Pin # Pin Name Pin Function 1 IO1 Provides constant sink current to LED string 1. 2 AGND Analog ground 3 FFLAG Power failure signal output with open collector. 4 EN Enable the device including requlator and LED drivers. 5 SS Soft-start pin 6 OVPRTN Over-voltage return 7 OVPIN Over-voltage input 8, 12 PGND Power ground 9, 10 SW Collector of the internal power transistor – connect to the boost inductor and the rectifying diode. 11 N/C Left open. 13 VIN Input power supply. 14 IOSET Current source IO value set pin – by selecting the resistor connected from this pin to GND, the corresponding maximum current on all 6 strings are set. 15 SCP_EN LED short-circuit protection pin – leaving this pin open enables the function, tying it to ground disables it. If any IO pin connects to VIN, SCP_EN needs to be left open to activate the protection. 16 COMP The output of the internal transconductance error amplifier – this pin is used for loop compensation. 17 VOUT Output voltage pin – internal over-voltage Connect the output capacitor and the anode of control pin for LED backlight strings. 18 PWM PWM control pin for LED backlight strings. 19 IO6 Provides constant sink current to LED string 6. 20 IO5 Provides constant sink current to LED string 5. 21 IO4 Provides constant sink current to LED string 4. 22 IOGND Constant sink current ground, tying to AGND. 23 IO3 Provides constant sink current to LED string 3. 24 IO2 Provides constant sink current to LED string 2. T Thermal Pad Thermal pad for heatsinking purposes — connect — not connected internally EN STATUS 0 backlight disable 1 backlight enable Note: When EN = 0; the boost is turned OFF and disabled. Table 1. Note: Any unused IO pin should be pulled up to VIN with the SCP_EN left open. |
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