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LM2754SQX Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM2754SQX Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 11 page Connection Diagram LM2754 24-pin No-Pullback Leadless Leadframe Package (LLP-24) 4mm x 4mm x 0.8mm NS Package Number SQA24A 20202802 Pin Descriptions Pin Name Description 23,24 V INSW Input Voltage Connection for Switch Array. Pins 23 and 24 are connected internally on the die. Connect V IN and VINSW pins together. 22 V IN Input Voltage Connection. Connect V IN and VINSW pins together. 8V OUT Output Voltage. Connect to LED Anodes. 12, 13, 14, 15 D1, D2, D3, D4* Regulated Current Sink Inputs. (* See SEL PIN description) 1, 2, 7, 5 C 1+, C1-, C2+, C2- Flying Capacitor Connections. 3 GND SW Switch Array Ground Connection. Connect GND and GND SW pins together. 9, 16, 17 GND Ground Connection. Connect GND and GND SW pins together. 21 EN Enable Control Pin. Logic High = Normal Operation in Torch Mode. Logic Low = Device Shut-Down. (See Note) 20 T/F Torch/Flash Control Pin. Logic High = Flash Mode. Logic Low = Torch Mode. Device must be enabled for Torch or Flash to operate. (See Note) 10, 11 I SET1,ISET2 Current Set Resistor Connections. Connect 1% resistors to ground to set the desired current through the LEDs. LED current is approximated by the equation: 800 x (1.25V ÷ R). This equation corresponds to the current through one current sink. Total LED current is equal to the sum of currents through all current sinks connected to the LED. The equation used for Torch (I SET1) and Flash (I SET2) resistors are the same. 19 TX RF PA synchronization control pin. Logic High = Force Torch Mode. Logic Low = Normal Operation. (See Applications Information section for the full operational description) (See Note) 18 SEL D 4 Control Pin. Logic Low = Normal 4-LED Operation. Logic High = Disable D 4 LED Input. Connect D4 to VOUT when not used. (See Note) 4, 6 No Connect Do not connect to any node. Note: EN, T/F, TX, and SEL pins each have a 500k Ω resistor connected internally to GND Ordering Information Order Number Package Description Package Marking Supplied as Tape and Reel (Units) LM2754SQ No-Pullback LLP-24 UZXYTT LM2754 1000 LM2754SQX 4500 www.national.com 2 |
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