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MAX1574 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1574 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 9 page 180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN _______________________________________________________________________________________ 5 Typical Operating Characteristics (continued) (Circuit of Figure 2, VIN = 3.6V, EN = IN, driving three white LEDs, TA = +25°C, unless otherwise noted.) DIMMING RESPONSE MAX1574 toc10 IOUT VEN VOUT 50mA/div 2V/div 2V/div 10ms/div LINE TRANSIENT 3.8V TO 3.3V TO 3.8V MAX1574 toc11 VOUT VIN IOUT 1V/div 1V/div 60mA, 20mA/div 100µs/div Pin Description PIN NAME FUNCTION 1IN Supply Voltage Input. Connect a 0.47µF to 1µF ceramic capacitor from IN to GND. The input voltage range is 2.7V to 5.5V. IN is high impedance during shutdown. 2EN Enable and Dimming Control. Pulsing EN low dims the LEDs in multiple steps. Drive low for longer than 2ms (typ) to shut down the IC. From shutdown, drive EN high (50µs min) to set ILED to the maximum current (see the SETfunction). Pulse EN low for 0.5µs to 500µs to dim the LEDs (Figure 1). 3CPTransfer-Capacitor Positive Connection. Connect a 0.22µF capacitor from CP to CN. 4CNTransfer-Capacitor Negative Connection. Connect a 0.22µF capacitor from CP to CN. 5 SET Current-Set Input. Connect a resistor (RSET) from SET to GND to set the maximum LED current. ILED(MAX) = 393 × 0.6V / RSET. SET is internally biased to 0.6V. SET is high impedance during shutdown. 6 LED3 7 LED2 8 LED1 LED_ Cathode Connection. Current flowing into LED_ is based on SET description above. In 2x mode, the charge pump regulates the lowest LED_ voltage to 0.18V. Connect LED_ to IN for unpopulated LEDs. LED_ is high impedance during shutdown. 9 GND Ground. Connect GND to system ground and as close as possible to the input-bypass capacitor ground. 10 OUT Output. Connect a 0.47µF to 1µF ceramic capacitor from OUT to GND, and connect OUT to the anodes of all the LEDs. OUT is pulled to ground through an internal 5k Ω resistor in shutdown. —EP Exposed Paddle. Connect the exposed paddle directly to GND underneath the IC. |
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