MAX1570ETE+【PDF 6/11 页】IC LED DRVR WHITE BCKLGT 16-TQFN

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Sheet目录340

2页 3页 4页 5页 [6页]7页 8页 9页 10页

White LED Current Regulator with 1x/1.5x

High-Efficiency Charge Pump

Pin Description

—

NAME

C1P

EN2

GND

LED5

LED4

LED3

LED2

LED1

SET

EN1

PGND

C1N

C2P

OUT

C2N

FUNCTION

Transfer Capacitor 1 Positive Connection

Enable, Dimming Control Input 2. EN2 and EN1 control shutdown, 1/3 current, 2/3 current, and full

current (see Table1).

Analog Ground. Connect directly to the exposed paddle underneath the IC.

LED5 Cathode Connection. Current flowing into LED5 is 230 times the current flowing out of SET.

When using fewer than five LEDs, this pin can be left unconnected. LED5 is high impedance during

shutdown.

LED4 Cathode Connection. Current flowing into LED4 is 230 times the current flowing out of SET.

When using fewer than five LEDs, this pin can be left unconnected. LED4 is high impedance during

shutdown.

LED3 Cathode Connection. Current flowing into LED3 is 230 times the current flowing out of SET.

When using fewer than five LEDs, this pin can be left unconnected. LED3 is high impedance during

shutdown.

LED2 Cathode Connection. Current flowing into LED2 is 230 times the current flowing out of SET.

When using fewer than five LEDs, this pin can be left unconnected. LED2 is high impedance during

shutdown.

LED1 Cathode Connection and Charge-Pump Feedback. Current flowing into LED1 is 230 times the

current flowing out of SET. The charge pump regulates the voltage on LED1 to various voltages

depending upon the status of EN1 and EN2 (see Table 1). Grounding LED1 forces OUT to operate at

5V while LED2–LED5 regulate the LED current to 230 x V SET /R SET . LED1 is high impedance during

shutdown.

Bias Current Set Input. The current flowing out of SET programs the bias current into each LED by

I LED_ = 230 x I SET . V SET is internally biased to various voltages (see Table 1). Connect a resistor to

GND to set the bias current as V SET /R SET . SET is high impedance during shutdown.

Enable, Dimming Control Input 1. EN1 and EN2 control shutdown, 1/3 current, 2/3 current, and full

current (see Table 1).

Power Ground. Charge-pump switching current flows through this pin. Connect to GND and system

ground as close to the MAX1570 and the input bypass capacitor as possible.

Transfer Capacitor 1 Negative Connection

Supply Voltage Input. Bypass IN to PGND with a 1μF ceramic capacitor. The input voltage range is

2.7V to 5.5V. IN is high impedance during shutdown.

Transfer Capacitor 2 Positive Connection

Charge-Pump Output. Bypass to PGND with a 4.7μF ceramic capacitor as close to the IC as possible.

Connect to the anodes of all the LEDs. OUT is high impedance during shutdown.

Transfer Capacitor 2 Negative Connection

Exposed paddle. Connect to GND.

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