IS31FL3208 18-CHANNEL LED DRIVER SELECTABLE PWM FREQUENCY Preliminary Information March 2018 GENERAL DESCRIPTION FEATURES IS31FL3208 is comprised of 18 constant current 2.7V to 5.5V supply channels each with independent PWM control, I2C interface, automatic address increment designed for driving LEDs, PWM frequency can be function 23kHz (default) or 3.45kHz. The output current of each Four selectable I2C addresses channel can be set at up to 38mA (Max.) by an external Internal reset register resistor and independently scaled by a factor of 1, Modulate LED brightness with 256 steps PWM 11/12, 9/12 and 7/12. The average LED current of each Each channel can be controlled independently channel can be changed in 256 steps by changing the PWM duty cycle through an I2C interface. Each channel can be scaled independently by 1, 11/12, 9/12 and 7/12 The chip can be turned off by pulling the SDB pin low or PWM frequency selectable by using the software shutdown feature to reduce - 23kHz (default) power consumption. - 3.45kHz IS31FL3208 is available in QFN-28 (4mm 4mm) -40C to +125C temperature range package. It operates from 2.7V to 5.5V over the QFN-28 (4mm 4mm) package temperature range of -40C to +125C. APPLICATIONS Mobile phones and other hand-held devices for LED display LED in home appliances TYPICAL APPLICATION CIRCUIT VBattery VBattery 3 VCC 8 OUT1 1 F0.1 F 9 OUT2 10 V OUT3 DD 4.7k 4.7k 6 SDA 7 Micro SCL Controller 1 IS31FL3208 SDB 0.1 F 100k 26 OUT16 *Not e 2 5 27 R EXT OUT17 28 3.3k OUT18 2 AD 4,11 18,25 GND GND Figure 1 Typical Application Circuit Note 1: The maximum output current is set to 38mA when R = 2k. Please refer Page 10 for setting LED current. EXT Note 2: A 0.1F capacitor is necessary for passing the EFT test. Integrated Silicon Solution, Inc. www.issi.com 1 Rev. 0B, 02/08/2018 IS31FL3208 PIN CONFIGURATION Package Pin Configuration (Top View) QFN-28 PIN DESCRIPTION No. Pin Description 1 SDB Shutdown the chip when pulled low. 2 AD I2C address setting. 3 VCC Power supply. 4,11, GND Ground. 18,25 Input terminal used to connect an external resistor. This 5 R EXT regulates the global output current. 6 SDA I2C serial data. 7 SCL I2C serial clock. 8~10 OUT1~OUT3 Output channel 1~3 for LEDs. 12~17 OUT4 ~ OUT9 Output channel 4~9 for LEDs. 19~24 OUT10 ~ OUT15 Output channel 10~15 for LEDs. 26~28 OUT16 ~ OUT18 Output channel 16~18 for LEDs. Thermal Pad Connect to GND. Integrated Silicon Solution, Inc. www.issi.com 2 Rev. 0B, 02/08/2018 OUT1 8 28 OUT18 OUT2 9 27 OUT17 OUT3 10 26 OUT16 GND 11 25 GND OUT4 12 24 OUT15 OUT5 13 23 OUT14 OUT6 14 22 OUT13