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8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
NAME
COMP
ISET
PWMO
OSC
OVP
V CC
IN
FAULT
SGND
FB1
FB2
FB3
FB4
FB5
FB6
FB7
FB8
FUNCTION
Step-Up Regulator Compensation Pin. Connect a 0.033 F F ceramic capacitor and 1k I resistor from
COMP to SGND and an additional 220pF capacitor from COMP to SGND. When the MAX17105
shuts down, COMP is discharged to 0V through an internal 20k I resistor.
Full-Scale LED Current Adjustment Pin. The resistance from ISET to SGND controls the full-scale
current in each LED string:
I LED_MAX = 20mA O 50k I /R ISET
The acceptable resistance range is 33.3k I < R ISET < open, which corresponds to full-scale LED
current of 30mA > I LED_MAX > 0mA. Connecting ISET to SGND sets the test mode for 0.3mA (typ)
full-scale LED current.
Filtered PWM Signal Output. Connect a capacitor between PWMO and SGND. The capacitor forms
a lowpass filter with an internal 40k I (typ) resistor to filter the PWM signal into an analog signal
whose level represents the duty cycle information of the input PWM signal.
Oscillator Frequency Adjustment Pin. The resistance from OSC to SGND sets the step-up
regulator’s oscillator frequency:
f SW = 1MHz O 100k I /R OSC
The acceptable resistance range is 50k I < R OSC < 200k I , which corresponds to the switching
frequency of 2MHz > f S W > 500kHz .
Overvoltage Sense. Connect OVP to the center tap of a resistive voltage-divider from the output of
the step-up regulator to ground.
5V Linear-Regulator Output. V CC provides power to the MAX17105. Bypass V CC to SGND with a
ceramic capacitor of 1 F F or greater.
Power-Supply Input. V IN biases the internal 5V linear regulator that powers the device. Bypass IN
to SGND directly at the pin with a 0.1 F F ceramic capacitor or greater.
External p-Channel MOSFET Gate Drive-Output. External pullup resistor is connected between
FAULT and IN when p-channel MOSFET is used. If the p-channel MOSFET is not used, leave
FAULT unconnected.
Analog Ground
LED String 1 Cathode Connection. FB1 is the open-drain output of an internal regulator, which
controls current through FB1. FB1 can sink up to 30mA. If unused, connect FB1 to SGND.
LED String 2 Cathode Connection. FB2 is the open-drain output of an internal regulator, which
controls current through FB2. FB2 can sink up to 30mA. If unused, connect FB2 to SGND.
LED String 3 Cathode Connection. FB3 is the open-drain output of an internal regulator, which
controls current through FB3. FB3 can sink up to 30mA. If unused, connect FB3 to SGND.
LED String 4 Cathode Connection. FB4 is the open-drain output of an internal regulator, which
controls current through FB4. FB4 can sink up to 30mA. If unused, connect FB4 to SGND.
LED String 5 Cathode Connection. FB5 is the open-drain output of an internal regulator, which
controls current through FB5. FB5 can sink up to 30mA. If unused, connect FB5 to SGND.
LED String 6 Cathode Connection. FB6 is the open-drain output of an internal regulator, which
controls current through FB6. FB6 can sink up to 30mA. If unused, connect FB6 to SGND.
LED String 7 Cathode Connection. FB7 is the open-drain output of an internal regulator, which
controls current through FB7. FB7 can sink up to 30mA. If unused, connect FB7 to SGND.
LED String 8 Cathode Connection. FB8 is the open-drain output of an internal regulator, which
controls current through FB8. FB8 can sink up to 30mA. If unused, connect FB8 to SGND.
_______________________________________________________________________________________
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