MAX17127 Maxim Integrated Products, MAX17127 Datasheet - Page 10

• Manufacturer Part Number: MAX17127
• Description: Six-String WLED Driver
• Manufacturer: Maxim Integrated Products

Six-String WLED Driver with Integrated
Step-Up Converter
10
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PIN
10
11
12
13
14
15
16
17
18
19
20
—
7
8
9
R_FPWM
NAME
COMP
AGND
PGND
PWM
OVP
FB5
FB4
FB3
FB2
FB1
SW
I.C.
V
EP
IN
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 AGND.
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 AGND.
Analog Ground
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 AGND.
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 AGND.
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 AGND.
Connect R_FPWM to AGND
Overvoltage Sense. Connect OVP to the boost converter output through a resistor:
Boost Regulator Power Ground
Boost Regulator Power Switch Node
Internal Connection. Not connected externally.
Step-Up Converter Compensation Pin. Connect a ceramic capacitor in series with a resistor from
COMP to AGND.
Supply Input. V
AGND directly at the pin with a 0.1FF or greater ceramic capacitor.
PWM Signal Input. This signal is used for brightness control. The brightness is proportional to the
PWM duty cycle, and the PWM signal directly controls the LED turning on/off.
Exposed Backside Pad. Solder to the circuit board ground plane with sufficient copper connection
to ensure low thermal resistance. See the PCB Layout Guidelines section.
IN
biases the internal 5V linear regulator that powers the device. Bypass V
V
OVP
= 1.25V O (1 + R
FUNCTION
Pin Description (continued)
1
/R
2
)
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IN
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