MAX17061AEVKIT+ Maxim Integrated Products, MAX17061AEVKIT+ Datasheet - Page 10

• Manufacturer Part Number: MAX17061AEVKIT+
• Description: Power Management Modules & Development Tools MAX17061A EVAL KIT MAX17061A EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX17061AEVKIT+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8-String White LED Driver with
SMBus for LCD Panel Applications
10
4, 6, 18
PIN
10
11
12
13
14
15
16
17
19
20
21
1
2
3
5
7
8
9
______________________________________________________________________________________
PGND2
PGND1
PWMO
NAME
PWMI
FSET
GND
N.C.
OSC
SDA
FB3
FB4
FB5
FB6
FB7
FB8
SCL
LX2
LX1
IN
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 V
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 V
Analog Ground
No Connection
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 V
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 V
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 V
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 V
Oscillator Frequency-Selection Pin. Connect OSC to V
1MHz. Connect OSC to GND to set the frequency to 500kHz. Float OSC to set the frequency to 750kHz.
PWM Signal Input. This PWM signal is used for brightness control in PWM mode or DPST mode. This
signal is filtered and its duty cycle is converted into a digital signal to calculate DPWM duty cycle. In
PWM mode, the DPWM duty cycle equals the input PWM duty cycle. In DPST mode, the DPWM duty cycle
is the input PWM duty cycle multiplied by the SMBus brightness command.
Filtered PWM Signal Output. Connect a capacitor between PWMO and GND. The capacitor forms a
lowpass filter with an internal 40k
level represents the duty-cycle information of the input PWM signal.
DPWM Frequency Adjustment Pin. Connect a resistor from FSET to GND to set the internal DPWM frequency:
where:
This DPWM signal directly chops WLED current with the calculated duty cycle for brightness control.
SMBus Serial-Data Input
SMBus Serial-Clock Input
Boost Regulator Internal MOSFET Drain. Connect the inductor and the Schottky diode to LX2 node. LX2
should always be shorted to LX1 externally.
Boost Regulator Internal MOSFET Drain. Connect the inductor and the Schottky diode to LX1 node. LX1
should always be shorted to LX2 externally.
Boost Regulator Power Ground
Boost Regulator Power Ground
Supply Input, 7.5V to 26V. Bypass IN to GND directly at the pin with a 0.1μF or greater ceramic capacitor.
When IN voltage is below its UVLO threshold, the MAX17061A turns off the output.
= 58509
= 10.638
(typ) resistor to filter the PWM signal into an analog signal whose
f
DPWM
FUNCTION
CC
R
10
[ ]
to set the step-up converter’s oscillator frequency to
9
CC
CC
CC
CC
CC
CC
.
.
.
.
.
.
Pin Description