MAX17061ETI+ Maxim Integrated Products, MAX17061ETI+ Datasheet - Page 10

• Manufacturer Part Number: MAX17061ETI+
• Description: IC LED DRVR WHITE BCKLGT 28-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Backlight, White LEDr

Specifications of MAX17061ETI+

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 8
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: White LED
• Frequency: 1MHz
• Voltage - Supply: 4.5 V ~ 26 V
• Voltage - Output: 5V
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Operating Supply Voltage: 5 V
• Maximum Supply Current: 2 mA
• Maximum Power Dissipation: 1667 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• 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
OSC
N.C.
SDA
SCL
FB3
FB4
FB5
FB6
FB7
FB8
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
O sci l l ator Fr eq uency- S el ecti on P i n. C onnect OS C to V
1M H z. C onnect O S C to G N D to set the fr eq uency to 500kH z. Fl oat OS C to set the fr eq uency to 750kH z.
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 (typ) resistor to filter the PWM signal into an analog signal whose level represents
the duty-cycle information of the input PWM signal.
D P W M Fr eq uency Ad j ustm ent P i n. C onnect a r esi stor fr om FS E T to GN D to set the i nter nal D P WM fr eq uency:
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, 4.5V to 26V. V
GND directly at the pin with a 0.1µF or greater ceramic capacitor.
= 58509
= 10.638
IN
biases the internal 5V linear regulator that powers the device. Bypass IN to
f
DPWM
FUNCTION
C C
R
10
[ ]
to set the step - up conver ter ’ s osci l l ator fr eq uency to
9
CC
CC
CC
CC
CC
CC
.
.
.
.
.
.
Pin Description