MAX17127 Maxim Integrated Products, MAX17127 Datasheet - Page 9

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

PIN
1
2
3
4
5
6
NAME
FSLCT
V
_______________________________________________________________________________________
ISET
FPO
FB6
DDIO
EN
Six-String WLED Driver with Integrated
5V Linear Regulator Output. V
a ceramic capacitor of 1FF or greater.
Enable Pin. EN = high enables the MAX17127. An internal 200kI (typ) pulldown resistor keeps the
MAX17127 in disabled mode if the EN pin is high impedance.
Oscillator Frequency-Adjustment Pin. The resistance from FSLCT to AGND sets the step-up
converter’s oscillator frequency:
The acceptable resistance range is 100kI < R
frequency of 1MHz > f
Full-Scale LED Current-Adjustment Pin. The resistance from ISET to AGND controls the full-scale
current in each LED string:
The acceptable resistance range is 120kI < R
current of 30mA > I
full-scale LED current.
Fault-Diagnostic Output. Open drain, active low. The FPO output is asserted low when the following
faults occur: overcurrent fault, thermal fault, output-voltage short condition, or output overvoltage.
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 AGND.
TOP VIEW
COMP
PWM
SW
I.C.
V
IN
16
17
18
19
20
LEDMAX
SW
15
1
+
> 250kHz.
(4mm × 4mm)
> 10mA. Connecting ISET to AGND sets the test mode for 0.3mA (typ)
14
2
THIN QFN
DDIO
MAX17127
I
13
LEDMAX
3
f
provides power to the MAX17127. Bypass V
SW
12
4
= 1MHz O 100kI/R
EP
= 20mA O 180kI/R
11
5
FUNCTION
FSLCT
ISET
Step-Up Converter
10 FB3
9
8
7
6
< 360kI, which corresponds to a full-scale LED
< 400kI, which corresponds to the switching
AGND
FB4
FB5
FB6
FSLCT
ISET
Pin Configuration
Pin Description
DDIO
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to AGND with
9