MAX17061
8-String White LED Driver with
SMBus for LCD Panel Applications
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, C
CCV
= 0.022µF, R
CCV
= 5.1kΩ, V
ISET
= V
OSC
= V
DD
= V
CC
, R
FSET
= 464kΩ, V
PWMI
= GND,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
BOOST CONVERTER
LX On-Resistance 20mA from LX_ to PGND 0.3 Ω
LX Leakage Current 45V on LX_ 1 µA
V
OSC
= V
CC
0.89 1.10 MHz
V
OSC
= open 675 825 kHzOperating Frequency
V
OSC
= GND 450 560 kHz
OSC High-Level Threshold
V
CC
-
0.4
V
OSC Midlevel Threshold 1.5
V
CC
-
2.0
V
OSC Low-Level Threshold 0.4 V
Maximum Duty Cycle 94 97 %
LX Current Limit Duty cycle = 75% 1.6 A
CONTROL INPUT
S D A, S C L Log i c Inp ut- H i g h Level 2.1 V
SDA, SCL Logic Input-Low Level 0.8 V
PWMI Logic Input-High Level 2.1 V
PWMI Logic Input-Low Level 0.8 V
INPUT LEAKAGE
PWMI Leakage Current -0.3 +0.3 µA
ISET, FSET Leakage Current ISET , FSET to V
CC
+1 µA
OV Leakage Current -0.1 +0.1 µA
SDA, SCL Input Bias Current -1 +1 µA
SDA Output-Low Sink Current V
SDA
= 0.4V 4 mA
OSC Leakage Current -3 +3 µA
LED CURRENT
ISET = V
CC
24.5 25.5
R
ISET =
133kΩ 28.6 31.4
R
ISET
= 200kΩ 19.0 21.0
Full-Scale FB_ Output Current
R
ISET =
266kΩ 14.3 15.7
mA
ISET High-Level Threshold
V
CC
-
0.4
V
ISET Output Voltage 1.166 1.306 V
C ur r ent Reg ul ati on Betw een S tr i ng s Full brightness -1.5 +1.5 %
I
FB_
= 25mA 425 910
I
FB_
= 30mA 575 1100
I
FB_
= 20mA 380 740
Minimum FB_ Regulation Voltage
I
FB_
= 15mA 285 560
mV
Maximum FB_ Ripple I
FB_
= 20mA (C
OUT
= 1µF, V
OSC
= V
CC
) 200 mV
P/P
FB_ On-Resistance V
FB_
= 50mV (includes 10Ω sense resistor) 28.4 Ω
