Rainbow Electronics MAX17061 User Manual
Page 5
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
= 5.1k
Ω, V
ISET
= V
OSC
= V
DD
= V
CC
, R
FSET
= 464k
Ω, 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
kHz
Operating 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 =
133k
Ω
28.6
31.4
R
ISET
= 200k
Ω
19.0
21.0
Full-Scale FB_ Output Current
R
ISET =
266k
Ω
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 10
Ω sense resistor)
28.4
Ω