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8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V IN = 12V, C COMP = 33nF, R COMP = 1k I , R ISET = 50k I , R OSC = 100k I , R DFSET = 250k I , PWMI = SGND,
C PWMO = 1μF, T A = -40 N C to +85 N C , unless otherwise noted. Typical values are at T A = +25 N C.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY
V CC = open, EN = high (Note 5)
5.5
28
IN Input Voltage Range (Note 1)
EN = SGND, SMBus
mode
All functions available
SMBus interface only
6.3
3.9
4.0
28
V
IN Input Voltage UVLO
Threshold (SMBus Mode Only)
(Note 2)
IN Quiescent Current
V CC Output Voltage
V CC Current Limit
V CC UVLO Threshold
Rising edge, hysteresis = 150mV
Falling edge, hysteresis = 150mV
MAX17105 is enabled at minimum brightness,
in SMBus mode and no load, V IN = 28V
MAX17105 is enabled in SMBus mode, and is under
IN UVLO, V IN = 5.5V
MAX17105 is disabled
MAX17105 is enabled, 6V < V IN < 28V, 0 < I VCC < 10mA
MAX17105 is disabled, V IN = 12V
V CC is forced to 4.5V
Rising edge, typical hysteresis = 85mV
5.9
5.75
4.7
3.7
15
4.00
6.2
6.05
3.0
1.1
60
5.3
4.95
70
4.45
V
mA
F A
V
mA
V
STEP-UP REGULATOR
LX On-Resistance
100mA from LX to PGND
R OSC = 50k I
1.7
0.3
2.3
I
Operating Frequency
Maximum Duty Cycle
LX Current Limit
R OSC = 100k I
R OSC = 200k I
At f SW = 1MHz
Duty cycle = 75%
0.9
0.45
93
2.4
1.1
0.6
98
3.4
MHz
%
A
CONTROL INPUT
Logic-Input High Level
Logic-Input Low Level
SDA Output-Low Sink Current
SDA, SCL, PWMI, EN
SDA, SCL, PWMI, EN
V SDA = 0.4V
2.1
4
0.8
V
V
mA
SDA, SCL Input Bias Current
T A = +25 N C
-1
+1
F A
LED CURRENT
Full-Scale FB_ Output Current
Adjustable Range (Note 3)
Full-Scale FB_ Output Current
Current Regulation Between
Strings
Minimum FB_ Regulation Voltage
FB_ On-Resistance
FB_ On-Time
PWM only dimming mode
SMBus-enabled dimming modes
R ISET = 33.3k I
R ISET = 50.0k I
R ISET = 66.6k I
V ISET < 0.4V
I FB _ = 30mA
I FB _ = 20mA
I FB _ = 15mA
I FB _ = 30mA
V FB _ = 50mV
15
15
28.8
18.9
14.25
0.2
-2.5
-2.5
-2.5
400
30
25
31.2
21
15.75
0.4
+2.5
+2.5
+2.5
770
26
mA
mA
%
mV
I
ns
________________________________________________________________________________________
5
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