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8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
ABSOLUTE MAXIMUM RATINGS
FAULT, IN to SGND .............................................-0.3V to +30V
FB_, LX to PGND ...................................................-0.3V to +45V
PGND to SGND ....................................................-0.3V to +0.3V
V CC , EN, PWMI, SDA, SCL to SGND ......................-0.3V to +6V
COMP, ISET, OSC, OVP,
PWMO, DFSET to SGND .......................... -0.3V to (V CC + 0.3V)
LX Switch Maximum Continuous RMS Current ....................1.6A
Continuous Power Dissipation (T A = +70 N C)
24-Pin Thin QFN (derate 20.8mW/ N C
above +70 N C) ........................... 1667mW (single-layer board)
24-Pin Thin QFN (derate 27.8mW/ N C
above +70 N C) .............................. 2222mW (multilayer board)
Operating Temperature Range .......................... -40 N C to +85 N C
Junction Temperature .....................................................+150 N C
Storage Temperature Range............................ -65 N C to +150 N C
Lead Temperature (soldering, 10s) ................................+300 N C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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 = 0 N C to +85 N C , unless otherwise noted. Typical values are at T A = +25 N C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY
V CC = open, EN = high
5.5
28
IN Input Voltage Range (Note 1)
EN = SGND, SMBus mode
(Note 5)
All functions available
SMBus interface only
6.3
3.9
4.0
28
V
IN Input Voltage UVLO Threshold
(SMBus Mode Only) (Note 4)
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
6.05
5.9
2.0
0.7
30
5.0
4.6
40
4.3
6.2
6.05
3.0
1.1
60
5.3
4.95
70
4.45
V
mA
mA
F A
V
mA
V
STEP-UP REGULATOR
LX On-Resistance
LX Leakage Current
100mA from LX to PGND
40V on LX, T A = +25 N C
R OSC = 50k I
1.7
0.15
2.0
0.3
1
2.3
I
F A
Operating Frequency
Minimum On-Time
Maximum Duty Cycle
R OSC = 100k I
R OSC = 200k I
(Note 1)
At f SW = 1MHz
0.9
0.4
93
1.0
0.5
50
95
1.1
0.6
97
MHz
ns
%
Minimum Off-Time
50
ns
2
_______________________________________________________________________________________
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