8-String White LED Driver with
SMBus for LCD Panel Applications
ABSOLUTE MAXIMUM RATINGS
IN to GND ..............................................................-0.3V to +28V
FB_, LX_ to GND ....................................................-0.3V to +45V
PGND_ to GND......................................................-0.3V to +0.3V
V CC , V DD , PWMI, SDA, SCL to GND ........................-0.3V to +6V
ISET, CCV, PWMO, FSET, OSC,
OV to GND ................................................-0.3V to V CC + 0.3V
Continuous Power Dissipation (T A = +70°C)
28-Pin Thin QFN (derate 16.9mW/°C above +70°C)...1667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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 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 = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
IN Input Voltage Range
V IN = V CC
V CC = open
CONDITIONS
MIN
4.5
5.5
TYP
MAX
5.5
26.0
UNITS
V
IN Quiescent Current
MAX17061 is enabled at
minimum brightness, no load
V IN = 26V
V IN = V CC = 5V
1.24
2
mA
IN Quiescent Current
MAX17061 is disabled, V IN = 12V
10
μA
V CC Output Voltage
V CC Current Limit
V CC UVLO Threshold
MAX17061 is enabled, 6V < V IN < 26V, 0 < I VCC < 10mA
MAX17061 is disabled, V IN = 12V
V CC is forced to 4.5V
Rising edge, typical hysteresis = 85mV
4.7
3.90
15
4.00
5.0
4.35
40
4.25
5.3
4.80
70
4.45
V
mA
V
BOOST CONVERTER
LX On-Resistance
LX Leakage Current
20mA from LX_ to PGND
45V on LX_
0.15
0.3
1
Ω
μA
V OSC = V CC
0.9
1.0
1.1
MHz
Operating Frequency
V OSC = open
V OSC = GND
675
450
750
500
825
550
kHz
OSC High-Level Threshold
V CC -
0.4
V
OSC Midlevel Threshold
OSC Low-Level Threshold
Minimum Duty Cycle
PWM mode (Note 1)
Pulse skipping, no load (Note 1)
1.5
10
0
V CC -
2.0
0.4
V
V
%
Maximum Duty Cycle
LX Current Limit
Duty cycle = 75% (Note 1)
94.0
1.6
95.5
97.0
%
A
CONTROL INPUT
SDA, SCL Logic Input-High Level
SDA, SCL Logic Input-Low Level
PWMI Logic Input-High Level
PWMI Logic Input-Low Level
2.1
2.1
0.8
0.8
V
V
V
V
2
_______________________________________________________________________________________
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