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Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
ABSOLUTE MAXIMUM RATINGS
IN, SHDN , to GND .................................................-0.3V to +28V
FB_ to GND ............................................................-0.3V to +28V
V CC , BRT, ENA, OSC, OV to GND ...........................-0.3V to +6V
ISET, CCV, CS, FSET, CPLL, EXT to GND .-0.3V to (V CC + 0.3V)
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
Continuous Power Dissipation (T A = +70°C)
20-Pin Thin QFN (derate 16.9mW/°C above +70°C) ...1349mW
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, V SHDN = V IN , CCV = 0.1μF, T A = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
IN Input Voltage Range
CONDITIONS
V IN = V CC
V CC = bypassed to GND through 1μF capacitor
MIN
4.5
5.5
TYP
MAX
5.5
26.0
UNITS
V
IN Quiescent Current
V SHDN = high,
BRT = GND
V IN = 26V
V IN = V CC = 5V
1
1
2
2
mA
SHDN = GND
10
μA
V CC Output voltage
V CC Short-Circuit Current
V CC UVLO Threshold
V SHDN = 5V, 6V < V IN < 26V, 0 < I VCC < 10mA
Rising edge, hysteresis = 20mV
4.7
15
4.00
5.0
56
4.25
5.3
130
4.45
V
mA
V
STEP-UP CONVERTER
EXT High Level
10mA from EXT to GND
V CC -
0.1
V CC
V
EXT Low Level
EXT On-Resistance
EXT Sink/Source Current
OSC High-Level Threshold
OSC Midlevel Threshold
OSC Low-Level Threshold
-10mA from EXT to V CC
EXT high or low
EXT forced to 2V
V CC -
0.4
1.5
0
2
1
0.1
5
V CC -
2.0
0.4
V
Ω
A
V
V
V
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
Minimum Duty Cycle
Maximum Duty Cycle
PWM mode
Pulse skipping, no load
94
10
0
95
%
%
CS Trip Voltage
Duty cycle = 75%
85
100
115
mV
CONTROL INPUT
SHDN Logic-Input High Level
SHDN Logic-Input Low Level
BRT, ENA Logic-Input High Level
BRT, ENA Logic-Input Low Level
2.1
2.1
0.8
0.8
V
V
V
V
2
_______________________________________________________________________________________
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