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, 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
V
IN
= V
CC
V
CC
= bypassed to GND through 1µF capacitor
V
SHDN
= high
SHDN
= GND
V
CC
Output Voltage
V
CC
Short-Circuit Current
V
CC
UVLO Threshold
STEP-UP CONVERTER
EXT High Level
EXT Low Level
EXT On-Resistance
EXT Sink/Source Current
OSC High-Level Threshold
OSC Midlevel Threshold
OSC Low-Level Threshold
V
OSC
= V
CC
Operating Frequency
V
OSC
= open
V
OSC
= GND
Minimum Duty Cycle
Maximum Duty Cycle
CS Trip Voltage
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
0.8
2.1
0.8
V
V
V
V
Duty cycle = 75%
PWM mode
Pulse skipping, no load
94
85
0.9
675
450
1.0
750
500
10
0
95
100
115
10mA from EXT to GND
-10mA from EXT to V
CC
EXT high or low
EXT forced to 2V
V
CC
-
0.4
1.5
V
CC
-
2.0
0.4
1.1
825
550
V
CC
-
0.1
V
CC
0
2
1
0.1
5
V
V
Ω
A
V
V
V
MHz
kHz
%
%
mV
Rising edge, hysteresis = 20mV
V
SHDN
= 5V, 6V < V
IN
< 26V, 0 < I
VCC
< 10mA
4.7
15
4.00
5.0
56
4.25
V
IN
= 26V
V
IN
= V
CC
= 5V
CONDITIONS
MIN
4.5
5.5
1
1
TYP
MAX
5.5
26.0
2
2
10
5.3
130
4.45
UNITS
V
mA
µA
V
mA
V
IN Quiescent Current
www.maximintegrated.com
Maxim Integrated
│
2
MAX8790
Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
Electrical Characteristics (continued)
(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
INPUT LEAKAGE
SHDN
Leakage Current
CS Leakage Current
OSC Leakage Current
BRT, ENA Leakage Current
FSET, ISET Leakage Current
OV Leakage Current
LED CURRENT
ISET = V
CC
, BRT = 100%
Full-Scale FB_ Output Current
R
ISET
= 80kΩ to GND, BRT = 100%
R
ISET
= 133kΩ to GND, BRT = 100%
ISET High-Level Threshold
ISET Voltage
20% Output Current
Current Regulation Between
Strings
Minimum FB_ Regulation Voltage
Maximum FB_ Ripple
FB_ On-Resistance
FB_ Leakage Current
BRT Input Frequency
Minimum BRT Duty Cycle
FAULT PROTECTION
OV Threshold Voltage
FB_ Overvoltage Threshold
FAULT Shutdown Timer
Thermal-Shutdown Threshold
PHASE-LOCKED LOOP
FSET High-Level Threshold
BRT Frequency Capture Range
PLL disabled
R
FSET
= 500kΩ
R
FSET
= 250kΩ
V
CC
-
0.4
150
300
200
400
250
500
V
Hz
V
FB_
> 5.6V (typ)
(Note 1)
1.16
V
CC
+
0.20
50
1.23
V
CC
+
0.6
65
170
1.30
V
CC
+
1.45
80
V
V
ms
°C
PLL active
ISET = V
CC
, BRT = 20%
ISET = V
CC
, BRT = 100%
ISET = V
CC
, BRT = 20%
R
ISET
= 80kΩ to GND, BRT = 100%
ISET = V
CC
, BRT = 100%
ISET = V
CC
, 12.5%
ISET = V
CC
, COUT = 1µF, OSC = V
CC
(Note 1)
V
FB_
= 50mV
SHDN
= GND, VFB_ = 26V
V
SHDN
= V
IN
, BRT = GND, V
FB_
= 15V
100
12.5
10
Default setting for 20mA full-scale LED current
19.40
24.25
14.40
V
CC
-
0.4
1.12
3.84
-1.5
-2.0
300
270
150
500
450
275
120
13
1.19
4.00
1.26
4.16
+1.5
+2.0
800
720
500
200
20
1
28
500
Hz
%
mV
P-P
Ω
µA
mV
20.00
25.00
15.00
20.60
25.75
15.60
V
V
mA
%
%
mA
FSET = ISET = V
CC
V
SHDN
= 26V
V
CS
= GND
-3
-1
-1
-0.1
+40
+35
+50
+3
+1
+1
+0.1
µA
µA
µA
µA
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
3
MAX8790
Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
Electrical Characteristics
(Circuit of Figure 1. V
IN
= 12V, V
SHDN
= V
IN
, CCV = 0.1μF,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
IN Input Voltage Range
V
IN
= V
CC
V
CC
bypassed to GND through 1µF cap
V
SHDN
= high
SHDN
= GND
V
CC
Output Voltage
V
CC
Short-Circuit Current
V
CC
UVLO Threshold
STEP-UP CONVERTER
EXT High Level
EXT Low Level
EXT On-Resistance
OSC High-Level Threshold
OSC Midlevel Threshold
OSC Low-Level Threshold
V
OSC
= V
CC
Operating Frequency
Maximum Duty Cycle
CS Trip Voltage
CONTROL INPUT
SHDN
Logic-Input High Level
SHDN
Logic-Input Low Level
BRT, ENA Logic-Input High Level
BRT, ENA Logic-Input Low Level
INPUT LEAKAGE
SHDN
Leakage Current
CS Leakage Current
OSC Leakage Current
BRT, ENA Leakage Current
FSET, ISET Leakage Current
OV Leakage Current
FSET = ISET = V
CC
V
SHDN
= 26V
V
CS
= GND
-3
-1
-1
-0.1
+35
+50
+3
+1
+1
+0.1
µA
µA
µA
µA
µA
µA
2.1
0.8
2.1
0.8
V
V
V
V
Duty cycle = 75%
V
OSC
= open
V
OSC
= GND
0.9
675
450
94
85
115
10mA from EXT to GND
-10mA from EXT to V
CC
EXT high or low
V
CC
-
0.4
1.5
V
CC
-2.0
0.4
1.1
825
550
V
CC
-
0.1
0.1
5
V
V
Ω
V
V
V
MHz
kHz
%
mV
Rising edge, hysteresis = 20mV
V
SHDN
= 5V, 6V < V
IN
< 26V, 0 < I
VCC
< 10mA
4.7
12
4.00
V
IN
= 26V
V
IN
= V
CC
= 5V
CONDITIONS
MIN
4.5
5.5
TYP
MAX
5.5
26.0
2
2
10
5.3
130
4.45
UNITS
V
mA
µA
V
mA
V
IN Quiescent Current
www.maximintegrated.com
Maxim Integrated
│
4
MAX8790
Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
Electrical Characteristics (continued)
(Circuit of Figure 1. V
IN
= 12V, V
SHDN
= V
IN
, CCV = 0.1μF,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
LED CURRENT
ISET = V
CC
, BRT = 100%
Full-Scale FB_ Output Current
R
ISET
= 80kΩ to GND, BRT = 100%
R
ISET
= 133kΩ to GND, BRT = 100%
ISET High-Level Threshold
ISET Voltage
20% Output Current
Current Regulation Between
Strings
Minimum FB_ Regulation Voltage
Maximum FB_ Ripple
FB_ On-Resistance
FB_ Leakage Current
BRT Input Frequency
FAULT PROTECTION
OV Threshold Voltage
FB_ Overvoltage Threshold
FAULT Shutdown Timer
PHASE-LOCKED LOOP
FSET High-Level Threshold
BRT Frequency Capture Range
PLL disabled
R
FSET
= 500kΩ
R
FSET
= 250kΩ
V
CC
-
0.4
150
300
250
500
V
Hz
Hz
V
FB_
> 5.6V (typ)
1.16
V
CC
+
0.2
50
1.30
V
CC
+
1.45
80
V
V
ms
ISET = V
CC
, BRT = 20%
ISET = V
CC
, BRT = 100%
ISET = V
CC
, BRT = 20%
R
ISET
= 80kΩ to GND, BRT = 100%
ISET= V
CC
, BRT = 100%
ISET = V
CC
, BRT = 12.5%
ISET= V
CC
, COUT = 1µF, OSC = V
CC
(Note 1)
V
FB_
= 50mV
SHDN
= GND, V
FB_
= 26V
SHDN
= V
IN
, BRT = GND, V
FB_
= 15V
100
Default setting for 20mA full-scale LED current
19.2
24.0
14.4
V
CC
-
0.4
1.12
3.8
-2
-3
280
250
140
1.26
4.2
+2
+3
840
760
530
200
20
1
28
500
mV
P-P
Ω
µA
Hz
mV
20.8
26.0
15.6
V
V
mA
%
mA
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Specifications are guaranteed by design, not production tested.
Note 2:
Specifications to -40°C are guaranteed by design, not production tested.
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