MAX8759 Maxim Integrated Products, MAX8759 Datasheet - Page 3

• Manufacturer Part Number: MAX8759
• Description: CCFL Backlight Controller
• Manufacturer: Maxim Integrated Products

ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IFB1, IFB2 Input Bias Current
IFB1, IFB2 Lamp-Out Threshold
IFB1, IFB2 to COMP Transconductance
COMP Output Impedance
COMP Discharge Current During Overvoltage
or Overcurrent Fault
COMP Discharge Current During DPWM
Off-Time
DPWM Rising-to-Falling Ratio
ISEC Input Voltage Range
ISEC Overcurrent Threshold
ISEC Input Bias Current
VFB Input Voltage Range
VFB Input Impedance
VFB Overvoltage Threshold
VFB Undervoltage Threshold
VFB Undervoltage Delay
DPWM Oscillator Frequency
PWMO Output Impedance
PWMI Input Low Voltage
PWMI Input High Voltage
PWMI Input Hysteresis
PWMI Input Bias Current
PWMI Input Frequency Range
PWMI Full-Range Accuracy
PWMI Brightness Setting
ALS Full-Adjustment Range
ALS Full-Range Accuracy
ALS Input Bias Current
VALS Output Voltage
VALS Leakage Current
VALS On-Resistance
Low-Cost, SMBus, CCFL Backlight Controller
PARAMETER
_______________________________________________________________________________________
BATT
= 12V, V
CC
= V
DD,
T
A
= 0°C to +85°C. Typical values are at T
0 < V
-3V < V
0.5V < V
V
V
V
V
R
R
R
R
R
PWMI duty cycle = 100%
PWMI duty cycle = 50%
PWMI duty cycle = 0%
MAX8759 is enabled, 6V < V
I
MAX8759 is disabled, VALS = GND
MAX8759 is enabled
LOAD
VFB
COMP
IFB1,2
ISEC
FREQ
FREQ
FREQ
FREQ
FREQ
IFB1,2
= 2.6V or V
= 1.25V
= 1mA
= 169kΩ
= 169kΩ, T
= 169kΩ
= 340kΩ
= 100kΩ
IFB1,2
= 0
= 1.5V
COMP
< 3V
< 0
< 4V
CONDITIONS
ISEC
A
= +25°C to +85°C
= 1.5V
BATT
< 28V,
A
= +25°C, unless otherwise noted.)
-230
1.18
5.10
MIN
575
500
-0.3
150
210
-0.3
-0.1
207
205
2.2
2.1
9.7
60
90
20
98
48
-3
-3
-4
-3
6
5
0
1000
TYP
1.21
10.0
5.30
600
100
110
300
240
250
210
210
106
343
300
100
2.5
2.3
12
40
50
30
MAX
2000
1.26
+0.3
+0.3
10.3
+0.1
5.50
625
160
130
450
280
213
215
2.4
0.7
1.8
+3
24
+3
+4
60
50
52
+3
60
5
5
UNITS
kHz
LSB
LSB
MΩ
MΩ
mV
mV
mV
µA
µS
µA
µA
µA
Hz
kΩ
µA
µA
µA
µs
%
Ω
V
V
V
V
V
V
V
V
3