MAX8722 Maxim Integrated Products, MAX8722 Datasheet - Page 3

• Manufacturer Part Number: MAX8722
• Description: Low-Cost CCFL Backlight Controller
• Manufacturer: Maxim Integrated Products

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ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
Zero-Current Crossing Threshold
LX1 to GND, LX2 to GND
Current-Limit Leading Edge
Blanking
IFB Input Voltage Range
IFB Regulation Point
IFB Input Bias Current
IFB Lamp-Out Threshold
IFB 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 Overcurrent Threshold
ISEC Input Bias Current
VFB Input Bias Current
VFB Overvoltage Threshold
DPWM Chopping Frequency
DPWM Input Low Voltage
DPWM Input High Voltage
DPWM Input Hysteresis
DPWM Input Bias Current
DPWM Output Low Resistance
DPWM Output High Resistance
SYNC Input Low Voltage
SYNC Input High Voltage
SYNC Input Hysteresis
SYNC Input Bias Current
SYNC Input Frequency Range
CNTL Minimum Duty-Cycle
Threshold
CNTL Maximum Duty-Cycle
Threshold
CNTL Input Current
DPWM ADC Resolution
PARAMETER
BATT
_______________________________________________________________________________________
= 12V, V
Low-Cost CCFL Backlight Controller
CC
= V
0 < V
-2V < V
0.5V < V
V
CNTL = GND, V
V
0 < V
V
R
R
R
SYNC = V
SYNC = V
SYNC = V
SYNC = V
SYNC = GND, FREQ = V
SYNC = V
V
0 < V
Guaranteed monotonic
IFB
IFB
VFB
SYNC
FREQ
FREQ
FREQ
DD
= 800mV, V
= 0
IFB
ISEC
CNTL
= 0.5V
, V
= 100k
= 169k
= 340k
= 2V
IFB
SHDN
COMP
< 2V
CC
CC
CC
CC
CC
< 2V
< 0
< V
, R
, R
, R
, R
, FREQ = V
= 5.3V, T
CC
< 4V
FREQ
FREQ
FREQ
FREQ
COMP
ISEC
= 169k
= 169k
= 169k
= 169k
= 2V
CONDITIONS
= 2V
A
CC
CC
= 0°C to +85°C. Typical values are at T
-150
MIN
1.15
0.20
-0.3
-0.3
-0.3
-0.3
-0.1
240
770
560
204
2.2
2.1
2.1
1.9
A
60
10
-2
-2
1
7
= +25°C, unless otherwise noted.)
TYP
1.21
0.23
350
790
600
100
400
100
343
209
106
100
100
2.5
2.3
2.0
10
6
5
MAX
+0.3
+0.3
+0.3
+0.3
+0.1
1.28
0.26
460
810
640
160
214
2.4
0.8
2.4
2.4
0.8
2.1
+2
+2
12
18
50
UNITS
kHz
Bits
M
mV
mV
mV
mV
mV
k
k
µA
µS
µA
µA
µA
µA
Hz
µA
µA
µA
ns
V
V
V
V
V
V
V
V
V
3