
MAX8709
High-Efficiency CCFL Backlight
Controller with SMBus Interface
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V
BATT
= 12V, V
LOT
= V
REF
, V
CC
= V
DD,
V
SUS
= 5.3V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C,
unless otherwise noted.) (Note 2)
MIN TYP MAX
V
CC
= V
DD
= V
BATT
4.6 5.5
V
BATT
Input Voltage Range
V
CC
= V
DD
= open 5.5
28.0
V
V
BATT
= 28V 3
V
BATT
Quiescent Current V
SUS
= 5.5V
V
BATT
= V
CC
= 5V
3
mA
V
BATT
Quiescent Current, Shutdown SUS = GND 20 µA
V
CC
Output Voltage, Normal Operation
V
SUS
= 5.5V, 6V < V
BATT
< 28V,
0 < I
LOAD
< 20mA
5.0 5.5 V
V
CC
Output Voltage, Shutdown SUS = GND, no load 3.5 5.5 V
V
CC
rising (leaving lockout) 4.5
V
CC
Undervoltage-Lockout Threshold
V
CC
falling (entering lockout) 4.0
V
V
CC
Power-On Reset (POR) Threshold Rising edge
0.90 2.70
V
REF Output Voltage, Normal Operation 4.5V < V
CC
< 5.5V, I
LOAD
= 40µA
1.95 2.05
V
GH1, GH2, GL1, GL2 On-Resistance I
TEST
= 100mA, V
CC
= V
DD
= 5.3V 18 Ω
BST1, BST2 Leakage Current V
BST
_ = 12V, V
LX
_ = 7V 5 µA
Input Resonant Frequency Guaranteed by design 25
300
180 380
ns
Maximum Off-Time 18 38 µs
Current-Limit Threshold
LX1 - GND, LX2 - GND (Fixed)
ILIM = V
CC
180 220
120
Current-Limit Threshold
LX1 - GND, LX2 - GND (Adjustable)
V
ILIM
= 2.0V
370 430
mV
Current-Limit Leading-Edge Blanking
250 450
ns
LOT Input Voltage Range 0.5
V
REF
V
LOT Input Bias Current -2 +2 µA
IFB Input Voltage Range
-1.7 +1.7
380 420
mV
IFB Input Bias Current V
IFB
= 0.4V -2 +2 µA
IFB Lamp-Out Threshold LOT = REF
500 700
mV
ISEC Input Voltage Range -2 +2 V
ISEC Regulation Point
1.20 1.30
V
ISEC Input Bias Current V
ISEC
= 1.25V -2 +2 µA
VFB Input Voltage Range -2 +2 V
VFB Input Bias Current V
VFB
= 0.5V
-0.5 +0.5
490 530
mV
VFB Zero-Voltage Crossing Threshold -10
+10
mV
Digital PWM Chopping Frequency
200 220
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