Electrical characteristics – Rainbow Electronics MAX8709 User Manual
Page 4
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)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
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
kHz
Minimum Off-Time
180
380
ns
Maximum Off-Time
18
38
µs
Current-Limit Threshold
LX1 - GND, LX2 - GND (Fixed)
ILIM = V
CC
180
220
mV
V
ILIM
= 0.5V
80
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
V
IFB Regulation Point
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
µA
VFB Regulation Point
490
530
mV
VFB Zero-Voltage Crossing Threshold
-10
+10
mV
Digital PWM Chopping Frequency
200
220
Hz