Max8759 low-cost, smbus, ccfl backlight controller – Rainbow Electronics MAX8759 User Manual
Page 2
MAX8759
Low-Cost, SMBus, CCFL Backlight Controller
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
BATT
= 12V, V
CC
= V
DD,
T
A
= 0°C to +85°C. Typical values are at T
A
= +25
°C, unless otherwise noted.)
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.
BATT to GND..........................................................-0.3V to +30V
BST1, BST2 to GND ...............................................-0.3V to +36V
BST1 to LX1, BST2 to LX2 ........................................-0.3V to +6V
FREQ, V
CC
, VDD to GND .........................................-0.3V to +6V
SDA, SCL to GND.....................................................-0.3V to +6V
ALS, COMP, PWMI, PWMO,
TFLT, DEL, VALS to GND .......................-0.3V to (V
CC
+ 0.3V)
GH1 to LX1 ..............................................-0.3V to (V
BST1
+ 0.3V)
GH2 to LX2 ..............................................-0.3V to (V
BST2
+ 0.3V)
GL1, GL2 to GND .......................................-0.3V to (V
DD
+ 0.3V)
IFB1, IFB2, ISEC, VFB to GND ....................................-3V to +6V
PGND1, PGND2 to GND .......................................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70
°C)
28-Pin Thin QFN 5mm x 5mm
(derate 21.3mW/
°C above +70°C).............................1702mW
Operating Temperature Range ...........................-40
°C to +85°C
Junction Temperature ......................................................+150
°C
Storage Temperature Range .............................-65
°C to +150°C
Lead Temperature (soldering, 10s) .................................+300
°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
= V
DD
= V
BATT
4.5
5.5
BATT Input Voltage Range
V
CC
= V
DD
= open
5.5
28.0
V
V
BATT
= 28V
2.5
5
BATT Quiescent Current
MAX8759 is enabled
V
BATT
= V
CC
= 5V
5
mA
BATT Quiescent Current, Shutdown
MAX8759 is disabled
0.1
2
µA
V
CC
Output Voltage, Normal Operation
MAX8759 is enabled, 6V < V
BATT
< 28V,
0 < I
LOAD
< 10mA
5.2
5.35
5.5
V
V
CC
Output Voltage, Shutdown
MAX8759 is disabled, no load
3.5
4.3
5.5
V
V
CC
rising (leaving lockout)
4.3
V
CC
Undervoltage Lockout Threshold
V
CC
falling (entering lockout)
3.7
V
V
CC
Undervoltage Lockout Hysteresis
230
mV
V
CC
POR Threshold
Rising edge
1.75
V
V
CC
POR Hysteresis
50
mV
GH1, GH2, GL1, GL2 On-Resistance,
Low State
I
TEST
= 100mA, V
CC
= V
DD
= 5V
3
6
Ω
GH1, GH2, GL1, GL2 On-Resistance,
High State
I
TEST
= 100mA, V
CC
= V
DD
= 5V
10
18
Ω
BST1, BST2 Leakage Current
V
BST
_ = 12V, V
LX
_ = 7V
4
10
µA
Resonant Frequency Range
Guaranteed by design
30
80
kHz
Minimum On-Time
350
500
700
ns
Maximum Off-Time
40
60
80
µs
Current-Limit Threshold
LX1 - PGND1, LX2 - PGND2
415
430
445
mV
Zero-Current-Crossing Threshold
LX1 - PGND1, LX2 - PGND2
3
8
13
mV
Current-Limit Leading-Edge Blanking
350
ns
IFB1, IFB2 Input-Voltage Range
-3
+3
V
IFB1 Regulation Point
765
785
805
mV
IFB2 Regulation Point
780
800
820
mV