Wide brightness range ccfl backlight controllers – Rainbow Electronics MAX1839 User Manual
Page 2
MAX1739/MAX1839
†
Wide Brightness Range
CCFL Backlight Controllers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 8.2V, V
SH
/SUS = V
SH
= 5.5V, MINDAC = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
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.
V
BATT
to GND ...........................................................-0.3V to 30V
V
BST
, V
SYNC
to GND.................................................-0.3V to 34V
V
BST
to V
LX
.................................................................-0.3V to 6V
V
DH
to V
LX
.................................................-0.3V to (V
BST
+ 0.3V)
V
LX
to GND...................................................-6V to (V
BST
+ 0.3V)
VL to GND...................................................................-0.3V to 6V
V
CCV
, V
CCI
, V
REF
, V
DL1
, V
DL2
to GND .........-0.3V to (VL + 0.3V)
V
MINDAC
, V
CTFB
, V
CSAV
to GND ................................-0.3V to 6V
V
CS
to GND...................................................-0.6V to (VL + 0.3V)
V
MODE
to GND.............................................................-6V to 12V
V
CRF/SDA
, V
CRF
, V
CTL/SCL
, V
CTL
, V
SH/SUS
,
V
SH
to GND ............................................................-0.3V to 6V
Continuous Power Dissipation (T
A
= +70°C)
20-Pin QSOP (derate 9.1mW/°C above +70°C)...........727mW
Operating Temperature .......................................-40°C to +85°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY AND REFERENCE
V
L
= V
BATT
4.6
5.5
V
BATT
Input Voltage Range
V
L
= open
6
28
V
V
BATT
= 28V
3.2
6
V
BATT
Quiescent Current, Operation
with Full Duty Cycle on DH
DH = DL1 = DL2 = open
V
BATT
= V
L
= 5V
3.2
6
mA
V
BATT
Quiescent Current, Shutdown
SH/SUS = SH = GND
6
20
µA
VL Output Voltage, Normal Operation
6V < V
BATT
< 28V, 0 < I
LOAD
< 15mA
5.0
5.35
5.5
V
VL Output Voltage, Shutdown
SH/SUS = SH = GND, no load
3.5
4.5
5.5
V
VL rising (leaving lockout)
4.6
VL Undervoltage Lockout Threshold
VL falling (entering lockout)
4.0
V
VL Undervoltage Lockout Hysteresis
300
mV
REF Output Voltage, Normal
Operation
4.5V < VL < 5.5V, I
REF
= 40
µA
1.96
2.00
2.04
V
V
L
POR Threshold
0.9
2.7
V
SWITCHING REGULATOR
DH Driver On-Resistance
18
Ω
DL1, DL2 Driver On-Resistance
18
Ω
Minimum DH Switching Frequency
1/t
DH
, SYNC = CS or GND, not synchronized
49
56
64
kHz
DH Minimum Off-Time
250
375
500
ns
DH Maximum Duty Cycle
98
%
SYNC Synchronization Range
Detect falling edges on SYNC
64
200
kHz
SYNC Input Current
0 < V
SYNC
< 30V
-2
2
µA
SYNC Input Threshold
SYNC falling, referred to CS
400
500
600
mV
SYNC Input Hysteresis
Referred to the SYNC input threshold
50
100
150
mV
SYNC Threshold Crossing to DL1,
DL2 Toggle Delay
V
SYNC
= 0 to 5V, C
DL_1
and
C
DL_2
< 100pF,
50% point on SYNC to 50% point on DL1 or DL2
120
ns
CS Overcurrent Threshold
408
450
492
mV