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.
VBATT 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
= 40µA 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
(18 strony)
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