MAX1739 Datasheet, PDF (2/26 Pages) Maxim Integrated Products – Wide Brightness Range CCFL Backlight Controllers

Wide Brightness Range
CCFL Backlight Controllers
ABSOLUTE MAXIMUM RATINGS
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
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.
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.)
PARAMETER
SUPPLY AND REFERENCE
V_BATT Input Voltage Range
V_BATT Quiescent Current, Operation
with Full Duty Cycle on DH
V_BATT Quiescent Current, Shutdown
VL Output Voltage, Normal Operation
VL Output Voltage, Shutdown
VL Undervoltage Lockout Threshold
VL Undervoltage Lockout Hysteresis
REF Output Voltage, Normal
Operation
V_L POR Threshold
SWITCHING REGULATOR
DH Driver On-Resistance
DL1, DL2 Driver On-Resistance
Minimum DH Switching Frequency
DH Minimum Off-Time
DH Maximum Duty Cycle
SYNC Synchronization Range
SYNC Input Current
SYNC Input Threshold
SYNC Input Hysteresis
SYNC Threshold Crossing to DL1,
DL2 Toggle Delay
CS Overcurrent Threshold
CONDITIONS
V_L = V_BATT
V_L = open
DH = DL1 = DL2 = open
SH/SUS = SH = GND
V_BATT = 28V
V_BATT = V_L = 5V
6V < V_BATT < 28V, 0 < I_LOAD < 15mA
SH/SUS = SH = GND, no load
VL rising (leaving lockout)
VL falling (entering lockout)
4.5V < VL < 5.5V, I_REF = 40µA
1/t_DH, SYNC = CS or GND, not synchronized
Detect falling edges on SYNC
0 < V_SYNC < 30V
SYNC falling, referred to CS
Referred to the SYNC input threshold
V_SYNC = 0 to 5V, C_{DL_1} and C_{DL_2} < 100pF,
50% point on SYNC to 50% point on DL1 or DL2
MIN TYP MAX UNITS
4.6
5.5
V
6
28
3.2
6
mA
3.2
6
6
20
µA
5.0
5.35
5.5
V
3.5
4.5
5.5
V
4.6
4.0
V
300
mV
1.96 2.00 2.04
V
0.9
2.7
V
18
Ω
18
Ω
49
56
64
kHz
250
375
500
ns
98
%
64
200
kHz
-2
2
µA
400
500
600
mV
50
100
150
mV
120
ns
408
450
492
mV
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