MAX1839 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX1839 Datasheet PDF : 26 Pages
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Wide Brightness Range
CCFL Backlight Controllers
ELECTRICAL CHARACTERISTICS
(V+ = 8.2V, VSH/SUS = VSH = 5.5V, MINDAC = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 6)
PARAMETER
CONDITIONS
MIN TYP
SUPPLY AND REFERENCE
VBATT Input Voltage Range
VL = VBATT
VL = open
4.6
6
VBATT Quiescent Current, Shutdown
SH/SUS = SH = GND
VL Output Voltage, Normal Operation 6V < VBATT < 28V,
5.0
0 < ILOAD < 15mA
VL rising (leaving lockout)
VL Undervoltage Lockout Threshold
VL falling (entering lockout)
4.0
REF Output Voltage, Normal
Operation
4.5V < VL < 5.5V, IREF = 40µA
1.95
VL POR Threshold
0.9
SWITCHING REGULATOR
DH Driver On-Resistance
DL1, DL2 Driver On-Resistance
SYNC Synchronization Range
Detect falling edges on SYNC
64
CS Overcurrent Threshold
408
DAC AND ERROR AMPLIFIER
CSAV Regulation Point
VMINDAC = 0, DAC code = 11111 binary
186
CTFB Regulation Point
560
CTFB to CCV Transconductance
1V < VCCV < 2.7V
30
ANALOG INTERFACE BRIGHTNESS CONTROL (MODE connected to REF or MODE connected to GND)
SH Input Low Voltage
SH Input High Voltage
2.1
SYSTEM MANAGEMENT BUS BRIGHTNESS CONTROL (MODE connected to VL)
CRF/SDA, CTL/SCL, SH/SUS Input
Low Voltage
CRF/SDA, CTL/SCL, SH/SUS Input
High Voltage
2.1
MAX UNITS
5.5
V
28
20
µA
5.6
V
4.6
V
2.05
V
2.7
V
18
Ω
18
Ω
200
kHz
492
mV
202
mV
640
mV
50 µmho
0.8
V
V
0.8
V
V
CRF/SDA Output Low Sink Current
VCRF/SDA = 0.4V
Note 1: Corresponds to 512 DPWM cycles or 65536 MODE
cycles.
Note 2: When the buck switch is shorted, VCTFB goes high
causing VCCV to go below the fault detection threshold.
Note 3: Corresponds to 64 DPWM cycles or 8192 MODE cycles.
Note 4: The MODE pin thresholds are only valid while the part is
operating. In shutdown, VREF = 0 and the part only
differentiates between SMB mode and ADC mode. In
shutdown with ADC mode selected, the CRF/SDA and
CTL/SCL pins are at high impedance and will not cause
extra supply current when their voltages are not at
GND or VL.
4
mA
Note 5: The amplitude is measured with the following circuit:
VAMPLITUDE > 2V
500pF
MODE
10k
Note 6: Specifications from -40°C to +85°C are guaranteed by
design, not production tested.
_______________________________________________________________________________________ 5
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