Rainbow Electronics MAX8759 - Manual (Page 3)

MAX8759
Low-Cost, SMBus, CCFL Backlight Controller
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ELECTRICAL CHARACTERISTICS (continued)
(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.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
0 < V IFB1,2 < 3V -3 +3
IFB1, IFB2 Input Bias Current
-3V < V IFB1,2 < 0 -230
µA
IFB1, IFB2 Lamp-Out Threshold 575 600 625 mV
IFB1, IFB2 to COMP Transconductance 0.5V < V COMP < 4V 60 100 160 µS
COMP Output Impedance 6 12 24 M Ω
COMP Discharge Current During Overvoltage
or Overcurrent Fault
V VFB = 2.6V or V ISEC = 1.5V 500 1000 2000 µA
COMP Discharge Current During DPWM
Off-Time
V COMP = 1.5V 90 110 130 µA
DPWM Rising-to-Falling Ratio V IFB1,2 = 0 2.5
ISEC Input Voltage Range -3 +3 V
ISEC Overcurrent Threshold 1.18 1.21 1.26 V
ISEC Input Bias Current V ISEC = 1.25V -0.3 +0.3 µA
VFB Input Voltage Range -4 +4 V
VFB Input Impedance 150 300 450 M Ω
VFB Overvoltage Threshold 2.1 2.3 2.5 V
VFB Undervoltage Threshold 210 240 280 mV
VFB Undervoltage Delay R FREQ = 169k Ω 250 µs
R FREQ = 169k Ω, T
A = +25°C to +85°C 207 210 213
R FREQ = 169k Ω 205 210 215
R FREQ = 340k Ω 106
DPWM Oscillator Frequency
R FREQ = 100k Ω 343
Hz
PWMO Output Impedance 20 40 60 k Ω
PWMI Input Low Voltage 0.7 V
PWMI Input High Voltage 2.1 V
PWMI Input Hysteresis 300 mV
PWMI Input Bias Current -0.3 +0.3 µA
PWMI Input Frequency Range 5 50 kHz
PWMI Full-Range Accuracy 5 LSB
PWMI duty cycle = 100% 98 100
PWMI duty cycle = 50% 48 50 52 PWMI Brightness Setting
PWMI duty cycle = 0% 9.7 10.0 10.3
%
ALS Full-Adjustment Range 0 1.8 V
ALS Full-Range Accuracy 5 LSB
ALS Input Bias Current -0.1 +0.1 µA
VALS Output Voltage
MAX8759 is enabled, 6V < V BATT < 28V,
I LOAD = 1mA
5.10 5.30 5.50 V
VALS Leakage Current MAX8759 is disabled, VALS = GND -3 +3 µA
VALS On-Resistance MAX8759 is enabled 30 60 Ω