Rainbow Electronics MAX8759 - Manual (Page 5)

MAX8759
Low-Cost, SMBus, CCFL Backlight Controller
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ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V BATT = 12V, V CC = V DD, T A = -40°C to +85°C.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V CC = V DD = V BATT 4.5 5.5
BATT Input Voltage Range
V CC = V DD = open 5.5 28.0
V
V BATT = 28V 5
BATT Quiescent Current MAX8759 is enabled
V BATT = V CC = 5V 5
mA
V CC Output Voltage, Normal Operation
MAX8759 is enabled, 6V < V BATT < 28V,
0 < I LOAD < 10mA
5.2 5.5 V
V CC Output Voltage, Shutdown MAX8759 is disabled, no load 3.5 5.5 V
V CC rising (leaving lockout) 4.3
V CC Undervoltage Lockout Threshold
V CC falling (entering lockout) 3.7
V
GH1, GH2, GL1, GL2 On-Resistance,
Low State
I TEST = 100mA, V CC = V DD = 5V 6 Ω
GH1, GH2, GL1, GL2 On-Resistance,
High State
I TEST = 100mA, V CC = V DD = 5V 18 Ω
Resonant Frequency Range Guaranteed by design 30 80 kHz
Minimum On-Time 350 700 ns
Maximum Off-Time 40 80 µs
Current-Limit Threshold LX1 - PGND1, LX2 - PGND2 410 450 mV
Zero-Current Crossing Threshold LX1 - PGND1, LX2 - PGND2 3 13 mV
IFB1, IFB2 Input Voltage Range -3 +3 V
IFB1 Regulation Point 760 810 mV
IFB2 Regulation Point 775 825 mV
IFB1, IFB2 Input Bias Current -3V < V IFB1,2 < 0 -230 µA
IFB1, IFB2 Lamp-Out Threshold 565 635 mV
IFB1, IFB2 to COMP Transconductance 0.5V < V COMP < 4V 60 160 µS
COMP Output Impedance 6 25 M Ω
COMP Discharge Current During Overvoltage
or Overcurrent Fault
V VFB = 2.6V or V ISEC = 1.5V 500 2000 µA
COMP Discharge Current During DPWM
Off-Time
V COMP = 1.5V 90 130 µA
ISEC Input Voltage Range -3 +3 V
ISEC Overcurrent Threshold 1.18 1.26 V
VFB Input Voltage Range -4 +4 V
VFB Input Impedance 150 450 M Ω
VFB Overvoltage Threshold 2.1 2.5 V
VFB Undervoltage Threshold 210 280 mV
DPWM Oscillator Frequency R FREQ = 169k Ω 203 217 Hz
PWMO Output Impedance 20 60 k Ω