Rainbow Electronics MAX8709 - Manual (Page 3)

MAX8709
High-Efficiency CCFL Backlight
Controller with SMBus Interface
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ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V BATT = 12V, V LOT = V REF , V CC = V DD, V SUS = 5.3V, T A = 0°C to +85°C. Typical values are at T
A = +25°C,
unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
LOT Input Voltage Range 0.5 V REF V
LOT Input Bias Current -2 +2 µA
IFB Input Voltage Range -1.7 +1.7 V
IFB Regulation Point 380 400 420 mV
IFB Input Bias Current V IFB = 0.4V -2 +2 µA
IFB Lamp-Out Threshold LOT = REF 500 600 700 mV
IFB to CCI Transconductance 1V < V CCI < 2.5V 100 µS
CCI Output Impedance 20 M
Ω
ISEC Input Voltage Range -2 +2 V
ISEC Regulation Threshold 1.20 1.25 1.30 V
ISEC Input Bias Current V ISEC = 1.25V -2 +2 µA
VFB Input Voltage Range -2 +2 V
VFB Input Bias Current V VFB = 0.5V -0.5 +0.5 µA
VFB Regulation Point 490 510 530 mV
VFB to CCV Transconductance 1V < V CCV < 2.7V 40 µS
VFB Zero-Voltage Crossing Threshold -10 +10 mV
CCV Output Impedance 20 M
Ω
Digital PWM Chopping Frequency 200 210 220 Hz
Lamp-Out Detection Timeout Timer V IFB < 0.1V (Note 1) 1.14 1.22 1.30 s
SDA, SCL, SUS Input Low Voltage 0.8 V
SDA, SCL, SUS Input High Voltage 2.1 V
SDA, SCL, SUS Input Hysteresis 300 mV
SDA, SCL, SUS Input Bias Current -1 +1 µA
SDA Output Low Sink Current V SDA = 0.4V 4 mA
SCL Serial Clock High Period T HIGH 4 µs
SCL Serial Clock Low Period T LOW 4.7 µs
Start-Condition Setup Time t SU:STA 4.7 µs
Start-Condition Hold Time t
HD:STA
4 µs
SDA Valid to SCL Rising-Edge Setup Time,
Slave Clocking-In Data
t SU:DAT 250 ns
SCL Falling Edge to SDA Transition t HD:DAT 0 ns
SCL Falling Edge to SDA Valid,
Reading Out Data
T DV 700 ns