Rainbow Electronics MAX8759 - Manual (Page 2)

MAX8759
Low-Cost, SMBus, CCFL Backlight Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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.)
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.
BATT to GND..........................................................-0.3V to +30V
BST1, BST2 to GND ...............................................-0.3V to +36V
BST1 to LX1, BST2 to LX2 ........................................-0.3V to +6V
FREQ, V
CC , VDD to GND .........................................-0.3V to +6V
SDA, SCL to GND.....................................................-0.3V to +6V
ALS, COMP, PWMI, PWMO,
TFLT, DEL, VALS to GND .......................-0.3V to (V CC + 0.3V)
GH1 to LX1 ..............................................-0.3V to (V BST1 + 0.3V)
GH2 to LX2 ..............................................-0.3V to (V BST2 + 0.3V)
GL1, GL2 to GND .......................................-0.3V to (V DD + 0.3V)
IFB1, IFB2, ISEC, VFB to GND ....................................-3V to +6V
PGND1, PGND2 to GND .......................................-0.3V to +0.3V
Continuous Power Dissipation (T
A = +70 °C)
28-Pin Thin QFN 5mm x 5mm
(derate 21.3mW/
°C above +70°C).............................1702mW
Operating Temperature Range ...........................-40 °C to +85°C
Junction Temperature ......................................................+150 °C
Storage Temperature Range .............................-65 °C to +150°C
Lead Temperature (soldering, 10s) .................................+300 °C
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 2.5 5
BATT Quiescent Current MAX8759 is enabled
V BATT = V CC = 5V 5
mA
BATT Quiescent Current, Shutdown MAX8759 is disabled 0.1 2 µA
V CC Output Voltage, Normal Operation
MAX8759 is enabled, 6V < V BATT < 28V,
0 < I LOAD < 10mA
5.2 5.35 5.5 V
V CC Output Voltage, Shutdown MAX8759 is disabled, no load 3.5 4.3 5.5 V
V CC rising (leaving lockout) 4.3
V CC Undervoltage Lockout Threshold
V CC falling (entering lockout) 3.7
V
V CC Undervoltage Lockout Hysteresis 230 mV
V CC POR Threshold Rising edge 1.75 V
V CC POR Hysteresis 50 mV
GH1, GH2, GL1, GL2 On-Resistance,
Low State
I TEST = 100mA, V CC = V DD = 5V 3 6 Ω
GH1, GH2, GL1, GL2 On-Resistance,
High State
I
TEST
= 100mA, V
CC
= V
DD
= 5V 10 18 Ω
BST1, BST2 Leakage Current V BST _ = 12V, V LX _ = 7V 4 10 µA
Resonant Frequency Range Guaranteed by design 30 80 kHz
Minimum On-Time 350 500 700 ns
Maximum Off-Time 40 60 80 µs
Current-Limit Threshold LX1 - PGND1, LX2 - PGND2 415 430 445 mV
Zero-Current-Crossing Threshold LX1 - PGND1, LX2 - PGND2 3 8 13 mV
Current-Limit Leading-Edge Blanking 350 ns
IFB1, IFB2 Input-Voltage Range -3 +3 V
IFB1 Regulation Point 765 785 805 mV
IFB2 Regulation Point 780 800 820 mV