MAX8722 datasheet(2/20 Pages) MAXIM

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Low-Cost CCFL Backlight Controller

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1. VBATT = 12V, VCC = VDD, VSHDN = 5.3V, TA = 0°C to +85°C. Typical values are at TA = +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

CNTL, FREQ, SYNC, VCC, VDD to GND ...................-0.3V to +6V

COMP, DPWM, ILIM, TFLT to GND ............-0.3V to (VCC + 0.3V)

GH1 to LX1 ..............................................-0.3V to (VBST1 + 0.3V)

GH2 to LX2 ..............................................-0.3V to (VBST2 + 0.3V)

GL1, GL2 to GND .......................................-0.3V to (VDD + 0.3V)

IFB, ISEC, VFB to GND................................................-3V to +6V

SHDN to GND...........................................................-0.3V to +6V

PGND to GND .......................................................-0.3V to +0.3V

Continuous Power Dissipation (TA = +70°C)

24-Pin QSOP (derate 9.5mW/°C above +70°C)........761.9mW

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

VCC = VDD = VBATT

4.6

5.5

BATT Input Voltage Range

VCC = VDD = open

5.5

28.0

VBATT = 28V

BATT Quiescent Current

VSHDN = VCC, VIFB = 1V

VBATT = VCC = 5V

BATT Quiescent Current,

Shutdown

SHDN = GND

µA

VCC Output Voltage, Normal

Operation

VSHDN = 5.5V, 6V < VBATT < 28V,

0 < ILOAD < 10mA

5.25

5.40

5.55

VCC Output Voltage, Shutdown

SHDN = GND, no load

3.5

4.6

5.5

VCC rising (leaving lockout)

4.58

VCC Undervoltage-Lockout

Threshold

VCC falling (entering lockout)

4.0

VCC Undervoltage-Lockout

Hysteresis

200

GH1, GH2, GL1, GL2 On-

Resistance, High

ITEST = 10mA, VCC = VDD = 5.3V

Ω

GH1, GH2, GL1, GL2 On-

Resistance, Low

ITEST = 10mA, VCC = VDD = 5.3V

Ω

GH1, GH2, GL1, GL2 Maximum

Output Current

0.3

BST1, BST2 Leakage Current

VBST_ = 12V, VLX_ = 7V

µA

Resonant Frequency Range

Guaranteed by design

kHz

Minimum Off-Time

340

470

600

Maximum Off-Time

µs

Current-Limit Threshold

LX1 to PGND, LX2 to PGND

(Fixed)

ILIM = VCC

180

200

220

VILIM = 0.5V

100

120

Current-Limit Threshold

LX1 to PGND, LX2 to PGND

(Adjustable)

VILIM = 2.0V

370

400

430

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