MAX8790 datasheet(2/24 Pages) MAXIM

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1. VIN = 12V, VSHDN = VIN, CCV = 0.1µF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

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.

IN, SHDN, to GND .................................................-0.3V to +28V

FB_ to GND ............................................................-0.3V to +28V

VCC, BRT, ENA, OSC, OV to GND ...........................-0.3V to +6V

ISET, CCV, CS, FSET, CPLL, EXT to GND .-0.3V to (VCC + 0.3V)

Continuous Power Dissipation (TA = +70°C)

20-Pin Thin QFN (derate 16.9mW/°C above +70°C) ...1349mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Six-String White LED Driver with Active

Current Balancing for LCD Panel Applications

_______________________________________________________________________________________

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN = VCC

4.5

5.5

IN Input Voltage Range

VCC = bypassed to GND through 1µF cap

5.5

26.0

VIN = 26V

VSHDN = high

VIN = VCC = 5V

IN Quiescent Current

SHDN = GND

µA

VCC Output voltage

VSHDN = 5V, 6V < VIN < 26V, 0 < IVCC < 10mA

4.7

5.0

5.3

VCC Short-Circuit Current

130

VCC UVLO Threshold

Rising edge, hysteresis = 20mV

4.00

4.25

4.45

STEP-UP CONVERTER

EXT High Level

10mA from EXT to GND

VCC -

0.1

VCC

EXT Low Level

-10mA from EXT to VCC

0.1

EXT On-Resistance

EXT high or low

EXT Sink/Source Current

EXT forced to 2V

OSC High-Level Threshold

VCC -

0.4

OSC Midlevel Threshold

1.5

VCC -

2.0

OSC Low-Level Threshold

0.4

VOSC = VCC

0.9

1.0

1.1

MHz

VOSC = open

675

750

825

Operating Frequency

VOSC = GND

450

500

550

kHz

PWM mode

Minimum Duty Cycle

Pulse skipping, no load

Maximum Duty Cycle

CS Trip Voltage

Duty cycle = 75%

100

115

CONTROL INPUT

SHDN Logic-Input High Level

2.1

SHDN Logic-Input Low Level

0.8

BRT, ENA Logic-Input High Level

2.1

BRT, ENA Logic-Input Low Level

0.8

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