MAX8790(2006) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8790
(Rev.:2006)

Six-String White LED Driver with Active Current Balancing for LCD Panel Applications

Maxim Integrated 

Six-String White LED Driver with Active

Current Balancing for LCD Panel Applications

ABSOLUTE MAXIMUM RATINGS

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

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.

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.)

PARAMETER

IN Input Voltage Range

IN Quiescent Current

VCC Output voltage

VCC Short-Circuit Current

VCC UVLO Threshold

STEP-UP CONVERTER

EXT High Level

EXT Low Level

EXT On-Resistance

EXT Sink/Source Current

OSC High-Level Threshold

CONDITIONS

VIN = VCC

VCC = bypassed to GND through 1µF cap

VSHDN = high

SHDN = GND

VIN = 26V

VIN = VCC = 5V

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

Rising edge, hysteresis = 20mV

10mA from EXT to GND

-10mA from EXT to VCC

EXT high or low

EXT forced to 2V

MIN TYP MAX UNITS

4.5

5.5

V

5.5

26.0

1

2

mA

1

2

10

µA

4.7

5.0

5.3

V

15

56

130

mA

4.00 4.25 4.45

V

VCC -

0.1

VCC

V

0

0.1

V

2

5

Ω

1

A

VCC -

V

0.4

OSC Midlevel Threshold

OSC Low-Level Threshold

Operating Frequency

Minimum Duty Cycle

Maximum Duty Cycle

CS Trip Voltage

CONTROL INPUT

SHDN Logic-Input High Level

SHDN Logic-Input Low Level

BRT, ENA Logic-Input High Level

BRT, ENA Logic-Input Low Level

VOSC = VCC

VOSC = open

VOSC = GND

PWM mode

Pulse skipping, no load

Duty cycle = 75%

1.5

VCC -

2.0

V

0.4

V

0.9

1.0

1.1

MHz

675

750

825

kHz

450

500

550

10

%

0

94

95

%

85

100

115

mV

2.1

V

0.8

V

2.1

V

0.8

V

2 _______________________________________________________________________________________

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