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MAX8790A

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

Maxim Integrated 

MAX8790A

Six-String White LED Driver with Active

Current Balancing for LCD Panel Applications

Absolute Maximum Ratings

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

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

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

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

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)

TQFN (derate 16.9mW/°C above +70°C)....................1349mW

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

CONDITIONS

MIN TYP MAX UNITS

IN Input Voltage Range

IN Quiescent Current

VIN = VCC

VCC = bypassed to GND through 1µF capacitor

VSHDN = high,

BRT = GND

VIN = 26V

VIN = VCC = 5V

SHDN = GND

4.5

5.5

V

5.5

26.0

1

2

mA

1

2

10

µA

VCC Output voltage

VCC Short-Circuit Current

VCC UVLO Threshold

STEP-UP CONVERTER

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

Rising edge, hysteresis = 20mV

4.7

5.0

5.3

V

15

56

130

mA

4.00 4.25 4.45

V

EXT High Level

10mA from EXT to GND

VCC -

0.1

VCC

V

EXT Low Level

EXT On-Resistance

-10mA from EXT to VCC

EXT high or low

0

0.1

V

2

5

Ω

EXT Sink/Source Current

EXT forced to 2V

1

A

OSC High-Level Threshold

VCC -

0.4

V

OSC Midlevel Threshold

1.5

VCC -

2.0

V

OSC Low-Level Threshold

0.4

V

Operating Frequency

Minimum Duty Cycle

VOSC = VCC

VOSC = open

VOSC = GND

PWM mode

Pulse skipping, no load

0.9

1.0

1.1

MHz

675

750

825

kHz

450

500

550

10

%

0

Maximum Duty Cycle

94

95

%

CS Trip Voltage

Duty cycle = 75%

85

100

115

mV

CONTROL INPUT

SHDN Logic-Input High Level

2.1

V

SHDN Logic-Input Low Level

0.8

V

BRT, ENA Logic-Input High Level

2.1

V

BRT, ENA Logic-Input Low Level

0.8

V

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