MAX1984ETP 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1984ETP

Ultra-High-Efficiency White LED Drivers

Maxim Integrated 

Ultra-High-Efficiency White

LED Drivers

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1; VIN = 3.3V, SETI = BITA = BITB = BITC = SEL = IN, MODE = GND, COUT = 4.7µF, CREF = 0.22µF, TA = -40°C to

+85°C, unless otherwise noted.) (Note 3)

PARAMETER

LD1 to LD8 Regulation Voltage

SETI High-Level Threshold

(18mA LED Default Current)

CONDITIONS

SETI = IN, ILX = 120mA (MAX1984),

110mA (MAX1985), 98mA (MAX1986)

2.7V < VIN < 5.5V

MIN TYP MAX UNITS

80

120

mV

VIN - 0.4

V

SETI Low-Level Threshold

(0.5mA LED Default Current)

2.7V < VIN < 5.5V

50

SETI Output Current

SETI = GND

40

OUTPUT CURRENT SOURCE

LD1 to LD8 On-Resistance

LD1 to LD8 Current-Source

Compliance

ILD_ = 25mA, VOUT = 3.5V

BITA = BITB = BITC = IN, 80mV < VLD_ < 1V (Note 1)

DIGITAL BRIGHTNESS CONTROL

2-Bit Control DAC LSB

MODE = SETI = BITB = IN, BITA = BITC = GND

26

3-Bit Control DAC LSB

SETI = BITC = IN, MODE = BITA = BITB = GND

7

(Note 2)

DPWM BRIGHTNESS CONTROL

DPWM Input Supply Range

MODE = BITC = IN

2.3

DPWM Shutdown Duty Cycle

BITC = GND

3

Note 1: Current variation is caused by the current source voltage changes.

Note 2: Measurement is with respect to 100% of the programmed LED output current.

Note 3: Specifications to -40°C are guaranteed by design, not production tested.

125

mV

100

µA

4

Ω

8

%

39

%

21

%

5.5

V

7

%

_______________________________________________________________________________________ 5

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