MAX8831 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8831

High-Efficiency, White LED Step-Up Converter with I2C Interface in 2mm x 2mm WLP

Maxim Integrated 

MAX8831

High-Efficiency, White LED

Step-Up Converter with I2C

Interface in 2mm x 2mm WLP

Typical Operating Characteristics (continued)

(VIN = 3.6V, VDD = 1.8V, CIN = 1µF, COUT = 1µF, CVDD = 0.1µF, CCOMP = 0.22µF, L = TOKO 1098AS-100M, ILED1 = ILED2 = 25.25mA,

ILED3 = ILED4 = ILED5 = 5mA, unless otherwise noted.)

LIGHT-LOAD SWITCHING WAVEFORMS

MAX8831 toc10

VIN

100mV/div

(AC-COUPLED)

VLX

VOUT

ILED1

ILED1 = 2mA

200ns/div

20V/div

0V

100mV/div

(AC-COUPLED)

4mA/div

0mA

HEAVY-LOAD SWITCHING WAVEFORMS

MAX8831 toc11

VIN

200mV/div

(AC-COUPLED)

20V/div

VLX

0V

1V/div

VOUT

(AC-COUPLED)

ILED1

20mA/div

ILED2

ILED1 = ILED2 = 25.25mA

200ns/div

0mA

20mA/div

0mA

SOFT-START RESPONSE

MAX8831 toc12

20V/div

VOUT

0V

200mA/div

IIN

0mA

20mA/div

ILED1

20mA/div

ILED2

0mA

20ms/div

SHUTDOWN RESPONSE

MAX8831 toc13

VOUT

20V/div

IIN

0V

200mA/div

0mA

ILED1

20mA/div

ILED2

20mA/div

0mA

40ms/div

MAXIMUM OUTPUT CURRENT

vs. INPUT VOLTAGE

140

120

100

80

60

40

20

0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

INPUT VOLTAGE (V)

LED1, LED2 CURRENT ACCURACY

vs. INPUT VOLTAGE

1.50

LED1, LED2: 8 LEDs

LED3 TO LED5: 9 LEDs AT 5mA

1.00

0.50

0

ILED1 (ILED2 = 25.25mA)

-0.50

-1.00

ILED2 (ILED1 = 25.25mA)

-1.50

2.5 3.0 3.5 4.0 4.5 5.0 5.5

INPUT VOLTAGE (V)

LED3-TO-LED5 CURRENT ACCURACY

vs. INPUT VOLTAGE

1.50

LED1, LED2: 8 LEDs AT 25.25mA

LED3 TO LED5: 9 LEDs

1.00

ILED4 (ILED5 = ILED3 = 5mA)

0.50

0

-0.50

ILED3 (ILED4 = ILED5 = 5mA)

-1.00

ILED5 (ILED4 = ILED3 = 5mA)

-1.50

2.5 3.0 3.5 4.0 4.5 5.0 5.5

INPUT VOLTAGE (V)

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