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MAX8847Z

High-Performance Negative Charge Pump for 6 White LEDs in 3mm x 3mm Thin QFN

Maxim Integrated 

MAX8847Y/MAX8847Z

High-Performance Negative Charge Pump

for 6 White LEDs in 3mm x 3mm Thin QFN

Typical Operating Characteristics (continued)

(VIN = 3.6V, VEN_ = VIN, circuit of Figure 1, TA = +25°C, unless otherwise noted.)

INPUT VOLTAGE RIPPLE (PEAK TO PEAK)

vs. INPUT VOLTAGE

30

20.8mA / LED

25

MAX8847Z

VIN FALLING

16.0mA / LED

20

6.4mA / LED

15

10

5 1.6mA/LED

LEDS HAVE

MISMATCHED VF

0

2.7 3.0 3.3 3.6 3.9 4.2

INPUT VOLTAGE (V)

LED CURRENT vs. TEMPERATURE

30

25

20

15

10

5

24mA / LED

0

-40 -15

10

35

60

85

TEMPERATURE (°C)

LED CURRENT MATCHING

vs. SUPPLY VOLTAGE

18.0

MAX8847Z

17.6 16mA/LED, VIN FALLING

17.2

16.8

16.4

16.0

15.6

15.2

14.8

14.4

14.0

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

SUPPLY VOLTAGE (V)

1x MODE OPERATING WAVEFORM

(VIN = 4V)

MAX8847Y toc12

VIN

50mV/div

AC-COUPLED

100mA /div

IIN

0A

ILED1

20mA /div

ALL LEDS ON 0A

24mA /LED

1µs/div

1.5x MODE OPERATING WAVEFORM

(VIN = 3V)

MAX8847Y toc13

100mV/div

VIN

AC-COUPLED

IIN

ILED1

Maxim Integrated

100mA /div

ALL LEDS ON

24mA / LED

1µs/div

0A

20mA /div

0A

STARTUP AND SHUTDOWN RESPONSE

(MAX8847Y)

MAX8847Y toc14

VENA / ENB

VIN

ENA = ENB

24mA / LED

2V/div

200mV/div

AC-COUPLED

100mA /div

IIN

0A

20mA /div

ILED1

0A

20ms/div

  5

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