MAX8822ETE 查看數據表（PDF） - Maxim Integrated

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MAX8822ETE

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN

Maxim Integrated 

Ultra-Efficient Negative Charge-Pump LED

Driver with Dual LDOs in 3mm x 3mm Thin QFN

Typical Operating Characteristics (continued)

(VIN = 3.6V, VEN_ = VIN, Circuit of Typical Operating Circuit, TA = +25°C, unless otherwise noted.)

17.0

16.8

16.6

16.4

16.2

16.0

15.8

15.6

15.4

15.2

15.0

2.7

LED CURRENT MATCHING

vs. SUPPLY VOLTAGE

16mA/LED, VIN FALLING

3.1 3.5 3.9 4.3 4.7 5.1 5.5

SUPPLY VOLTAGE (V)

TYPICAL OPERATING WAVEFORMS

(CHARGE PUMP INACTIVE)

MAX8822 toc11

VIN

10mV/div

(AC-COUPLED)

IIN

100mA (AC-COUPLED)

10mA/div

ILED1

24mA (AC-COUPLED)

10mA/div

4 LEDs, 24mA/LED,

VIN = 3.8V

400ns/div

TYPICAL OPERATING WAVEFORMS

(CHARGE PUMP ACTIVE)

MAX8822 toc12

VIN

10mV/div

(AC-COUPLED)

VENLED

VIN

STARTUP AND SHUTDOWN

MAX8822 toc13

5V/div

0V

24mV/div

(AC-COUPLED)

IIN

100mA (AC-COUPLED)

10mA/div

IIN

ILED1

24mA (AC-COUPLED)

10mA/div

4 LEDs, 24mA/LED,

VIN = 3.2V

ILED_TOTAL

400ns/div

1ms/div

ILED_ = 24mA

100mA/div

0A

100mA/div

0A

VENLED

ILED1

SERIAL-PULSE CONTROL

DIMMING RESPONSE

MAX8822 toc14

5V/div

7 PULSES 0V

24mA

14.4mA 10mA/div

0A

IIN

50mA/div

1ms/div

4 LEDs

0A

VENLDO

ILDO2

ILDO1

SERIAL-PULSE CONTROL LDO

VOLTAGE PROGRAMMING

MAX8822 toc15

0

5V/div

8 PULSES

1.8V

1V/div

0V

3.3V

2V/div

0V

ILDO1 = ILDO2 = 100mA

400μs/div

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