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MAX8822

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.)

LINE-TRANSIENT RESPONSE

(NO MODE CHANGE)

MAX8822 toc16

VIN

4.2V

3.7V

500mV/div

(AC-COUPLED)

IIN

100mA/div

0mA

ILED_TOTAL

1ms/div

100mA/div

0mA

ILED_ = 24mA

LDO1 LOAD TRANSIENT

MAX8822 toc18

LINE-TRANSIENT RESPONSE

(MODE CHANGE)

MAX8822 toc17

VIN

3.8V

3.4V

500mV/div

(AC-COUPLED)

IIN

100mA/div

0mA

ILED_TOTAL

1ms/div

100mA/div

0mA

ILED_ = 24mA

LDO2 LOAD TRANSIENT

MAX8822 toc19

VLDO1

ILDO1

20mV/div

(AC-COUPLED)

150mA

50mA/div

20μs/div

10mA

VLDO1 = 2.8V

VLDO2

ILDO2

20mV/div

(AC-COUPLED)

150mA

50mA/div

20μs/div

10mA

VLDO2 = 1.8V

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

80

IOUT = 10mA

70

COUT = 1μF

60

50

40

30

20

10

0

0.01 0.1

1

10 100 1000

FREQUENCY (kHz)

LDO OUTPUT NOISE

50μV/div

VLDO = 2.8V, ILDO = 28mA

400μs/div

6 _______________________________________________________________________________________

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