MAX8821 datasheet(11/29 Pages) MAXIM

Part #	MAX8821

Description	White LED Charge Pump with Mono Class D Audio Amp and Dual LDO

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Manufacturer	MAXIM [Maxim Integrated Products]

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White LED Charge Pump with Mono Class D

Audio Amp and Dual LDO

______________________________________________________________________________________

11

WIDEBAND OUTPUT SPECTRUM

FIXED-FREQUENCY MODE

FREQUENCY (MHz)

10

1

0.1

0.01

-120

-100

-80

-60

-40

-20

0

-140

0.001

100

RL = 8

Ω

INPUTS AC GROUNDED

0

0.5

1.5

1.0

2.0

2.5

2.7

3.5

3.1

3.9

4.3

4.7

5.1

5.5

OUTPUT POWER

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

THD+N = 10%

THD+N = 1%

RL = 8

Ω

0

1.0

0.5

2.0

1.5

3.0

2.5

3.5

2.7

3.5

3.9

3.1

4.3

4.7

5.1

5.5

OUTPUT POWER

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

THD+N = 10%

THD+N = 1%

RL = 4

Ω

50

65

60

55

75

70

95

90

85

80

100

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

EFFICIENCY

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

RL = 8

Ω

RL = 4

Ω

0

30

20

10

40

50

60

70

80

90

100

0

0.5

1.0

1.5

2.0

EFFICIENCY vs. OUTPUT POWER

OUTPUT POWER (W)

RL = 8

Ω

RL = 4

Ω

VIN = 3.6V

0

30

20

10

40

50

60

70

80

90

100

01234

EFFICIENCY

vs. OUTPUT POWER

OUTPUT POWER (W)

RL = 8

Ω

RL = 4

Ω

VIN = 5V

Typical Operating Characteristics (continued)

(VIN1 = VIN2 = VIN3 = VDD = 3.6V, VAGND = VPGND1 = VPGND2 = 0V, circuit of Figure 2, TA = +25°C, unless otherwise noted.)

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