Low-Noise, Dual-Output, Regulated Charge Pump

for GaAsFET, LCD, and VCO Supplies

4

_______________________________________________________________________________________

20

0

-40

-15

35

85

SHDN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

60

10

4

2

8

6

10

12

14

16

18

90

0

0.1

1

10

100

EFFICIENCY vs. LOAD CURRENT

(NOUT ONLY LOADED)

10

20

30

40

50

60

70

80

LOAD CURRENT (mA)

0.40

-0.05

-40

-15

35

85

SHDN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

60

10

0.05

0

0.15

0.10

0.20

0.25

0.30

0.35

115

10

2.5

3.0

4.0

6.0

CHARGE-PUMP FREQUENCY

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

4.5

3.5

5.0

5.5

40

25

70

55

85

100

SYNC = GND

SYNC = IN

120

0

-55 -35

5

125

CHARGE-PUMP FREQUENCY

vs. TEMPERATURE

TEMPERATURE (°C)

25

-15

45

85

65

105

40

20

80

60

100

SYNC = GND

SYNC = IN

1.8

0

2.5

3.0

4.0

6.0

SUPPLY CURRENT

vs. SUPPLY VOLTAGE (NO LOAD)

SUPPLY VOLTAGE (V)

5.0

4.5

5.5

3.5

0.4

0.2

0.8

0.6

1.0

1.2

1.4

1.6

f = 25kHz

f = 100kHz

90

0

0.1

1

10

100

EFFICIENCY vs. OUTPUT CURRENT

(POUT ONLY LOADED)

10

20

30

40

50

60

70

80

OUTPUT CURRENT (mA)

90

0

0.1

1

10

100

EFFICIENCY vs. OUTPUT CURRENT

LOAD BETWEEN POUT AND NOUT

10

20

30

40

50

60

70

80

OUTPUT CURRENT (mA)

____________________________Typical Operating Characteristics (continued)

4

0

0

40

120

320

SUPPLY CURRENT

vs. SYNC FREQUENCY

3

SYNC FREQUENCY (kHz)

160

80

200 240 280

1

2