Compact, Dual-Output Charge Pump

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3

10

8

-10

0

2

6

14

OUTPUT VOLTAGE vs.

OUTPUT CURRENT

-4

-6

-8

6

4

OUTPUT CURRENT (mA)

4

8

10

0

-2

2

12

V-

C1 = C2 = C3 = C4 = 3.3

µF

V-

BOTH V+ AND

V- LOADED EQUALLY

V+

V+

400

350

0

0

20 25

50

OUTPUT VOLTAGE RIPPLE

vs. PUMP CAPACITANCE

100

50

300

PUMP CAPACITANCE (

µF)

5

10 15

30 35

200

150

250

40 45

C1 = C2 = C3 = C4

A

B

D

E

F

C

A: V+, IN = 4.75V, V+ + |V-| = 16V

B: V+, IN = 3.15V, V+ + |V-| = 10V

C: V+, IN = 1.90V, V+ + |V-| = 6V

D: V-, IN = 4.75V, V+ + |V-| = 16V

E: V-, IN = 3.15V, V+ + |V-| = 10V

F: V-, IN = 1.90V, V+ + |V-| = 6V

7

6

0

0

20 25

50

OUTPUT CURRENT

vs. PUMP CAPACITANCE

2

1

5

PUMP CAPACITANCE (

µF)

5

10 15

30 35

3

4

40 45

C1 = C2 = C3 = C4

1000

900

0

2.0

3.5

4.0

6.0

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

300

200

100

800

700

SUPPLY VOLTAGE (V)

2.5

3.0

4.5

400

600

500

5.0 5.5

C1 = C2 = C3 = C4 = 3.3

µF

300

0

-55

5

25

125

OUTPUT RESISTANCE

vs. TEMPERATURE

100

50

250

TEMPERATURE (°C)

-35 -15

45

65

200

150

85 105

C1 = C2 = C3 = C4 = 3.3

µF

27

15

-40

0

20

100

PUMP FREQUENCY

vs. TEMPERATURE

19

17

25

TEMPERATURE (°C)

-20

40

23

21

60

80

C1 = C2 = C3 = C4 = 3.3

µF

250

0

2.0

3.0

3.5

6.0

OUTPUT RESISTANCE

vs. SUPPLY VOLTAGE

50

200

SUPPLY VOLTAGE (V)

2.5

4.0

4.5

150

100

5.0

5.5

C1 = C2 = C3 = C4 = 3.3

µF

V-

V+

____________________________Typical Operating Characteristics (continued)