(V+ = 5V; CBYPASS = 0.1μF; C1 = C2 = 10μF; LV = open; OSC = open; TA = +25°C; unless otherwise noted.)

Typical Operating Characteristics

OUTPUT VOLTAGE AND OUTPUT RIPPLE

vs. LOAD CURRENT

LOAD CURRENT (mA)

9

8

7

6

5

4

3

2

1

-0.5

-1.0

-1.5

-2.0

0

100

50

200

150

300

250

400

350

0

0

10

OUTPUT

VOLTAGE

V+ = 2V

LV = GND

OUTPUT RIPPLE

A: MAX1044 WITH

BOOST = V+

B: ICL7660

C: MAX1044 WITH

BOOST = OPEN

A

B

C

EFFICIENCY AND SUPPLY CURRENT

vs. LOAD CURRENT

LOAD CURRENT (mA)

7 8 9

6

4 5

2 3

1

100

10

9

8

7

6

5

4

3

2

1

0

0

0

10

10

40

50

60

70

80

90

30

20

SUPPLY CURRENT

EFFICIENCY

V+ = 2V

LV = GND

OUTPUT VOLTAGE AND OUTPUT RIPPLE

vs. LOAD CURRENT

LOAD CURRENT (mA)

35

30

20 25

10 15

5

-5.0

800

720

640

560

480

400

320

240

160

80

0

0

0

40

-0.5

-2.0

-2.5

-3.0

-3.5

-4.0

-4.5

-1.5

-1.0

OUTPUT VOLTAGE

OUTPUT RIPPLE

V+ = 5V

LV = OPEN

A

A

B

C

B

C

A: MAX1044 WITH

BOOST = V+

B: ICL7660

C: MAX1044 WITH

BOOST = OPEN

EFFICIENCY AND SUPPLY CURRENT

vs. LOAD CURRENT

LOAD CURRENT (mA)

35

30

20 25

10 15

5

100

50

45

40

35

30

25

20

15

10

5

0

0

0

40

10

40

50

60

70

80

90

30

20

V+ = 5V

LV = OPEN

EFFICIENCY

A: MAX1044 WITH

BOOST = V+

B: ICL7660

C: MAX1044 WITH

BOOST = OPEN

SUPPLY CURRENT

B

C

A

OUTPUT VOLTAGE AND OUTPUT RIPPLE

vs. LOAD CURRENT

LOAD CURRENT (mA)

35

30

20 25

10 15

5

-10

700

630

560

490

420

350

280

210

140

70

0

0

0

40

-1

-4

-5

-6

-7

-8

-9

-3

-2

V+ = 10V

LV = OPEN

OUTPUT

RIPPLE

A

B

A: MAX1044 WITH

BOOST = V+

B: ICL7660

C: MAX1044 WITH

BOOST = OPEN

C

B

C

A

OUTPUT

VOLTAGE

EFFICIENCY AND SUPPLY CURRENT

vs. LOAD CURRENT

LOAD CURRENT (mA)

35

30

20

25

10

15

5

100

50

45

40

35

30

25

20

15

10

5

0

0

0

40

10

40

50

60

70

80

90

30

20

V+ = 10V

LV = OPEN

A: MAX1044 WITH

BOOST = V+

B: ICL7660

C: MAX1044 WITH

BOOST = OPEN

SUPPLY CURRENT

B, C

EFFICIENCY

A

MAX1044/ICL7660

Switched-Capacitor Voltage Converters

Maxim Integrated │ 3

www.maximintegrated.com