SC70 Inverting Charge Pumps

with Shutdown

_______________________________________________________________________________________

7

Table 2. Capacitor Selection to Minimize

Output Resistance

Table 3. Capacitor Selection to Minimize

Capacitor Size

Table 1. Low-ESR Capacitor Manufacturers

PART

FREQUENCY

(kHz)

CAPACITOR

(µF)

TYPICAL

Ω)

MAX1852

50

4.7

15

MAX1853

200

1

15

PART

FREQUENCY

(kHz)

CAPACITOR

(µF)

TYPICAL

Ω)

MAX1852

50

3.3

20

MAX1853

200

0.68

20

714-960-6492

803-626-3123

603-224-1430

714-960-6492

803-626-3123

FAX

PHONE

803-946-0690

714-969-2491

603-224-1961

803-946-0690

714-969-2491

X7R

X7R

593D, 595D series

267 series

TPS series

SERIES

Matsuo

AVX

Sprague

Matsuo

AVX

MANUFACTURER

PRODUCTION

METHOD

Surface-Mount

Tantalum

Surface-Mount

Ceramic

MAX1852

MAX1853

4

3

1

C2

C1

5

2

6

C4

D1

D1, D2 = 1N4148

C3

D2

SHDN

Figure 6. Combined Doubler and Inverter

MAX1852

MAX1853

2

1

GND

OUT

V+

Figure 7. Heavy Load Connected to a Positive Supply

TRANSISTOR COUNT: 252

MAX1852

MAX1853

MAX1852

MAX1853

4

1

C2

4

C1

C1

5

5

22

6

3

3

6

1

NUMBER OF DEVICES

…

…

SHDN

Figure 5. Paralleling MAX1852/MAX1853s to Reduce Output

Resistance

Chip Information

MAX1852

MAX1853

MAX1852

MAX1853

4

1

C2

4

C1

C2

SHDN

C1

55

22

6

33

6

1

…

…

Figure 4. Cascading MAX1852/MAX1853s to Increase Output

Voltage