4

_______________________________________________________________________________________

SC70 Inverting Charge Pumps

with Shutdown

50

53

52

51

55

54

59

58

57

56

60

-40

-20

0

20

40

60

80

MAX1852

CHARGE-PUMP FREQUENCY

vs. TEMPERATURE

TEMPERATURE (

°C)

200

210

205

215

225

220

230

-40

-20

0

20

40

60

80

MAX1853

CHARGE-PUMP FREQUENCY

vs. TEMPERATURE

TEMPERATURE (

°C)

20

120

70

170

220

270

2.0

3.5

4.0

2.5

3.0

4.5

5.0

5.5

CHARGE-PUMP FREQUENCY

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

MAX1853

MAX1852

-5.5

-4.5

-5.0

-3.5

-4.0

-2.5

-3.0

-2.0

2.0

3.0

3.5

2.5

4.0

4.5

5.0

5.5

MAX1852 AND MAX1853

OUTPUT VOLTAGE vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

2

µs/div

MAX1853

OUTPUT NOISE AND RIPPLE

20mV/div

C1 = C2 = 1

µF

0

100

50

200

150

300

250

350

0.2

2.2

1.2

3.2

4.2

0.7

2.7

1.7

3.7

4.7

OUTPUT VOLTAGE RIPPLE

vs. CAPACITANCE

CAPACITANCE (

µF)

MAX1853

C1 = C2

MAX1852

10

µs/div

MAX1852

OUTPUT NOISE AND RIPPLE

20mV/div

C1 = C2 = 4.7

µF

100

µs/div

MAX1852

STARTUP FROM SHUTDOWN

MAX1852/3 toc17

SHDN

0

0

2V/div

40

µs/div

MAX1853

STARTUP FROM SHUTDOWN

MAX1852/3 toc18

SHDN

0

0

2V/div

Typical Operating Characteristics (continued)