–4–

SUPPLY VOLTAGE – Volts

3

0

1.5

7.5

3.5

5.5

2.5

2

1.5

1

0.5

VOLTAGE DOUBLER

LV = OUT

LV = GND

LV = OPEN

Figure 1. Power Supply Current vs. Voltage

LOAD CURRENT – mA

–3

–4.2

–5

–3.8

–4.6

–3.4

0

100

20

40

60

80

100

40

0

60

20

80

EFFICIENCY

Figure 2. Output Voltage and Efficiency vs. Load Current

LOAD CURRENT – mA

1.6

0

0.8

0.4

1.2

0

100

20

40

60

80

V+ = +2.5V

V+ = +1.5V

V+ = +3.5V

V+ = +5.5V

V+ = +4.5V

Figure 3. Output Voltage Drop vs. Load Current

ADM660/ADM8660–Typical Performance Characteristics

CHARGE-PUMP FREQUENCY – Hz

100

90

30

1k

1M

10k

100k

70

60

50

40

80

IL = 10mA

IL = 1mA

IL = 50mA

IL = 80mA

Figure 4. Efficiency vs. Charge-Pump Frequency

CHARGE-PUMP FREQUENCY – kHz

3.5

3

0

1

1000

10

100

2

1.5

1

0.5

2.5

LV = GND

VOLTAGE DOUBLER

LV = GND

VOLTAGE INVERTER

Figure 5. Power Supply Current vs. Charge-Pump

Frequency

LOAD CURRENT – mA

120

100

0

0

100

20

40

60

80

80

60

40

20

V+ = +5.5V

V+ = +4.5V

V+ = +6.5V

V+ = +1.5V

V+ = +2.5V

V+ = +3.5V

Figure 6. Power Efficiency vs. Load Current

REV. A