ADM660/ADM8660–Typical Performance Characteristics
3
100
IL = 10mA
2.5
SUPPLY CURRENT – mA
POWER EFFICIENCY – %
90
VOLTAGE DOUBLER
LV = OUT
IL = 1mA
2
80
70
60
1.5
IL = 50mA
1
LV = GND
0.5
LV = OPEN
0
1.5
50
IL = 80mA
40
30
3.5
5.5
SUPPLY VOLTAGE – Volts
7.5
1k
10k
100k
CHARGE-PUMP FREQUENCY – Hz
1M
Figure 1. Power Supply Current vs. Voltage
Figure 4. Efficiency vs. Charge-Pump Frequency
–3
100
3.5
3
EFFICIENCY
–3.4
OUTPUT VOLTAGE – Volts
80
SUPPLY CURRENT – mA
2.5
–3.8
60
EFFICIENCY – %
2
LV = GND
VOLTAGE DOUBLER
1.5
1
–4.2
V
OUT
–4.6
40
20
0.5
LV = GND
VOLTAGE INVERTER
–5
0
20
40
60
LOAD CURRENT – mA
80
0
100
0
1
100
10
CHARGE-PUMP FREQUENCY – kHz
1000
Figure 2. Output Voltage and Efficiency vs. Load Current
Figure 5. Power Supply Current vs. Charge-Pump
Frequency
120
V+ = +6.5V
V+ = +5.5V
V+ = +4.5V
1.6
OUTPUT VOLTAGE DROP
FROM SUPPLY VOLTAGE – Volts
100
1.2
V+ = +3.5V
EFFICIENCY – %
80
V+ = +2.5V
0.8
V+ = +1.5V
V+ = +5.5V
0.4
V+ = +4.5V
V+ = +3.5V
60
V+ = +1.5V
40
V+ = +2.5V
20
0
0
20
40
60
LOAD CURRENT – mA
80
100
0
0
20
40
60
LOAD CURRENT – mA
80
100
Figure 3. Output Voltage Drop vs. Load Current
Figure 6. Power Efficiency vs. Load Current
–4–
REV. A
AD [ ANALOG DEVICES ]
