Triple-Output Charge Pump Regulator
Typical Characteristics
V
IN
= 3.3V, V
OUT
= 5V, V
POS
= 12.5V, V
NEG
= -7.8V, C
IN
= C
FLY
= 1µF, C
OUT
= 4.7µF; T
A
= 25°C, unless otherwise noted.
Reference Voltage vs. Temperature
Positive Output Voltage (V)
1.22
AAT2820
Positive Charge Pump Output
Voltage vs. Temperature
(No Load at V
NEG
and V
OUT
)
12.70
12.65
12.60
12.55
12.50
12.45
12.40
12.35
12.30
-40
-20
0
20
40
60
80
100
Reference Voltage (V)
V
POS
= 12.5V
I
POS
= 5mA
I
POS
= 15mA
1.21
1.20
1.19
1.18
1.17
-40
-20
0
20
40
60
80
100
Temperature (°C)
°
°
Temperature (°C)
Positive Charge Pump Output
Voltage vs. Output Current
(No Load at V
NEG
and V
OUT
)
Positive Output Voltage (V)
12.5
12.4
12.3
12.2
Positive Charge Pump Efficiency
vs. Output Current
(No Load at V
NEG
and V
OUT
)
80
Efficiency (%)
V
IN
= 4.2V
70
60
50
40
30
20
V
IN
= 2.7V
V
IN
= 3.0V
V
IN
= 3.3V
V
IN
= 4.2V
V
IN
= 2.7V
12.1
12
V
IN
= 3.3V
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Output Current (mA)
Output Current (mA)
Negative Charge Pump Output
Voltage vs. Temperature
(No Load at V
POS
and V
OUT
)
Negative Charge Pump Output
vs. Output Current
(No Load at V
POS
and V
OUT
)
-7.6
Negative Output Voltage (V)
-7.65
-7.70
-7.75
-7.80
-7.85
-7.90
-7.95
-8.00
-8.05
-8.10
-8.15
-40
-20
0
20
40
60
80
100
V
NEG
= -7.8V
Output Voltage (V)
-7.5
-7.4
-7.3
-7.4
-7.1
0
5
10
15
V
IN
= 2.7V
V
IN
= 3.3V
I
NEG
= 15mA
I
NEG
= 5mA
V
IN
= 4.2V
20
25
30
Temperature (°C)
°
Output Current (mA)
6
2820.2006.04.1.4
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
