__________________________________________Typical Operating Characteristics
(V
IN
= 5.0V, capacitor values in Table 1, T
A
= +25°C, unless otherwise noted.)
10
-10
05
10
20 25 40
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
-8
6
8
MAX864-07
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
15 30 35
-2
4
2
0
-4
-6
V- LOADED
C1–C4 = 1µF
V
IN
= 4.75V
FC1 = 1
FC0 = 1 (185kHz)
V- LOADED
V+ LOADED
V+ LOADED
BOTH V+ AND
V- LOADED EQUALLY
100
0
01052035
EFFICIENCY vs. OUTPUT CURRENT
@ 7kHz PUMP FREQUENCY
20
80
V+
V-
V-
90
MAX864-01
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (%)
15 25 30
70
40
60
50
30
10
V
IN
= 5.0V
V
IN
= 3.3V
C1–C4 = 33µF
FC1 = 0, FC0 = 0
V+
0
01052035
EFFICIENCY vs. OUTPUT CURRENT
@ 33kHz PUMP FREQUENCY
20
80
V+
V-
V-
90
MAX864-02
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (%)
15 25 30
70
40
60
50
30
10
V
IN
= 5.0V
V
IN
= 3.3V
V+
C1–C4 = 6.8µF
FC1 = 0, FC0 = 1
0
01052035
EFFICIENCY vs. OUTPUT CURRENT
@ 100kHz PUMP FREQUENCY
20
80
V+
V-
V-
MAX864-03
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (%)
15 25 30
70
40
60
50
30
10
V
IN
= 5.0V
V+
V
IN
= 3.3V
C1–C4 = 2.2µF
FC1 = 0, FC0 = 0
0
01052035
EFFICIENCY vs. OUTPUT CURRENT
@ 185kHz PUMP FREQUENCY
20
80
V+
V-
V-
MAX864-04
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (%)
15 25 30
70
40
60
50
30
10
V
IN
= 5.0V
V+
V
IN
= 3.3V
C1–C4 = 1µF
FC1 = 1, FC0 = 1
160
40
1.0 2.0 4.0 6.0
OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
60
140
MAX864-05
SUPPLY VOLTAGE (V)
OUTPUT RESISTANCE (Ω)
3.0 5.0
100
120
80
R
OUT-
FC1 = 1, FC0 = 1
(185kHz @ 5V)
R
OUT+
140
35
-55
-35
-15 45 65 125
OUTPUT RESISTANCE
vs. TEMPERATURE
50
125
MAX864-06
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
5 25 85 105
80
110
95
65
V-, V
IN
= 3.0V
V-, V
IN
= 4.5V
V+, V
IN
= 3.0V
V+, V
IN
= 4.5V
4.5
0
0 5 10 15 3025 35 50
OUTPUT CURRENT vs. PUMP CAPACITANCE
(V
IN
= 1.9V, V+ + V- = 6V)
0.5
3.5
4.0
MAX864-08
PUMP CAPACITANCE (µF)
OUTPUT CURRENT FROM V+ TO V- (mA)
20 40 45
2.0
3.0
2.5
1.5
1.0
f = 7kHz
C1 = C2 = C3 = C4
f = 33kHz
f = 185kHz
f = 100kHz
9
0
0 5 10 15 3025 35 50
OUTPUT CURRENT vs. PUMP CAPACITANCE
(V
IN
= 3.15V, V+ + V- = 10V)
1
7
8
MAX864-09
PUMP CAPACITANCE (µF)
OUTPUT CURRENT FROM V+ TO V- (mA)
20 40 45
4
6
5
3
2
C1 = C2 = C3 = C4
f = 185kHz
f = 7kHz
f = 33kHz
f = 100kHz
MAX864
Dual-Output Charge Pump with Shutdown
_______________________________________________________________________________________
3
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