MAX864 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX864 Datasheet PDF : 12 Pages
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Dual-Output Charge Pump with Shutdown
__________________________________________Typical Operating Characteristics
(VIN = 5.0V, capacitor values in Table 1, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
@ 7kHz PUMP FREQUENCY
100
VIN = 5.0V
90
80
V+
70
V+
60
VIN = 3.3V
V-
V-
50
40
30
C1–C4 = 33µF
FC1 = 0, FC0 = 0
20
10
0
0
5 10 15 20 25 30 35
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
@ 185kHz PUMP FREQUENCY
80
VIN = 3.3V
V+
70
V+
60
50
VIN = 5.0V
V-
V-
40
30
C1–C4 = 1µF
20
FC1 = 1, FC0 = 1
10
0
0
5 10 15 20 25 30 35
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
10
8
V+ LOADED
6
V- LOADED
4
2
BOTH V+ AND
C1–C4 = 1µF
VIN = 4.75V
0 V- LOADED EQUALLY FC1 = 1
FC0 = 1 (185kHz)
-2
-4
-6
V- LOADED
-8
V+ LOADED
-10
0 5 10 15 20 25 30 35 40
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
@ 33kHz PUMP FREQUENCY
90
VIN = 3.3V
80
70
VIN = 5.0V
60
V+
V+
V-
V-
50
40
30
C1–C4 = 6.8µF
FC1 = 0, FC0 = 1
20
10
0
0
5 10 15 20 25 30 35
OUTPUT CURRENT (mA)
OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
160
FC1 = 1, FC0 = 1
140
(185kHz @ 5V)
120
ROUT-
100
80
ROUT+
60
40
1.0 2.0 3.0 4.0 5.0 6.0
SUPPLY VOLTAGE (V)
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 1.9V, V+ + V- = 6V)
4.5
f = 33kHz
4.0
3.5
3.0
f = 185kHz f = 100kHz
f = 7kHz
2.5
2.0
1.5
1.0
0.5
C1 = C2 = C3 = C4
0
0 5 10 15 20 25 30 35 40 45 50
PUMP CAPACITANCE (µF)
EFFICIENCY vs. OUTPUT CURRENT
@ 100kHz PUMP FREQUENCY
80
VIN = 3.3V
70
V+
V+
60
VIN = 5.0V
V-
V-
50
40
30
C1–C4 = 2.2µF
FC1 = 0, FC0 = 0
20
10
0
0
5 10 15 20 25 30 35
OUTPUT CURRENT (mA)
OUTPUT RESISTANCE
vs. TEMPERATURE
140
125
V-, VIN = 3.0V
110
V-, VIN = 4.5V
95
V+, VIN = 3.0V
80
65
50
V+, VIN = 4.5V
35
-55 -35 -15 5 25 45 65 85 105 125
TEMPERATURE (°C)
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 3.15V, V+ + V- = 10V)
9
8
7
f = 100kHz
f = 33kHz
6
f = 185kHz
5
4
f = 7kHz
3
2
1
C1 = C2 = C3 = C4
0
0 5 10 15 20 25 30 35 40 45 50
PUMP CAPACITANCE (µF)
_______________________________________________________________________________________ 3
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