Rainbow Electronics MAX865 - Manual (Page 3)

MAX865
Compact, Dual-Output Charge Pump
_______________________________________________________________________________________ 3
10
8
-10
0 2 6 14
OUTPUT VOLTAGE vs.
OUTPUT CURRENT
-4
-6
-8
6
4
MAX865-04
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE, V+, V- (V)
4 8 10
0
-2
2
12
V-
C1 = C2 = C3 = C4 = 3.3 µ F
V IN = 4.75V
V-
BOTH V+ AND
V- LOADED EQUALLY
V+
V+
400
350
0
0 20 25 50
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
100
50
300
MAX865-05
PUMP CAPACITANCE ( µ F)
OUTPUT VOLTAGE RIPPLE (mVp-p)
5 10 15 30 35
200
150
250
40 45
C1 = C2 = C3 = C4
A
B
D
E
F
C
A: V+, IN = 4.75V, V+ +
|
V-
|
= 16V
B: V+, IN = 3.15V, V+ +
|
V-
|
= 10V
C: V+, IN = 1.90V, V+ +
|
V-
|
= 6V
D: V-, IN = 4.75V, V+ +
|
V-
|
= 16V
E: V-, IN = 3.15V, V+ +
|
V-
|
= 10V
F: V-, IN = 1.90V, V+ +
|
V-
|
= 6V
7
6
0
0 20 25 50
OUTPUT CURRENT
vs. PUMP CAPACITANCE
2
1
5
MAX865-06
PUMP CAPACITANCE ( µ F)
OUTPUT CURRENT, V+ TO V- (mA)
5 10 15 30 35
3
4
40 45
V IN = 4.75V, V+ +
|
V-
|
= 16V
C1 = C2 = C3 = C4
V IN = 3.15V, V+ +
|
V-
|
= 10V
V IN = 1.90V, V+ +
|
V-
|
= 6V
1000
900
0
2.0 3.5 4.0 6.0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
300
200
100
800
700
MAX865-07
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ A)
2.5 3.0 4.5
400
600
500
5.0 5.5
C1 = C2 = C3 = C4 = 3.3 µ F
300
0
-55 5 25 125
OUTPUT RESISTANCE
vs. TEMPERATURE
100
50
250
MAX865-08
TEMPERATURE (°C)
OUTPUT RESISTANCE (
Ω
)
-35 -15 45 65
200
150
85 105
C1 = C2 = C3 = C4 = 3.3 µ F
V-, V IN = 3.3V
V+, V IN = 3.3V
V+, V IN = 5.0V
V-, V IN = 5.0V
27
15
-40 0 20 100
PUMP FREQUENCY
vs. TEMPERATURE
19
17
25
MAX865-09
TEMPERATURE (°C)
PUMP FREQUENCY (kHz)
-20 40
23
21
60 80
C1 = C2 = C3 = C4 = 3.3 µ F
V IN = 5.0V
V IN = 3.3V
V IN = 2.0V
250
0
2.0 3.0 3.5 6.0
OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
50
200
MAX865-10
SUPPLY VOLTAGE (V)
OUTPUT RESISTANCE (
Ω
)
2.5 4.0 4.5
150
100
5.0 5.5
C1 = C2 = C3 = C4 = 3.3 µ F
V-
V+
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, V IN = 5V, T A = +25°C, unless otherwise noted.)