Typical operating characteristics – Rainbow Electronics MAX861 User Manual
Page 4
MAX860/MAX861
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(All curves generated using the inverter circuit shown in the
Typical Operating Circuits
with LV = GND and T
A
= +25°C, unless other-
wise noted. Test results also valid for doubler mode with LV = OUT and T
A
= +25°C. All capacitor values used are those recom-
mended in Table 3, unless otherwise noted. The output resistance curves represent the resistance of the device itself, which is R
O
in
the equation for R
OUT
shown in the
Capacitor Selection
section.)
0.7
0
0
OUTPUT VOLTAGE DROP FROM
SUPPLY VOLTAGE vs. LOAD CURRENT
0.8
MAX860-01
LOAD CURRENT (mA)
V
OUT
DROP (V)
30
0.4
0.2
10
20
50
0.6
40
0.1
0.3
0.5
V
DD
= +1.5V
V
DD
= +2.5V
V
DD
= +3.5V
V
DD
= +4.5V, +5.0V
V
DD
= +5.5V
ALL FREQUENCIES
2
-14
1.5 2.0
3.0
4.0
OSCILLATOR FREQUENCY vs.
SUPPLY VOLTAGE
-6
0
MAX860-02
SUPPLY VOLTAGE (V)
PERCENTAGE FREQUENCY CHANGE (
%
)
(FROM FREQUENCY MEASURED WITH V
DD
= +5V)
2.5
3.5
-2
-4
4.5 5.0 5.5
-8
-10
-12
ALL FREQUENCIES,
LV CONNECTED TO GND
(INVERTER) OR OUT (DOUBLER)
1.0
20
0
0
1
3
5
OUTPUT SOURCE RESISTANCE (R
O
) vs.
SUPPLY VOLTAGE
4
16
MAX860-03
SUPPLY VOLTAGE (V)
OUTPUT SOURCE RESISTANCE (
Ω
)
2
4
12
8
2
6
10
14
18
ALL FREQUENCIES
32
0
-60
-20
40
140
OUTPUT SOURCE RESISTANCE (R
O
) vs.
TEMPERATURE
8
28
MAX860-04
TEMPERATURE (°C)
OUTPUT SOURCE RESISTANCE (
Ω
)
20
100
24
16
-40
0
60 80
120
20
12
4
V
DD
= +3V
V
DD
= +5V
V
DD
= +1.5V
ALL FREQUENCIES
0
0
MAX861 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX860-07
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
100
200
300
500
1
2
3
4
5
6
400
DOUBLER, LV = OUT
INVERTER, LV = GND
FC = V
DD
100
0
0.01
1
100
MAX860
EFFICIENCY vs. LOAD CURRENT
20
MAX860-05
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
10
30
50
70
90
0.1
10
INVERTER
FC = V
DD
V
DD
= +1.5V
V
DD
= +3V
V
DD
= +5V
0
0
MAX860 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX860-06
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
100
200
300
500
1
2
3
4
5
6
400
DOUBLER, LV = OUT
INVERTER, LV = GND
(V
DD
> 3V)
FC = V
DD
70
0
0.33
MAX860 OUTPUT CURRENT vs. CAPACITANCE
HIGH-FREQUENCY MODE
MAX860-08
CAPACITANCE (
µ
F)
OUTPUT CURRENT (mA)
4.7
40
20
1
2.2
22
60
10
10
30
50
V
IN
= +4.5V, V
OUT
= -3.5V
V
IN
= +4.5V, V
OUT
= -4V
V
IN
= +3V, V
OUT
= -2.4V
V
IN
= +3V, V
OUT
= -2.7V
f
OSC
= 130kHz
FC = OUT
LV = GND
INVERTER MODE
80
70
0
0.33
MAX860 OUTPUT CURRENT vs. CAPACITANCE
MEDIUM-FREQUENCY MODE
MAX860-09
CAPACITANCE (
µ
F)
OUTPUT CURRENT (mA)
4.7
40
20
1
2.2
22
60
10
10
30
50
V
IN
= +4.5V, V
OUT
= -3.5V
V
IN
= +3V, V
OUT
= -2.4V
V
IN
= +4.5V, V
OUT
= -4V
V
IN
= +3V, V
OUT
= -2.7V
f
OSC
= 50kHz
FC = GND
LV = GND
INVERTER MODE