CMOS Monolithic Voltage Converter
__________________________________________Typical Operating Characteristics
All curves are generated using the test circuit of Figure 1
with V+ =5V, LV = GND, FC = open, and T
A
= +25°C,
unless otherwise noted. The charge-pump frequency is
one-half the oscillator frequency. Test results are also
valid for doubler mode with GND = +5V, LV = OUT, and
OUT = 0V, unless otherwise noted; however, the input
voltage is restricted to +2.5V to +5.5V.
MAX660
I
S
V+
1
2
3
4
FC
CAP+
V+
8
V+
(+5V )
OSC 7
6
C1
GND
MAX660
LV
CAP-
OUT 5
I
L
R
L
V
OUT
C2
Figure 1. MAX660 Test Circuit
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX660-1
SUPPLY CURRENT
vs. OSCILLATOR FREQUENCY
MAX660-4
OUTPUT VOLTAGE AND EFFICIENCY
vs. LOAD CURRENT, V+ = 5V
-3.0
MAX660
-3.4
ICL7660
EFF.
V
OUT
ICL7660
-4.6
MAX660
68
92
EFFICIENCY (%)
100
MAX660-6A
400
350
SUPPLY CURRENT (µA)
300
250
200
150
100
50
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
LV = OPEN
LV = GND
LV = OUT
10
SUPPLY CURRENT (mA)
1
OUTPUT VOLTAGE (V)
-3.8
84
-4.2
76
0.1
0.01
5.5
0.1
1
10
100
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
-5.0
0
20
40
60
80
LOAD CURRENT (mA)
60
100
EFFICIENCY vs. LOAD CURRENT
MAX660-2
OUTPUT VOLTAGE DROP
vs. LOAD CURRENT
OUTPUT VOLTAGE DROP FROM SUPPLY (V)
MAX660-3
OUTPUT VOLTAGE
vs. OSCILLATOR FREQUENCY
I
LOAD
= 1mA
-4.5
I
LOAD
= 10mA
MAX660-5
100
V+ = 5.5V
92
EFFICIENCY (%)
1.2
1.0
0.8
0.6
0.4
V+ = 4.5V
0.2
V+ = 5.5V
0
V+ = 1.5V
V+ = 2.5V
-5.0
84
V+ = 3.5V
76
V+ = 1.5V
V+ = 4.5V
OUTPUT VOLTAGE (V)
V+ = 3.5V
-4.0
I
LOAD
= 80mA
-3.5
68
V+ = 2.5V
60
0
20
40
60
80
100
LOAD CURRENT (mA)
-3.0
0
10 20
30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0.1
1
10
100
OSCILLATOR FREQUENCY (kHz)
_________________________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
