Typical operating characteristics, Electrical characteristics – Rainbow Electronics MAX1721 User Manual
Page 3
MAX1719/MAX1720/MAX1721
SOT23, Switched-Capacitor
Voltage Inverters with Shutdown
_______________________________________________________________________________________
3
-5
-4
-3
-2
-1
0
0
20 25
10 15
5
30 35 40 45 50
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX1720/21toc01
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
V
IN
= +1.5V
V
IN
= +2V
V
IN
= +3.3V
V
IN
= +5V
0
20
10
40
30
60
50
70
90
80
100
0
10 15 20
5
25 30 35
45
40
50
MAX1720
EFFICIENCY vs. OUTPUT CURRENT
MAX1720/21toc02
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= +1.5V
V
IN
= +3.3V
V
IN
= +2V
V
IN
= +5V
0
20
10
40
30
60
50
70
90
80
100
0
10 15 20
5
25 30 35
45
40
50
MAX1719/MAX1721
EFFICIENCY vs. OUTPUT CURRENT
MAX1720/21toc03
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= +1.5V
V
IN
= +2V
V
IN
= +3.3V
V
IN
= +5V
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= +5V, SHDN = GND (MAX1719), SHDN = IN (MAX1720/MAX1721), C1 = C2 = C3, T
A
= +25°C, unless other-
wise noted.)
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V, SHDN = GND (MAX1719), SHDN = IN (MAX1720/MAX1721), C1 = C2 = 10µF (MAX1720), C1 = C2 = 1µF
(MAX1719/MAX1721), circuit of Figure 1,
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 2)
V
IN (MIN)
≤
V
IN
≤
+2.5V
R
L
= 10k
Ω
+2.5V
≤
V
IN
≤
+5.5V
V
IN (MIN)
≤
V
IN
≤
+2.5V
+2.5V
≤
V
IN
≤
+5.5V
I
OUT
= 0
SHDN = IN (MAX1719), SHDN = GND
(MAX1720/MAX1721), OUT is internally
forced to GND in shutdown
MAX1719/MAX1720/MAX1721
I
OUT
= 10mA
CONDITIONS
0.2
V
0.6
V
IL
SHDN/ SHDN Input Logic Low
V
IN
- 0.2
V
2.0
V
IH
SHDN/ SHDN Input Logic High
Ω
12
R
O
,
SHDN
OUT to GND Shutdown
Resistance
65
Ω
R
O
Output Resistance (Note 1)
MAX1719/MAX1721
1.6
5.5
MAX1719/MAX1721
1.5
5.5
MAX1720
%
99
Voltage Conversion Efficiency
60
200
kHz
6
21
f
OSC
Oscillator Frequency
µA
100
I
CC
Quiescent Current
750
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
V
IN
Supply Voltage Range
MAX1720
Note 1:
Capacitor contribution (ESR component plus (1/f
OSC
)
·
C) is approximately 20% of output impedance.
Note 2:
All specifications from -40°C to +85°C are guaranteed by design, not production tested.
Continuous, long-term
25
mA
RMS
I
OUT
Output Current