Typical operating characteristics – Rainbow Electronics MAX1730 User Manual
Page 4
MAX1730
50mA Regulated Step-Down Charge Pump
for 1.8V or 1.9V Logic
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
IN
= +3.6V, FB = GND, SHDN = IN, C
IN
= 1µF, C1 = C2 = 0.22µF, C
OUT
= 4.7µF, T
A
= +25°C, unless otherwise noted.)
0.1
10
1
100
1000
EFFICIENCY
vs. OUTPUT CURRENT
MAX1730 TOC01
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
0
10
30
20
50
40
V
IN
= 5.0V
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 3.3V
50
65
60
55
70
75
80
85
90
95
100
2.5
3.5
3.0
4.0
4.5
5.0
5.5
EFFICIENCY vs. INPUT VOLTAGE
MAX1730 TOC02
INPUT VOLTAGE (V)
EFFICIENCY (%)
I
OUT
= 25mA
50
65
60
55
70
75
80
85
90
95
100
2.5
3.5
3.0
4.0
4.5
5.0
5.5
EFFICIENCY vs. INPUT VOLTAGE
MAX1730 TOC02
INPUT VOLTAGE (V)
EFFICIENCY (%)
I
OUT
= 50mA
0
20
10
40
30
60
50
70
2.0
3.0
3.5
2.5
4.0
4.5
5.0
5.5
INPUT CURRENT vs. INPUT VOLTAGE
MAX1730 TOC04
INPUT VOLTAGE (V)
INPUT CURRENT (
µ
A)
SHUTDOWN CURRENT
NO-LOAD
SUPPLY CURRENT
0.1
10
1
100
1000
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX1730 TOC05
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
1.85
1.75
1.77
1.79
1.83
1.81
V
IN
= 5.0V
V
IN
= 2.7V
V
IN
= 3.3V
0
0.4
0.2
0.8
0.6
1.2
1.4
1.6
1.8
1.0
2.0
0
2
3
1
4
5
6
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX1730 TOC06
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
I
OUT
= 0 to 50mA