Typical operating characteristics – Rainbow Electronics MAX1673 User Manual
Page 4
MAX1673
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
4
_______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= +5V, C
FLY
= 2.2µF, C
OUT
= 22µF, T
A
= +25°C, unless otherwise noted.)
0
40
20
80
60
120
100
140
0
50
75
25
100
125
150
OUTPUT RIPPLE
vs. LOAD CURRENT (LIN MODE)
MAX1673 RTOC01
LOAD CURRENT (mA)
PEAK-TO-PEAK RIPPLE (mV)
C
OUT
= 10
µ
F
C
FLY
=
C
OUT
10
C
OUT
= 22
µ
F
C
OUT
= 47
µ
F
0
50
150
100
200
250
0
50
25
75
100
125
150
OUTPUT RIPPLE
vs. LOAD CURRENT (SKIP MODE)
MAX1673 TOC02
LOAD CURRENT (mA)
PEAK-TO-PEAK RIPPLE (mV)
C
OUT
= 10
µ
F
C
OUT
= 22
µ
F
C
OUT
= 47
µ
F
C
FLY
=
C
OUT
10
-2.98
-3.01
-3.00
-2.99
-3.02
-3.03
-3.04
-3.05
-3.06
-3.07
-3.08
0
50
25
75
100
125
150
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1673 TOC03
LOAD CURRENT (mA)
V
OUT
(V)
LIN MODE
SKIP MODE
0
30
20
10
50
40
90
80
70
60
100
0
20
40
60
80
100
120
140
EFFICIENCY vs. LOAD CURRENT
(SKIP MODE)
MAX1673 TOC04
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 3.5V
V
IN
= 4V
V
IN
= 5V
CIRCUIT OF FIGURE 4
V
REF
≠
V
IN
0
4
2
8
6
10
12
T
A
= +25°C
2
4
3
5
6
DROPOUT OUTPUT RESISTANCE
vs. INPUT VOLTAGE
MAX1673 TOC07
V
IN
(V)
R
DROPOUT
(
Ω
)
T
A
= +85°C
T
A
= -40°C
0
20
10
50
40
30
80
70
60
90
0
40
60
20
80
100
120
140
EFFICIENCY vs. LOAD CURRENT
(LIN MODE)
MAX1673 TOC05
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 4V
V
IN
= 4.5V
V
IN
= 5V
CIRCUIT OF FIGURE 4
V
REF
≠
V
IN
30
50
40
70
60
80
90
3.5
4.5
4.0
5.0
5.5
6.0
EFFICIENCY vs. INPUT VOLTAGE
MAX1673 TOC06
V
IN
(V)
EFFICIENCY (%)
SKIP MODE
LIN MODE
100mA LOAD
V
OUT
= -3V
CIRCUIT OF FIGURE 4
V
REF
≠
V
IN
0
4
2
8
6
10
12
2
4
3
5
6
QUIESCENT CURRENT vs. INPUT VOLTAGE
(LIN MODE)
MAX1673 TOC08
V
IN
(V)
QUIESCENT CURRENT (mA)
DOES NOT INCLUDE BIAS CURRENT
FOR RESISTOR DIVIDER
V
REF
≠
V
IN
CIRCUIT OF FIGURE 4
0
20
15
10
5
35
30
25
40
45
2
4
3
5
6
QUIESCENT CURRENT vs. INPUT VOLTAGE
(SKIP MODE)
MAX1673 TOC09
V
IN
(V)
QUIESCENT CURRENT (
µ
A)
DOES NOT INCLUDE BIAS CURRENT
FOR RESISTOR DIVIDER