Typical operating characteristics (continued) – Rainbow Electronics MAX889 User Manual
Page 4
MAX889
High-Frequency, Regulated,
200mA, Inverting Charge Pump
4
_______________________________________________________________________________________
0
10
30
20
40
50
0
100
50
150
200
250
300
350
MAX889T
OUTPUT RIPPLE
vs. LOAD CURRENT vs. C
OUT
MAX889 toc04
LOAD CURRENT (mA)
OUTPUT RIPPLE (mV)
C
OUT
= 2.2
µF
C
OUT
= 4.7
µF
C
OUT
= 10
µF
0
30
20
10
40
50
60
70
80
90
100
0
200
100
300
400
500
EFFICIENCY vs. LOAD CURRENT
(V
IN
= 5V, V
OUT
= -3.3V)
MAX889 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
MAX889T
MAX889R
MAX889S
0
30
20
10
50
40
90
80
70
60
100
0
50
100
150
200
250
300
350
EFFICIENCY vs. LOAD CURRENT
(V
IN
= 3.3V, V
OUT
= -2.5V)
MAX889 toc06
LOAD CURRENT (mA)
EFFICENCY (%)
MAX889R
MAX889T
MAX889S
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= V
SHDN
= +5V, capacitors from Table 1, T
A
= +25°C, unless otherwise noted.)
MAX889S
LOAD-TRANSIENT RESPONSE
MAX889 toc10
40
µs/div
A
B
20 TO 200mA LOAD STEP
CIRCUIT OF FIGURE 4
A: I
OUT
, 100mA/div
B: V
OUT
, 20mV/div, AC-COUPLED
MAX889S
LINE-TRANSIENT RESPONSE
MAX889 toc11
40
µs/div
A
B
I
OUT
= 200mA
CIRCUIT OF FIGURE 4
A: V
IN
, 2V/div
B: V
OUT
, 10mV/div, AC-COUPLED
MAX889S
STARTUP AND SHUTDOWN
MAX889 toc12
2ms/div
A
B
I
OUT
= 200mA
A: V
OUT
, 1V/div
B: I
IN
, 100mA/div
C: V
SHDN
, 10V/div
C
0
0
1.50
2.00
1.75
2.50
2.25
2.75
3.00
2.5
3.5
4.0
3.0
4.5
5.0
5.5
FREE-RUN OUTPUT RESISTANCE
vs. INPUT VOLTAGE
MAX889 toc07
INPUT VOLTAGE (V)
R
OUT
(Ω
)
1.0
1.5
2.0
2.5
3.0
FREE-RUN OUTPUT RESISTANCE
vs. TEMPERATURE
MAX889 toc08
TEMPERATURE (
°C)
R
OUT
(Ω
)
-40
20
40
-20
0
60
80
0
4
2
8
6
10
12
2.5
3.5
4.0
3.0
4.5
5.0
5.5
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE (REGULATED MODE)
MAX889 toc09
INPUT VOLTAGE (V)
QUIESCENT CURRENT (mA)
MAX889T
MAX889S
MAX889R
V
OUT
= -2.5V