Low-Noise, Regulated, Negative
Charge-Pump Power Supplies for GaAsFET Bias
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2a, V
IN
= 6V, T
A
= +25°C, unless otherwise noted.)
MAX850–MAX853
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX850-TOC1
OUTPUT VOLTAGE vs.
INPUT VOLTAGE OVER TEMPERATURE
MAX850-TOC2
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAXIMUM OUTPUT CURRENT (mA)
MAX850-TOC3
-4.16
-4.15
OUTPUT VOLTAGE (V)
-4.14
-4.13
-4.12
-4.11
-4.10
0
2.0
4.0
6.0
8.0
-4.13
I
OUT
= 2.5mA
-4.12
OUTPUT VOLTAGE (V)
-4.11
-4.10
-4.09
T
A
= +85°C
-4.08
-4.07
-4.06
T
A
= +25°C
T
A
= -40°C
60
50
40
30
20
10
10.0
5.0
6.0
7.0
8.0
9.0
10.0
5.0
6.0
7.0
8.0
9.0
10.0
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX850-TOC4
SUPPLY CURRENT
vs. TEMPERATURE
MAX850-TOC5
START-UP TIME vs.
INPUT VOLTAGE
1.80
1.60
START-UP TIME (ms)
1.40
1.20
1.00
0.80
0.60
0.40
0.20
I
OUT
= 5mA
MAX850-TOC6
2.00
NO-LOAD SUPPLY CURRENT (mA)
1.80
1.60
1.40
1.20
1.00
0.80
0.60
5.0
6.0
7.0
8.0
9.0
2.5
2.4
SUPPLY CURRENT (mA)
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
V
IN
= 10.0V
2.00
10.0
-40
-20
0
20
40
60
80
100
5.0
6.0
7.0
8.0
9.0
10.0
INPUT VOLTAGE (V)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
EFFICIENCY vs. LOAD CURRENT
V
IN
= 5.0V
70
60
50
40
30
20
10
1.0 1.5
2.0
2.5
3.0
3.5
4.0
4.5 5.0
LOAD CURRENT (mA)
V
IN
= 10.0V
V
IN
= 6.0V
MAX850-TOC7
80
_______________________________________________________________________________________
EFFICIENCY (%)
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
