Low-Noise, Regulated, Negative
Charge-Pump Power Supplies for GaAsFET Bias
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, V
IN
= 6V, T
A
= +25°C, unless otherwise noted.)
MAX850/MAX851/MAX853
START-UP FROM SHUTDOWN
MAX852
START-UP FROM SHUTDOWN
MAX850–MAX853
V
OUT
2V/div
V
OUT
2V/div
V
SHDN
5V/div
V
OSC
5V/div
200µs/div
CIRCUIT OF FIGURE 2a, V
IN
= 6.0V, V
OUT
= -4.1V, I
OUT
= 5mA
200µs/div
CIRCUIT OF FIGURE 2a, V
IN
= 6.0V, V
OUT
= -4.1V, I
OUT
= 5mA
SHUTDOWN OCCURS WHEN 100kHz EXTERNAL CLOCK IS GATED OFF
LINE-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
0.01mA
V
OUT
20mV/div
I
OUT
5mA
6.0V V
IN
5.5V
V
OUT
50mV/div
2ms/div
V
OUT
= -4.08V, I
OUT
= 5mA, AC COUPLED
1ms/div
V
OUT
= -4.0V, AC COUPLED
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
