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ADM8839
It is possible to configure the ADM8839 to supply up to 400 μA
on the ±15 V outputs by changing its configuration slightly, as
shown in Figure 17.
C5, 2.2μF
The configuration in Figure 17 can supply up to 400 μA of
current on both the +15 V and the ?15 V outputs. If the load on
the ±15 V does not draw any current, the voltage on the ±15 V
outputs can rise up to ±16.5 V (see Figure 18). In this
configuration, VOUT (Pin 2) is connected to +5VIN (Pin 5).
ADM8839
V CC
VOLTAGE
DOUBLER
C1+
C1–
C1, 2.2μF
17.0
OSCILLATOR
LDO
VOLTAGE
VOUT
LDO_IN
CURRENT BOOST
CONFIGURATION
CONNECTION
C6, 2.2μF
16.5
16.0
+15V AT 25°C
LDO_ON/OFF
CONTROL
LOGIC
REGULATOR
+5VOUT
+5VIN
+5V
15.5
–15V AT 25° C
C7, 2.2μF
DOUBLE
C2+
VOLTAGE
C2–
C2, 0.22μF
15.0
TRIPLER
TRIPLE
C3+
TIMING
C3–
C3, 0.22μF
14.5
GENERATOR
+15VOUT
+15V
SHDN
SHUTDOWN
CONTROL
DISCHARGE
VOLTAGE
INVERTER
C4+
C4–
C8, 0.22μF
C4, 0.22μF
14.0
0
100
200 300
I LOAD (μA)
400
500
GND
–15VOUT
–15V
C9, 0.22μF
Figure 18. +15 V/?15 V Output Voltage vs. Load Current,
Current Boost Configuration
Figure 17. Current Boost Configuration
Rev. C | Page 9 of 12
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