ADM8839ACPZ-REEL データシートの表示（PDF） - Analog Devices
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ADM8839ACPZ-REEL Datasheet PDF : 12 Pages
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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.
LDO_ON/OFF
SHDN
VCC
ADM8839
C5, 2.2µF
VOLTAGE
DOUBLER
OSCILLATOR
CONTROL
LOGIC
LDO
VOLTAGE
REGULATOR
TIMING
GENERATOR
DOUBLE
VOLTAGE
TRIPLER
TRIPLE
VOLTAGE
SHUTDOWN
INVERTER
CONTROL DISCHARGE
C1+
C1, 2.2µF
C1–
VOUT
LDO_IN
CURRENT BOOST
CONFIGURATION
CONNECTION
C6, 2.2µF
+5VOUT
+5VIN
+5V
C7, 2.2µF
C2+
C2, 0.22µF
C2–
C3+
C3– C3, 0.22µF
+15VOUT
+15V
C8, 0.22µF
C4+
C4, 0.22µF
C4–
GND
–15VOUT
–15V
C9, 0.22µF
Figure 17. Current Boost Configuration
ADM8839
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).
17.0
16.5
+15V AT 25°C
16.0
–15V AT 25°C
15.5
15.0
14.5
14.0
0
100
200
300
400
500
ILOAD (µA)
Figure 18. +15 V/−15 V Output Voltage vs. Load Current,
Current Boost Configuration
Rev. C | Page 9 of 12
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