ADR440 Analog Devices, Inc., ADR440 Datasheet - Page 17

• Manufacturer Part Number: ADR440
• Description: Ultralow Noise, Ldo Xfet Voltage References With Current Sink And Source
• Manufacturer: Analog Devices, Inc.

PRECISION OUTPUT REGULATOR
(BOOSTED REFERENCE)
Higher current drive capability can be obtained, without
sacrificing accuracy, by using the circuit in Figure 41. The
operational amplifier regulates the MOSFET turn-on, forcing
V
increased current drive capability. The circuit allows a 50 mA
load; if higher current drive is required, use a larger MOSFET.
For fast transient response, add a buffer at V
capacitive loading.
O
V
0.1µF
IN
to equal the V
C
IN
ADR440/
ADR441/
ADR443/
ADR444/
ADR445
GND
V
2
4
IN
V
Figure 41. Boosted Output Reference
REF
OUT
. Current is then drawn from V
6
C
0.1µF
OUT
15V
–V
O
200Ω
to aid with
R
2N7002
L
IN
, allowing
C
1µF
L
V
O
Rev. B | Page 17 of 20
ADR440/ADR441/ADR443/ADR444/ADR445