ADR440A AD [Analog Devices], ADR440A Datasheet - Page 17

• Manufacturer Part Number: ADR440A
• Description: Ultralow Noise, LDO XFET Voltage References with Current Sink and Source
• Manufacturer: AD [Analog Devices]

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. A | Page 17 of 20
ADR440/ADR441/ADR443/ADR444/ADR445