ADR292GR-REEL7 Analog Devices, ADR292GR-REEL7 Datasheet - Page 15

• Manufacturer Part Number: ADR292GR-REEL7
• Manufacturer: Analog Devices

VOLTAGE REGULATOR FOR PORTABLE
EQUIPMENT
The ADR291/ADR292 family of references is ideal for provid-
ing a stable, low cost, and low power reference voltage in
portable equipment power supplies. Figure 36 shows how the
ADR291 and ADR292 can be used in a voltage regulator that
not only has low output noise (as compared to switch mode
design) and low power, but also a very fast recovery after
current surges. Some precautions should be taken in the
selection of the output capacitors. Too high an ESR (effective
series resistance) could endanger the stability of the circuit. A
solid tantalum capacitor, 16 V or higher, and an aluminum
electrolytic capacitor, 10 V or higher, are recommended for C1
and C2, respectively. Also, the path from the ground side of C1
and C2 to the ground side of R1 should be kept as short as
possible.
Rev. F | Page 15 of 20
LEAD-ACID
CHARGER
BATTERY
INPUT
6V
Figure 36. Voltage Regulator for Portable Equipment
+
0.1µF
ADR291/
ADR292
GND
V
V
4
2
IN
OUT
NC
402kΩ
1%
R1
6
3
2
3
OP20
402kΩ
7
4
1%
R2
ADR291/ADR292
6
510kΩ
R3
TANT
68µF
C1
IRF9530
+
+ C2
5V, 100mA
1000µF
ELECT