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AD680 Datenblatt(PDF) 10 Page - Analog Devices

Teilenummer AD680
Bauteilbeschribung  Low Power, Low Cost 2.5 V Reference
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD680 Datenblatt(HTML) 10 Page - Analog Devices

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AD680
Rev. H | Page 10 of 12
4.5 V REFERENCE FROM A 5 V SUPPLY
The AD680 can be used to provide a low power, 4.5 V reference,
as shown in Figure 19. In addition to the AD680, the circuit
uses a low power op amp and a transistor in a feedback con-
figuration that provides a regulated 4.5 V output for a power
supply voltage as low as 4.7 V. The high quality tantalum 10 μF
capacitor (C1) in parallel with the ceramic 0.1 μF capacitor (C2)
and the 3.9 Ω resistor (R5) ensure a low output impedance up to
approximately 50 MHz (see Figure 19).
6
3
2
7
4
OP90
+IN
V+
V–
OUT
–IN
R1
2k
Ω
1%
CF
0.1
μF
R4
3.57k
Ω
R2
2.5k
Ω
1%
AD680
VOUT
GND
VIN
0.1
μF
R3
1k
Ω
CC
3.3
μF
2N2907A
4.7V TO 15V
C1
10
μF
+
C2
0.1
μF
R5
3.9
Ω
Figure 19. 4.5 V Reference Running from a Single 5 V Supply
VOLTAGE REGULATOR FOR PORTABLE
EQUIPMENT
The AD680 is ideal for providing a stable, low cost, low power
reference voltage in portable equipment power supplies.
Figure 20 shows how the AD680 can be used in a voltage
regulator that not only has low output noise (as compared to a
switch mode design) and low power, but it also has a very fast
recovery after current surges. Some caution 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 electro-
lytic 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.
2
3
7
6
4
OP777
+
R3
510k
Ω
IRF9530
AD680
VOUT
GND
VIN
C1
68
μF
TANT
+
C2
1000
μF
ELECT
+
2
6
TEMP 3
4
0.1
μF
CHARGER
INPUT
6V
LEAD-ACID
BATTERY
+
R2
402k
Ω 1%
R1
402k
Ω 1%
Figure 20. Voltage Regulator for Portable Equipment


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