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參數(shù)資料
| 型號(hào)： | ADP3309ART-29 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | anyCAP⑩ 100 mA Low Dropout Linear Regulator |
| 中文描述： | anyCAP⑩100 mA時(shí)低壓差線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 120K |
| 代理商： | ADP3309ART-29 |
ADP3309
–7–
REV. 0
The following general guidelines will be helpful when designing
a board layout:
1. PC board traces with larger cross section areas will remove
more heat. For optimum results, use PC boards with thicker
copper and or wider traces.
2. Increase the surface area exposed to open air so heat can be
removed by convection or forced air flow.
3. Do not use solder mask or silk screen on the heat dissipating
traces because it will increase the junction to ambient
thermal resistance of the package.
Shutdown Mode
Applying a TTL high signal to the shutdown pin or tying it to
the input pin will turn the output ON. Pulling the shutdown pin
down to a TTL low signal or tying it to ground will turn the
output OFF. In shutdown mode, quiescent current is reduced
to less than 1
μ
A.
Error Flag Dropout Detector
The ADP3309 will maintain its output voltage over a wide
range of load, input voltage and temperature conditions. If the
output is about to lose regulation, for example, by reducing the
supply voltage below the combined regulated output and drop-
out voltages, the
ERR
pin will be activated. The
ERR
output is
an open collector that will be driven low.
Once set, the
ERR
or flag’s hysteresis will keep the output low
until a small margin of operating range is restored either by
raising the supply voltage or reducing the load.
APPLICATION CIRCUITS
Crossover Switch
The circuit in Figure 21 shows that two ADP3309s can be used
to form a mixed supply voltage system. The output switches
between two different levels selected by an external digital input.
Output voltages can be any combination of voltages from the
Ordering Guide of the data sheet.
V
OUT
= 2.7V/3.3V
V
IN
= 4V TO 12V
OUTPUT SELECT
4V
0V
ADP3309-2.7
OUT
IN
SD
GND
ADP3309-3.3
+
+
IN
OUT
C1
1.0
m
F
C2
0.47
m
F
SD
GND
Figure 21. Crossover Switch
Higher Output Current
The ADP3309 can source up to 100 mA without any heatsink
or pass transistor. If higher current is needed, an appropriate
pass transistor can be used, as in Figure 22, to increase the
output current to 1 A.
ADP3309-3.3
OUT
IN
SD
GND
+
V
IN
= 4V TO 8V
MJE253*
V
OUT
= 3.3V@1A
C1
47
m
F
C2
10
m
F
*AAVID531002 HEATSINK IS USED
ERR
R1
50
V
Figure 22. Higher Output Current Linear Regulator
Constant Dropout Post Regulator
The circuit in Figure 23 provides high precision with low drop-
out for any regulated output voltage. It significantly reduces the
ripple from a switching regulator while providing a constant
dropout voltage, which limits the power dissipation of the LDO
to 30 mW. The ADP3000 used in this circuit is a switching
regulator in the step-up configuration.
+
V
IN
= 2.5V TO 3.5V
C1
100
m
F
10V
L1
6.8
m
H
D1
1N5817
C2
100
m
F
10V
I
LIM
V
IN
SW1
SW2
GND
FB
ADP3000-ADJ
R1
120
V
R2
30.1k
V
1%
Q1
2N3906
ADP3309-3.3
IN
OUT
GND
SD
R3
124k
V
1%
R4
274k
V
Q2
2N3906
C3
2.2
m
F
3.3V@100mA
Figure 23. Constant Dropout Post Regulator
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADP3309ART-3 | anyCAP⑩ 100 mA Low Dropout Linear Regulator |
| ADP3309ART-33 | anyCAP⑩ 100 mA Low Dropout Linear Regulator |
| ADP3309ART-36 | anyCAP⑩ 100 mA Low Dropout Linear Regulator |
| ADP3310AR-28 | Circular Connector Cable Assembly; Connector Type A:Circular Plug; Connector Type B:Stripped End Leads; Cable Length:10ft RoHS Compliant: Yes |
| ADP3310AR-3 | Circular Connector Cable Assembly; Connector Type A:Circular Plug; Connector Type B:Stripped End Leads; Cable Length:10ft RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3309ART-3 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:anyCAP⑩ 100 mA Low Dropout Linear Regulator |
| ADP3309ART-3.3 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Positive Fixed Voltage Regulator |
| ADP3309ART-3.3-RL | 制造商:Analog Devices 功能描述: |
| ADP3309ART-3.3-RL7 | 制造商:Analog Devices 功能描述:LDO Regulator Pos 3.3V 0.15A 5-Pin SOT-23 T/R 制造商:Rochester Electronics LLC 功能描述:ANYCAPTM 100MA LDO LINEAR REGULATOR - Tape and Reel 制造商:Analog Devices 功能描述:IC VOLTAGE REGULATOR |
| ADP3309ART-3.6 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Positive Fixed Voltage Regulator |
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