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參數(shù)資料
| 型號： | ADP3308 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 500mA Li-Ion Charger w/Integrated 150mA Synchronous Buck Converter, Output Adjustable 20-QFN -40 to 85 |
| 中文描述： | anyCAP⑩50毫安低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 115K |
| 代理商： | ADP3308 |
ADP3308
–7–
REV. A
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.
APPLICATION CIRCUITS
Crossover Switch
The circuit in Figure 21 shows that two ADP3308s 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.
ADP3308-3.0
OUT
IN
GND
OUTPUT SELECT
4V
0V
SD
C1
1.0
m
F
ADP3308-3.3
OUT
IN
GND
SD
C2
0.47
m
F
V
OUT
= 3.0V/3.3V
V
IN
= 4V TO 12V
Figure 21. Crossover Switch
D1
1N5817
C2
100
m
F
10V
L1
6.8
m
H
R1
120
V
C3
2.2
m
F
3.0V@50mA
C1
100
m
F
10V
V
IN
= 2.5V TO 3.5V
R2
30.1k
V
1%
Q1
2N3906
Q2
2N3906
R4
274k
V
R3
124k
V
1%
ADP3000-ADJ
I
LIM
V
IN
SW1
GND
SW2
FB
ADP3308-3.0
IN
SD
GND
OUT
Figure 23. Constant Dropout Post Regulator
Higher Output Current
The ADP3308 can source up to 50 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.
V
IN
= 4V TO 8V
V
OUT
= 3.0V @ 1A
MJE253*
C1
47
m
F
R1
50
V
*AAVID531002 HEAT SINK IS USED
ADP3308-3.0
GND
SD
C2
10
m
F
IN
OUT
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADP3308ART-285 | anyCAP⑩ 50 mA Low Dropout Linear Regulator |
| ADP3308ART-29 | Circular Connector; No. of Contacts:3; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:20; Circular Contact Gender:Pin; Circular Shell Style:Cable Receptacle; Insert Arrangement:20-19 RoHS Compliant: No |
| ADP3308ART-3 | AB 9C 1#12 8#16 SKT RECP |
| ADP3308ART-33 | anyCAP⑩ 50 mA Low Dropout Linear Regulator |
| ADP3308ART-36 | anyCAP⑩ 50 mA Low Dropout Linear Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3308ART-2.5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| ADP3308ART-2.5-RL7 | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ADP3308ART-2.7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| ADP3308ART-2.7-RL | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADP3308ART-2.7-RL7 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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