- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄374020 > ADP3307ART-33 (Analog Devices, Inc.) High Accuracy anyCAP⑩ 100 mA Low Dropout Linear Regulator PDF資料下載
參數(shù)資料
| 型號(hào)： | ADP3307ART-33 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Accuracy anyCAP⑩ 100 mA Low Dropout Linear Regulator |
| 中文描述： | 高精度anyCAP⑩一○○毫安低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 156K |
| 代理商： | ADP3307ART-33 |
ADP3307
–7–
REV. 0
V
OUT
= 3.3V
V
IN
+
C1
1
m
F
ADP3307-3.3
IN
NR
OUT
ERR
ON
OFF
SD
GND
330k
E
OUT
C2
4.7
m
F
+
R1
C
10nF
Figure 21. Noise Reduction Circuit
T hermal Overload Protection
T he ADP3307 is protected against damage due to excessive
power dissipation by its thermal overload protection circuit,
which limits the die temperature to a maximum of 165
°
C. Un-
der extreme conditions (i.e., high ambient temperature and
power dissipation), where die temperature starts to rise above
165
°
C, the output current is reduced until the die temperature
has dropped to a safe level. Output current is restored when the
die temperature is reduced.
Current and thermal limit protections are intended to protect
the device against accidental overload conditions. For normal
operation, device power dissipation should be externally limited
so that junction temperatures will not exceed 125
°
C.
Calculating Junction T emperature
Device power dissipation is calculated as follows:
P
D
= (
V
IN
– V
OUT
)
I
LOAD
+ (
V
IN
)
I
GND
Where
I
LOAD
and
I
GND
are load current and ground current,
V
IN
and
V
OUT
are input and output voltages respectively.
Assuming I
LOAD
= 100 mA, I
GND
= 2 mA, V
IN
= 5.5 V and
V
OUT
= 3.3 V, device power dissipation is:
P
D
= (5.5 – 3.3) 0.1 + 5.5
×
2
mA
= 0.231
W
T
=
T
J
–
T
A
=
P
D
×
θ
J
A
= 0.231
×
165 = 38
°
C
With a maximum junction temperature of 125
°
C, this yields a
maximum ambient temperature of ~72
°
C.
Printed Circuit Board Layout Consideration
Surface mount components rely on the conductive traces or
pads to transfer heat away from the device. Appropriate PC
board layout techniques should be used to remove heat from the
immediate vicinity of the package.
T he 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 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 silkscreen on the heat dissipating
traces because it will increase the junction-to-ambient ther-
mal resistance of the package.
Shutdown Mode
Applying a T T L 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 T T L low level or tying it to ground will turn the
output OFF. In shutdown mode, quiescent current is reduced
to less than 1
μ
A.
E rror Flag Dropout Detector
T he ADP3307 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. T he
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.
APPLICAT IONS CIRCUIT S
Crossover Switch
T he circuit in Figure 22 shows that two ADP3307s can be used
to form a mixed supply voltage system. T he 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.
ADP3307-2.7
ADP3307-3.3
+
OUT
IN
SD
GND
+
IN
OUT
SD
GND
C1
1.0
m
F
C2
0.47
m
F
V
OUT
= 2.7V/3.3V
V
IN
= 4V TO 12V
OUTPUT SELECT
4V
0V
Figure 22. Crossover Switch
Higher Output Current
T he ADP3307 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 23, to increase the
output current to 1 A.
ADP3307-3.3
OUT
IN
SD
GND
+
V
IN
= 4V TO 8V
MJE253*
V
OUT
= 3.3V@1A
C1
47
m
F
C2
10
m
F
*AAVID531002 HEAT SINK IS USED
ERR
R1
50
V
Figure 23. High Output Current Linear Regulator
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADP3308ART-27 | anyCAP⑩ 50 mA Low Dropout Linear Regulator |
| ADP3308 | 500mA Li-Ion Charger w/Integrated 150mA Synchronous Buck Converter, Output Adjustable 20-QFN -40 to 85 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3307ART-3-REEL7 | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel 制造商:Analog Devices 功能描述: |
| ADP3308 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Accuracy anyCAP⑩ Adjustable 200 mA Low Dropout Linear Regulator |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。