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参数资料
| 型号： | ADP3308ART-2.85-R7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.17 V DROPOUT, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 7/8页 |
| 文件大小： | 137K |
| 代理商： | ADP3308ART-2.85-R7 |
ADP3308
–7–
REV. B
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
A.
APPLICATION CIRCUITS
Crossover Switch
The circuit in Figure 3 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 F
ADP3308-3.3
OUT
IN
GND
SD
C2
0.47 F
VOUT = 3.0V/3.3V
VIN = 4V TO 12V
Figure 3. Crossover Switch
D1
1N5817
C2
100 F
10V
L1
6.8 H
R1
120
C3
2.2 F
3.0V@50mA
C1
100 F
10V
VIN = 2.5V TO 3.5V
R2
30.1k
1%
Q1
2N3906
Q2
2N3906
R4
274k
R3
124k
1%
ADP3000-ADJ
ILIM
VIN
SW1
GND
SW2
FB
ADP3308-3.0
IN
SD
OUT
GND
Figure 5. 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 4, to increase the output
current to 1 A.
VIN = 4V TO 8V
VOUT = 3.0V @ 1A
MJE253*
C1
47 F
R1
50
*AAVID531002 HEAT SINK IS USED
ADP3308-3.0
GND
SD
C2
10 F
IN
OUT
Figure 4. Higher Output Current Linear Regulator
Constant Dropout Post Regulator
The circuit in Figure 5 provides high precision with low dropout
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.
OBSOLETE
相关PDF资料 |
PDF描述 |
|---|---|
| ADP3308ART-2.9-RL | 2.9 V FIXED POSITIVE LDO REGULATOR, 0.17 V DROPOUT, PDSO5 |
| ADP3308ART-3-REEL | 3 V FIXED POSITIVE LDO REGULATOR, 0.17 V DROPOUT, PDSO5 |
| ADP3308ART-3.3-RL | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.17 V DROPOUT, PDSO5 |
| ADP3308ART-3.6-RL | 3.6 V FIXED POSITIVE LDO REGULATOR, 0.17 V DROPOUT, PDSO5 |
| ADP3308ART-2.5 | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.17 V DROPOUT, PDSO5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3308ART-29 | 制造商:AD 制造商全称:Analog Devices 功能描述:anyCAP⑩ 50 mA Low Dropout Linear Regulator |
| ADP3308ART-3 | 制造商:AD 制造商全称:Analog Devices 功能描述:anyCAP⑩ 50 mA Low Dropout Linear Regulator |
| ADP3308ART-3.3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
| ADP3308ART-3.3-RL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel 制造商:Analog Devices 功能描述: |
| ADP3308ART-3.3-RL7 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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