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| 型号： | AS1362-BTTT-45 |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 300mA 9μVrms, 92dB, POK; Package Type: TSOT23-6; Output Range: 4.5V |
| 中文描述： | 无电容，NMOS管，150mA的低压差稳压器的反向电流保护 |
| 封装： | TSOT23-6 |
| 文件页数： | 10/15页 |
| 文件大小： | 730K |
| 代理商： | AS1362-BTTT-45 |
www.austriamicrosystems.com
Revision 1.03
10 - 15
AS1361/AS1362
Datasheet - Detailed Description
Figure 18. AS1361/AS1362 - Block Diagram
Power-OK
The power-ok circuitry is built around an N-channel MOSFET. The circuitry monitors the output voltage and if the volt-
age goes out of regulation (e.g. during dropout, current limit, or thermal shutdown) pin POK goes low.
The power-OK feature is not active during shutdown and provides a power-on-reset (POR) function that can operate
down to V
IN
= 1V. A capacitor to GND may be added to generate a POR delay.
To obtain a logic-level output, connect a pull-up resistor from pin POK to pin OUT. Larger values for this resistor will
help minimize current consumption; a 100k
Ω
resistor is perfect for most applications
(see Figure 1 on page 1)
.
Current Limit
The AS1361/AS1362 include a current limiting circuitry to monitor and control the P-channel MOSFET pass transis-
tor’s gate voltage, thus limiting the device output current to 270mA (AS1361) and 510mA (AS1362).
Note:
See
Table 4 on page 4
for the recommended min and max current limits. The output can be shorted to ground
indefinitely without causing damage to the device.
Thermal Protection
Integrated thermal protection circuitry limits total power dissipation in the AS1361/AS1362. When the junction temper-
ature (T
J
) exceeds +160oC, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass
transistor and allowing the device to cool down. The thermal sensor turns the pass transistor on again after the
device’s junction temperature drops by 10oC, resulting in a pulsed output during continuous thermal-overload condi-
tions.
Note:
Thermal protection is designed to protect the devices in the event of fault conditions. For continuous operation,
do not exceed the absolute maximum junction temperature rating of +150oC.
Operating Region and Power Dissipation
The AS1361/AS1362 maximum power dissipation is dependant on the thermal resistance of the case and PCB, the
temperature difference between the die junction and T
AMB
, and airflow rate.
Power dissipation across the device is calculated as:
PD = I
OUT
(V
IN
- V
OUT
)
(EQ 1)
AS1361/AS1362
Shutdown and
Power-Down
Control
Thermal
Sensor
OUT
IN
SHDNN
GND
BYPASS
-
+
MOS
Driver w/
I
LIMIT
Error
Amp
POK
+
–
95%
1.25 Reference
and Noise Bypass
相关PDF资料 |
PDF描述 |
|---|---|
| AS1363-BSTT-AD | 500mA Low-Dropout, Low Noise |
| AS1364-BTDT-AD | 1A LDO, Low Noise |
| AS1367-BTDT-12 | Adaptive LDO |
| AS1367-BTDT-18 | Adaptive LDO |
| AS1367-BTDT-30 | Adaptive LDO |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1363 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:500mA, Low-Dropout Linear Voltage Regulator |
| AS1363_13 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:1A Low Dropout Linear Voltage Regulator |
| AS1363-15 EB | 制造商:AMS 功能描述:BOARD EVAL FOR AS1363-15 |
| AS1363-15-EB | 制造商:ams 功能描述:AS1363 Evaluation Board |
| AS1363-18 EB | 制造商:AMS 功能描述:BOARD EVAL FOR AS1363-18 |
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