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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： | 9/15页 |
| 文件大小： | 730K |
| 代理商： | AS1362-BTTT-45 |
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Revision 1.03
9 - 15
AS1361/AS1362
Datasheet - Detailed Description
8 Detailed Description
The AS1361/AS1362 are ultra-low-noise, low-dropout, low-quiescent current linear-regulators specifically designed for
space-limited applications. The devices are available with preset output voltages from 1.5 to 4.5V in 50mV increments.
These devices can supply loads up to 150/300mA. As shown in
Figure 18
, the AS1361/AS1362 consist of an inte-
grated bandgap core and noise bypass circuitry, error amplifier, P-channel MOSFET pass transistor, and internal feed-
back voltage-divider.
The output voltage is fed back through an internal resistor voltage-divider connected to pin OUT. An external bypass
capacitor connected to pin BYPASS reduces noise at the output. Additional blocks include a current limiter, thermal
sensor, and shutdown logic.
Internal Voltage Reference
The 1.25V bandgap reference is connected to the error amplifier’s inverting input. The error amplifier compares this
reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference
voltage, the pass-transistor gate is pulled low. This allows more current to pass to the output and increases the output
voltage. If the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the
output.
Internal P-Channel Pass Transistor
The AS1361/AS1362 feature a 0.5
Ω
(typ) P-channel MOSFET pass transistor, which provides several advantages
over similar designs using a PNP pass transistor, including prolonged battery life. The P-channel MOSFET does not
require a base driver, thus quiescent current is dramatically reduced. The AS1361/AS1362 LDOs do not exhibit prob-
lems associated with typical PNP-based LDOs, and consume only 40μA of quiescent current in light load and 220μA in
dropout
(see Typical Operating Characteristics on page 6)
.
Output Voltage
The AS1361/AS1362 deliver preset output voltages from 1.5 to 4.5V, in 50mV increments
(see Ordering Information on
page 14)
.
Shutdown
The AS1361/AS1362 feature a low-power shutdown mode that reduces quiescent current to <200nA. Driving SHDNN
low disables the internal voltage reference, error amplifier, gate-drive circuitry, and P-channel MOSFET pass transistor
(see Figure 18)
, and the device output enters a high-impedance state.
Note:
For normal operation connect pin SHDNN to pin IN.
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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