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| 型号： | AS1358-BTTT-33 |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 150mA 9μVrms, 92dB - LDO; Package Type: TSOT23-5; Output Range: 3.3V |
| 封装： | TSOT23-5 |
| 文件页数： | 9/16页 |
| 文件大小： | 900K |
| 代理商： | AS1358-BTTT-33 |
www.austriamicrosystems.com
Revision 1.5
9 - 16
AS1358 / AS1359
Datasheet - Application Information
9 Application Information
9.1 Dropout Voltage
Dropout is the input to output voltage difference, below which the linear regulator ceases to regulate. At this point, the output voltage change
follows the input voltage change. Dropout voltage may be measured at different currents and, in particular at the regulator maximum one. From
this is obtained the MOSFET maximum series resistance over temperature etc. More generally:
(EQ 1)
Dropout is probably the most important specification when the regulator is used in a battery application. The dropout performance of the
regulator defines the useful “end of life” of the battery before replacement or re-charge is required.
Figure 19. Graphical Representation of Dropout Voltage
Figure 19
shows the variation of V
OUT
as V
IN
is varied for a certain load current. The practical value of dropout is the differential voltage (V
OUT
-
V
IN
) measured at the point where the LDO output voltage has fallen by 100mV below the nominal, fully regulated output value. The nominal
regulated output voltage of the LDO is that obtained when there is 500mV (or greater) input-output voltage differential.
9.2 Efficiency
Low quiescent current and low input-output voltage differential are important in battery applications amongst others, as the regulator efficiency is
directly related to quiescent current and dropout voltage. Efficiency is given by:
Efficiency =
%
(EQ 2)
Where:
I
Q
= Quiescent current of LDO
V
DROPOUT
I
LOAD
R
SERIES
=
Dropout
Voltage
100mV
V
IN
V
OUT
V
OUT
V
IN
V
OUT
V
IN
= V
OUT(TYP)
+ 0.5V
V
IN
V
V
IN
I
Q
LOAD
I
LOAD
+
------------------------I
100
相关PDF资料 |
PDF描述 |
|---|---|
| AS1358-BTTT-45 | 150mA 9μVrms, 92dB - LDO; Package Type: TSOT23-5; Output Range: 4.5V |
| AS1360-18-T | 1.5μA Low-Power, 20V, LDO; Package Type: SOT23-3; Output Range: 1.8V |
| AS1360-21-T | 1.5μA Low-Power, 20V, LDO; Package Type: SOT23-3; Output Range: 2.1V |
| AS1360-25-T | 1.5μA Low-Power, 20V, LDO; Package Type: SOT23-3; Output Range: 2.5V |
| AS1360-30-T | 1.5μA Low-Power, 20V, LDO; Package Type: SOT23-3; Output Range: 3.0V |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1358-BTTT-45 | 功能描述:IC REG LDO 4.5V .15A TSOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:4.7 V ~ 15 V 电压 - 压降（标准）:1.2V @ 800mA 稳压器数量:1 电流 - 输出:800mA（最小值） 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-3，DPak（2 引线+接片），SC-63 供应商设备封装:PowerFlex/TO-252 包装:剪切带 (CT) 其它名称:296-31967-1 |
| AS1359 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators |
| AS1359-15 EB | 制造商:AMS 功能描述:BOARD EVAL FOR AS1359-15 |
| AS1359-15-EB | 制造商:ams 功能描述:AS1359 Evaluation Board |
| AS1359-18 EB | 制造商:AMS 功能描述:BOARD EVAL FOR AS1359-18 |
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