For Applications Where the LDO Voltage Regulator Operates Mostly Under No Load Conditions, the Quiescent Current Plays a Major Role
A low dropout LDO voltage regulator is a linear device that maintains a stable output over a wide range of input voltages and output currents. LDOs operate at low voltage differences between input and output. Furthermore, they can be used as noise reduction patches to solve voltage regulation problems caused by electromagnetic interference (EMI) and printed circuit board (PCB) routing. Luckily, the enable function allows switching the regulator on and off, thus improving the overall system efficiency by turning off unused functions.
Enabling
The Enable input (EN), available in positive and negative logic, turns the device on and off by an external signal. Active-high logic activates the device when the voltage at the EN-input exceeds the high-logic threshold. The active-low logic switches the device off when the EN-voltage falls below the logic low threshold. The EN-function is an important feature when sequencing power supplies in multi-rail systems. Keeping the internal bandgap reference running while the regulator is disabled allows for fast turn-on times.
Figure 1: DIOTEC LDI8119-xxEN internal block diagram
Shutdown-Current and Quiescent current
When the LDO is turned off and connected to the battery system, the input current will be limited, usually up to 1 μA. This Shutdown current is commonly confused with the quiescent current which is the current drawn by the device when it is enabled and operating with no load. Both shutdown and quiescent current are important parameters when realizing long battery lifetimes in portable devices. Using the datasheet values for shutdown and quiescent current designers can calculate power dissipation as shown in the below equations.
For example, when the device is fully operational, the voltage is regulated from VIN 10.0 V to VOUT 5.0 V with an output current of 400 mA. The datasheet value for quiescent current is 60 μA. This will result in a power dissipation (PD) of:
Check again with new value for IQ
PD= (VIN-VOUT ) ∙ IOUT + (VIN ∙ IQ )
PD= (10 V - 5 V) ∙ 0.4 A + (10 V ∙ 0.00006 A)
PD= 2.0006 W
When the device is switched into no load operation, the output current falls as low as 200
μA. Then the PD becomes:
PD= (10 V-5 V) ∙ 0.0002 A + (10 V ∙ 0.00006 A)
PD= 1.6 mW
In this case, the quiescent current accounts for nearly 50% of the total power dissipation.In conclusion, the following is stated: For applications where the device operates mostly under no load conditions, the quiescent current plays a major role and should be considered when planning the design.
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本文由电子人生转载自Diotec，原文标题为:LDO Voltage Regulator with Enable Function and Low IQ，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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产品型号
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品类
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Type
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Package
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Input Voltage Vin[V]
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Output Voltage VOUTmin[V]
|
Output Voltage VOUTmax[V]
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Junction Temperature Tjmax [℃]
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Quiescent Current IQ[mA]
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Dropout Voltage VD[V]
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Output Current IO[A]
|
|
DI62061.8S1
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Linear Voltage Regulator
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SMD
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SOT-23
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7
|
1.782
|
1.818
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85
|
0.008
|
0.39
|
0.08
|
选型表 - DIOTEC 立即选型
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LDI734CXXEN低压差无电容正向固定稳压器
该资料介绍了LDI734CxxEN系列低 dropout电压（LDO）正固定电压稳压器。这些稳压器无需外部电容器即可稳定工作，具有高效率、低dropout电压等特点，适用于电池供电设备、便携式设备和手持产品。
DIOTEC - LOW DROPOUT CAPACITOR FREE POSITIVE FIXED VOLTAGE REGULATORS,低压差无电容正向固定稳压器,LDI734C1.8EN,LDI734CXXEN,LDI734C2.5EN,LDI734C1.2EN,LDI734C3.3EN,手持式产品,REMOTE CONTROLS,HAND-HELD PRODUCTS,电动工具,遥控器,BATTERY POWERED DEVICES,POWER TOOLS,COMMERCIAL,INDUSTRIAL,电池供电设备,便携式设备,PORTABLE EQUIPMENT,商业的,工业
LDI8233-3.3EN..LDI8233-05EN低压差正固定稳压器
该资料介绍了LDI8233系列低压差正固定电压稳压器。这些器件具有低功耗、高效率的特点，适用于多种电子设备中，如线性稳压器、SCSI终止调节器、开关模式DC-DC转换器和电池备份电源等。
DIOTEC - 低压差正固定电压调节器,LOW DROPOUT POSITIVE FIXED VOLTAGE REGULATORS,LDI8233-3.6EN,LDI8233-05EN,LDI8233-3.3EN,BATTERY BACKED-UP REGULATED SUPPLY,COMMERCIAL,INDUSTRIAL,备用电池稳压电源,商业的,SWITCH MODE DC-DC CONVERTERS,ELECTRICITY METERS,开关模式DC-DC转换器,电表,工业,智能电表,SMART-METERS
【应用】正固定电压稳压器LDI8233-3.3EN用于微控制器供电，实现无绳修剪树篱
Diotec正固定电压稳压器LDI8233-3.3EN可为微控制器供电，提供高达40V的输入电压、100mA的输出电流和热过载保护。在不使用的情况下，可利用启用功能关闭整个控制电路，有助于延长电池待机时间。适合于任何电池供电的花园设备。
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可定制无线位移传感器量程范围10~600mm，采用了无线传输方式，可远程自动实时检（监）测位移量值，准确度级别(级)：0.2、0.5;内置模块：无线传输模块、供电模块;传输距离L(m)：可视距离1000 (Zigbee、 LORA)。
最小起订量： 1pcs 提交需求>
配备KEYSIGHT网络分析仪，可测量无线充电系统发射机/接收机线圈的阻抗，电感L、电阻R、电感C以及品质因数Q，仿真不同充电负载阻抗下的无线充电传输效率。支持到场/视频直播测试，资深专家全程指导。
实验室地址： 深圳 提交需求>
授权代理品牌：集成电路
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授权代理品牌：接插件及结构件
授权代理品牌：部件、组件及配件
授权代理品牌：电源及模块
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授权代理品牌：仪器仪表及测试配组件
授权代理品牌：电工工具及材料
授权代理品牌：机械电子元件
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