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LTC1844-1.8 PDF预览

LTC1844-1.8

更新时间： 2024-11-16 22:23:55
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
12页 211K
描述
150mA, Micropower, Low Noise, VLDO Linear Regulator

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LTC1844-1.8 数据手册

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Final Electrical Specifications  
LTC1844 Series  
150mA, Micropower,  
Low Noise, VLDO  
Linear Regulator  
May 2003  
U
FEATURES  
DESCRIPTIO  
®
The LTC 1844 Series are low noise VLDOTM (very low  
■
Very Low Dropout:  
90mV at 150mA  
dropout)linearregulatorsdesignedforlowpower/portable  
applications. These regulators can operate from input  
voltages as low as 1.6V. Typical output noise is only  
30µVRMS and typical dropout for the LTC1844-3.3 is just  
90mVatthemaximumloadcurrentof150mA, reducingto  
30mV at 50mA.  
30mV at 50mA (LTC1844-3.3)  
■
Wide Input Voltage Range: 1.6V to 6.5V  
■
Low 35µA Supply Current, Even in Dropout  
■
Low Noise: 30µVRMS (10Hz to 100kHz)  
■
±1.75% Voltage Accuracy Over Temperature,  
Voltage and Current Ranges  
Fast Transient Response  
10nA Supply Current in Shutdown  
The internal P-channel MOSFET pass transistor requires  
no base current, allowing the device to draw only 35µA  
during normal operation, independent of the dropout  
voltage and load current. The quiescent current falls to a  
negligible 10nA during shutdown.  
■
■
■
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V  
■
Adjustable Output Voltage: 1.25V to 6V  
■
Output Current Limit  
■
Other features include high output voltage accuracy,  
excellent transient response, stablity with ultralow ESR  
ceramic capacitors as small as 1µF, reverse-battery and  
reverse-current protection, short-circuit and thermal  
overload protection and output current limiting.  
Reverse-Battery and Reverse-Current Protection  
■
No Protection Diodes Needed  
■
Stable with 1µF Output Capacitor  
■
Stable with Ceramic Capacitors  
■
Short-Circuit and Thermal Overload Protection  
■
Low Profile (1mm) SOT-23 Package  
The LTC1844 regulators are available in a low profile  
(1mm) SOT-23 (ThinSOTTM) package.  
U
APPLICATIO S  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
VLDO and ThinSOT are trademarks of Linear Technology Corporation.  
■
Bluetooth/802.11 Cards  
■
PDAs and Notebook Computers  
■
Portable Instruments and Battery-Powered Systems  
Cellular Phones  
■
U
LTC1844-3.3 Dropout Voltage vs Load Current  
TYPICAL APPLICATIO  
120  
100  
80  
60  
40  
20  
0
Fixed Voltage Low Noise, VLDO Linear Regulator  
1
5
V
V
OUT  
3.3V  
IN  
IN  
OUT  
3.3V TO 6.5V  
1µF  
1µF  
LTC1844-3.3  
4
3
OFF ON  
SHDN  
BYP  
GND  
2
0.1µF  
1844 TA01  
0
50  
75  
(mA)  
100  
125  
150  
25  
I
OUT  
1844 TA02  
1844ia  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
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