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LTC1928-5 PDF预览

LTC1928-5

更新时间： 2022-11-26 07:03:00
品牌 Logo 应用领域
凌特 - Linear 稳压器泵
页数 文件大小 规格书
8页 159K
描述
Doubler Charge Pump with Low Noise Linear Regulator in ThinSOT

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中文翻译

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LTC1928-5 数据手册

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LTC1928-5  
Doubler Charge Pump with  
Low Noise Linear Regulator  
in ThinSOT  
U
FEATURES  
DESCRIPTIO  
TheLTC®1928-5isadoublerchargepumpwithaninternal  
low noise, low dropout (LDO) linear regulator. The part is  
designedtoprovidealownoiseboostedsupplyvoltagefor  
powering noise sensitive devices such as high frequency  
VCOs in wireless applications.  
■
Low Output Noise: 90  
Fixed Output Voltage: 5V  
µVRMS (100kHz BW)  
■
■
■
■
■
■
■
■
■
■
Input Voltage Range: 2.7V to 4.4V  
No Inductors Required  
Uses Small Ceramic Capacitors  
Output Current Up to 30mA  
550kHz Switching Frequency  
Low Operating Current: 190µA  
Low Shutdown Current: 4µA  
Internal Thermal Shutdown and Current Limiting  
Low Profile (1mm) ThinSOTTM Package  
U
An internal charge pump converts a 2.7V to 4.4V input to  
a boosted output, while the internal LDO regulator con-  
verts the boosted voltage to a low noise regulated output.  
Theregulatoriscapableofsupplyingupto30mAofoutput  
current. Shutdown reduces the supply current to <8µA,  
removes the load from VIN by disabling the regulator and  
discharges VOUT to ground through a 200Ω switch.  
APPLICATIO S  
■
The LTC1928-5 LDO regulator is stable with only 2µF on  
the output. Small ceramic capacitors can be used, reduc-  
ing PC board area.  
VCO Power Supplies for Cellular Phones  
2-Way Pagers  
Wireless PCMCIA Cards  
Portable Medical Instruments  
Low Power Data Acquisition  
Remote Transmitters  
White LED Drivers  
GaAs Switches  
■
■
■
The LTC1928-5 is short-circuit and overtemperature pro-  
tected. The part is available in a 6-pin low profile  
(1mm)ThinSOT package.  
■
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation  
ThinSOT is a trademark of Linear Technology Corporation.  
■
U
TYPICAL APPLICATION  
Output Noise (BW = 10Hz to 2.5MHz)  
LTC1928-5  
5V  
3
4
2
V
1
5
6
IN  
2.7V TO 4.4V  
V
V
V
OUT  
IN  
OUT  
4.7µF  
4.7µF  
VOUT  
200µV/DIV  
CP  
CPO  
GND  
4.7µF  
0.47µF  
CN/SHDN  
19285 F01  
Figure 1. Low Noise 5V Power Supply  
C
CPO = COUT = 4.7µF 100µs/DIV  
19285 TA01  
IOUT = 10mA  
V
IN = 3V  
VOUT = 5V  
TA = 25°C  
1
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