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LP38798

更新时间： 2024-11-14 12:02:39
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德州仪器 - TI 稳压器射频
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23页 2396K
描述
LP38798-ADJ High PSRR, Ultra Low Noise, 800 mA Linear Voltage Regulator for RF/Analog Circuits

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LP38798 数据手册

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LP38798  
www.ti.com  
SNOSCT6A –MARCH 2013–REVISED MAY 2013  
LP38798-ADJ High PSRR, Ultra Low Noise, 800 mA Linear Voltage Regulator for  
RF/Analog Circuits  
1
FEATURES  
DESCRIPTION  
The LP38798-ADJ is a high performance linear  
regulator capable of supplying 800 mA output current.  
Designed to meet the requirements of sensitive  
RF/Analog circuitry, the LP38798-ADJ implements a  
novel linear topology on an advanced CMOS process  
to deliver ultra-low output noise and high PSRR at  
•
Ultra-Low Output Noise: 5 µVRMS (10Hz to 100  
kHz)  
•
•
High PSRR: 90 dB at 10 kHz, 60 dB at 100 kHz  
Wide Operating Input Voltage Range: 3.0V to  
20V  
switching  
power  
supply  
frequencies.  
The  
•
±1.0% Output Voltage Initial Accuracy (TJ =  
25°C)  
LP38798SD-ADJ is stable with both ceramic and  
tantalum output capacitors and requires a minimum  
output capacitance of only 1 µF for stability.  
•
•
Very Low Dropout : 200 mV (Typical) at 800mA  
Stable with Ceramic or Tantalum Output  
Capacitors  
The LP38798-ADJ can operate over a wide input  
voltage range (3.0V to 20V) making it well suited for  
many post-regulation applications.  
•
•
Excellent Line and Load Transient Response  
Current Limit and Over-Temperature  
Protection  
The LP38798-ADJ is available in a 12-Lead WSON  
package (4.0 x 4.0 x 0.8 mm) with Thermal Pad.  
APPLICATIONS  
•
•
•
•
RF and VCO Power  
Wireless LAN Devices  
Wireless Cable Modems  
Low Noise Post-Regulation  
Typical Application Circuit  
1
2
3
4
5
6
12  
IN  
OUT  
V
V
OUT  
IN  
11  
10  
9
IN  
OUT  
OUT(FB)  
SET  
IN(CP)  
C
OUT  
+
LP38798-ADJ  
C
IN  
CP  
C
CP  
R1  
R2  
V
EN  
8
7
EN  
FB  
ON  
OFF  
GND(CP)  
GND  
DAP  
GND  
GND  
*.  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2013, Texas Instruments Incorporated  
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