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MAX8840ELT18T

更新时间： 2024-09-16 00:44:43
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美信 - MAXIM /
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10页 343K
描述
Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in μDFN

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MAX8840ELT18T 数据手册

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19-0629; Rev 0; 10/06  
Ultra-Low-Noise, High PSRR, Low-Dropout,  
150mA Linear Regulators in µDFN  
General Description  
Features  
♦ Space-Saving 1.0mm x 1.5mm x 0.8mm µDFN  
The MAX8840/MAX8841/MAX8842 ultra-low-noise, low-  
dropout (LDO) linear regulators are designed to deliver  
up to 150mA continuous output current. These regula-  
tors achieve a low 120mV dropout for 120mA load cur-  
rent. The MAX8840 uses an advanced architecture to  
♦ 11µV  
Output Noise at 100Hz to 100kHz  
RMS  
Bandwidth (MAX8840)  
♦ 78dB PSRR at 1kHz (MAX8840)  
♦ 120mV Dropout at 120mA Load  
achieve ultra-low output voltage noise of 11µV  
PSRR of 54dB at 100kHz.  
and  
RMS  
♦ Stable with 1µF Ceramic Capacitor for Any Load  
♦ Guaranteed 150mA Output  
♦ Only Need Input and Output Capacitors (MAX8841)  
♦ Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,  
2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and  
Adjustable (MAX8842)  
The MAX8841 does not require a bypass capacitor,  
hence achieving the smallest PC board area. The  
MAX8842 output voltage can be adjusted with an exter-  
nal divider.  
The MAX8840/MAX8841 are preset to a variety of volt-  
ages in the 1.5V to 4.5V range. Designed with a p-channel  
MOSFET series pass transistor, the MAX8840/MAX8841/  
MAX8842 maintain very low ground current (40µA).  
♦ Low 40µA Ground Current  
♦ Excellent Load/Line Transient  
♦ Overcurrent and Thermal Protection  
The regulators are designed and optimized to work with  
low-value, low-cost ceramic capacitors. The MAX8840  
requires only 1µF (typ) of output capacitance for stability  
with any load. When disabled, current consumption drops  
to below 1µA.  
Ordering Information  
PART*  
TEMP RANGE  
PIN-PACKAGE  
The MAX8840/MAX8841/MAX8842 are available in a tiny  
1mm x 1.5mm x 0.8mm µDFN.  
6 µDFN-6  
1.5mm x 1.0mm  
MAX8840ELTxy+T  
-40°C to +85°C  
6 µDFN-6  
1.5mm x 1.0mm  
Applications  
Cellular and Cordless Phones  
PDA and Palmtop Computers  
Base Stations  
MAX8841ELTxy+T**  
MAX8842ELT+T**  
-40°C to +85°C  
-40°C to +85°C  
6 µDFN-6  
1.5mm x 1.0mm  
*xy is the output voltage code (see the Output Voltage Selector  
Guide). Other versions between 1.5V and 4.5V are available in  
100mV increments. Contact factory for other versions.  
Bluetooth Portable Radios and Accessories  
Wireless LANs  
Digital Cameras  
Personal Stereos  
**Future product—contact factory for availability.  
+Denotes lead-free package.  
Portable and Battery-Powered Equipment  
Output Voltage Selector Guide appears at end of data sheet.  
Typical Operating Circuits  
Pin Configuration  
TOP VIEW  
INPUT  
2V TO 6V  
OUTPUT PRESET  
1 5V TO 4 5V  
IN  
OUT  
BP  
OUT  
N.C.  
1
2
3
6
5
4
IN  
GND  
C
BP  
10nF  
C
IN  
MAX8840  
1μF  
MAX8840  
MAX8841  
MAX8842  
ON  
SHDN  
C
1μF  
OUT  
OFF  
GND  
BP (MAX8840)  
N.C. (MAX8841)  
FB (MAX8842)  
SHDN  
μDFN  
(1.5mm x 1.0mm)  
Typical Operating Circuits continued at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...10

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