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LM8801_15

更新时间： 2024-11-03 00:55:11
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德州仪器 - TI /
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23页 1629K
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High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications

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LM8801_15 数据手册

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LM8801  
www.ti.com  
SNVS597H –APRIL 2009–REVISED MAY 2013  
LM8801 High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for  
Mobile Applications  
Check for Samples: LM8801  
1
FEATURES  
APPLICATIONS  
2
•
Over 90% Efficiency at 6 MHz Operation  
600 mA Maximum Load Capability  
•
•
•
•
•
Mobile Phones  
•
•
•
•
•
•
MP3 players  
6 MHz PWM Fixed Switching Frequency (typ.)  
27 µA (typ.) Quiescent Current in PFM Mode  
Wide Input Voltage Range: 2.3V to 5.5V  
VOUT = 1.0V to 2.9V with 50 mV steps  
Wireless LAN  
PDAs, Pocket PCs  
Portable Hard Disk Drives  
DESCRIPTION  
±1.5% DC Output Voltage Precision Over  
Temperature  
The LM8801 step-down DC-DC converter is  
optimized for powering ultra-low voltage circuits from  
a single Li-Ion cell and input voltage rails from 2.3V to  
5.5V. It provides up to 600 mA load current over the  
entire input voltage range.  
•
•
•
•
Best-in-Class Load Transient Response  
Low Output Ripple in PFM Mode  
Automatic PFM/PWM Mode Switching  
Current Overload and Thermal Shutdown  
Protection  
The LM8801 has a mode-control pin that allows the  
user to select continuous PWM operation over the  
complete load range or an auto PFM-PWM mode that  
changes modes automatically depending on the load.  
During PWM mode, the device operates at a fixed-  
frequency of 6 MHz (typ.). In Auto PFM-PWM mode,  
hysteretic PFM extends the battery life through  
reduction of the quiescent current during light loads  
and system standby.  
•
•
Internal Soft-Start  
6-bump DSBGA Package  
–
(1.065 x 1.265 , 0.6 mm or 0.25 mm height)  
•
•
Total Solution Size < 7mm2 (works with 0402  
capacitors)  
UVLO  
The LM8801 is available in a 6-bump DSBGA  
package. Only three compact external surface-mount  
components, an inductor and two capacitors, are  
required.  
Efficiency vs. Output Current  
(Auto Mode, VOUT = 1.82V)  
Typical Application Circuit  
100  
90  
80  
4.2V  
70  
60  
50  
40  
30  
20  
10  
0
C
= 4.7 µF, TDK  
OUT  
L = 0.5 µH, FDK  
10 100  
OUTPUT CURRENT (mA)  
0.1  
1
1000  
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.  
2
All trademarks are the property of their respective owners.  
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 © 2009–2013, Texas Instruments Incorporated  
1234567...23

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