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LM3677

更新时间： 2024-11-16 02:58:19
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3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

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LM3677  
www.ti.com  
SNVS502F –MARCH 2007–REVISED MAY 2013  
3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits  
Check for Samples: LM3677  
1
FEATURES  
APPLICATIONS  
2
•
16 µA typical quiescent current  
•
•
•
•
•
•
•
Mobile Phones  
PDAs  
•
•
•
•
600 mA maximum load capability  
3 MHz PWM fixed switching frequency (typ.)  
Automatic PFM/PWM mode switching  
MP3 Players  
W-LAN  
Available in 5-bump DSBGA package and 6-pin  
USON package  
Portable Instruments  
Digital Still Cameras  
Portable Hard Disk Drives  
•
Internal synchronous rectification for high  
efficiency  
•
•
•
•
Internal soft start  
DESCRIPTION  
The LM3677 step-down DC-DC converter is  
optimized for powering ultra-low voltage circuits from  
a single Li-Ion cell battery and input voltage rails from  
2.7V to 5.5V. It provides up to 600 mA load current  
over the entire input voltage range. The LM3677 is  
configured to different fixed voltage output options as  
well as an adjustable output voltage version range  
from 1.2V to 3.3V.  
0.01 µA typical shutdown current  
Operates from a single Li-Ion cell battery  
Only three tiny surface-mount external  
components required (solution size less than  
20 mm2)  
•
Current overload and thermal shutdown  
protection  
TYPICAL APPLICATION CIRCUITS  
V
IN  
L1: 1.0 mH  
V
OUT  
2.7V to 5.5V  
V
IN  
SW  
1
2
3
5
C
OUT  
C
IN  
LM3677  
10 mF  
4.7 mF  
GND  
EN  
FB  
4
Figure 1. Typical Application Circuit  
V
IN  
L1: 1.0 mH  
V
V
OUT  
2.7V to 5.5V  
IN  
SW  
1
2
3
5
C
C
LM3677-  
ADJ  
IN  
OUT  
R1  
R2  
C1  
C2  
4.7 mF  
10 mF  
GND  
EN  
FB  
4
Figure 3. Efficiency vs. Output Current  
(VOUT = 1.8V)  
Figure 2. Typical Application Circuit - ADJ.  
Version  
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.  
All trademarks are the property of their respective owners.  
2
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 © 2007–2013, Texas Instruments Incorporated  
 
 
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