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LM3678

更新时间： 2024-11-16 11:14:07
品牌 Logo 应用领域
德州仪器 - TI 便携式转换器
页数 文件大小 规格书
19页 1978K
描述
用于便携式应用的高性能、微型 1.5A 降压直流/直流转换器

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LM3678 数据手册

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LM3678  
www.ti.com  
SNVS464C –APRIL 2008–REVISED MAY 2013  
High-Performance Miniature 1.5-A Step-Down DC-DC Converter for Handheld Applications  
Check for Samples: LM3678  
1
FEATURES  
DESCRIPTION  
The LM3678 step-down DC-DC converter is  
optimized for powering low-voltage circuits from a  
single Li-Ion cell battery and input voltage rails from  
2.5 V to 5.5 V. It provides up to 1.5-A load current,  
over the entire input voltage range. LM3678 offers a  
0.8V or 1.2V option. One of the pair of voltages is set  
through the VSELECT pin.  
2
•
VOUT = 0.8 V or 1.2 V  
•
•
•
VIN = 2.5 V to 5.5 V  
1.5-A Maximum Load Capability  
3.3-MHz (Typical) PWM Fixed Switching  
Frequency Allows Use of 1-µH Inductor  
•
•
•
±3% DC Output Voltage Precision  
0.01-µA (Typical) Shutdown Current  
LM3678 operates in PWM mode with  
a fixed  
frequency of 3.3 MHz. Internal synchronous  
rectification provides high efficiency during PWM  
mode operation. In shutdown mode, the device turns  
off and reduces battery consumption to 0.01 µA  
(typical).  
Internal Synchronous Rectification for High  
Efficiency  
•
•
Internal Soft Start  
Current Overload and Thermal Shutdown  
Protection  
The LM3678 is available in a 3mm x 3mm DSC-10  
package. A high switching frequency of 3.3 MHz  
(typical) allows use of tiny surface-mount  
components. Only three external surface-mount  
components, an inductor and two ceramic capacitors,  
are required (solution size less than 33 mm2). For  
voltages other than the voltage shown, contact TI or  
your distributor.  
APPLICATIONS  
•
•
•
•
•
•
PDAs and Smart Phones  
Personal Media Players  
W-LAN  
USB Modem Applications  
Digital Still Cameras  
Portable Hard Disk Drives  
Efficiency vs. Output Current  
( VOUT = 1.2V)  
Typical Application Circuit  
1 mH  
V
= 2.5V to 5.5V  
IN  
V
VDD  
VDD  
OUT  
SW  
FB  
CIN  
10 mF  
22 mF  
C
OUT  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
0.8V/1.2V  
VSELECT  
EN  
LM3678  
PWM  
PGOOD  
GND  
GND  
NOTE: VSEL H = 1.2V, VSEL L = 0.8V  
0.100  
0.010  
1.000  
LOAD (A)  
10.000  
Figure 1.  
Figure 2.  
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 © 2008–2013, Texas Instruments Incorporated  
 
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