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LM3677LEE-1.2

更新时间： 2024-11-15 03:09:15
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美国国家半导体 - NSC 转换器
页数 文件大小 规格书
22页 8119K
描述
3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

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LM3677LEE-1.2 数据手册

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February 28, 2008  
LM3677  
3MHz, 600mA Miniature Step-Down DC-DC Converter for  
Ultra Low Voltage Circuits  
General 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.  
Features  
16 µA typical quiescent current  
■
■
■
■
600 mA maximum load capability  
3 MHz PWM fixed switching frequency (typ.)  
Automatic PFM/PWM mode switching  
Available in 5-bump micro SMD package and 6-pin LLP  
■
package  
Internal synchronous rectification for high efficiency  
■
■
■
■
The device offers superior features and performance for mo-  
bile phones and similar portable applications with complex  
power management systems. Automatic intelligent switching  
between PWM low-noise and PFM low-current mode offers  
improved system control. During PWM mode operation, the  
device operates at a fixed frequency of 3 MHz (typ). PWM  
mode drives loads from ~ 80 mA to 600 mA max. Hysteretic  
PFM mode extends the battery life by reducing the quiescent  
current to 16 µA (typ.) during light load and standby operation.  
Internal synchronous rectification provides high efficiency. In  
shutdown mode (Enable pin pulled down), the device turns  
off and reduces battery consumption to 0.01 µA (typ.).  
Internal soft start  
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  
■
■
Applications  
Mobile Phones  
■
■
■
■
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PDAs  
The LM3677 is available in a lead-free (NOPB) 5-bump micro  
SMD package and 6-pin LLP package. A switching frequency  
of 3 MHz (typ.) allows use of tiny surface-mount components.  
Only three external surface-mount components, an inductor  
and two ceramic capacitors, are required.  
MP3 Players  
W-LAN  
Portable Instruments  
Digital Still Cameras  
Portable Hard Disk Drives  
Typical Application Circuit  
Efficiency vs. Output Current  
(VOUT = 1.8V)  
30008401  
FIGURE 1. Typical Application Circuit  
30008487  
© 2008 National Semiconductor Corporation  
300084  
www.national.com  
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