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LM5143-Q1

更新时间： 2024-11-24 02:51:27
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德州仪器 - TI /
页数 文件大小 规格书
49页 2983K
描述
LM25149 42-V Synchronous Buck DC/DC Controller with Ultra-Low IQ and Integrated Active EMI Filter

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LM25149
SNVSBV5 – DECEMBER 2020  
LM25149 42-V Synchronous Buck DC/DC Controller with Ultra-Low IQ and Integrated  
Active EMI Filter  
1 Features  
2 Applications  
•
Two integrated EMI mitigation mechanisms  
– Active EMI filter for enhanced EMI performance  
at lower frequencies  
•
•
•
Building automation  
Industrial transport  
Wireless infrastructure  
– Dual random spread spectrum (DRSS) for  
enhanced EMI performance across low and  
high-frequency bands  
3 Description  
The LM25149 is a 42-V synchronous buck DC/DC  
controller for high-current single-output applications.  
Refer to the Errata. The device uses peak current-  
– EMI reduced by an average of 25 dBµV  
– Reduces the external differential-mode filter  
size by 50% and lowers systems cost  
Versatile synchronous buck DC/DC controller  
– Wide input voltage range of 3.5 V to 42 V  
– 1% accurate, fixed 3.3-V, 5-V, 12-V, or  
adjustable outputs from 0.8 V to 36 V  
– 150°C maximum junction temperature  
– Shutdown mode current: 2.2 µA  
mode  
control  
architecture  
for  
easy  
loop  
compensation, fast transient response, and excellent  
load and line regulation. The LM25149 can be set up  
in interleaved mode (paralleled output) with accurate  
current sharing for high-current applications. The  
LM25149 can operate at input voltages as low as 3.5  
V, at nearly 100% duty cycle if needed.  
•
The LM25149 has two unique EMI reduction features:  
active EMI Filter and Dual Random Spread Spectrum  
(DRSS). Active EMI filter senses any noise or ripple  
voltage on the DC input bus and injects an out-of-  
phase cancellation signal to reduce the noise or ripple  
voltage. DRSS combines a low-frequency triangular  
and high-frequency random modulation to optimize  
EMI preformance in the low-frequency and high-  
frequency radio frequency bands.  
– No-load standby current: 9 µA  
•
•
Switching frequency from 100 kHz to 2.2 MHz  
– SYNC in and SYNC out capability  
Inherent protection features for robust design  
– Internal hiccup-mode overcurrent protection  
– ENABLE and PGOOD functions  
– VCC, VDDA, and gate-drive UVLO protection  
– Internal or external loop compensation  
– Thermal shutdown protection with hysteresis  
Create a custom design using the LM25149 with  
WEBENCH® Power Designer  
Device Information  
PART NUMBER  
PACKAGE(1)  
BODY SIZE (NOM)  
•
LM25149  
VQFN (24)  
3.5 mm × 5.5 mm  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet  
CISPR 25 Class 5 Peak  
Start 150 kHz  
Stop 30 MHz  
CISPR 25 Class 5 Average  
Typical Application Schematic  
CISPR 25 EMI Performance 150 kHz ̶ 30 MHz  
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change  
without notice.  
 
 
 
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