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LM3489QMM/NOPB PDF预览

LM3489QMM/NOPB

更新时间： 2024-11-24 11:14:19
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德州仪器 - TI 控制器
页数 文件大小 规格书
27页 843K
描述
具有使能引脚的汽车级 4.5V 至 35V、滞环非同步 PFET 降压控制器 | DGK | 8 | -40 to 125

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LM3489QMM/NOPB 数据手册

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Sample &  
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LM3489, LM3489-Q1  
SNVS443C –MAY 2006–REVISED DECEMBER 2016  
LM3489x Hysteretic PFET Buck Controller With Enable Pin  
1 Features  
3 Description  
The LM3489 device is  
switching regulator controller that can be used to  
quickly and easily develop a small, cost-effective,  
switching buck regulator for  
applications. The hysteretic control architecture  
provides for simple design without any control loop  
stability concerns using a wide variety of external  
components. The PFET architecture also allows for  
low component count as well as ultra-low dropout,  
100% duty cycle operation. Another benefit is high  
efficiency operation at light loads without an increase  
in output ripple. A dedicated enable pin provides a  
shutdown mode drawing only 7 µA. Leaving the  
enable pin unconnected defaults to on.  
a high-efficiency PFET  
1
•
•
Qualified for Automotive Parts  
AEC-Q100 Qualified With the Following Results:  
–
Device Temperature Grade 1: –40°C to 125°C  
Ambient Operating Temperature Range  
a wide range of  
–
–
Device HBM ESD Classification Level 2  
Device CDM ESD Classification Level C5  
•
•
•
•
•
•
Easy-to-Use Control Methodology  
No Control Loop Compensation Required  
Wide 4.5-V to 35-V Input Range  
1.239 V to VIN Adjustable Output Range  
High Efficiency: 93%  
±1.3% (±2% Over Temperature) Internal  
Reference  
Current limit protection can be implemented by  
measuring the voltage across the PFET’s RDS(ON)  
,
thus eliminating the need for a sense resistor. A  
sense resistor may be used to improve current limit  
accuracy if desired. The cycle-by-cycle current limit  
can be adjusted with a single resistor, ensuring safe  
operation over a range of output currents.  
•
•
•
•
•
•
•
100% Duty Cycle Operation  
Maximum Operation Frequency > 1 MHz  
Current Limit Protection  
Dedicated Enable Pin (on if Unconnected)  
Shutdown Mode Draws Only 7-µA Supply Current  
8-Pin VSSOP Package  
Device Information(1)  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
LM3489  
LM3489-Q1  
VSSOP (8)  
3.00 mm × 3.00 mm  
2 Applications  
•
•
•
•
•
•
•
•
•
•
Set-Top Boxes  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
DSL or Cable Modems  
PC/IA  
Auto PCs  
TFT Monitors  
Battery-Powered Portable Applications  
Distributed Power Systems  
Always-On Power  
High-Power LED Drivers  
Automotive  
Typical Application Circuit  
L
C
R
ADJ  
ADJ  
V
+
V
IN  
Q1  
OUT  
R
IS  
7
D1  
1
R1  
R2  
C
ff  
PGATE  
ISENSE  
FB  
+
5
C
IN1  
C
OUT  
4
ADJ  
VIN  
EN  
LM3489  
8
3
2
GND  
PGND  
6
C
IN2  
Copyright © 2016, Texas Instruments Incorporated  
1
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. PRODUCTION DATA.  
 
 
 
 
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LM3489QMM/NOPB 替代型号

型号 品牌 替代类型 描述 数据表
LM3489QMMX/NOPB TI

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 具有使能引脚的汽车级 4.5V 至 35V、滞环非同步 PFET 降压控制器 | DGK

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