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LM3686

更新时间： 2024-11-16 11:12:51
品牌 Logo 应用领域
德州仪器 - TI 转换器稳压器
页数 文件大小 规格书
29页 2325K
描述
具有集成后置线性稳压器系统和低噪声线性稳压器的降压直流/直流转换器

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LM3686 数据手册

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Sample &  
Buy  
Support &  
Community  
Product  
Folder  
Tools &  
Software  
Technical  
Documents  
LM3686  
SNVS520F –AUGUST 2008–REVISED NOVEMBER 2016  
LM3686 Step-Down DC-DC Converter With Integrated Post Linear Regulators System And  
Low-Noise Linear Regulator  
1 Features  
2 Applications  
1
•
DC-DC Regulator  
•
•
•
•
Mobile TVs, Hand-Held Radios  
Personal Digital Assistants, Palm-Top PCs  
Portable Instruments and Personal Clients  
Battery-Powered Devices  
–
–
–
VOUT_DCDC = 1.2 V to 2.5 V  
600-mA Maximum ILOAD  
3-MHz Typical PWM Fixed Switching  
Frequency  
3 Description  
–
–
–
Automatic PFM/PWM Mode Switching  
Internal Synchronous Rectification  
Internal Soft Start  
The LM3686 is a step-down DC-DC converter with a  
very low-dropout linear regulator and a low-noise  
linear regulator optimized for powering ultra-low  
voltage circuits. It provides three outputs with  
combined load current up to 900 mA over an input  
voltage range from 2.7 V to 5.5 V.  
•
•
•
Dual-Rail Linear Regulator: LILO  
–
–
–
–
Load Transients < 50-mV Peak Typical  
Line Transients < 1-mV Peak Typical  
VOUT_LILO = 0.7 V to 2 V  
The device offers superior features and performance  
for many applications. Automatic intelligent switching  
between PWM low-noise and PFM low-current mode  
offers improved system control. During full-power  
operation, a fixed-frequency 3 MHz (typical), PWM  
mode drives loads from approximately 70 mA to 600  
mA maximum. Hysteretic PFM mode extends the  
battery life through reduction of the quiescent current  
to 28 μA (typical) at light load and system standby.  
Internal synchronous rectification provides high  
efficiency.  
70-µA Typical IQ and 300-mA Maximum ILOAD  
Linear Regulator: LDO  
–
–
–
–
Load Transients < 80-mV Peak Typical  
Line Transients < 1-mV Peak Typical  
VOUT_LDO = 1.5 V to 3.3 V  
50-µA Typical IQ and 350-mA Maximum ILOAD  
Combined Global Features  
–
–
VBATT ≥ Maximum (VOUT_LILO + 1.5 V, 2.7 V)  
Device Information(1)  
Operates From a Single Li-Ion Cell or 3-Cell  
NiMH/NiCd Batteries  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
LM3686  
DSBGA (12)  
2.435 mm × 1.687 mm  
–
100-µA IQ and 900-mA Maximum ILOAD  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
Typical Application  
V
BATT  
2.7 V to 5.5 V  
4.7 mF, 0603  
EN_DCDC  
PGND  
LM3686  
3 MHz  
DC-DC  
1 mH  
1.8 V  
SW  
FB_DCDC  
V
IN_LILO  
10 mF  
0603  
PGND  
LILO  
EN_LILO  
EN_LDO  
PGND  
Dual Rail  
LILO  
350 mA  
0.7 V to 2 V  
2.2 mF,  
0402  
350 mA  
QGND  
VIN_LDO  
LDO  
1.2 V to 3.3 V  
Linear Regulator  
300 mA  
300 mA  
1 mF,  
0402  
1 mF, 0402  
QGND  
QGND  
QGND  
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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