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LM3687TL-1812/NOPB PDF预览

LM3687TL-1812/NOPB

更新时间： 2024-11-16 11:15:23
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
30页 1421K
描述
具有集成低压降稳压器和启动模式的降压直流/直流转换器 | YZR | 9

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LM3687TL-1812/NOPB 数据手册

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LM3687  
www.ti.com  
SNVS473B –DECEMBER 2007–REVISED MAY 2013  
LM3687 Step-Down DC-DC Converter with Integrated Low Dropout Regulator and Startup  
Mode  
Check for Samples: LM3687  
1
FEATURES  
APPLICATIONS  
2
DC-DC Converter:  
•
•
•
•
•
•
Mobile Phones  
•
•
750mA Maximum Load Capability  
Hand-Held Radios  
1.8MHz PWM Fixed Switching Frequency  
(Typ.)  
Personal Digital Assistants  
Palm-top PCs  
•
•
•
Automatic PFM/PWM Mode Switching  
27µA typ. Quiescent Current  
Portable Instruments  
Battery Powered Devices  
Internal Synchronous Rectification for High  
Efficiency  
DESCRIPTION  
The LM3687 is a step-down DC-DC converter with an  
integrated low dropout Linear Regulator optimized for  
powering ultra-low voltage circuits from a single Li-Ion  
cell or 3 cell NiMH/NiCd batteries. It provides a dual  
output with fixed output voltages and combined load  
current up to 750mA in post regulation mode or  
1100mA in independent mode of operation, over an  
input voltage range from 2.7V to 5.5V. There are  
several different fixed output voltage combinations  
available (refer to Voltage Options).  
•
Internal Soft Start  
Dual Rail Linear Regulator:  
Startup Mode  
•
•
•
•
Load Transients < 25mVpeak Typ.  
Line Transients < 1mVpeak Typ.  
Very Low Dropout Voltage: 82mV Typ. at  
350mA Load Current  
•
•
•
0.7V ≤ VIN_LIN ≤ 4.5V  
10µA Typical IQ from VIN_LIN  
350mA Maximum Load Capability  
Combined Common Features:  
The Linear Regulator being driven from the fixed  
output voltage of the buck converter (post regulation)  
translates to high efficiency.  
The device offers superior features and performance  
for mobile phones and similar portable applications  
with complex power management systems. Automatic  
intelligent switching between PWM low-noise and  
PFM low-current mode offers improved efficiency  
over the full load current range. During full-power  
operation, a fixed-frequency 1.8MHz (typ.) PWM  
mode drives loads from ~80mA to 750mA max.  
Hysteretic PFM mode extends the battery life through  
reduction of the quiescent current during light loads  
and system standby.  
•
•
65µA typical Quiescent Current from VBATT if  
Both Regulators are Enabled  
750mA Maximum Combined Load Capability in  
Post Regulation Setup (DC-DC 400mA + Linear  
Regulator 350mA)  
•
1100mA Maximum Total Load Capability in  
Independent Mode of Operation (DC-DC:  
750mA, Linear Regulator: 350mA)  
•
•
Operates from a Single Li-Ion Cell or 3 Cell  
NiMH/NiCd Batteries  
The LM3687 also features internal protection against  
over-temperature, current overload and under-voltage  
conditions.  
Only Four Tiny Surface-Mount External  
Components Required (One Inductor, Three  
Ceramic Capacitors)  
•
•
Small 9-Bump DSBGA Package  
Over-Temperature, Current Overload and  
Under-Voltage Protection  
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.  
2
All trademarks are the property of their respective owners.  
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 © 2007–2013, Texas Instruments Incorporated  
1234567...30

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LM3687TL-1812/NOPB 替代型号

型号 品牌 替代类型 描述 数据表
LM3687TLX-1812/NOPB TI

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