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LM3670MF-ADJ

更新时间： 2024-11-15 02:58:19
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德州仪器 - TI /
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Miniature Step-Down DC-DC Converter for Ultralow Voltage Circuits

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LM3670MF-ADJ 数据手册

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LM3670  
www.ti.com  
SNVS250E –NOVEMBER 2004–REVISED FEBRUARY 2013  
LM3670 Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits  
Check for Samples: LM3670  
1
FEATURES  
APPLICATIONS  
2
•
VOUT = Adj (0.7V min), 1.2, 1.5, 1.6, 1.8, 1.875,  
2.5, 3.3V  
•
•
•
•
•
•
Mobile Phones  
HandHeld  
•
•
•
•
•
•
2.5V ≤ VIN ≤ 5.5V  
PDAs  
15 µA Typical Quiescent Current  
350 mA Maximum Load Capability  
1 MHz PWM Fixed Switching Frequency (typ.)  
Automatic PFM/PWM Mode Switching  
Palm-Top PCs  
Portable Instruments  
Battery Powered Devices  
DESCRIPTION  
Available in Fixed Output Voltages as well as  
an Adjustable Version  
The LM3670 step-down DC-DC converter is  
optimized for powering ultra-low voltage circuits from  
a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It  
provides up to 350 mA load current, over an input  
voltage range from 2.5V to 5.5V. There are several  
different fixed voltage output options available as well  
as an adjustable output voltage version.  
•
•
SOT-23-5 Package  
Low Drop Out Operation - 100% Duty Cycle  
Mode  
•
Internal Synchronous Rectification for High  
Efficiency  
•
•
•
Internal Soft Start  
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 system  
control. During full-power operation, a fixed-frequency  
1 MHz (typ). PWM mode drives loads from ∼70 mA to  
350 mA max, with up to 95% efficiency. Hysteretic  
PFM mode extends the battery life through reduction  
of the quiescent current to 15 µA (typ) during light  
current loads and system standby. Internal  
synchronous rectification provides high efficiency (90  
to 95% typ. at loads between 1 mA and 100 mA). In  
shutdown mode (Enable pin pulled low) the device  
turns off and reduces battery consumption to 0.1 µA  
(typ.).  
0.1 µA Typical Shutdown Current  
Operates from a Single Li-Ion Cell or 3 Dell  
NiMH/NiCd Batteries  
•
•
Only Three Tiny Surface-Mount External  
Components Required (One Inductor, Two  
Ceramic Capacitors)  
Current Overload Protection  
Typical Application  
VIN  
L1:10uH  
2.5V to 5.5V  
VOUT  
VIN  
SW  
1
5
COUT  
10uF  
CIN  
4.7uF  
LM3670  
GND  
2
FB  
EN  
3
4
Figure 1. Fixed Output Voltage  
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.  
All trademarks are the property of their respective owners.  
2
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 © 2004–2013, Texas Instruments Incorporated  
 
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LM3670MF-ADJ 替代型号

型号 品牌 替代类型 描述 数据表
LM3670MF-ADJ/NOPB TI

类似代替

 LM3670 Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670MF-ADJ/NOPB NSC

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