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參數(shù)資料
| 型號： | LM3670 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | RECTIFIER STANDARD SINGLE 1A 100V 100 30A-ifsm 5uA-ir 1V-vf A405 5K/REEL-13 |
| 中文描述： | 微型降壓型DC - DC轉(zhuǎn)換器的超低電壓電路 |
| 文件頁數(shù)： | 1/17頁 |
| 文件大?。?/td> | 997K |
| 代理商： | LM3670 |
LM3670
Miniature Step-Down DC-DC Converter for Ultra Low
Voltage Circuits
General Description
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.
The device offers superior features and performance for
mobile phones and similar portable applications with com-
plex power management systems. Automatic intelligent
switching between PWM low-noise and PFM low-current
mode offers improved system control. During full-power op-
eration, a fixed-frequency 1 MHz (typ). PWM mode drives
loads from
～
70 mAto 350 mAmax, with up to 95% efficiency.
Hysteretic PFM mode extends the battery life through reduc-
tion of the quiescent current to 15 μA (typ) during light
current loads and system standby. Internal synchronous rec-
tification 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 con-
sumption to 0.1 μA (typ.).
The LM3670 is available in a SOT23-5 package. A high
switching frequency - 1 MHz (typ) - allows use of tiny
surface-mount components. Only three external surface-
mount components, an inductor and two ceramic capacitors,
are required.
Features
n
V
OUT
= adj (.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V
n
2.5V
≤
V
IN
≤
5.5V
n
15 μA typical quiescent current
n
350 mA maximum load capability
n
1 MHz PWM fixed switching frequency (typ.)
n
Automatic PFM/PWM mode switching
n
Available in fixed output voltages as well as an
adjustable version
n
SOT23-5 package
n
Low drop out operation - 100% duty cycle mode
n
Internal synchronous rectification for high efficiency
n
Internal soft start
n
0.1 μA typical shutdown current
n
Operates from a single Li-Ion cell or 3 cell NiMH/NiCd
batteries
n
Only three tiny surface-mount external components
required (one inductor, two ceramic capacitors)
n
Current overload protection
Applications
n
Mobile phones
n
Hand-Held Radios
n
Personal Digital Assistants
n
Palm-top PCs
n
Portable Instruments
n
Battery Powered Devices
Typical Application
20075801
FIGURE 1. 1.8V - Fixed Output Voltage - Typical Application Circuit
December 2004
L
2004 National Semiconductor Corporation
DS200758
www.national.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3671MF-1.875 | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
| LM3671MF-ADJ | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
| LM3671MFX-1.2 | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
| LM3671MFX-1.25 | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
| LM3671MFX-1.375 | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3670_06 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| LM3670B-0250 WAF | 制造商:Texas Instruments 功能描述: |
| LM3670MF-1.2 | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM3670MF-1.2/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM3670MF-1.2/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
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