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參數(shù)資料
| 型號： | LM3670MFX-1.8 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| 中文描述： | 0.75 A SWITCHING REGULATOR, 1300 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 1/17頁 |
| 文件大小： | 997K |
| 代理商： | LM3670MFX-1.8 |
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 |
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| LM3670MFX-1.875 | Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| LM3670MFX-2.5 | Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| LM3670MFX-3.3 | Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| LM3670MFX-ADJ | Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| LM3670MF-2.5 | Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3670MFX-2.5 | 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 |
| LM3670MFX-2.5/NOPB | 功能描述:IC REG BUCK 2.5V 0.35A SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:PowerWise® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| LM3670MFX-3.3 | 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 |
| LM3670MFX-3.3/NOPB | 功能描述:IC REG BUCK 3.3V 0.35A SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:PowerWise® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| LM3670MFX-ADJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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