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參數(shù)資料
型號: LM1770SMF
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: SOT-23 Synchronous Buck Controller
中文描述: SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO5
封裝: SOT-23, 5 PIN
文件頁數(shù): 1/14頁
文件大小: 687K
代理商: LM1770SMF
LM1770
SOT-23 Synchronous Buck Controller
General Description
The LM1770 is an efficient synchronous buck switching con-
troller in a tiny SOT23 package. The constant on-time control
scheme provides a simple design free of compensation com-
ponents, allowing minimal component count and board
space. It also incorporates a unique input feed-forward to
maintain a constant frequency independent of the input volt-
age. The LM1770 is optimized for a low voltage input range
of 2.8V to 5.5V and can provide an adjustable output as low
as 0.8V. Driving an external high side PFET and low side
NFET it can provide efficiencies as high as 95%.
Three versions of the LM1770 are available depending on
the switching frequency desired for the application. Nominal
switching frequencies are in the range of 100kHz to
1000kHz.
Features
n
Input voltage range of 2.8V to 5.5V
n
0.8V reference voltage
n
No compensation required
n
Constant frequency across input range
n
Low quiescent current of 400μA
n
Internal soft-start
n
Short circuit protection
n
Tiny SOT-23 package
Applications
n
Simple To Design, High Efficiency Step Down Switching
Regulators
n
Set-Top Boxes
n
Cable Modems
n
Printers
n
Digital Video Recorders
n
Servers
Typical Application Circuit
20166201
September 2005
L
2005 National Semiconductor Corporation
DS201662
www.national.com
相關PDF資料
PDF描述
LM1770SMFX SOT-23 Synchronous Buck Controller
LM1770TMF SOT-23 Synchronous Buck Controller
LM1770 SOT-23 Synchronous Buck Controller
LM1770TMFX SOT-23 Synchronous Buck Controller
LM2002 CONN HEADER 18POS .100 VERT GOLD
相關代理商/技術參數(shù)
參數(shù)描述
LM1770SMF/NOPB 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK
LM1770SMFX 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK
LM1770SMFX/NOPB 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK
LM1770TMF 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK
LM1770TMF/NOPB 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK
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