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參數資料
| 型號： | LM1770UMF |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 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： | 1/14頁 |
| 文件大小： | 687K |
| 代理商： | LM1770UMF |
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 |
|---|---|
| LM1770UMFX | SOT-23 Synchronous Buck Controller |
| LM1770SMF | SOT-23 Synchronous Buck Controller |
| LM1770SMFX | SOT-23 Synchronous Buck Controller |
| LM1770TMF | SOT-23 Synchronous Buck Controller |
| LM1770 | SOT-23 Synchronous Buck Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM1770UMF/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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM1770UMFX | 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM1770UMFX/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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM1771 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation |
| LM1771_0608 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation |
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