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參數資料
| 型號： | LM2743 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V |
| 中文描述： | N溝道場效應管同步降壓穩壓控制器，用于從3.3V轉換 |
| 文件頁數： | 1/23頁 |
| 文件大小： | 653K |
| 代理商： | LM2743 |
LM2743
N-Channel FET Synchronous Buck Regulator Controller
for Conversion from 3.3V
General Description
The LM2743 is a high-speed, N-Channel synchronous buck
regulator controller with a 2%, 0.6V feedback reference volt-
age intended to make down conversion from 3.3V to as low
as 0.6V easy. A fixed-frequency voltage-mode PWM control
architecture is used, that is adjustable from 50kHz to 2MHz
through an external resistor. This wide range of PWM fre-
quencies gives the power supply designer the flexibility to
make tradeoffs among component size, cost, noise and
efficiency. The power MOSFETs can run on a separate 1V to
16V (Input Voltage, V
) (Note 2) rail while the regulator is
biased from a 3V to 6V (IC Input Voltage, V
), 2mA rail. A
power-good flag, precision shutdown threshold and soft start
features make power supply tracking and sequencing easy.
The LM2743 employs output under-voltage and over-voltage
flag, and current limit. Current limit is achieved by monitoring
the voltage drop across the on resistance of the low-side
MOSFET. The adaptive non-overlapping MOSFET gate driv-
ers help avoid potential shoot-through problems while main-
taining high efficiency. Both high-side and low-side MOS-
FETs are the lower cost N-Channel type, and the IC can
accept a bootstrap structure to saturate the high-side MOS-
FET for highest efficiency.
Features
n
MOSFET input voltage (V
IN
) from 1V to 16V (Note 2)
n
IC input voltage (V
CC
) from 3V to 6V
n
Output voltage adjustable down to 0.6V
n
Power good flag and output enable
n
Output over-voltage and under-voltage flag
n
FB voltage: 2% over temperature
n
Current limit without series sense resistor
n
Adjustable soft start
n
Tracking and sequencing with shutdown and soft start
pins
n
Switching frequency from 50 kHz to 2 MHz
n
TSSOP-14 package
Applications
n
3.3V Buck Regulation
n
Set-Top Boxes/ Home Gateways
n
Core Logic Regulators
n
High-Efficiency Buck Regulation
Typical Application
20095201
April 2004
L
2004 National Semiconductor Corporation
DS200952
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2743-19AEVAL | 功能描述:電源管理IC開發工具 LM2743 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2743EVAL | 功能描述:BOARD EVALUATION LM2743 RoHS:否 類別:編程器，開發系統 >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2743EVAL/NOPB | 功能描述:電源管理IC開發工具 LM2743 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2743MTC | 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 |
| LM2743MTC/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 |
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