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參數資料
| 型號： | LM2744 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller with External Reference |
| 中文描述： | 低壓N溝道MOSFET同步降壓穩壓控制器與外部參考 |
| 文件頁數： | 1/22頁 |
| 文件大小： | 663K |
| 代理商： | LM2744 |
LM2744
Low Voltage N-Channel MOSFET Synchronous Buck
Regulator Controller with External Reference
General Description
The LM2744 is a high-speed synchronous buck regulator
controller with an externally adjustable reference voltage
(between 0.5V to 1.5V). It can provide simple down conver-
sion to output voltages as low as 0.5V. Though the control
sections of the IC are rated for 3 to 6V, the driver sections
are designed to accept input supply rails as high as 16V. The
use of adaptive non-overlapping MOSFET gate drivers helps
avoid potential shoot-through problems while maintaining
high efficiency. The IC is designed for the more cost-effective
option of driving only N-channel MOSFETs in both the high-
side and low-side positions. It senses the low-side switch
voltage drop for providing a simple, adjustable current limit.
The fixed-frequency voltage-mode PWM control architecture
is adjustable from 50 kHz to 1 MHz with one external resis-
tor. This wide range of switching frequency gives the power
supply designer the flexibility to make better tradeoffs be-
tween component size, cost and efficiency.
Features include soft-start, input undervoltage lockout
(UVLO) and Power Good (based on both undervoltage and
overvoltage detection). In addition, the shutdown pin of the
IC can be used for providing startup delay, and the soft-start
pin can be used for implementing precise tracking, for the
purpose of sequencing with respect to an external rail.
Features
n
Power stage input voltage from 1V to 16V
n
Control stage input voltage from 3V to 6V
n
Output voltage adjustable down to 0.5V
n
Power good flag and shutdown
n
Output overvoltage and undervoltage detection
n
External reference voltage 0.5V to 1.5V
n
Low-side adjustable current sensing
n
Adjustable soft-start
n
Tracking and sequencing with shutdown and soft start
pins
n
Switching frequency from 50 kHz to 1 MHz
n
TSSOP-14 package
Applications
n
3.3V Buck Regulation
n
Cable Modem, DSL and ADSL
n
Laser Jet and Ink Jet Printers
n
Low Voltage Power Modules
n
DSP, ASIC, Core and I/O
Typical Application
20106001
ADVANCE INFORMATION
September 2004
L
R
2004 National Semiconductor Corporation
DS201060
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2744EVAL | 功能描述:電源管理IC開發工具 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 |
| LM2744MTC | 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 |
| LM2744MTC/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 |
| LM2744MTCX | 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 |
| LM2744MTCX/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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