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參數資料
| 型號： | LM2647MTC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Dual Synchronous Buck Regulator Controller |
| 中文描述： | DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | TSSOP-28 |
| 文件頁數： | 1/25頁 |
| 文件大小： | 763K |
| 代理商： | LM2647MTC |
LM2647
Dual Synchronous Buck Regulator Controller
General Description
The LM2647 is an adjustable 200-500kHz dual channel
voltage-mode controlled high-speed synchronous buck
regulator controller ideally suited for battery powered appli-
cations such as laptop and notebook computers. The
LM2647 requires only N-channel FETs for both the upper
and lower positions of each synchronous stage. It features
line feedforward to improve the response to input transients.
At very light loads, the user can choose between the high-
efficiency Pulse-skip mode or the constant frequency
Forced-PWM mode. Lossless current limiting without the use
of external sense resistors is made possible by sensing the
voltage drop across the bottom FET. A unique adaptive duty
cycle clamping technique is incorporated to significantly re-
duce peak currents under abnormal load conditions. The two
independently programmable outputs switch 180 out of
phase (interleaved switching) to reduce the input capacitor
and filter requirements. The input voltage range is 5.5V to
28V while the output voltages are adjustable down to 0.6V.
Standard supervisory and control features include Soft-start,
Power Good, output Under-voltage and Over-voltage protec-
tion, Under-voltage Lockout, Soft-shutdown and Enable.
Features
n
Input voltage range from 5.5V to 28V
n
Synchronous dual-channel Interleaved switching
n
Forced-PWM or Pulse-skip modes
n
Lossless bottom-side FET current sensing
n
Adaptive duty cycle clamping
n
High current N-channel FET drivers
n
Low shutdown supply currents
n
Reference voltage accurate to within
±
1.5%
n
Output voltage adjustable down to 0.6V
n
Power Good flag and Chip Enable
n
Under-voltage lockout
n
Over-voltage/Under-voltage protection
n
Soft-start and Soft-shutdown
n
Switching frequency adjustable 200kHz-500kHz
Applications
n
Notebook Chipset Power Supplies
n
Low Output Voltage High-Efficiency Buck Regulators
Typical Application (Channel 2 in parenthesis)
20056304
June 2003
D
2003 National Semiconductor Corporation
DS200563
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2647MTC/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 |
| LM2647MTCX | 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 |
| LM2647MTCX/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 |
| LM2648 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Two-Phase, Synchronous Step-Down 3-Channel Switching Regulator Controller |
| LM26480 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators |
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