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參數資料
| 型號： | LM27241 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Synchronous Buck Regulator Controller for Mobile Systems |
| 中文描述： | 同步降壓穩壓控制器，用于移動通信系統 |
| 文件頁數： | 1/27頁 |
| 文件大小： | 1336K |
| 代理商： | LM27241 |
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LM27241
Synchronous Buck Regulator Controller for Mobile
Systems
General Description
The LM27241 is an adjustable 200kHz-500kHz single chan-
nel voltage-mode controlled high-speed synchronous buck
regulator controller. It is ideally suited for battery powered
applications such as laptop and notebook computers. The
LM27241 requires only N-channel FETs for both the upper
and lower positions of the 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 resistor 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
input voltage range is 5.5V to 28V while the output voltage is
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
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
See
Figure 17
for Expanded View
20120104
May 2005
L
2005 National Semiconductor Corporation
DS201201
www.national.com
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PDF描述 |
|---|---|
| LM27241MTC | Synchronous Buck Regulator Controller for Mobile Systems |
| LM27241MTCX | Synchronous Buck Regulator Controller for Mobile Systems |
| LM2746 | Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller |
| LM2746MXA | Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller |
| LM2746MXAX | Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM27241MTC | 制造商:Texas Instruments 功能描述:PWM CONTROLLER SMD 27241 TSSOP20 |
| LM27241MTC/NOPB | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LM27241MTCX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Synchronous Buck Regulator Controller for Mobile Systems |
| LM27241MTCX/NOPB | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產品目錄頁面:1316 (CN2011-ZH PDF) |
| LM27243A E WAF | 制造商:Texas Instruments 功能描述: |
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