參數(shù)資料
型號： CRCW12063923F
廠商： National Semiconductor Corporation
英文描述： N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages
中文描述： N溝道場效應(yīng)管同步降壓穩(wěn)壓控制器輸出電壓低
文件頁數(shù)： 1/22頁
文件大小： 602K
代理商： CRCW12063923F
LM2727/LM2737
N-Channel FET Synchronous Buck Regulator Controller
for Low Output Voltages
General Description
The LM2727 and LM2737 are high-speed, synchronous,
switching regulator controllers. They are intended to control
currents of 0.7A to 20A with up to 95% conversion efficien-
cies. The LM2727 employs output over-voltage and under-
voltage latch-off. For applications where latch-off is not de-
sired, the LM2737 can be used. Power up and down
sequencing is achieved with the power-good flag, adjustable
soft-start and output enable features. The LM2737 and
LM2737 operate from a low-current 5V bias and can convert
from a 2.2V to 16V power rail. Both parts utilize a fixed-
frequency, voltage-mode, PWM control architecture and the
switching frequency is adjustable from 50kHz to 2MHz by
adjusting the value of an external resistor. Current limit is
achieved by monitoring the voltage drop across the on-
resistance of the low-side MOSFET, which enhances low
duty-cycle operation. The wide range of operating frequen-
cies gives the power supply designer the flexibility to fine-
tune component size, cost, noise and efficiency. The adap-
tive, non-overlapping MOSFET gate-drivers and high-side
bootstrap structure helps to further maximize efficiency. The
high-side power FET drain voltage can be from 2.2V to 16V
and the output voltage is adjustable down to 0.6V.
Features
n
Input power from 2.2V to 16V
n
Output voltage adjustable down to 0.6V
n
Power Good flag, adjustable soft-start and output enable
for easy power sequencing
n
Output over-voltage and under-voltage latch-off
(LM2727)
n
Output over-voltage and under-voltage flag (LM2737)
n
Reference Accuracy: 1.5% (0C - 125C)
n
Current limit without sense resistor
n
Soft start
n
Switching frequency from 50 kHz to 2 MHz
n
TSSOP-14 package
Applications
n
Cable Modems
n
Set-Top Boxes/ Home Gateways
n
DDR Core Power
n
High-Efficiency Distributed Power
n
Local Regulation of Core Power
Typical Application
20049410
June 2003
L
2003 National Semiconductor Corporation
DS200494
www.national.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CRCW1206-3923FRT1 制造商:Vishay Dale 功能描述:392K ohm SMD (Surface Mount) Thick Film Resistor 1206 1% 1/4W 100ppm 制造商:Vishay Dale 功能描述:392K ohm SMD (Surface Mount) Thick Film Resistor 1206 1% 1/4W 100ppm - free partial T/R at 500.
CRCW1206392JRT1 制造商:Vishay Dale 功能描述: 制造商:Vishay Intertechnologies 功能描述:
CRCW1206-392JRT1 制造商:Vishay Dale 功能描述:3.9K ohm SMD (Surface Mount) Thick Film Resistor 1206 5% 1/4W 200ppm - free partial T/R at 500.
CRCW1206392KFHEAP 功能描述:RES SMD 392K OHM 1% 1/4W 1206 制造商:vishay dale 系列:CRCW-P 包裝:帶卷（TR） 零件狀態(tài):有效 電阻（歐姆）:392k 容差:±1% 功率（W）:0.25W，1/4W 成分:厚膜 特性:汽車級 AEC-Q200 溫度系數(shù):±50ppm/°C 工作溫度:-55°C ~ 155°C 封裝/外殼:1206（3216 公制） 供應(yīng)商器件封裝:1206 大小/尺寸:0.126" 長 x 0.063" 寬（3.20mm x 1.60mm） 高度:0.024"（0.60mm） 端子數(shù):2 標(biāo)準(zhǔn)包裝:5,000
CRCW1206392KFKEA 功能描述:厚膜電阻器 - SMD 1/4watt 392Kohms 1% RoHS:否 制造商:Bourns 電阻:1.5 Ohms 容差:1 % 功率額定值:25 W 電壓額定值:250 V 外殼代碼 - in: 外殼代碼 - mm: 端接類型:SMD/SMT 溫度系數(shù):100 PPM / C 系列:PWR163 工作溫度范圍:- 55 C to + 155 C 封裝:Tube
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