參數(shù)資料
型號(hào)： LM20144MHE
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 4A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator
中文描述： 6.6 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PDSO16
封裝： TSSOP-16
文件頁(yè)數(shù)： 1/20頁(yè)
文件大小： 744K
代理商： LM20144MHE
December 3, 2007
LM20144
4A, PowerWise
Adjustable Frequency Synchronous Buck
Regulator
General Description
The LM20144 is a full featured adjustable frequency syn-
chronous buck regulator capable of delivering up to 4A of
continuous output current. The current mode control loop can
be compensated to be stable with virtually any type of output
capacitor. For most cases, compensating the device only re-
quires two external components, providing maximum flexibil-
ity and ease of use. The device is optimized to work over the
input voltage range of 2.95V to 5.5V making it suited for a wide
variety of low voltage systems.
The device features internal over voltage protection (OVP)
and over current protection (OCP) circuits for increased sys-
tem reliability. A precision enable pin and integrated UVLO
allows the turn-on of the device to be tightly controlled and
sequenced. Start-up inrush currents are limited by both an
internally fixed and externally adjustable Soft-Start circuit.
Fault detection and supply sequencing is possible with the
integrated power good circuit.
The LM20144 is designed to work well in multi-rail power
supply architectures. The output voltage of the device can be
configured to track a higher voltage rail using the SS/TRK pin.
If the output of the LM20144 is pre-biased at startup it will not
sink current to pull the output low until the internal soft-start
ramp exceeds the voltage at the feedback pin.
The frequency of this device can be adjusted from 500 kHz to
1.5 MHz by connecting an external resistor from the RT pin
to ground.
The LM20144 is offered in a 16-pin eTSSOP package with an
exposed pad that can be soldered to the PCB, eliminating the
need for bulky heatsinks.
Features
■
Input voltage range 2.95V to 5.5V
■
Accurate current limit minimizes inductor size
■
97% peak efficiency
■
Adjustable switching frequency (500 kHz - 1.5 MHz)
■
32 m
integrated FET switches
■
Starts up into pre-biased loads
■
Output voltage tracking
■
Peak current mode control
■
Adjustable output voltage down to 0.8V
■
Adjustable Soft-Start with external capacitor
■
Precision enable pin with hysteresis
■
Integrated OVP, UVLO, power good and thermal
shutdown
■
eTSSOP-16 exposed pad package
Applications
■
Simple to design, high efficiency point of load regulation
from a 5V or 3.3V bus
■
High Performance DSPs, FPGAs, ASICs and
microprocessors
■
Broadband, Networking and Optical Communications
Infrastructure
Typical Application Circuit
30030601
PowerWise
is a registered trademark of National Semiconductor Corporation.
2007 National Semiconductor Corporation
300306
www.national.com
L
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM20144MHE/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM20144MHX 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 2.95V to 5.5V 16-Pin TSSOP EP T/R
LM20144MHX/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM20144QMH/NOPB 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A,PwrWise Adj Freq Sync Buck Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
LM20144QMHE/NOPB 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A,PwrWise Adj Freq Sync Buck Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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