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參數(shù)資料
| 型號： | LM20123MH |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3A, 1.5MHz PowerWise㈢ Synchronous Buck Regulator |
| 中文描述： | 5.3 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 494K |
| 代理商： | LM20123MH |
November 1, 2007
LM20123
3A, 1.5MHz PowerWise
Synchronous Buck Regulator
General Description
The LM20123 is a full featured 1.5 MHz synchronous buck
regulator capable of delivering up to 3A 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 requires two ex-
ternal components, providing maximum flexibility 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 LM20123 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 LM20123 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 LM20123 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
■
96% efficiency with 1.5 MHz switching frequency
■
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
30030101
PowerWise
is a registered trademark of National Semiconductor Corporation.
2007 National Semiconductor Corporation
300301
www.national.com
L
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM20123MHE | 3A, 1.5MHz PowerWise㈢ Synchronous Buck Regulator |
| LM20123MHX | 3A, 1.5MHz PowerWise㈢ Synchronous Buck Regulator |
| LM20124 | 4A, 1MHz PowerWise㈢ Synchronous Buck Regulator |
| LM20124MH | 4A, 1MHz PowerWise㈢ Synchronous Buck Regulator |
| LM20124MHE | 4A, 1MHz PowerWise㈢ Synchronous Buck Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM20123MH/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 |
| LM20123MHE | 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 |
| LM20123MHE/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 |
| LM20123MHX | 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 |
| LM20123MHX/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 |
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