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參數(shù)資料
| 型號(hào)： | LM2651MTC-3.3 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 222K |
| 代理商： | LM2651MTC-3.3 |
LM2651
1.5A High Efficiency Synchronous Switching Regulator
General Description
The LM2651 switching regulator provides high efficiency
power conversion over a 100:1 load range (1.5A to 15mA).
This
feature
makes
the
battery-powered applications that demand long battery life in
both run and standby modes.
Synchronous rectification is used to achieve up to 97% effi-
ciency.At light loads, the LM2651 enters a low power hyster-
etic or “sleep” mode to keep the efficiency high. In many ap-
plications, the efficiency still exceeds 80% at 15mA load. A
shutdown pin is available to disable the LM2651 and reduce
the supply current to less than 10μA.
The LM2651 contains a patented current sensing circuitry for
current mode control. This feature eliminates the external
current sensing resistor required by other current-mode
DC-DC converters.
The LM2651 has a 300 kHz fixed frequency internal oscilla-
tor. The high oscillator frequency allows the use of extremely
small, low profile components.
A programmable soft-start feature limits current surges from
the input power supply at start up and provides a simple
means of sequencing multiple power supplies.
Other protection features include input undervoltage lockout,
current limiting, and thermal shutdown.
LM2651
an
ideal
fit
in
Features
n
Ultra high efficiency up to 97%
n
High efficiency over a 1.5A to milliamperes load range
n
4V to 14V input voltage range
n
1.8V, 2.5V, 3.3V, or ADJ output voltage
n
Internal MOSFET switch with low R
DS(on)
of 75m
n
300kHz fixed frequency internal oscillator
n
7μA shutdown current
n
Patented current sensing for current mode control
n
Input undervoltage lockout
n
Adjustable soft-start
n
Current limit and thermal shutdown
n
16-pin TSSOP package
Applications
n
Personal digital assistants (PDAs)
n
Computer peripherals
n
Battery-powered devices
n
Handheld scanners
n
High efficiency 5V conversion
Typical Application
DS100925-15
Efficiency vs Load Current
(V
IN
= 5V, V
OUT
= 3.3V)
DS100925-1
February 2000
L
2000 National Semiconductor Corporation
DS100925
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2651MTC-ADJ | 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 |
| LM2651MTC-ADJ | 制造商:Texas Instruments 功能描述:SWITCHING REG 1.5A ADJ SMD 2651 |
| LM2651MTC-ADJ/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5A HIGH EFFICIENCY SWITCHING REG 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 |
| LM2651MTCX-1.8 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.5A High Efficiency Synchronous Switching Regulator |
| LM2651MTCX-1.8/J7001113 | 制造商:Texas Instruments 功能描述: |
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