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參數(shù)資料
| 型號： | LM2651-1.8MWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | WAFER |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 297K |
| 代理商： | LM2651-1.8MWC |
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
LM2651
an
ideal
fit
in
battery-powered applications that demand long battery life in
both run and standby modes.
Synchronous rectification is used to achieve up to 97%
efficiency. At light loads, the LM2651 enters a low power
hysteretic or “sleep” mode to keep the efficiency high. In
many applications, 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 10A.
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.
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
7A 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
10092515
Efficiency vs Load Current
(V
IN = 5V, VOUT = 3.3V
10092501
March 2001
LM2651
1.5A
High
Efficiency
Synchronous
Switching
Regulator
2001 National Semiconductor Corporation
DS100925
www.national.com
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