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LM2640 bảng dữ liệu(PDF) 1 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM2640 Dual Adjustable Step-Down Switching Power Supply Controller
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LM2640
www.ti.com
SNVS019B – DECEMBER 1998 – REVISED APRIL 2013
LM2640 Dual Adjustable Step-Down Switching Power Supply Controller
Check for Samples: LM2640
1
FEATURES
DESCRIPTION
The LM2640 is a dual step-down power supply
2
200 kHz Fixed-Frequency Switching
controller
intended
for
application
in
notebook
Switching Synchronization with an External
personal
computers
and
other
battery-powered
Signal up to 400 kHz
equipment.
Optional Pulse-Skipping Mode
Fixed-frequency synchronous drive of logic-level N-
Adjustable Secondary Feedback
channel power MOSFETs is combined with an
optional pulse-skipping mode to achieve ultra efficient
Input Undervoltage Lockout
power conversion over a 1000:1 load current range.
Output Undervoltage Shutdown Protection
The pulse-skipping mode can be disabled in favor of
Output Overvoltage Shutdown Protection
fixed-frequency operation regardless of the load
Programmable Soft-Start (Each Controller)
current level.
5V, 50 mA Linear Regulator Output
High DC gain and current-mode feedback control
assure excellent line and load regulation and a wide
Precision 2.5V Reference Output
loop bandwidth for fast response to dynamic loads.
28-Pin Package
An internal oscillator fixes the switching frequency at
APPLICATIONS
200 kHz. Optionally, switching can be synchronized
to an external clock running as fast as 400 kHz.
Notebook and Subnotebook Computers
An optional soft-start feature limits current surges
Wireless Data Terminals
from the input power supply at start up and provides
Battery-Powered Instruments
a simple means of start-up sequencing.
Logic-level inputs allow the controllers to be turned
KEY SPECIFICATIONS
ON and OFF separately.
96% Efficient
5.5V to 30V Input Range
Dual Outputs Adjustable from 2.2V to 6V
0.5% Typical Load Regulation Error
0.002%/V Typical Line Regulation Error
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 1998–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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