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LM2641 Datasheet

  • LM2641

  • Dual Adjustable Step-Down Switching Power Supply Controller

  • 19頁

  • NSC

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LM2641 Dual Adjustable Step-Down Switching Power Supply Controller
January 2000
LM2641
Dual Adjustable Step-Down Switching Power Supply
Controller
General Description
The LM2641 is a dual step-down power supply controller in-
tended for application in notebook personal computers and
other battery-powered equipment.
Fixed-frequency synchronous drive of logic-level N-channel
power MOSFETs is combined with an optional
pulse-skipping mode to achieve ultra efficient power conver-
sion over a 1000:1 load current range. The pulse-skipping
mode can be disabled in favor of fixed-frequency operation
regardless of the load current level.
High DC gain and current-mode feedback control assure ex-
cellent line and load regulation and a wide loop bandwidth
for fast response to dynamic loads.
An internal oscillator fixes the switching frequency at
300 kHz. Optionally, switching can be synchronized to an ex-
ternal clock running as fast as 400 kHz.
An optional soft-start feature limits current surges from the
input power supply at start up and provides a simple means
of start-up sequencing.
Logic-level inputs allow the controllers to be turned ON and
OFF separately.
Key Specifications
n
n
n
n
n
96% efficient
5.5 to 30V input range
Dual outputs adjustable from 2.2 to 8V
0.5% typical load regulation error
0.002%/V typical line regulation error
Features
n
300 kHz fixed-frequency switching
n
Switching synchronization with an external signal up to
400 kHz
n
Optional pulse-skipping mode
n
Adjustable secondary feedback
n
Input undervoltage lockout
n
Output undervoltage shutdown protection
n
Output overvoltage shutdown protection
n
Programmable soft-start (each controller)
n
5V, 50 mA linear regulator output
n
Precision 2.5V reference output
n
28-pin TSSOP
Applications
n
Notebook and subnotebook computers
n
Wireless data terminals
n
Battery-powered instruments
Connection Diagram and Ordering Information
28-Lead TSSOP (MTC)
DS100949-1
Top View
Order Number LM2641MTC-ADJ
See NS Package Number MTC28
漏 2000 National Semiconductor Corporation
DS100949
www.national.com

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