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LM2637 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2637
Description  Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2637 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM2637
Motherboard Power Supply Solution with a 5-Bit
Programmable Switching Controller and Two Linear
Regulator Controllers
General Description
The LM2637 provides a comprehensive embedded power
supply solution for motherboards hosting high performance
MPUs such as M II, PentiumII, K6-2 and other similar
high performance MPUs. The LM2637 incorporates a 5-bit
programmable, synchronous buck switching controller and
two high-speed linear regulator controllers in a 24-pin SO
package.
Switching Section — The switching regulator controller fea-
tures
a
5-bit
programmable
DAC,
over-current
and
over-voltage protection, under-voltage latch-off, a power
good signal, and output enable. The 5-bit DAC has a typical
tolerance of 1%. There are two user-selectable over-current
protection methods. One provides accurate over-current pro-
tection with the use of an external sense resistor. The other
saves cost by taking advantage of the r
DS_ON
of the
high-side FET. The over voltage protection provides two lev-
els of protection. The first level keeps the high-side FET off
and the low-side FET on. The second provides a gate signal
that can be used to fire an external SCR.
Linear Section — The two linear regulator controllers fea-
ture wide control bandwidth, N-FET and NPN transistor driv-
ing capability, and an adjustable output voltage. The wide
control bandwidth makes meeting fast load transient re-
sponse requirement such as that of the GTL+ bus an easy
job. In minimum configuration, the two controllers default to
1.5V and 2.5V respectively.
Both linear controllers have under voltage latch-off.
Features
n Provides 3 regulated voltages
n Power Good flag and output enable
n Under-voltage latch-off
Switching Section
n Synchronous rectification
n 5-bit DAC programmable from 3.5V to 1.3V
n Typical 1% DAC tolerance
n Switching frequency: 50 kHz to 1 MHz
n Two levels of over-voltage protection
n Two methods of over-current protection
n Adaptive non-overlapping FET gate drives
n Soft start without external capacitor
Linear Section
n N-FET and NPN driving capability
n Ultra fast response speed
n Output voltages default to 1.5V and 2.5V yet adjustable
Applications
n Embedded power supplies for PC motherboards
n Triple DC/DC power supplies
n Programmable high current DC/DC power supply
Pin Configuration
MIIis a trademark of Cyrix Corporation a wholly owned subsidiary of National Semiconductor Corporation.
Pentiumis a trademark of Intel Corporation.
K6 is trademark of Advanced Micro Devices, Inc.
24-Lead SOIC
DS100848-1
Top View
NS Package Number M24B
October 1998
© 1999 National Semiconductor Corporation
DS100848
www.national.com


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