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LM2637M-LM2637MX
Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
LM2637
Motherboard Power Supply Solution with a 5-Bit
Programmable Switching Controller and Two Linear
Regulator Controllers
General DescriptionThe LM2637 providesa comprehensive embedded power
supply solutionfor motherboards hosting high performance
MPUs suchasM II™, Pentium™II, K6-2 and other similar
high performance MPUs. The LM2637 incorporatesa 5-bit
programmable, synchronous buck switching controller and
two high-speed linear regulator controllersina 24-pin SO
package.
Switching Section— The switching regulator controller fea-
turesa 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 hasa typical
toleranceof 1%. There are two user-selectable over-current
protection methods. One provides accurate over-current pro-
tection withthe useofan external sense resistor. The other
saves costby taking advantageof the rDS_ONof the high-
side FET. The over voltage protection provides two levelsof
protection. The first level keepsthe high-side FEToff andthe
low-side FETon. The second providesa gate signal that can usedtofirean external SCR.
Linear Section— The two linear regulator controllers fea-
ture wide control bandwidth, N-FET and NPN transistor driv-
ing capability, andan adjustable output voltage. The wide
control bandwidth makes meeting fast load transient re-
sponse requirement suchas thatof the GTL+ busan easy
job.In minimum configuration, the two controllers defaultto
1.5V and 2.5V respectively.
Both linear controllers have under voltage latch-off.
Features Provides3 regulated voltages Power Good flag and output enable Under-voltage latch-off
Switching Section Synchronous rectification 5-bit DAC programmable from 3.5Vto 1.3V Typical 1% DAC tolerance Switching frequency:50 kHzto1 MHz Two levelsof over-voltage protection Two methodsof over-current protection Adaptive non-overlapping FET gate drives Soft start without external capacitor
Linear Section N-FET and NPN driving capability Ultra fast response speed Output voltages defaultto 1.5V and 2.5Vyet adjustable
Applications Embedded power suppliesfor PC motherboards Triple DC/DC power supplies Programmable high current DC/DC power supply
Pin Configuration
24-Lead SOICTop View Package Number M24B
November 2004
LM2637
Motherboard
Power
Supply
Solution
with
5-Bit
Programmable
Switching
Controller
Linear
Regulator
Controllers
