IC Phoenix
 
Home ›  LL28 > LM2638M-LM2638MX,Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
LM2638M-LM2638MX Fast Delivery,Good Price
Part Number:
If you need More Quantity or Better Price,Welcom Any inquiry.
We available via phone +865332716050 Email
Partno Mfg Dc Qty AvailableDescript
LM2638MNSCN/a1325avaiMotherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
LM2638MXNSCN/a10000avaiMotherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers


LM2638MX ,Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator ControllersFeaturessupply solution for motherboards hosting high performancen Provides 3 regulated voltages™ ™ ..
LM2639M ,5-Bit Programmable, High Frequency Multi-phase PWM ControllerFeatures™ ™ ™MII ,K6 -2, K6 -3, etc.) exhibiting ultra fast load tran-n Ultra fast load transient r ..
LM2639MX ,5-Bit Programmable, High Frequency Multi-phase PWM ControllerLM2639 5-Bit Programmable, High Frequency Multi-phase PWM ControllerFebruary 2000LM26395-Bit Progra ..
LM26400YMH/NOPB ,Dual 2A, 500kHz Wide Input Range Buck Regulator 16-HTSSOP -40 to 125 SNVS457D–FEBRUARY 2007–REVISED OCTOBER 20155 Pin Configuration and FunctionsPWP PackageNHQ Package ..
LM26400YMHX/NOPB ,Dual 2A, 500kHz Wide Input Range Buck Regulator 16-HTSSOP -40 to 125Features 3 DescriptionThe LM26400Y device is a monolithic, two-output1• Input Voltage Range of 3 V ..
LM26400YSD , Dual 2A, 500kHz Wide Input Range Buck Regulator
LM4908MA ,LM4908 10kV ESD Rated, Dual 120mW Headphone AmplifierGeneral Description j Output power at 0.1% THD+Nat 1kHz into 32Ω 75mW (typ)The LM4908 is a dual aud ..
LM4908MM ,LM4908 10kV ESD Rated, Dual 120mW Headphone AmplifierFeaturesBoomeraudiopoweramplifiersweredesignedspecificallyton Up to 10kV ESD protection on all pins ..
LM49100GR/NOPB ,Mono Class AB Audio Sub-System with a True-Ground Headphone Amplifier 25-csBGA -40 to 85 SNAS392F –JUNE 2007–REVISED MAY 2013Connection Diagrams1 2 3 4 5AVDDCP GNDCP MIN+ BYPASS RINB C1N ..
LM4910LQ ,LM4910 Output Capacitor-less Stereo 35mW Headphone AmplifierGeneral Description Key Specificationsn PSRR at f = 217Hz 65dB (typ)The LM4910 is an audio power am ..
LM4910LQX ,LM4910 Output Capacitor-less Stereo 35mW Headphone AmplifierFeaturesoutput coupling capacitors and half-supply bypass capaci-n Eliminates headphone amplifier o ..
LM4910MA ,LM4910 Output Capacitor-less Stereo 35mW Headphone AmplifierLM4910 Output Capacitor-less Stereo 35mW Headphone AmplifierFebruary 2003LM4910Output Capacitor-les ..


LM2638M-LM2638MX
Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
LM2638
Motherboard Power Supply Solution witha 5-Bit
Programmable Switching Controller and Two Linear
Regulator Controllers
General Description

The LM2638 providesa comprehensive embedded power
supply solutionfor motherboards hosting high performance
MPUs suchas Pentium™ II,MII™,K6™-2and other similar
high performance MPUs. The LM2638 incorporatesa 5-bit
programmable, synchronous buck switching controller and
two high-speed linear regulator controllersina 24-pinSO
package.Ina typical application,the switching controller
suppliesthe MPU core,andthe linear regulator controllers
supplythe GTL+busandthe clockor graphics chip core.A
charge pumppin helps providethe necessary voltageto
powerthe linear sections when12V isshutoff during system
standby suchas STR mode.
Switching Section— The switching regulator controllerfea-
turesan Intel-compatible, 5-bit programmable output volt-
age, over-currentand over-voltage protection,a power good
signal,anda logic-controlled output enable. Therearetwo
user-selectable over-current protection methods. One pro-
vides accurate over-current protectionwiththeuseofanex-
ternal sense resistor.The other savescostby taking advan-
tageofthe rDS_ONofthe high-side FET. When thereisan
over voltage,the controller turnsoffthe high side FETand
turnsonthelow side.
Linear Section— Thetwo linear regulator controllers fea-
ture wide control bandwidth, N-FETand NPN transistor driv-
ing capability andan adjustable output. The wide control
bandwidth makes meetingthe GTL+bus transient response
requirementan easyjob.In minimum configuration,thetwo
controllers defaultto 1.5Vand 1.25V respectively.
Both linear controllers have under voltage latch-off.
Features
Provides3 regulated voltages Power Goodflagand output enable Charge pumppin
Switching Section Synchronous rectification 5-bit DAC programmable downto 1.3V Typical ±1% DAC tolerance Switching frequency:50kHzto1 MHz Over-voltage protection Two methodsof over-current protection Adaptive non-overlapping FET gate drives Soft start without external capacitor
Linear Section N-FETand NPN drive capability Ultrafast response speed Under voltage latch-offat 0.63V Output voltages defaultto 1.5Vand 2.5Vyet adjustable
Applications
Embedded power suppliesfor motherboards Triple DC/DC power supplies Programmable high current DC/DC power supply
Pin Configuration

MII™ isatrademarkofCyrixCorporationawholly owned subsidiaryof National Semiconductor Corporation.
Pentium™isatrademark ofIntelCorporation.
K6™isatrademark ofAdvancedMicro Devices,Inc.
24-Lead SOIC

DS101034-1
Top View
Order Number LM2638M
SeeNS Package Number M24B

May 1999
LM2638
Motherboard
Power
Supply
Solution
with
5-Bit
Programmable
Switching
Controller
and
Linear
Regulator
Controllers

©1999 National Semiconductor Corporation DS101034
ic,good price


TEL:86-533-2716050      FAX:86-533-2716790
   

©2020 IC PHOENIX CO.,LIMITED