LM2637 2004 2637 Dongbing Zhang 19971107 2407
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LM2637
2004
2637
Dongbing Zhang
19971107
24070
ds100848
Converted nat2000 product group made more edits. file from Dongbing compose. Received LM2635 file template LM2637. template Natlgen 11/14/97 Author decided through Coris create datasheet Sgml.
LM2637
LM2637
LM2637 MPentiumK6-2 LM2637 (Power Good) rDS_ON N-FET 1.5V 2.5V
3.5V 1.3V 50kHz 1MHz MOSFET N-FET 1.5V 2.5V(
DC/DC DC/DC
24-Lead SOIC
Cyrix Pentium
View Package Number M24B 19981022
National Semiconductor Corporation
DS100848-03-JP
LM2637
(Note
(Note
1.6W
(Note
4.75V 5.25V
5VVDD Typ( )Max( )Min(
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LM2637
5VVDD Typ( )Max( )Min(
Note Note
TJMAX PMAX (TJMAX TA)/ LM2637 TJMAX 1.6W Table PWGD 1.5V 2.5V (AND)
Note Note
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LM2637
TABLE 5-Bit Output Voltage Table (VCC Test Mode)
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LM2637
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LM2637
FIGURE Controller Test Circuit
FIGURE Motherboard Power Supply Pentium Processor Core (1.3V 2.8V, 14.2A), (1.5V, 4A), Legacy (2.5V, 0.3A). External sense resistor used provide both over-current limit dynamic voltage positioning.
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LM2637
FIGURE Motherboard Power Supply Pentium Processor Core (1.8V 2.8V, 14.2A), (1.5V, 4A), Legacy (2.5V, 0.3A). High side used provide current limit.
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LM2637
PGND SNS2 SGND SNS1 FREQ PWGD VID4 VID3 VID2 VID1 VID0 SNS3 N-FET 1.5V 1.5V N-MOS (PWGD) 2.5V N-MOS 2.5V (EN) N-FET
Note:
LM2637 N-FET (PWGD) (EN)
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LM2637
rDS_ON 50kHz 1MHz N-FET 1.5V 2.5V 0.63V PWGD SNS2 SNS3 0.63V PWGD LM2637 FREQ
300kHz 5kHz LM2637 LM2637 LM2637 ENVCC N-FET BOOTV 1VGS(th) LM2637 BiCMOS 20ns( 40mA 1.2V
4.2V HIGH 4,096 PWGD 1.8V 1.8V LM2637 HIGH 3.6V LM2637 HIGH HIGH LM2637
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LM2637
Pentium K6-2 LM2637 LM2637 (MIN 100% 1.2MHz (1nF 10nF) PWGD PWGD HIGH PWGD HIGH LM2637 0.63V LM2637 LM2637 CSVCC 1.2V rDS_ON Figure rDS_ON
RIMAX IMAX IMAX RIMAX ILIM RIMAX
rDS_ON RIMAX 2.2k
FIGURE Current Limit High-Side Sensing
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LM2637
rDS_ON DS_ON 1.25 rDS_ON MOSFET (rDS_ON RIMAX 250ns 250ns Figure RSENSE
VOCP 55mV RSENSE 2.75m 3mRSENSE 60mV VOCP 30ppm/ Vishay Dale RSENSE 4000ppm/ 0.63V
Figure C2R1 R2)2 Figure 7.5mFVIN 5VVm 300kHz
FIGURE Current Limit Current Sense Resistor
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LM2637
Figure (0dB Figure
(10) FIGURE Buck Converter from Control Viewpoint 1.32kHzfP 153kHz 10-6F 50kHz Figure fzfp
(11) (11) 51C1 0.022pFR1 5.6k 820pF
FIGURE Control-to-Output Bode Plots
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LM2637
300kHz (12)
(13) rDS_ON rDS_ON rDS_ON rDS_ON FIGURE Loop Bode Plots N-FET 4000 100m 250kHz1.2MHz (VDS (ZVS) rDS_ON N-FET rDS_ON 3.3V 1.5V 3.3V 2.5V rDS_ON N-FET 3.3V 1.5V4A 3.3V 1.5V 102% 1.605V rDS_ON 1.605 401m N-FET (3.3V 105% 1.5V 98%) TO-220 DS_ON 20A/ 30A/ (MLC)
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LM2637
OSCON /OSCON MV-GX 6MV1500GX 6.3V 1500 Using Dynamic Voltage Positioning Technique Reduce Cost Output Capacitors Advanced Micorprocessor Power Supplies rDS_ON
(16)
(14)
Vo_rip rDS_ON 300kHz 18mV 2.8V
(15) 333MHz Pentium (105 1.45A) 16MV320GX (7A)2 44m/32 0.24W LM2637 3.3V 1.5V2A LM2637 105mV 105mV 2A52m 6MV1200DX
(17) DMAX LM2637 0.97A/ 14A/(0.97A/ 14.5 DMAX DMIN 300kHz LM2637 1.4A/s 14A/ (1.4A/s) Micrometals Micrometals www.micrometals.com LM2637
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LM2637
Coilcraft www.coilcraft.com 16MV820GX 210mV LM2637 (Figure
(18) (di/dt)max Pentium 0.1A/ Using Dynamic Voltage Positioning Technique Reduce Cost Output Capacitors Advanced Microprocessor Power Supplies
FIGURE Dynamic Voltage Positioning Utilizing Output Inductor Resistance VCORE
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LM2637
LM2637 10mil LM2637 (PCB LM2637
FIGURE Dynamic Voltage Positioning Using Stand-Alone Resistor Figure VCORE 1000 Figure VCORE Figure 0.78W
FIGURE Load Transient Response with DVP: 14A, Droop Resistor
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LM2637
inches (millimeters)
24-Lead Small Outline Package Order Number LM2637M Package Number M24B
135-0042 2-17-16 TEL.(03)5639-7300
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0120-666-116
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