LM2638 1999 2638 Dongbing Zhang 19981201 24075 ds101034 Conv

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LM2638 1999 2638 Dongbing Zhang 19981201 24075 ds101034 Conv

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LM2638
1999 2638 Dongbing Zhang 19981201 24075 ds101034
Converted nat2000 changes were still missing. Checking they were done from Carol. sent compose. added changes Dongbing. Graphic changes sent RRD. composed with changes elec. table note block. document authored RRD.
LM2638
LM2638
LM2638 PentiumIIM IITMK6TM-2 LM2638 (Power Good) rDS_ON N-FET 1.5V 1.25V
1.3V 50kHz 1MHz MOSFET
N-FET 1.5V 1.25V(
DC/DC DC/DC
24-Lead SOIC
View Order Number LM2638M Package Number M24B 19990507
Cyrix Pentium
National Semiconductor Corporation
Printed Japan 1/00
LM2638
(Note
(Note
1.6W
(Note
4.75V 5.25V
5VVDD Typ( )Max( Min( Symbol IQ_VCC IQ_VDD RDS_CP Parameter Internal Pull-up Current Operating Current Shutdown Current Shutdown Current Resistance Conditions 10111 Pins Floating Pins Floating High Side Side (Note 1000 1.25 3.25 4096 12.5 SNS1 Rises from Rated Output Voltage SNS1 Falls from Rated Output Voltage Units
SWITCHING SECTION VDACOUT 5-Bit Output Voltage IVID Pins Internal Pull-up Current fOSC Oscillator Frequency DMAX DMIN RSNS1 RDS_SRC RDS_SINK VCC_TH1 VCC_TH2 VDAC_IH VDAC_IL BWEA VRAMP_L VRAMP_H DSTEP_SS tPWGD tPWBAD Maximum Duty Cycle Minimum Duty Cycle SNS1 Resistance Ground Gate Driver Resistance When Sourcing Current Gate Driver Resistance When Sinking Current Power-On-Reset Threshold Shutdown Threshold Input High Voltage Input Voltage Error Amplifier Gain Error Amplifier Unity Gain Bandwidth Ramp Signal Valley Voltage Ramp Signal Peak Voltage Soft Start Time Duty Cycle Step Change during Soft Start PWGD Response Time PWGD Response Time
Clock Cycles
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LM2638
5VVDD Typ( )Max( Min( Symbol Parameter SWITCHING SECTION VPWGD_HI PWGD High Trip Point Conditions Above Rated Output Voltage When Output Voltage Above Rated Output Voltage When Output Voltage (Note Below Rated Output Voltage When Output Voltage Below Rated Output Voltage When Output Voltage (Note SNS1 Above Rated Output 4.8V Drops from Units
11.5
VPWGD_LO
PWGD Trip Point
Over-Voltage Trip Point Sink Current Over-Current Trip Point Differential Voltage) 1.5V CONTROLLER SECTION VSNS2 SNS2 Voltage VOVP_TRP VOCP ROUT2 ISNS2 VPWGD_HI VPWGD_LO Output Resistance SNS2 Bias Current PWGD High Trip Point PWGD Trip Point 1.25V CONTROLLER SECTION SNS3 Voltage VSNS3 Output Resistance SNS3 Bias Current PWGD High Trip Point PWGD Trip Point
12V, 4.75V 5.25V, When Regulating (Note (Note 12V, 4.75V 5.25V, When Regulating (Note (Note
1.463
0.63 0.44
1.538
1.219
1.25 0.63 0.44
1.281
ROUT3 ISNS3 VPWGD_HI VPWGD_LO
Note Note
TJMAX PMAX (TJMAX TA)/ LM2638 TJMAX 1.6W Table PWGD 1.5V 1.25V (AND)
Note Note
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LM2638
5VVDD Typ( )Max( Min(
TABLE 5-Bit Output Voltage Table
(VCC Test Mode) Symbol VDACOUT Parameter 5-Bit Output Voltages Different Codes Conditions VID4:0 01111 VID4:0 01110 VID4:0 01101 VID4:0 01100 VID4:0 01011 VID4:0 01010 VID4:0 01001 VID4:0 01000 VID4:0 00111 VID4:0 00110 VID4:0 00101 VID4:0 00100 VID4:0 00011 VID4:0 00010 VID4:0 00001 VID4:0 00000 VID4:0 11111 VID4:0 11110 VID4:0 11101 VID4:0 11100 VID4:0 11011 VID4:0 11010 VID4:0 11001 VID4:0 11000 VID4:0 10111 VID4:0 10110 VID4:0 10101 VID4:0 10100 VID4:0 10011 VID4:0 10010 VID4:0 10001 VID4:0 10000 Typical 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 (shutdown) Units
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LM2638
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
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LM2638
FIGURE Controller Test Circuit
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LM2638
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FIGURE Using LM2638 Supply (VTT, 1.5V, 5.6A), 2.5V Standby (VCC2_5SBY, Full Power Suspend) 3.3V Standby (VCC3_3SBY, 1.5A Full Power, 0.5A Suspend)
LM2638
inches (millimeters)
24-Lead Small Outline Package Order Number LM2638M Package Number M24B
135-0042 2-17-16 TEL.(03)5639-7300
http://www.national.com/JPN/
0120-666-116

LM2638 1999 2638 Dongbing Zhang 19981201 24075 ds101034 Conv

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