Datenblatt-Suchmaschine für elektronische Bauteile |
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LM2638 Datenblatt(PDF) 3 Page - National Semiconductor (TI) |
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LM2638 Datenblatt(HTML) 3 Page - National Semiconductor (TI) |
3 / 8 page Electrical Characteristics V CC = 5V, VDD = 12V unless otherwise specified. Typicals and limits appearing in plain type apply for T A = TJ = +25˚C. Limits appearing in boldface type apply over the 0˚C to +70˚C range. (Continued) Symbol Parameter Conditions Min Typ Max Units SWITCHING SECTION V PWGD_HI PWGD High Trip Point % Above Rated Output Voltage When Output Voltage ↑ 11.5 13 % % Above Rated Output Voltage When Output Voltage ↓ (Note 4) 5 7 9 V PWGD_LO PWGD Low Trip Point % Below Rated Output Voltage When Output Voltage ↑ 2.6 6 % % Below Rated Output Voltage When Output Voltage ↓ (Note 4) 6 9.5 13 V OVP_TRP Over-Voltage Trip Point % SNS1 Above Rated Output 15 25 35 % I CS+ CS+ Pin Sink Current CS+ = 5V, CS− = 4.8V 126 185 244 µA V OCP Over-Current Trip Point (CS+ and CS− Differential Voltage) CS+ = 2V, CS− Drops from 2V 41 55 69 mV 1.5V LDO CONTROLLER SECTION V SNS2 SNS2 Voltage V DD = 12V, VCC = 4.75V to 5.25V, I G2 = 0mAto20mA 1.463 1.5 1.538 V R OUT2 Output Resistance 200 Ω I SNS2 SNS2 Pin Bias Current When Regulating 21 µA V PWGD_HI PWGD High Trip Point (Note 4) 0.63 V V PWGD_LO PWGD Low Trip Point (Note 4) 0.44 V 1.25V LDO CONTROLLER SECTION V SNS3 SNS3 Voltage V DD = 12V, VCC = 4.75V to 5.25V, I G3 = 0mAto20mA 1.219 1.25 1.281 V R OUT3 Output Resistance 200 Ω I SNS3 SNS3 Pin Bias Current When Regulating 0 µA V PWGD_HI PWGD High Trip Point (Note 4) 0.63 V V PWGD_LO PWGD Low Trip Point (Note 4) 0.44 V Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings are conditions under which the device operates correctly. Operating Ratings do not imply guaranteed performance limits. Note 2: Maximum allowable power dissipation is a function of the maximum junction temperature, TJMAX, the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PMAX = (TJMAX −TA)/θJA. The junction-to-ambient thermal resistance, θJA, for LM2638 is 78˚C/W. For a TJMAX of 150˚C and TA of 25˚C, the maximum allowable power dissipation is 1.6W. Note 3: The letter N stands for the typical output voltages appearing in italic boldface type in Table 1. Note 4: The output level of the PWGD pin is a logic AND of the power good function of the switching section, the 1.5V section and the 1.25V section. For the switch- ing section, the power good is a window. For the two linear sections, the power good is a threshold with some hysteresis. www.national.com 3 |
Ähnliche Teilenummer - LM2638 |
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Ähnliche Beschreibung - LM2638 |
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