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LP2951CDM-3.3 Datasheet(PDF) 11 Page - ON Semiconductor |
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LP2951CDM-3.3 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page LP2950 http://onsemi.com 11 330 k Figure 22. Regulator with Early Warning and Auxiliary Output +Vin Memory V+ 1.0 µF 20 5 3 Error SD Gnd FB 47 6 VO T SNS 2 Vout Vin 8 1 LP2951CN #1 1.0 µF 5 3 Error SD Gnd FB 47 6 VO T SNS 2 Vout Vin 8 1 LP2951CN #2 NC Reset VDD µP Early Warning All diodes are 1N4148. Early Warning flag on low input voltage. Main output latches off at lower input voltages. Battery backup on auxiliary output. Operation: Regulator #1’s Vout is programmed one diode drop above 5.0 V. Its error flag becomes active when Vin < 5.7 V. When Vin drops below 5.3 V, the error flag of regulator #2 becomes active and via Q1 latches the main output “off”. When Vin again exceeds 5.7 V, regulator #1 is back in regulation and the early warning signal rises, unlatching regulator #2 via D3. D4 2.7 M Q1 2N3906 D2 D1 D3 27 k 3.6 V NiCad Main Output Figure 23. 2.0 A Low Dropout Regulator +Vin Vout @ 2.0 A 100 µF NC NC R2 R1 470 5 3 Error SD Gnd FB 47 6 VO T SNS 2 Vout Vin 8 1 LP2951CN MJE2955 4.7 M Error Flag Vout = 1.25V (1.0 + R1/R2) For 5.0 V output, use internal resistors. Wire Pin 6 to 7, and wire Pin 2 to +Vout Bus. 20 k 47 4.7 µF Tant 0.05 680 0.033 µF 2N3906 10 k Current Limit Section 220 1000 µF .33 µF .01 µF 2N3906 |
Similar Part No. - LP2951CDM-3.3 |
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Similar Description - LP2951CDM-3.3 |
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