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MIC2950-05BZ Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MIC2950-05BZ Datasheet(HTML) 11 Page - Micrel Semiconductor |
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11 / 14 page  MIC2950/2951 Micrel 3 February 1999 3-59 MIC2951 IN OUT GND FB ERROR 5 3 4 1 8 SD V V ERROR OUTPUT SHUTDOWN INPUT IN +V 100k Ω OUT V 1.2 30V 1 R 100 pF 3.3µF 2 R 1.23V REF V 7 OUT V REF = V x (1 + ) 1 R 2 R OFF ON Noise can be reduced fourfold by a bypass capacitor across R 1, since it reduces the high frequency gain from 4 to unity. Pick: 870 23 or about 0.01 µF. When doing this, the output capacitor must be increased to 3.3 µF to maintain stability. These changes reduce the output noise from 430 µV to 100 µV rms for a 100 kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. MIC2951 SD V ERROR GND 4 7 8 OUT +V IN FB 1 5 3 ERROR OUTPUT SHUTDOWN INPUT 47k Ω *SLEEP INPUT 100pF 2N3906 200k Ω 1% 100k Ω C-MOS GATE +V IN 1% 100k Ω + 3.3 µF +V OUT 470 k Ω OFF ON *HIGH INPUT LOWERS V OUT TO 2.5V Typical Applications 870 25 *MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV TO 400mV, DEPENDING ON LOAD CURRENT. MIC2951 OUT FB SD ERROR 5 1 3 7 GND 4 +VIN 8 +VIN *V ≈VIN OUT V ERROR OUTPUT SHUTDOWN INPUT OFF ON Wide Input Voltage Range Current Limiter 5V Regulator with 2.5V Sleep Function Figure 1. ERROR Output Timing Figure 2. Adjustable Regulator NOTE: PINS 2 AND 6 ARE LEFT OPEN *SEE APPLICATIONS INFORMATION * SEE APPLICATIONS INFORMATION CBYPASS ≅ 1 2R1 • 200 Hz π * OUTPUT VOLTAGE INPUT VOLTAGE ERROR NOT VALID NOT VALID 5V 1.3V 4.75V * |
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