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MIC29202WU Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC29202WU Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 12 page MIC2920A/29201/29202/29204 Micrel, Inc. February 2005 9 M9999-021505 SHUT- DOWN V GND 4 7 8 OUT +VIN ADJUST 1 3 SHUTDOWN INPUT 100pF 2N2222 1% 300kΩ ≥ 5.3V 1% 180kΩ + 10µF 470 kΩ HIGH = OFF LOW = ON LOW = 3.3V OUT 220kΩ 1% V CC OUT HIGH = 5V OUT Automotive Applications The MIC2920A is ideally suited for automotive applications for a variety of reasons. It will operate over a wide range of input voltages with very low dropout voltages (40mV at light loads), and very low quiescent currents (100µAtypical).These features are necessary for use in battery powered systems, such as automobiles. It is a “bulletproof” device with the abil- ity to survive both reverse battery (negative transients up to 20V below ground), and load dump (positive transients up to 60V) conditions.Awide operating temperature range with low temperature coefficients is yet another reason to use these versatile regulators in automotive designs. tor from 1µF to 220µF only decreases the noise from 430µV to 160µV RMS for a 100kHz bandwidth at 5V output. Noise can be reduced fourfold by a bypass capacitor across R 1, since it reduces the high frequency gain from 4 to unity. Pick or about 0.01µF. When doing this, the output capacitor must be increased to 10µF to maintain stability. These changes re- duce the output noise from 430µV to 100µV rms for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improve- ments are more dramatic at higher output voltages. NOTE: PINS 2 AND 6 ARE LEFT OPEN IN OUT GND ADJUST E R R O R 5 3 4 1 8 SHUTDOWN V V E R R O R OUTPUT SHUTDOWN INPUT IN +V 100kΩ OUT V 1.2 26V 1 R 100 pF 10µF 2 R 1.23V R E F V 7 V OUT = VR E F x (1 + ) 1 R 2 R O FF ON IN OUT GND V +V IN V OUT V = 5V 10µF + Figure 2. MIC2920A-5.0 Fixed +5V Regulator Figure 3. MIC29202/29204 Adjustable Regulator. Pinout is for MIC29204. Typical Applications Figure 5. MIC29202/29204 5.0V or 3.3V Selectable Regulator with Shutdown. Pinout is for MIC29204. Figure 4. MIC29204 Wide Input Voltage Range Current Limiter PIN 3 LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V. CBYPASS 1 2 πR1 • 200 Hz = IN OUT GND ADJUST E R R O R 5 3 4 1 8 SD V +V E R R O R OUTPUT SHUTDOWN INPUT IN +V OUT *V 7 O F F ON IN = V * Minimum Input-Output Voltage ranges from 40mV to 400mV, depending on load current |
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