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LP2950 Datasheet(PDF) 10 Page - Advanced Monolithic Systems |
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LP2950 Datasheet(HTML) 10 Page - Advanced Monolithic Systems |
10 / 14 page Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 LP2950/LP2951 APPLICATION HINTS (Continued) OUTPUT VOLTAGE ERROR* INPUT VOLTAGE 4.75V 5V 1.3V R 1 ERROR* ERROR OUPUT **SHUTDOWN INPUT GND FB V OUT V REF R 2 SD 1.23V 7 4 3 8 1 5 +V IN +V IN V OUT 1.2 30V 3.3 µF .01 µF + * 100k LP2951 FIGURE 1. ERROR Output Timing FIGURE 2. Adjustable Regulator *When VIN 1.3V the error flag pin becomes a high impedance, and the error flag voltage rises to its pull-up voltage. Using Vout as the pull-up voltage (see Figure 2), rather than an external 5V source, will keep the error flag voltage under 1.2V (typ.) in this condition. The user may wish to drive down the error flag voltage using equal value resistors (10 k suggested), to ensure a low-level logic signal during any fault condition, while still allowing a valid high logic level during normal operation. *See Application Hints. Vout = VREF × (1 + R 1/ R2) **Drive with TTL- high to shut down. Ground or leave if shutdown feature is not used. Note: Pins 2 and 6 are left open. TYPICAL APPLICATIONS 300 mA Regulator with 0.75 Dropout Wide Input Voltage Range Current Limiter UNREGULATED INPUT LOAD 50mA TO 300mA GND FB OUT IN 4 7 6 2 1 8 V TAP LP2951 2N5432 (2) SENSE 5V OUTPUT 4.7µF 27kΩ 330Ω ERROR ERROR OUPUT SHUTDOWN INPUT GND FB V OUT SD 7 4 3 8 1 5 +V IN +V IN LP2951 *V OUT ≈ V ΙΝ *Minimum Input-Output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160 mA |
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