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| MITSUMI High-Precision Three-Pin Regulator MM1257 High-Precision Three-Pin Regulator Monolithic IC MM1257 Outline This IC is a high-precision high-voltage stabilized power supply device which stands out from ordinary lowsaturation three-pin regulators. It can be used at a wide range of output voltages, from 3V to 12V, delivering output currents up to 100mA. It is one of a series of devices available at lower prices than previous regulators. Features 1. 2. 3. 4. 5. 6. Input current Output noise voltage Maximum output current No-load input current Thermal shutdown circuit provided Output voltage ranks 27V max. 200Vrms typ. 100mA max. 500A typ. A : 12V2% E : 6V2% B : 10V2% F : 5V2% C : 9V2% G : 3V2% D : 8V2% Package TO-92A (MM1257 T) MMP-4A (MM1257 M) The output voltage rank appears in the boxes. * Applications 1. Handheld computers 2. Portable transceivers 3. Cordless phones Pin Assignment 4 3 1 2 3 NC VIN VOUT GND 1 2 3 1 2 3 VOUT GND VIN 1 2 4 MMP-4A (TOP VIEW) TO-92A MITSUMI High-Precision Three-Pin Regulator MM1257 Equivalent Circuit Diagram Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply current Output current Maximum Ratings (Ta=25C) Symbol TSTG TOPR VCC max. IOUT Pd Ratings -40~+125 -20~+75 27 100 200 (MMP-4A), 300 (TO-92A) Units C C V mA mW Recommended Operating Conditions Item Input voltage Output current Symbol VIN IO Ratings 7~27 1~100 Units V mA Pin Description Pin no. 1 2 3 4 Pin name N.C VIN VOUT GND N.C Power supply input pin Regulator output pin GND Function MITSUMI High-Precision Three-Pin Regulator MM1257 Electrical Characteristics Item (VO=5V) Measurement circuit Measurement conditions A B C D E F G A B C D E F G A B C D E F G Min. Typ. Max. Units 11.76 12.0 12.24 9.80 10.0 10.20 8.82 9.0 9.18 7.84 8.0 8.16 V 5.88 6.0 6.12 4.90 5.0 5.10 2.94 3.0 3.06 0.50 1.50 mA 120 250 110 250 100 250 90 250 mV 60 200 50 150 25 150 80 160 70 140 65 130 60 120 mV 40 80 20 60 20 60 Symbol Output voltage VO 1 VIN=Vo+3V, Io=40mA No-load input current ICCq 1 Input fluctuation rate V1 1 Load fluctuation rate V2 1 VIN=7V, Io=40mA VIN=Vo+4V, Io=40mA VIN=14.5V~25V, Io=40mA VIN=12.5V~24V, Io=40mA VIN=11.5V~22V, Io=40mA VIN=10.5V~22V, Io=40mA VIN=8.5V~20V, Io=40mA VIN=7V~20V, Io=40mA VIN=7V~18V, Io=40mA VIN=15V, Io=1~100mA VIN=13V, Io=1~100mA VIN=12V, Io=1~100mA VIN=11V, Io=1~100mA VIN=9V, Io=1~100mA VIN=8V, Io=1~100mA VIN=8V, Io=1~100mA Measuring Circuit Application Circuits |
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