Voltage Regulators AN1433SSM High accuracy, variable output, low voltage operation shunt regulator Overview Unit: mm The AN1433SSM is a low voltage operation and 1.600.10 highly accurate positive voltage variable output type shunt 0.20 1.200.10 0.20 regulator IC. Since the output voltage is adjustable from 5 approximately 1.25 V to 15 V, it is suitable for a power 1 supply of small-sized 3 V-system portable equipment. Also, 2 it contributes to the miniaturization of set equipment by 3 the adoption of the small type surface mounting package. 4 Features Highly accurate reference voltage: 1.25 V (allowance: 1%) Low voltage operation: 1.25 V to 14 V Small type surface mounting package SSMINI-5D Applications Cellular phone, PHS, office automation equipment and Note) The package of this product will be changed other small-sized portable equipment to lead-free type (SSMINI-5DA). See the new package dimensions section later of this datasheet. Marking AQ Indicates No.1 pin Part No. (2 letters) Block Diagram V CC 0.01 F K Output 13 V K R1 Constant current source I REF 5 Output Ref. Error amplifier transistor Reference voltage R2 V REF 2 4 A R1 V = V (1 + ) + I R1 K REF REF R2 Publication date: December 2001 SFF00002CEB 1 Maintenance/ Discontinued Maintenance/Discontinued includes following four Product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type Please visit following URL about latest information. AN1433SSM Pin Descriptions Pin No. Description 1V Power source current supply pin. CC 2 Anode The reference voltage pin for the constant voltage of this shunt regulator IC. The current from V , cathode and reference flow out from this pin. CC 3 K: Cathode The constant voltage output pin of this shunt regulator. The supplied current more than necessary to this pin is bypassed to anode pin by the output transistor. 4 N.C. Nothing is connected to this pin. If high voltage is applied, the characteristics of the IC may be affected. 5 Reference The reference voltage (1.25 V typical) pin. Although the impedance is high under the no- rmal using conditions, be careful that the impedance drops and current flo ws into the IC inside if a current or voltage is forced to apply from the outside. Absolute Maximum Ratings Parameter Symbol Rating Unit Cathode voltage V 14.2 V K Reference voltage V 7V REF Supply current I 1.5 mA K Reference current I 50 A REF Cathode-anode reverse current I 10 mA KA Cathode-reference reverse current I 10 mA KR Cathode current I 20 mA K 2 * Power dissipation P 50 mW D 1 * Operating ambient temperature T 30 to +85 C opr 1 * Storage temperature T 55 to +150 C stg Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned. For circuit currents, + denotes current flowing into the IC and denotes current flowing out of the IC. 1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for T = 25C. 2. * a 2: The value at T = 85C. * a Recommended Operating Range Parameter Symbol Range Unit Supply voltage V V to 14 V CC REF SFF00002CEB 2 Maintenance/ Discontinued Maintenance/Discontinued includes following four Product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type Please visit following URL about latest information.