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| SS432G Adjustable Precision Shunt Regulator FEATURES Low voltage operation (1.24V) Adjustable output voltage from VO = V REF to 12V Wide operating current range from 55 A to 100mA Low dynamic output impedance 0.25 typ. ESD rating is 6kV (per MIL-STD 883D) DESCRIPTION The SS432G is a low-voltage three-terminal adjustable shunt regulator with a guaranteed thermal stability over the applicable temperature range. The output voltage can be set to any value between VREF (approximately 1.24V) to 12V with two external resistors (see application circuit). This device has a typical output impedance of 0.25 ohms. Active output circuitry provides very sharp turn-on characteristics, making this device an excellent replacement for Zener diodes in many applications. The SS432G is characterized for operation from 0C to 105C, and three package options (SOT-23, SOT-89, and TO-92) allow the designer the opportunity to select the proper package for his application. Pb-free, RoHS compliant. APPLICATIONS Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives PIN CONFIGURATION SOT-23 (Top view) BLOCK DIAGRAM Cathode Ref 2 Cathode Anode 3 1 + Reference Vref SOT-89 (Top view) Anode 3 2 1 Cathode Anode Reference TO-92 (Top view) 3 Cathode 2 Anode 1 Reference SYMBOL Cathode Ref. Anode Rev.2.20 7/12/2005 www.SiliconStandard.com 1 of 7 SS432/G ABSOLUTE MAXIMUM RATINGS over ambient temp. range. Parameter Cathode Voltage Continuous Cathode Current Reference Current Operating Junction Temperature Storage Temperature Range Thermal Resistance Lead Temperature (Soldering - std.lead finish) Symbol VKA I KA I REF Tj T STG Maximum 12 Units V 150 3 150 -45 to +150 160 260C/10 sec. mA mA C C C/W JA TLEAD ELECTRICAL CHARACTERISTICS (TA =25C) PARAMETER SYMBOL TEST CIRCUIT TEST CONDITIONS MIN TYP MAX Reference voltage 1% Vref 1 VKA = Vref IKA = 10mA VKA = Vref, IKA = 10mA TA = full range IKA = 10mA, VKA = Vref to 12V IKA = 10mA, R1 = 10k , R2 = IKA = 10mA, R1 = 10kW, R2 = TA = full range VKA = Vref 1.228 1.240 1.252 V Deviation of reference voltage over full temperature range Ratio of change in reference voltage to the change in cathode voltage Reference current Deviation of reference current over full temperature range Minimum cathode current for regulation Off-state cathode current Dynamic impedance VI(dev) 1 4 -1.5 0.15 0.05 12 -2.7 0.5 0.30 80 0.1 0.4 mV mV/V A A Vref VKA Iref II(dev) Imin 2 2 2 1 55 0.001 0.25 A A Ioff |ZKA| 3 1 VKA = 12V, Vref = 0 IKA = 100A to 100mA, VKA = Vref f 1kHz Rev.2.20 7/12/2005 www.SiliconStandard.com 2 of 7 SS432G TYPICAL PEFORMANCE CHARACTERISTICS CATHODE CURRENT Vs. CATHODE VOLTAGE CATHODE CURRENT Vs. CATHODE VOLTAGE V KA= Vref TA = 25C VKA = Vref TA = 25C Cathode Current (mA) Cathode Current (A) Cathode Voltage (V) Cathode Voltage (V) REFERENCE VOLTAGE Vs. JUNCTION TEMPERATURE REFERENCE INPUT CURRENT Vs. JUNCTION TEMPERATURE !"#!$%& & !"#!$%& & Rev.2.20 7/12/2005 www.SiliconStandard.com 3 of 7 SS432G TEST CIRCUITS APPLICATION INFORMATION VMAX VDEV = VMAX-VMIN VMIN Where: T2-T1=full temperature change. VREF can be positive or negative depending on whether the slope is positive or negative. Example: VDEV= 12.0mV, VREF= 1240mV, T2-T1= 105C, slope is negative. VREF = T1 TEMPERATURE T2 12.0mV 106 1240mV 105C = - 92ppm/C Deviation of reference input voltage, V DEV, is defined as the maximum variation of the reference input voltage over the full temperature range. The average temperature coefficient of the reference input voltage, VREF is defined as: Note 4. The dynamic output impedance, Rz, is defined as: RZ = VZ IZ ppm VREF = C 6 VMAX - VMIN 6 VDEV 10 10 VREF(at 25C) VREF(at 25C) = T2 - T1 T2 - T1 When the device is programmed with two external resistors, R1 and R2, (see Fig. 2), the dynamic output impedance of the overall circuit, is defined as: rz = V Rz 1+ R1 R2 I [] Rev.2.20 7/12/2005 www.SiliconStandard.com 4 of 7 SS432G APPLICATION EXAMPLES VIN R1 RCL IOUT VIN SS432 SS432 R1 RS IOUT=VREF/ RCL Current Limiter or Current Source IOUT=VREF /RS Constant-Current Sink VIN RIN R3 R1 VOUT VIN FUSE R1 R3 VOUT SS432 R2 SS432 R2 VOUT (1+R1/R2) x VREF Higher-Current Shunt Regulator VLIMIT (1+R1/R2) x VREF Crow Bar VIN R1A R1B R3 SS432 Output turns ON when Low Limit + R4 R5 VBE Low Limit VREF ( 1+ R1B/ R2B )+ VBE High Limit VREF ( 1+ R1A/ R2A ) Over-Voltage/Under-Voltage Protection Circuit Rev.2.20 7/12/2005 www.SiliconStandard.com 5 of 7 SS432G PHYSICAL DIMENSIONS D SYMBOL D1 SOT-23 MIN NOM MAX A A1 D1 0.88 0.00 0.30 1.70 2.80 2.10 1.20 1.10 ---0.40 2.00 2.90 2.50 1.40 1.30 0.10 0.51 2.30 3.04 2.90 1.60 e E1 E D E E1 e A A2 A3 A1 Units : mm Dimensions do not include mold protrusions. SOT-89 Units: mm. Rev.2.20 7/12/2005 www.SiliconStandard.com 6 of 7 SS432G PHYSICAL DIMENSIONS TO-92 Symbol Min Nom Max SEATING PLANE Units: mm. ORDERING INFORMATION SS432GxB xx TR: Tape and Reel Packing Bandgap tolerance B = 1% Package type GN = SOT-23-3, RoHS compliant GT = TO-92, RoHS compliant GG = SOT-89, RoHS compliant Example: SS432GNB TR SS432 with 1% tolerance in SOT-23-3 with pb-free lead finish shipped on tape and reel Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of Silicon Standard Corporation or any third parties. Rev.2.20 7/12/2005 www.SiliconStandard.com 7 of 7 |
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