SS2432G

SS2432G Dual Adjustable Precision Shunt Regulator FEATURES Low voltage operation (1.25V) Adjustable output voltage from VO = V REF to 12V Wide operating current range from 55uA to 100mA Low dynamic output impedance 0.25Ω typ. ESD rating is 6kV (per MIL-STD 883D) DESCRIPTION The SS2432G consists of a pair of low-voltage adjustable shunt regulators with a guaranteed thermal stability over the applicable temperature range. The output voltage can be set to any value between VREF (approximately 1.25V) 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 SS2432G is characterized for operation from 0°C to 105°C. APPLICATIONS Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives PIN CONFIGURATION Cathode 1 1 Cathode 2 3 Pin 1 : Cathode 1 Pin 2 : Common Anode Pin 3 : Cathode 2 Pin 4 : Reference 2 Pin 5 : Common Anode Pin 6 : Reference 1 Reference 1 6 Reference 2 4 2 5 Common Anode PACKAGE The device is supplied in a SOT23-6 package. Reference 2 Anode Reference 1 Cathode 2 Anode Cathode 1 Pb-free lead finish (second-level interconnect). 1/14/2005 Rev.2.10 www.SiliconStandard.com 1 of 6 SS2432G 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 +150 160 260°C/10 sec. mA mA °C °C °C/W θJA TLEAD ELECTRICAL CHARACTERISTICS (TA =25°C) 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 = 10kΩ , 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 µA µA ∆ Vref ∆ VKA Iref II(dev) Imin 2 2 2 1 55 0.001 0.25 µA µA Ω Ioff |ZKA| 3 1 VKA = 12V, Vref = 0 IKA = 100µA to 100mA, VKA = Vref ‹ f ≤ 1kHz 1/14/2005 Rev.2.10 www.SiliconStandard.com 2 of 6 SS2432G TYPICAL PEFORMANCE CHARACTERISTICS CATHODE CURRENT Vs. CATHODE VOLTAGE    CATHODE CURRENT Vs. CATHODE VOLTAGE  V KA= Vref TA = 25°C  VKA = Vref TA = 25°C Cathode Current (mA) Cathode Current (µA)    





       


    Cathode Voltage (V) Cathode Voltage (V) REFERENCE VOLTAGE Vs. JUNCTION TEMPERATURE   


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1/14/2005 Rev.2.10 www.SiliconStandard.com 3 of 6 SS2432G TEST CIRCUITS

 
 





  
  
 

 
 




 




 



 
APPLICATION INFORMATION VMAX VDEV = VMAX-VMIN VMIN Where: T2−T1=full temperature change. αVREF can be positive or negative depending on whether the slope is positive or negative. Example: VDEV= 12.0mV, VREF= 1240mV, T2−T1= 105°C, slope is negative. αVREF = T1 TEMPERATURE T2  12.0mV 106  1240mV    105°C = − 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, αVREF 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 25°C) VREF(at 25°C)   = 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 [] 1/14/2005 Rev.2.10 www.SiliconStandard.com 4 of 6 SS2432G 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