SS432G Adjustable Precision Shunt Regulator FEATURES DESCRIPTION Low voltage operation (1.24V) The SS432G is a low-voltage three-terminal adjustable shunt Adjustable output voltage from VO = V REF to 12V regulator with guaranteed thermal stability over the applicable Wide operating current range from 55µ A to 100mA temperature range. The output voltage can be set to any value Low dynamic output impedance 0.25Ω typ. between VREF (approximately 1.24V) and 12V using two external ESD rating is 6kV (per MIL-STD 883D) resistors (see application circuit). This device has a typical output Pb-free, RoHS compliant. impedance of 0.25 ohms. Active output circuitry provides very sharp turn-on characteristics, making this device an excellent alternative APPLICATIONS to Zener diodes in many applications. Linear Regulators The SS432G is characterized for operation from 0°C to 105°C, Adjustable Supplies and four package options (SOT-23-3, SOT-23-5, SOT-89, TO-92) Switching Power Supplies Battery Operated Computers allow the designer the opportunity to select the proper package Instrumentation for the application. PIN CONFIGURATION SOT-23-3 2 Anode (Top view) Cathode 3 1 BLOCK DIAGRAM Reference SOT-23-5 N/C 1 N/C 2 Cathode 3 5 Anode 4 Reference Cathode Ref + - SOT-89 (Top view) Vref 3 Cathode 2 Anode 1 Reference Anode Cathode SYMBOL TO-92 (Top view) Reference. 3 Cathode 2 Anode 1 Reference Anode ORDERING INFORMATION SS432GxB TR Package type: Example: SS432GNB TR GN = SOT-23-3, RoHS compliant GT = TO-92, RoHS compliant GG = SOT-89, RoHS compliant GV = SOT-23-5, RoHS compliant -> SS432G in RoHS-compliant SOT-23-3 shipped on tape and reel 6/22/2006 Rev.3.01 www.SiliconStandard.com 1 of 7 SS432/G ABSOLUTE MAXIMUM RATINGS over ambient temp. range. Parameter Symbol Maximum Units Cathode Voltage VKA 12 V Continuous Cathode Current I KA 150 mA Reference Current I REF 3 mA Operating Junction Temperature Tj 150 °C Storage Temperature Range T STG -45 to +150 °C Thermal Resistance θJA 160 °C/W Lead Temperature (Soldering - std.lead finish) TLEAD 260°C/10 sec. ELECTRICAL CHARACTERISTICS (TA =25°C) PARAMETER Reference voltage SYMBOL 1% Deviation of reference voltage over full temperature range Ratio of change in reference voltage to the change in cathode voltage Reference current TEST CIRCUIT TEST CONDITIONS MAX 1.240 1.252 V 4 12 mV 1 VKA = Vref IKA = 10mA VI(dev) 1 VKA = Vref, IKA = 10mA TA = full range ∆ VKA 2 IKA = 10mA, ∆ VKA = Vref to 12V -1.5 -2.7 mV/V Iref 2 IKA = 10mA, R1 = 10kΩ , R2 = ∞ 0.15 0.5 µA IKA = 10mA, R1 = 10kW, R2 = ∞ TA = full range 0.05 0.30 µA 55 80 µA 0.001 0.1 µA 0.25 0.4 Ω ∆Vref II(dev) 2 Minimum cathode current for regulation Imin 1 VKA = Vref Off-state cathode current Ioff 3 VKA = 12V, Vref = 0 |ZKA| 1 6/22/2006 Rev.3.01 1.228 TYP Vref Deviation of reference current over full temperature range Dynamic impedance MIN IKA =‹ 100µA to 100mA, VKA = Vref f ≤ 1kHz www.SiliconStandard.com 2 of 7 SS432G TYPICAL PEFORMANCE CHARACTERISTICS CATHODE CURRENT CATHODE CURRENT Vs. Vs. CATHODE VOLTAGE CATHODE VOLTAGE V KA= Vref TA = 25°C Cathode Current (µA) Cathode Current (mA) VKA = Vref T A = 25°C Cathode Voltage (V) Cathode Voltage (V) REFERENCE VOLTAGE REFERENCE INPUT CURRENT Vs. Vs. JUNCTION TEMPERATURE JUNCTION TEMPERATURE µ !"#!$%& & 6/22/2006 Rev.3.01 www.SiliconStandard.com !"#!$%& & 3 of 7 SS432G TEST CIRCUITS APPLICATION INFORMATION 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. VMAX VDEV = VMAX-VMIN VMIN 12.0mV 106 1240mV αVREF = = − 92ppm/°C 105°C T1 TEMPERATURE T2 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: ppm ∆VREF = °C 6/22/2006 Rev.3.01 6 VMAX - VMIN 6 VDEV ± ± 10 10 REF REF V (at 25°C) V (at 25°C) = T2 − T1 T2 − T1 Note 4. The dynamic output impedance, Rz, is defined as: RZ = ∆VZ ∆IZ 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: www.SiliconStandard.com rz = [ ] ∆V ≅ Rz 1+ R1 R2 ∆I 4 of 7 SS432G APPLICATION EXAMPLES VIN R1 RCL IOUT VIN SS432 RS SS432 R1 IOUT=VREF/ RCL IOUT=VREF /RS Current Limiter or Current Source VIN RIN Constant-Current Sink VIN VOUT R3 FUSE R3 VOUT R1 R1 SS432 R2 SS432 R2 VOUT ≅ (1+R1/R2) x VREF VLIMIT ≅ (1+R1/R2) x VREF Higher Current Shunt Regulator Crow Bar VIN R1A R3 R1B C1 SS432 Output turns ON when Low Limit <VIN < High Limit + SS432 R2A R2B R4 R5 VBE Low Limit≅ VREF ( 1+ R1B/ R2B )+ VBE High Limit ≅ VREF ( 1+ R1A/ R2A ) Over-Voltage/Under-Voltage Protection Circuit 6/22/2006 Rev.3.01 www.SiliconStandard.com 5 of 7 SS432G PHYSICAL DIMENSIONS SOT-23-3 D D1 E1 E SYMBOL MIN NOM MAX A 0.88 1.10 A1 0.00 ---- 0.10 D1 0.30 0.40 0.51 1.30 e 1.70 2.00 2.30 D 2.80 2.90 3.04 E 2.10 2.50 2.90 E1 1.20 1.40 1.60 e A A2 A3 Units : mm Dimensions do not include mold protrusions. A1 SOT-23-5 6/22/2006 Rev.3.01 www.SiliconStandard.com 6 of 7 SS432G PHYSICAL DIMENSIONS SOT-89 Units: mm. PHYSICAL DIMENSIONS TO-92 SEATING PLANE Symbol Min Nom Max 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. www.SiliconStandard.com 7 of 7