SC431L Low Voltage Adjustable Shunt Regulator POWER MANAGEMENT Description Features The SC431L is a three terminal adjustable shunt Low voltage operation (down to 1.24V) regulator with thermal stability guaranteed over Wide operating current range 100A to 100mA temperature. The output voltage can be adjusted to any Low dynamic output impedance 0.05 typ. value from 1.24V (V ) to 20V with two external REF Trimmed bandgap design 0.25% resistors. The SC431L has a typical dynamic output Upgrade for TLV431A impedance of 0.05 . Active output circuitry provides a SOT-23-3 and SOT-23-5 packages. Also available in very sharp turn on characteristic, making the SC431L an Lead-free package, fully WEEE and RoHS compliant excellent replacement for zener diodes. Applications The SC431L shunt regulator is available with four volt- age tolerances (0.25%, 0.5%, 1.0% and 2.0%), two Linear Regulators operating temperature ranges (commercial and indus- Adjustable Supplies trial) and two package options (SOT-23-3 and SOT-23- Switching Power Supplies 5). This allows the designer the opportunity to select the Battery Operated Computers optimum combination of cost and performance for their Instrumentation application. Computer Disk Drives (1)(2) Typical Application Circuit Notes: 1) Set V according to the following equation: OUT R1 V = V 1+ +I R1 OUT REF REF R2 2) Choose the value for R as follows: The maximum limit for R should be such that the cathode current, I , is greater than the minimum Z operating current (100A) at V . IN(MIN) The minimum limit for R should be such that I does Z not exceed 100mA under all load conditions, and the instantaneous turn-on value for I does not exceed Z 150mA. Both of the following conditions must be met: V IN(max) R (to limit instantaneous turn-on I ) min Z 150 mA V V IN (max) OUT R min (to limit I under normal I + 100 mA Z OUT (min) operating conditions) Revision: May 16, 2008 1 www.semtech.comSC431L POWER MANAGEMENT Absolute Maximum Ratings Parameter SmymbolMsaximu Unit Cathode Voltage V 2V0 Z Continous Cathode Current I 1A00 m Z Reference Input Current I 3Am REF Power Dissipation at T = 25C A SOT-23-3 P 0.37 W D SOT-23-5 0.49 Thermal Resistance SOT-23-3 336 C/W JA SOT-23-5 256 Operating Ambient Temperature Range SC431LC T 0 to +70 C A SC431LI -40 to +85 Operating Junction Temperature Range SC431LC T 0 to +150 C J SC431LI -40 to +150 Storage Temperature Range T -C65 to +150 STG Lead Temperature (Soldering) 10 seconds T 3C00 LEAD ESD Rating (Human Body Model) V 2Vk ESD Electrical Characteristics Unless specified:T = 25C. Values in bold apply over full operating ambient temperature range. A S%C431L 0.25% SC431L 0.5 PlarameterSnymboCnonditio Mpi Txy Mna Mpi Txy Msa Unit (1) RVeference Voltage V = V , I = 10mA 10.23713.2414.2410.2316.241V.24 REF Z REF Z 16.224 12.2518.22 1.25 (1) VTVemp Deviation V = V ,I = 10mA 15020152 mV REF DEV Z REF Z RIatio of Change in = 10mA, V = 16V to V -71.0-02. -71. -V2. mV/ Z Z REF V REF V V to Change in V Z REF Z Reference Input I R1 = 10k , R2 = , 05.1505. 05.1 0A. REF (2) Current I = 10mA Z I Temperature I R1 = 10k , R2 = , 04.101. 04. 0. A REF REF(DEV) (2) Deviation I = 10mA Z (3) OIff-State Cathode V = 0V, V = 6V 00.12505.15 00.120A.15 Z (OFF) REF Z (3) CVurrent = 0V, V = 16V 00.13505.15 00.13 0.15 REF Z 2008 Semtech Corp. 2 www.semtech.com