View lm431sb datasheet:

www.fairchildsemi.com LM431SA/LM431SB/LM431SC Programmable Shunt Regulator Features Description • Programmable Output Voltage to 36 Volts The LM431SA/LM431SB/LM431SC are three terminal • Low Dynamic Output Impedance 0.20 Typical output adjustable regulators with thermal stability over • Sink Current Capability of 1.0 to 100mA operating temperature range. The output voltage can be set • Equivalent Full-Range Temperature Coefficient of any value between V (approximately 2.5 volts) and 36 REF 50ppm/°C Typical volts with two external resistors. These devices have a • Temperature Compensated for Operation Over Full Rated typical dynamic output impedance of 0.2? Active output Operating Temperature Range circuit provides a sharp turn-on characteristic, making these • Low Output Noi