TLV431A low voltage shunt regulator offers 1% tolerance in a SOT-23 package

Product Features

• Low-voltage operation...to 1.24 V
• 1% reference voltage tolerance
• Adjustable output voltage, VO = Vref to 6 V
• Low operational cathode current...80 µA
• 0.25 typical output impedance
• SOT-23 package

The TLV431A is Texas Instruments newest precision shunt voltage regulator designed to extend the features of the TL431 family to low voltage systems. The TLV431A was designed predominately to be used as the sense comparator in the control loop of low voltage DC-DC converters (see figure). It can also be configured as a shunt regulator with an output adjustable from 1.24 V to 6 V.

The TLV431A integrates a precise 1% 1.24-V reference, a voltage comparator, and a 15-mA shunt transistor. The lower reference voltage provides the headroom necessary to drive optocouplers in the feedback loop of 2.7 V to 3.3 V power supplies. Its 1% tolerance provides the required accuracy unavailable in other manufacturers' low-voltage shunt regulators.

For space sensitive applications, the TLV431A is offered in the extremely small 5-lead SOT-23 surface-mount package as well as the traditional 3-lead TO-226A (TO-92) through-hole package.

Both commercial temperature (0ºC to 70ºC) and industrial temperature (-40ºC to 85ºC) grades are available.

Other Voltage Regulators:

• Low cost 12 V boost converter Volume 13 September 1995
• Simplify designs with LDO regulator and supervisor combination Volume 13 September 1995
• 85 mV low dropout (LDO) voltage regulators Volume 12 Summer 1995
• 32-mV Low Dropout Voltage Regulator Extends Battery Life Volume 11 Spring 1995
• Power TSSOP package brings over 2W to Surface Mount Volume 11 Spring 1995
• Low Cost Solution for Switched-Mode Power Supplies Volume 11 Spring 1995

Vol 14, December, 1995

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