TLV431_15 Datasheet, PDF (1/46 Pages) Texas Instruments – TLV431x Low-Voltage Adjustable Precision Shunt Regulator

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TLV431, TLV431A, TLV431B
SLVS139V – JULY 1996 – REVISED JANUARY 2015
TLV431x Low-Voltage Adjustable Precision Shunt Regulator
1 Features
•1 Low-Voltage Operation, V_REF = 1.24 V
• Adjustable Output Voltage, V_O = V_REF to 6 V
• Reference Voltage Tolerances at 25°C
– 0.5% for TLV431B
– 1% for TLV431A
– 1.5% for TLV431
• Typical Temperature Drift
– 4 mV (0°C to 70°C)
– 6 mV (–40°C to 85°C)
– 11 mV (–40°C to 125°C)
• Low Operational Cathode Current, 80 µA Typ
• 0.25-Ω Typical Output Impedance
• Ultra-Small SC-70 Package Offers 40% Smaller
Footprint Than SOT-23-3
• See TLVH431 and TLVH432 for:
– Wider V_KA (1.24 V to 18 V) and I_K (80 mA)
– Additional SOT-89 Package
– Multiple Pinouts for SOT-23-3 and SOT-89
Packages
• On Products Compliant to MIL-PRF-38535,
All Parameters Are Tested Unless Otherwise
Noted. On All Other Products, Production
Processing Does Not Necessarily Include Testing
of All Parameters.
2 Applications
• Adjustable Voltage and Current Referencing
• Secondary Side Regulation in Flyback SMPSs
• Zener Replacement
• Voltage Monitoring
• Comparator with Integrated Reference
3 Description
The TLV431 device is a low-voltage 3-terminal
adjustable voltage reference with specified thermal
stability over applicable industrial and commercial
temperature ranges. Output voltage can be set to any
value between V_REF (1.24 V) and 6 V with two
external resistors (see Figure 20). These devices
operate from a lower voltage (1.24 V) than the widely
used TL431 and TL1431 shunt-regulator references.
When used with an optocoupler, the TLV431 device
is an ideal voltage reference in isolated feedback
circuits for 3-V to 3.3-V switching-mode power
supplies. These devices have a typical output
impedance of 0.25 Ω. Active output circuitry provides
a very sharp turn-on characteristic, making them
excellent replacements for low-voltage Zener diodes
in many applications, including on-board regulation
and adjustable power supplies.
Device Information⁽¹⁾
PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)
SOT-23 (3)
2.90 mm x 1.30 mm
SOT-23 (5)
2.90 mm x 1.60 mm
TLV431x
SC70 (6)
2.00 mm x 1.25 mm
TO-92 (3)
4.30 mm × 4.30 mm
SOIC (8)
4.90 mm x 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
Input
V_O
I_K
V_REF
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.