TLVH431_15 Datasheet, PDF (1/50 Pages) Texas Instruments – Low-Voltage Adjustable Precision Shunt Regulators

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TLVH431, TLVH431A, TLVH431B
TLVH432, TLVH432A, TLVH432B
SLVS555J – NOVEMBER 2004 – REVISED JANUARY 2015
TLVH43xx Low-Voltage Adjustable Precision Shunt Regulators
1 Features
•1 Low-Voltage Operation: Down to 1.24 V
• Reference Voltage Tolerances at 25°C
– 0.5% for B Grade
– 1% for A Grade
– 1.5% for Standard Grade
• Adjustable Output Voltage, V_O = V_REF to 18 V
• Wide Operating Cathode Current Range:
100 μA to 70 mA
• 0.25-Ω Typical Output Impedance
• –40°C to 125°C Specifications
• TLVH432 Provides Alternative Pinouts for
SOT-23-3 and SOT-89 Packages
• Ultra-Small SC-70 Package Offers 40%
Smaller Footprint than SOT-23-3
2 Applications
• Adjustable Voltage and Current Referencing
• Secondary Side Regulation in Flyback SMPSs
• Zener Replacement
• Voltage Monitoring
• Comparator with Integrated Reference
3 Description
The TLVH431 and TLVH432 devices are low-voltage
3-terminal adjustable voltage references, 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
18 V with two external resistors (see Figure 19).
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 TLVH431 and
TLVH432 devices are ideal voltage references in
isolated feedback circuits for 3-V to 3.3-V switching-
mode power supplies. They have a typical output
impedance of 0.25 Ω. Active output circuitry provides
a very sharp turn-on characteristic, making the
TLVH431 and TLVH432 devices excellent
replacements for low-voltage Zener diodes in many
applications, including on-board regulation and
adjustable power supplies.
The TLVH432 device is identical to the TLVH431
device, but is offered with different pinouts for the
SOT-23-3 and SOT-89 packages.
Device Information⁽¹⁾
PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)
SOT-23 (5)
2.90 mm × 1.60 mm
SOT-23 (3)
2.92 mm × 1.30 mm
TLVH43xx
SC70 (6)
2.00 mm × 1.25 mm
TO-92 (3)
4.30 mm × 4.30 mm
SOT-89 (3)
4.50 mm × 2.50 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.