ATL431_16 Datasheet, PDF (1/26 Pages) Texas Instruments – ATL43x 2.5-V Low Iq Adjustable Precision Shunt Regulator

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ATL431, ATL432
SLVSCV5C – MARCH 2015 – REVISED SEPTEMBER 2015
ATL43x 2.5-V Low Iq Adjustable Precision Shunt Regulator
1 Features
•1 Adjustable Regulated Output of 2.5 V to 36 V
• Very-Low Operating Current
– I_KA(min) = 35 µA (Max)
– I_REF = 150 nA (Max)
• Internally Compensated for Stability
– Stable With No Capacitive Load
• Reference Voltage Tolerances at 25°C
– 0.5% for ATL43xB
– 1% for ATL43xA
• Typical Temperature Drift
– 5 mV (–40°C to 85°C); I Version
– 6 mV (–40°C to 125°C); Q Version
• Extended Cathode Current Range
35 µA to 100 mA
• Low Output Impedance of 0.3 Ω (Max)
2 Applications
• Secondary Side Regulation in Flyback SMPSs
• Industrial, Computing, Consumer, and Portables
• Adjustable Voltage and Current Referencing
• Power Management
• Power Isolation
• Zener Replacement
3 Description
The ATL431 and ATL432 are three-terminal
adjustable shunt regulators, with specified thermal
stability over applicable automotive, commercial, and
industrial temperature ranges. The output voltage can
be set to any value between Vref (approximately
2.5 V) and 36 V, with two external resistors. These
devices have a typical output impedance of 0.05 Ω.
Active output circuitry provides a very sharp turn-on
characteristic, making these devices excellent
replacements for Zener diodes in many applications,
such as onboard regulation, adjustable power
supplies, and switching power supplies.
The ATL43x has > 20x improvement cathode current
range over it's TL43x predecessor. It also is stable
with a wider range of load capacitance types and
values.
ATL431 and ATL432 are the exact same parts but
with different pinouts and order numbers. The
ATL43x is offered in two grades, with initial
tolerances (at 25°C) of 0.5%, 1%, for the B and A
grade, respectively. In addition, low output drift vs
temperature ensures good stability over the entire
temperature range.
The ATL43xxI devices are characterized for operation
from –40°C to 85°C, and the ATL43xxQ devices are
characterized for operation from –40°C to 125°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ATL431
ATL432
SOT (3)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
Input
V_KA
I_KA
Stability Region for V_KA = 15.0 V
2000
1000
V_ref
STABLE
100
20
0.0001
0.001
0.01
0.1
1
10
C_KA(2F)
D001
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.