ATL431 2.5-V low-Iq adjustable precision shunt regulator | TI.com

ATL431 (ACTIVE)

2.5-V low-Iq adjustable precision shunt regulator

 

Recommended alternative parts

  • ATL431LI  -  The ATL431LI low-Iq adjustable shunt reference offers higher bandwidth

Special note

Read about TL431LI: Designing with the Improved TL431LI

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 consistent voltage regulation 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.

Features

  • Adjustable Regulated Output of 2.5 V to 36 V
  • Very-Low Operating Current
    • IKA(min) = 35 µA (Max)
    • IREF = 150 nA (Max)
  • Internally Compensated for Stability
    • Stable With No Capacitive Load
  • Reference Voltage Tolerances at 25°C
    • 0.5% for B Grade
    • 1% for A Grade
  • 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)

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Parametrics Compare all products in Shunt voltage references

 
Reference voltage
VO (V)
VO adj (Min) (V)
VO adj (Max) (V)
Initial accuracy (Max) (%)
Temp Coeff (Max) (ppm/ degree C)
Rating
Operating temperature range (C)
Iz for regulation (Min) (uA)
Iout/Iz (Max) (mA)
Package Group
Iref (uA)
I I(dev) (uA)
ATL431 ATL431LI ATL432 ATL432LI TL431 TL431LI TL432LI
Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable    
2.5     2.5     2.5     2.5     2.495     2.495     2.495    
2.5     2.5     2.5     2.5     2.495     2.495     2.495    
36     36     36     36     36     36     36    
0.5
1    
0.5
1    
0.5
1    
0.5
1    
0.5
1
2    
0.5
1    
0.5
1    
92     92     92     92     92     63     63    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125
-40 to 85    
-40 to 125
-40 to 85    
-40 to 125     -40 to 85
-40 to 125    
-40 to 85
-40 to 125
0 to 70    
-40 to 125
-40 to 85
0 to 70    
-40 to 85
-40 to 125
0 to 70    
20     80     20     80     400     400     400    
100     15     100     15     100     15     15    
SOT-23 | 3     SOT-23 | 3     SOT-23 | 3     SOT-23 | 3     PDIP | 8
SC70 | 6
SOIC | 8
SOT-23 | 3
SOT-23 | 5
SOT-89 | 3
SO | 8
TO-92 | 3
TSSOP | 8    
SOT-23 | 3     SOT-23 | 3    
0.15     0.8     0.15     0.8     4     0.8     0.8    
0.05     0.4     0.05     0.4     2.5     0.4     0.4    

Design tool

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WEBENCH® Designer ATL431

  Min   Max Range
Vin  V 2.6 to 36.0V
Vout  V 2.501 to 36V
Iout  A ≤ 0.1A
Ambient Temp  °C -40 to 125°C