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

ATL431 (ACTIVE) 2.5V low-Iq adjustable precision shunt regulator

 

Recommended alternative parts

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

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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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

Parametrics

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Part number Order 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 Order now Adjustable     2.5     2.5     36     0.5
1    
92     Catalog     -40 to 125
-40 to 85    
20     100     SOT-23 | 3     0.15     0.05    
ATL431LI Order now Adjustable     2.5     2.5     36     0.5
1    
66     Catalog     -40 to 125
-40 to 85    
80     15     SOT-23 | 3
X2SON | 4    
0.4     0.3    
ATL432 Order now Adjustable     2.5     2.5     36     0.5
1    
92     Catalog     -40 to 125
-40 to 85    
20     100     SOT-23 | 3     0.15     0.05    
ATL432LI Order now Adjustable     2.5     2.5     36     0.5
1    
66     Catalog     -40 to 85
-40 to 125    
80     15     SOT-23 | 3     0.4     0.3    
TL431 Order now Adjustable     2.495     2.495     36     0.5
1
2    
92     Catalog     -40 to 85
-40 to 125
0 to 70    
400     100     PDIP | 8
SC70 | 6
SOIC | 8
SOT-23 | 3
SOT-23 | 5
SOT-89 | 3
SO | 8
TO-92 | 3
TSSOP | 8    
4     2.5    
TL431LI Order now Adjustable     2.495     2.495     36     0.5
1    
63     Catalog     -40 to 125
-40 to 85
0 to 70    
400     15     SOT-23 | 3     0.4     0.3    
TL432LI Order now Adjustable     2.495     2.495     36     0.5
1    
63     Catalog     -40 to 85
-40 to 125
0 to 70    
400     15