Texas Instruments ATL432LIBIDBZR

Overview

ATL432LIBIDBZR from Texas Instruments is a precision programmable shunt regulator with 0.5% initial reference voltage tolerance at 25°C, adjustable output voltage from 2.5 V to 36 V, and sink-current capability up to 15 mA. It operates across −40°C to +125°C (Q-temp grade) and features 0.3 Ω typical dynamic impedance, making it suitable for secondary-side regulation in isolated flyback converters.

For engineers reviewing the ATL432LIBIDBZR datasheet, ATL432LIBIDBZR pinout, ATL432LIBIDBZR application, or ATL432LIBIDBZR equivalent, key selection considerations include cathode current range (0.08–15 mA), reference input current ≤0.4 µA, temperature drift ≤27 mV over full Q-temp range, and SOT-23-3 DBZ package compatibility with space-constrained industrial and automotive power designs.

Technical Context

The ATL432LIBIDBZR implements a three-terminal shunt architecture with an internal 2.5-V bandgap reference and high-gain error amplifier driving a Darlington output stage. Its open-loop comparator mode enables undervoltage/overvoltage monitoring, while closed-loop operation with external resistive feedback provides precise voltage or current regulation.

Unlike standard Zener diodes, it delivers sharp turn-on characteristics and stable regulation down to 80 µA minimum cathode current. The device is internally compensated for stability without an output capacitor and supports operation with load capacitance up to 10 µF when configured per published stability boundary conditions.

Key Specifications

Pinout & Package

ATL432LIBIDBZR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, optimized for automated assembly and thermal performance on standard PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt regulator applications.

Compared with TL432LIBIDBZR, ATL432LIBIDBZR achieves lower minimum operating current for extended light-load efficiency; compared with ATL431LIBIDBZR, it retains identical performance while matching the TL432LI pinout - simplifying migration from legacy TI shunt regulators in production designs.

Availability

ATL432LIBIDBZR is available at Aetrix Electronics and suitable for automotive power management, industrial isolated SMPS, and precision analog monitoring requiring stable component supply and long-term lifecycle continuity.

Supply support for ATL432LIBIDBZR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The ATL43xLI product line was developed to replace Zener diodes with high-accuracy, low-drift, programmable shunt regulators for feedback, monitoring, and precision current-sink applications across harsh-environment systems.

FAQ

What is the maximum cathode voltage rating for ATL432LIBIDBZR?

The absolute maximum cathode-to-anode voltage (V_KA) for ATL432LIBIDBZR is 37 V. Operation above 36 V violates recommended conditions and risks permanent damage. For reliable long-term use in flyback designs, maintain V_KA ≤36 V with appropriate derating margin - especially under transient or startup conditions where overshoot may occur. This limit is defined in Section 7.1 of the SLVSDU6D datasheet.

Does ATL432LIBIDBZR require an external capacitor for stability?

No, ATL432LIBIDBZR is internally compensated and does not require an external capacitor for basic stability. However, if a load capacitor is used (e.g., for noise filtering), its value must be selected per the stability boundary charts in Figures 13 and 15 of the SLVSDU6D datasheet - typically ≤100 nF for I_KA > 1 mA. Uncontrolled capacitance can induce oscillation, so validation under actual operating conditions is essential.

How does the pinout of ATL432LIBIDBZR differ from ATL431LIBIDBZR?

ATL432LIBIDBZR uses CATHODE–REF–ANODE pin order (Pin 1–2–3) in the SOT-23-3 DBZ package, whereas ATL431LIBIDBZR uses REF–CATHODE–ANODE (Pin 1–2–3). This difference is explicitly documented in Section 6 of SLVSDU6D. Using ATL431LI in a board designed for ATL432LI - or vice versa - will result in incorrect feedback connection and failure to regulate. Always verify footprint alignment before layout reuse.

What is the minimum cathode current needed for regulation in ATL432LIBIDBZR?

The maximum specified minimum cathode current (I_min) for ATL432LIBIDBZR is 80 µA at 25°C - meaning regulation is guaranteed when I_KA ≥80 µA. Below this, the device may exit linear region and lose regulation accuracy. This value increases slightly over temperature; design margins should target ≥100 µA for robust operation across −40°C to +125°C. Data appears in Table 7.5 (Electrical Characteristics) of SLVSDU6D.

Can ATL432LIBIDBZR be used as a comparator?

Yes, ATL432LIBIDBZR functions as a high-gain comparator with integrated 2.5-V reference when operated open-loop - i.e., without feedback from CATHODE to REF. In this mode, it compares the REF pin voltage to the internal reference and drives CATHODE low when the threshold is exceeded. Response time depends on cathode current; ≥1 mA yields fast switching. Application guidance is provided in Section 11.2.1 and Figure 23 of SLVSDU6D.