ATL432LIBQDBZR-S Texas Instruments Inductor (SOT23 (3-Pin)) In Stock
The Texas Instruments ATL432LIBQDBZR-S is a high-bandwidth, low-Iq programmable shunt voltage regulator with adjustable reference from 1.24 V to 36 V and quiescent current under 100 µA. It features high-bandwidth error amplifier response for stable feedback loops in switching power supplies. Available in a compact SOT-23 3-pin package from authorized distributors worldwide.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- ATL432LIBQDBZR-S Datasheet PDF
- Category
- Inductor
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Programmable shunt voltage reference adjustable from 1.24 V to 36 V using two external resistors
- Low quiescent current under 100 µA minimizes standby power consumption in efficiency-critical designs
- High-bandwidth error amplifier enables stable compensation in high-frequency switch-mode power supplies
- SOT-23 3-pin package provides smallest-footprint shunt regulator solution for space-constrained boards
Applications
The ATL432LIBQDBZR-S is used as a precision voltage reference and feedback element in isolated flyback and buck converter feedback loops operating from 1.24 V to 36 V output rails. Its low Iq makes it ideal for battery-powered devices and standby power circuits where minimizing idle current extends runtime. It also serves as a precision overvoltage detection reference in power management ICs and as a shunt regulator in LED driver feedback paths.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ATL432LIBQDBZR-S:
Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3
Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3
Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3
Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3
Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3
Frequently Asked Questions
How does the ATL432LIBQDBZR-S achieve a programmable output voltage between 1.24 V and 36 V?
The ATL432LIBQDBZR-S sets its regulation voltage using a resistor divider connected to its reference (REF) pin. The output voltage follows V_out = V_ref x (1 + R1/R2), where V_ref is the internal 1.24 V bandgap reference. By selecting R1 and R2 from standard E96 series resistors, designers can program any output voltage from 1.24 V to 36 V with accuracy limited only by resistor tolerance and the internal reference error.
For an isolated flyback converter operating at 200 kHz, how does the ATL432LIBQDBZR-S high-bandwidth error amplifier improve loop stability?
In a 200 kHz flyback converter, the compensation network between the ATL432LIBQDBZR-S and optocoupler must inject enough phase lead to maintain 45° phase margin. The ATL432LIBQDBZR-S's high-bandwidth error amplifier, with a gain-bandwidth product exceeding 1 MHz, allows the designer to place compensation zeros well above the power stage crossover frequency of 20 kHz, avoiding the sluggish transient response that lower-bandwidth references produce in similar topologies.
In a 5 V standby rail for a home appliance, how much idle power does ATL432LIBQDBZR-S save compared to the standard TL431?
The standard TL431 requires a minimum cathode current of 1 mA to regulate, while the ATL432LIBQDBZR-S operates with quiescent current below 100 µA. On a 5 V standby rail, this difference saves approximately 4.5 mW of continuous idle power per unit. Over a product lifetime of 10 years at 8,760 hours/year, the saving amounts to roughly 0.39 kWh per appliance, contributing meaningfully to ErP Tier 2 standby power compliance.
What makes ATL432LIBQDBZR-S preferable to a fixed LDO regulator in a multi-rail power design needing precision trimming?
A fixed LDO locks output voltage at manufacture, requiring a different part number for each target voltage. The ATL432LIBQDBZR-S's 1.24 V to 36 V programmable range with two external resistors covers all secondary rails in a multi-output supply from a single component, reducing BOM complexity and inventory cost. Its shunt topology also eliminates dropout voltage constraints that limit LDO performance when input-output differential is small.
Related Guides
ECMF02-4CMX8 Common-Mode Filter with ESD Protection: Selection Guide
Compare ECMF02-4CMX8 vs ECMF02-2AMX6, ECMF04-4HSM10, and other ST ECMF filters. Choose the right 4-channel common-mode filter with ESD protection for USB 2.0.
Jun 20, 2026
AD5204 Quad Digital Potentiometer Selection Guide (2026)
How to choose the right AD5204 quad digital potentiometer: compare 10kΩ vs 100kΩ variants, TSSOP vs SOIC packages, and SPI interface options for your design.
Jun 20, 2026
0402 10uF X5R Decoupling Design Guide for Compact Digital Rails
Application note for using CL05A106MP5NUNC-class 0402 10uF X5R MLCCs in compact digital rail decoupling designs.
Jun 19, 2026
How to Choose an 0805 10uF MLCC for Decoupling and Bulk Capacitance
Selection guide for choosing 0805 10uF MLCCs around CL21A106KOQNNNE, covering derating, dielectric, package, and sourcing checks.
Jun 19, 2026
Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”