L4931ABD33

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The L4931ABD33 is a very low drop voltage regulator manufactured by STMicroelectronics, designed for low noise and low power applications. It features a dropout voltage of 0.4 V and a quiescent current of 50 µA in OFF mode and 600 µA in ON mode. The device provides an output current up to 250 mA with a fixed 3.3 V output. It operates within an input voltage range of 2 V to 20 V and supports a temperature range from -40 °C to +125 °C. The component utilizes a TTL compatible shutdown logic control function and requires only a 2.2 µF capacitor for stability.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Very low dropout voltage (0.4 V) suitable for battery-powered systems
• Logic controlled electronic shutdown for standby mode operation
• Internal current and thermal limit protection functions

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Low noise, low power applications
• Battery-powered systems
• Local regulators requiring board standby modes

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'AB' indicates the ±1% output voltage selection at 25 °C as documented for the L4931 family. Confirm package availability and lifecycle status through official STMicroelectronics channels or authorized distributors, as supply conditions vary. Ensure compatibility with required PCB footprint and thermal management strategies for the selected package type.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 3.3 V output with high precision (±1%) is required alongside minimal quiescent current consumption. The inclusion of a shutdown pin makes it suitable for portable devices where power conservation in standby is critical. Verify that the external capacitor value meets the minimum 2.2 µF requirement for stability across the operating temperature range.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

The L4931 series comprises very low drop regulators available in SO-8, DPAK, and TO-92 packages. The L4931ABD33 specifically denotes the AB grade for tighter voltage tolerance and likely the D package variant. This series is engineered to reduce total power consumption in portable electronics by allowing parts of the circuit to enter standby mode via logic control.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes include other L4931 variants with different output voltages or package types, such as L4931CD33 or L4931CV33, provided the voltage accuracy and physical footprint requirements are met. Cross-referencing datasheets is necessary to confirm pinout compatibility and electrical parameter alignment.