A4405KLPTR-T

Voltage Regulators - Linear + Switching Overview

The A4405KLPTR-T is an automotive power management IC featuring a high-frequency constant on-time buck pre-regulator and three linear regulator outputs. It operates within a 5.5 V to 36 V input range, with a maximum voltage of 50 V. The device includes two internal 5 V LDOs and one 3.3 V DMOS driver capable of up to 500 mA. It utilizes a 2.2 MHz switching frequency and supports junction temperatures from -40°C to 150°C. The component is housed in a 16-lead TSSOP package with an exposed pad.

Voltage Regulators - Linear + Switching Feature Summary

• Integrates a buck pre-regulator followed by low dropout linear regulators to reduce power dissipation and increase efficiency.
• Includes a programmable current limit for the external 3.3 V DMOS driver with overcurrent foldback protection.
• Features logic enable, ignition enable inputs, and an ignition status indicator for system control.

Voltage Regulators - Linear + Switching Applications

• CAN bus power supply
• Microprocessor power supply
• Under hood automotive applications

Voltage Regulators - Linear + Switching Procurement Notes

Verify the specific suffix against official Allegro MicroSystems documentation to confirm pinout and electrical characteristics. Ensure the selected variant meets the required thermal performance for under-hood environments. Confirm RoHS compliance and AEC-Q100 Grade 0 qualification status prior to integration into the design.

Voltage Regulators - Linear + Switching Selection Notes

Select this component when designing for high-temperature automotive environments requiring efficient voltage regulation. The integrated buck pre-regulator is suitable for dropping higher input voltages before linear regulation. Consider the 50 V surge capability for load dump scenarios. Evaluate the 2.2 MHz switching frequency for EMI constraints.

Voltage Regulators - Linear + Switching Part Context

This part belongs to the A4405 family of automotive power management ICs designed for under-hood use. It combines switching and linear technologies to provide stable power for sensitive digital components like microprocessors and communication controllers in harsh automotive conditions.

Voltage Regulators - Linear + Switching Replacement Considerations

Consult official Allegro MicroSystems substitution guides for verified alternatives. Generic replacements may not match the specific AEC-Q100 Grade 0 qualification or the unique combination of buck pre-regulation and DMOS driver features.

Voltage Regulators - Linear + Switching FAQ

What is the maximum input voltage for the A4405KLPTR-T?

The absolute maximum input voltage is 50 V, which accommodates load dump requirements.

Does the A4405 include protection features for its outputs?

Yes, it includes overcurrent foldback protection for the 5 V LDOs and short-to-battery protection for the tracking 5 V regulator.