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Allegro MicroSystems A4405KLPTR-T
- Part No.:
- A4405KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A4405KLPTR-T.pdf
- Description:
- IC REG QUAD BUCK/LINEAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,970
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Product details
Overview
A4405KLPTR-T from Allegro MicroSystems is a constant-on-time automotive regulator that integrates a 2.2MHz buck pre-regulator, two 5V linear regulator outputs, and a 3.3V DMOS driver. The device is designed for underhood and vehicle electronics that need compact multi-rail power from a harsh automotive input supply.
As part of the Allegro A4405 product family, A4405KLPTR-T combines a wide 5.5V to 36V operating range, 50V surge tolerance, AEC-Q100 Grade 0 qualification, and protection behavior for load-dump and start-stop environments. For engineers reviewing the A4405KLPTR-T datasheet, A4405KLPTR-T pinout, A4405KLPTR-T application, or A4405KLPTR-T equivalent, this device is widely used in automotive control modules, underhood electronics, body-control systems, infotainment supplies, sensor power rails, and rugged embedded power architectures.
Technical Context
In automotive power systems, A4405KLPTR-T uses a high-frequency buck pre-regulator to generate an intermediate rail before supplying integrated 5V regulator functions and the 3.3V DMOS driver rail. This structure reduces the number of separate ICs required for protected vehicle power trees.
The 5.5V to 36V operating range supports battery, cold-crank, and load-dump related design conditions, while the 2.2MHz switching frequency allows smaller magnetics and capacitors in space-constrained modules. The Grade 0 temperature capability supports high-ambient underhood electronics.
A4405KLPTR-T is commonly used when an automotive module needs an integrated buck-plus-linear regulator solution with short-to-battery protection, robust fault handling, and a 20-pin TSSOP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | Constant-on-time automotive regulator with buck pre-regulator, linear regulators, and 3.3V DMOS driver. |
| Input Voltage Range | 5.5V to 36V operating range with 50V maximum surge capability. |
| Switching Frequency | 2.2MHz buck regulator operation. |
| Regulated Outputs | Buck pre-regulator, two 5V linear regulators, and 3.3V driver rail. |
| Qualification | AEC-Q100 Grade 0 automotive qualification. |
| Temperature Range | -40C to +150C junction temperature range. |
| Package / Packing | 20-pin TSSOP, KLPTR-T tape-and-reel orderable option. |
Pinout & Package
The A4405KLPTR-T pinout is organized around input supply, regulator drive or switching-control pins, feedback and sense nodes, logic control pins, monitoring outputs, and ground connections.
For PCB design, power paths should be short, feedback traces should be kept away from switching edges, and controller grounds should return through a low-impedance layout.
| Pin / Function | PCB Design and Circuit Role |
|---|---|
| VIN | Automotive input supply for the regulator system. |
| SW / Buck Drive | Switching node and drive path for the buck pre-regulator. |
| V5 / 5V Outputs | Integrated 5V regulator outputs for system rails. |
| V33 / DMOS Driver | 3.3V driver rail function. |
| EN / Logic Control | Control and enable sequencing functions. |
| GND / Thermal Pins | Ground return and thermal path for automotive operation. |
Key Features
- 2.2MHz constant-on-time buck operation supports compact external components.
- Wide automotive input range supports cold-crank and load-dump conditions.
- Integrated 5V regulators reduce discrete rail count.
- 3.3V DMOS driver rail supports protected switching functions.
- AEC-Q100 Grade 0 capability supports high-temperature vehicle modules.
- Short-to-battery and fault-protection behavior improves automotive robustness.
Applications
| Underhood Control Modules | Body Electronics |
|---|---|
|
Use Scenario: Used in high-temperature vehicle electronics. IC Role: Generates protected local regulator rails. Use Value: Supports rugged automotive power trees. |
Use Scenario: Used in distributed vehicle body-control systems. IC Role: Provides 5V and 3.3V support rails. Use Value: Reduces external regulator count. |
| Infotainment Supplies | Sensor Power Systems |
|
Use Scenario: Used in automotive multimedia and interface modules. IC Role: Supplies logic and auxiliary rails. Use Value: Improves compact rail integration. |
Use Scenario: Used in automotive sensor and actuator electronics. IC Role: Regulates from noisy battery-related inputs. Use Value: Improves protection and layout density. |
Equivalent & Alternatives
When evaluating a A4405KLPTR-T equivalent, engineers should compare output count, input-voltage range, current capability, controller topology, package, fault monitoring, sequencing behavior, and lifecycle status.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A8450KLBTR-T | Allegro multi-output automotive regulator with a different four-output rail structure. | Used in automotive multi-rail modules. | Compare output count, current rating, and package. |
| MAX20049ATEB/VY+ | ADI/Maxim automotive PMIC with dual buck and dual LDO rails for camera or sensor systems. | Used in automotive camera and ADAS modules. | Compare rail voltages, input range, and package. |
Compared with A8450KLBTR-T, A4405KLPTR-T focuses on a constant-on-time buck pre-regulator with integrated 5V regulators and a 3.3V driver rail. A4405KLPTR-T vs MAX20049ATEB/VY+ selection depends on automotive rail count, output-voltage requirements, package, and target module architecture.
Quality
A4405KLPTR-T should be sourced as original Allegro MicroSystems components through traceable supply channels. Quality checks may include package inspection, marking validation, solderability testing, regulator startup verification, output accuracy checks, and thermal inspection.
Production validation should include load transients, startup order, fault response, output ripple, thermal rise, and PCB layout review for switching or high-current paths.
Availability
A4405KLPTR-T available at Aetrix Electronics and is suitable for automotive, computing, industrial, embedded, communication, and legacy multi-rail power platforms.
Supply support may include volume procurement planning, scheduled delivery arrangements, traceable sourcing management, and long-term supply support for OEM, industrial electronics, automotive electronics, and embedded product programs. Sample and NPI supply support, as well as urgent in-stock supply support, can also be arranged for prototype builds, pilot runs, and time-critical production needs.
For production builds, confirming package, output configuration, lifecycle status, lead time, and sourcing continuity helps reduce procurement risk.
Manufacturer
Allegro MicroSystems is a semiconductor manufacturer specializing in magnetic sensors, power ICs, motor drivers, current sensors, and automotive and industrial interface products.
The A4405 product family is an Allegro automotive regulator family for systems requiring a high-frequency buck pre-regulator, integrated 5V regulation, and robust vehicle-input protection.
FAQ
What is A4405KLPTR-T used for?
A4405KLPTR-T is used for multi-rail power management, regulator control, sequencing, and protected power conversion in systems matching its datasheet architecture.
Where can I find the A4405KLPTR-T datasheet download?
The A4405KLPTR-T datasheet is available from Allegro MicroSystems or authorized distributor documentation.
What should be considered in A4405KLPTR-T pinout design?
Designers should keep regulator drive paths compact, separate noisy switching nodes from feedback traces, and provide stable grounding for monitoring and control pins.
What are common A4405KLPTR-T equivalent solutions?
Common candidates include A8450KLBTR-T and MAX20049ATEB/VY+ depending on rail count, topology, current rating, package, and lifecycle constraints.
A4405KLPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (3)
- Number of Outputs:
- 4
- Frequency - Switching:
- 2.2MHz
- Voltage/Current - Output 1:
- 5.45V, 2.5A
- Voltage/Current - Output 2:
- 5V
- Voltage/Current - Output 3:
- 3.3V, 500mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 5.5V ~ 36V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
A4405KLPTR-T FAQ
1.How can I place an order for A4405KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4405KLPTR-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for A4405KLPTR-T reliable?
The price and inventory of A4405KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A4405KLPTR-T is usually 5 days.
3.What payment methods are accepted for A4405KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4405KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4405KLPTR-T?
A4405KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4405KLPTR-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for A4405KLPTR-T?
For technical support, including A4405KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4405KLPTR-T requirements.
6.How does Aetrix verify that A4405KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A4405KLPTR-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A4405KLPTR-T meets industry standards.
7.What is the process for return or replacement of A4405KLPTR-T?
All A4405KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A4405KLPTR-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The A4405KLPTR-T part is unused and in its original packaging.
Return procedure for A4405KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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