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Allegro MicroSystems APEK4402KLP-01-T-DK
- Part No.:
- APEK4402KLP-01-T-DK
- Manufacturer:
- Allegro MicroSystems
- Package:
- Datasheet:
-
APEK4402KLP-01-T-DK.pdf
- Description:
- EVAL BOARD FOR A4402
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Product details
Overview
APEK4402KLP-01-T-DK from Allegro MicroSystems is a dual-output automotive-grade power management IC integrating a constant-on-time buck regulator (up to 2 MHz) and an adjustable linear regulator (LDO), with confirmed input voltage range of 6–50 V, 250 mA LDO output, and thermal shutdown at 170°C. It delivers core and I/O rail voltages for microcontroller-based automotive control units including power steering and transmission ECUs.
For engineers reviewing the APEK4402KLP-01-T-DK datasheet, APEK4402KLP-01-T-DK pinout, APEK4402KLP-01-T-DK application, or APEK4402KLP-01-T-DK equivalent, key selection considerations include its K-grade (–40°C to 150°C ambient), integrated power-on reset with adjustable delay, watchdog timer, valley-current-mode overcurrent protection, and 16-pin eTSSOP package with exposed thermal pad.
Technical Context
The APEK4402KLP-01-T-DK implements a fixed on-time, valley-sensing current-mode buck controller operating up to 2 MHz, with on-time programmable via external resistor (RTON) and automatic period extension at VIN1 < 9.5 V or > 17 V. Its LDO is powered from the buck output and regulated via FB2 feedback with 1.180 V typical reference.
Protection includes pulse-by-pulse valley-current limiting (VISEN = –250 mV), undervoltage lockout on ENB (2.28 V typ), thermal shutdown (170°C), and open-drain NPOR fault output. The TSET pin serves dual timing roles-soft-start ramp (tSS = 60 × 104 × CTSET) and watchdog timeout (tWDI = 72 × 103 × CTSET).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6–50 V on VIN1; supports wide automotive battery transients without external pre-regulation |
| Switching Frequency | Up to 2 MHz; enables use of compact 33 µH inductors and avoids AM band EMI |
| LDO Output Current | 250 mA max; sufficient for MCU core or interface logic rails in body control modules |
| Junction Temp Limit | 150°C max; rated for under-hood operation with thermal shutdown at 170°C |
| Feedback Reference | 1.180 V (±2.0%) for both FB1 (buck) and FB2 (LDO); enables precise output voltage setting via resistive dividers |
| Quiescent Current | 6 mA max at full load; 1 µA in ENB-disabled sleep mode for low-power standby |
| Package Thermal RθJA | 34°C/W on 4-layer JEDEC PCB; enhanced heat dissipation via exposed thermal pad |
Pinout & Package
Package: 16-pin eTSSOP with exposed thermal pad (suffix LP); RoHS-compliant, 100% matte tin leadframe plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - TON | On-time programming input | Resistor-to-VIN1 sets buck on-time inversely proportional to input voltage; enables stable frequency across 6–50 V |
| 2, 14 - GND | Power ground | Dual ground pins reduce impedance; exposed pad must be soldered for thermal and electrical integrity |
| 3 - FB2 | LDO feedback input | Monitors VO2 output; 1.180 V reference enables 3.3 V or 5 V LDO configuration with standard resistor ratios |
| 4 - VIN2 | LDO bias input | Accepts 3–5.5 V supply; typically connected to buck output to maximize efficiency |
| 5 - VO2 | Adjustable LDO output | Delivers up to 250 mA; internally current-limited and UVLO-protected |
| 6 - WDI | Watchdog input | Accepts 100 kHz max clock signal; resets NPOR if no edge occurs before TSET ramp reaches 1.2 V |
| 7 - TSET | Soft-start & watchdog timing node | Capacitor sets both soft-start duration (tSS) and watchdog timeout (tWDI) via dual-current sourcing |
| 8 - NPOR | Open-drain fault/reset output | Pulled low on POR event (e.g., FB2 UVLO or watchdog timeout); requires external pull-up for MCU reset signaling |
| 9 - FB1 | Buck feedback input | Monitors VSW output; same 1.180 V reference as FB2 enables matched regulation accuracy |
| 10 - POR | Reset delay capacitor terminal | External capacitor sets POR delay (tPOR = 214 × 10³ × CPOR); adjusts reset assertion time after power-up |
| 11 - ISEN | Current sense input | Measures valley inductor current during off-time; –250 mV threshold enables accurate pulse-by-pulse OCP |
| 12 - BOOT | Bootstrap gate drive node | Drives high-side NMOS switch; requires 0.01 µF X7R ceramic capacitor rated ≥25 V |
| 13 - LX | Switch node | Connects to inductor and Schottky diode cathode; high dV/dt node requiring tight layout and ground plane isolation |
| 15 - VIN1 | Main high-voltage input | Withstands 50 V max; requires ≥10 µF bulk decoupling to suppress transients and EMI |
| 16 - ENB | Enable input | Active-high logic (2.28 V typ threshold); disables all regulators and reduces quiescent current to 1 µA |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-regulator architecture | Eliminates need for discrete buck + LDO solution; reduces BOM count, PCB area, and design validation effort |
| Automotive temperature grade (K) | Rated for –40°C to 150°C ambient; qualified per AEC-Q100 Grade 0 for under-hood applications |
| Programmable power-on reset | Adjustable delay via CPOR enables synchronization of MCU reset timing with stable LDO output |
| Valley-current-mode overcurrent protection | No slope compensation required; maintains consistent current limit across full input voltage range (6–50 V) |
| Watchdog timer with shared timing node | Single external capacitor (CTSET) configures both soft-start ramp and watchdog timeout-reducing component count |
| eTSSOP package with exposed pad | 34°C/W thermal resistance enables >1.5 W continuous power dissipation on standard 4-layer board |
Applications
| Power Steering Control Unit | Transmission Control Module |
|---|---|
|
Use Scenario: Supplies 5 V for MCU core and 3.3 V for CAN transceiver and sensor interfaces in electric power steering (EPS) systems. IC Role / Device Role / Timing Role: Dual-output PMIC providing isolated, sequenced, and monitored voltage rails with integrated POR and watchdog for functional safety compliance. Use Value: Reduces system-level BOM by replacing two discrete regulators; NPOR output directly drives MCU reset, eliminating external supervisor IC. |
Use Scenario: Powers 3.3 V microcontroller and 5 V solenoid drivers in automatic transmission control units exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-temp-rated dual regulator delivering stable rails while monitoring system health via WDI and NPOR fault signaling. Use Value: Enables single-chip power solution meeting ASIL-B requirements; thermal shutdown at 170°C prevents latch-up during prolonged high-load operation. |
| Body Control Module | Infotainment Head Unit |
|
Use Scenario: Generates 5 V for LIN transceivers and 3.3 V for microcontroller in centralized body control modules managing lighting and door functions. IC Role / Device Role / Timing Role: Automotive-grade dual regulator with ENB-controlled sequencing and UVLO-protected outputs for robust start-up in 12 V battery systems. Use Value: Supports cold-crank operation down to 6 V input; integrated ENB simplifies wake-up logic and reduces standby current to 1 µA. |
Use Scenario: Provides clean, low-noise 3.3 V for audio DSP and 5 V for display interface in center-stack infotainment systems. IC Role / Device Role / Timing Role: Dual-output regulator with independent FB loops enabling precise voltage matching and ripple rejection for sensitive analog circuits. Use Value: 2 MHz switching minimizes conducted EMI near AM radio band; ceramic output capacitors ensure low noise for audio subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-P | Single buck regulator only (no integrated LDO); requires external LDO for second rail | Lacks integrated POR, watchdog, and NPOR fault signaling; not AEC-Q100 qualified | Choose when only one regulated rail is needed and cost-per-rail is prioritized over integration and safety features |
| TPS65381A-Q1 | Triple-output PMIC (2 buck + 1 LDO); higher channel count but larger 32-pin HTSSOP package | Includes SPI interface and diagnostic registers; targets ASIL-C systems with more complex monitoring needs | Choose when system requires three independent rails or embedded diagnostics beyond basic POR/watchdog |
Compared with MPQ4420AGL-A-P and TPS65381A-Q1, the APEK4402KLP-01-T-DK uniquely balances dual-rail integration, automotive qualification, and minimal external components-making it optimal for cost-sensitive, space-constrained body electronics where functional safety up to ASIL-B is required.
Availability
APEK4402KLP-01-T-DK is available at Aetrix Electronics and suitable for automotive power steering control units, transmission control modules, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for APEK4402KLP-01-T-DK 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
Allegro MicroSystems is a U.S.-based designer of high-performance power ICs and magnetic sensors, headquartered in Manchester, NH, serving automotive, industrial, and consumer markets since 1989.
The A4402 product line delivers integrated dual-output regulators optimized for automotive body electronics, combining buck and LDO functionality with built-in functional safety features like POR, watchdog, and fault reporting to simplify ASIL-B compliant designs.
FAQ
What is the maximum ambient operating temperature for the APEK4402KLP-01-T-DK?
The APEK4402KLP-01-T-DK is rated for –40°C to 150°C ambient temperature, corresponding to the "K" grade designation. This specification is validated per AEC-Q100 stress testing and supports under-hood deployment in power steering and transmission control units where sustained high-temperature operation is required. The APEK4402KLP-01-T-DK integrates thermal shutdown at 170°C junction temperature to prevent damage during overload conditions.
How does the APEK4402KLP-01-T-DK implement overcurrent protection?
The APEK4402KLP-01-T-DK uses valley-current-mode pulse-by-pulse limiting on the buck regulator, triggered when the voltage at the ISEN pin reaches –250 mV. This method measures inductor current during the off-time, eliminating need for slope compensation and maintaining consistent current limit across 6–50 V input range. Both regulators also feature independent overcurrent protection-verified in the APEK4402KLP-01-T-DK electrical characteristics table with 250 mA LDO current limit and 740 mA buck valley current limit.
Can the APEK4402KLP-01-T-DK generate both 3.3 V and 5 V outputs simultaneously?
Yes-the APEK4402KLP-01-T-DK supports simultaneous 3.3 V and 5 V outputs using its dual feedback architecture. The buck regulator (VSW) is set via FB1 and R1/R2 divider; the LDO (VO2) is set via FB2 and R3/R4 divider. Both use the same 1.180 V internal reference, enabling precise, independent adjustment. Typical application schematics confirm 5 V buck output feeding a 3.3 V LDO, but reverse configurations (e.g., 3.3 V buck + 5 V LDO bias) are supported per VIN2 voltage constraints (3–5.5 V).
What is the purpose of the TSET pin on the APEK4402KLP-01-T-DK?
The TSET pin on the APEK4402KLP-01-T-DK serves dual timing functions: soft-start ramp generation and watchdog timeout control. When NPOR is low, TSET sources 20 µA for soft-start (tSS = 60 × 10⁴ × CTSET); when NPOR is high, it sources 10 µA for watchdog (tWDI = 72 × 10³ × CTSET). This shared node reduces external component count versus solutions requiring separate timing capacitors for each function-confirmed in the APEK4402KLP-01-T-DK functional description and timing diagrams.
Is the APEK4402KLP-01-T-DK pin-compatible with other A4402 variants?
Yes-the APEK4402KLP-01-T-DK shares identical pinout, package (16-pin eTSSOP with exposed pad), and electrical interface with all A4402 family members including A4402ELPTR-T and A4402KLPTR-T. Differences are limited to temperature grade (K vs. E), packaging format (tape-and-reel vs. demo kit), and labeling; no PCB layout changes are required when migrating between these variants. This compatibility is explicitly stated in the APEK4402KLP-01-T-DK selection guide and pinout diagram documentation.
APEK4402KLP-01-T-DK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Main Purpose:
- DC/DC, Step Down with LDO
- Outputs and Type:
- 2 Non-Isolated Outputs
- Voltage - Output:
- -
- Current - Output:
- -
- Voltage - Input:
- -
- Regulator Topology:
- 6V ~ 50V
- Frequency - Switching:
- Buck
- Contents:
- 2MHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- A4402
APEK4402KLP-01-T-DK FAQ
1.How can I place an order for APEK4402KLP-01-T-DK through Aetrix?
Please submit a Request for Quotation (RFQ) for APEK4402KLP-01-T-DK 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 APEK4402KLP-01-T-DK reliable?
The price and inventory of APEK4402KLP-01-T-DK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APEK4402KLP-01-T-DK is usually 5 days.
3.What payment methods are accepted for APEK4402KLP-01-T-DK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APEK4402KLP-01-T-DK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APEK4402KLP-01-T-DK?
APEK4402KLP-01-T-DK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APEK4402KLP-01-T-DK 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 APEK4402KLP-01-T-DK?
For technical support, including APEK4402KLP-01-T-DK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APEK4402KLP-01-T-DK requirements.
6.How does Aetrix verify that APEK4402KLP-01-T-DK is sourced from the original manufacturer or authorized distributors?
All APEK4402KLP-01-T-DK 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 APEK4402KLP-01-T-DK meets industry standards.
7.What is the process for return or replacement of APEK4402KLP-01-T-DK?
All APEK4402KLP-01-T-DK units undergo pre-shipment inspection (PSI). If there is an issue with APEK4402KLP-01-T-DK, 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 APEK4402KLP-01-T-DK part is unused and in its original packaging.
Return procedure for APEK4402KLP-01-T-DK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APEK4402KLP-01-T-DK Tags
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