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Allegro MicroSystems APEK8650KEJ-01-MH

Name: APEK8650KEJ-01-MH
Brand: Allegro MicroSystems
SKU: APEK8650KEJ-01-MH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APEK8650KEJ-01-MH

Manufacturer:: Allegro MicroSystems

Category:: DC/DC & AC/DC (Off-Line) SMPS Evaluation Boards

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Datasheet:: APEK8650KEJ-01-MH.pdf

Description:: EVAL BOARD FOR A8650

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Product details

Overview

APEK8650KEJ-01-MH from Allegro MicroSystems is an automotive-grade, synchronous buck regulator integrating 70 mΩ high-side P-channel and 55 mΩ low-side N-channel MOSFETs. It delivers ≥2.0 A continuous output current, supports input voltage range 2.5–5.5 V, regulates down to 0.8 V with ±1% reference accuracy (–40°C to 125°C), and features externally adjustable switching frequency (250 kHz–2.45 MHz). It is used in GPS/infotainment power rails requiring compact, thermally robust DC/DC conversion.

For engineers reviewing the APEK8650KEJ-01-MH datasheet, APEK8650KEJ-01-MH pinout, APEK8650KEJ-01-MH application, or APEK8650KEJ-01-MH equivalent, key selection criteria include its AEC-Q100 qualification, EN/SYNC-controlled enable/synchronization, Power OK (POK) status signaling, sleep mode current <3 μA, and thermal shutdown at 170°C typical - all critical for automotive infotainment and audio subsystems.

Technical Context

The APEK8650KEJ-01-MH employs current-mode control with transconductance error amplifier (gm = 750 μA/V typ), internal slope compensation scaled to fOSC, and PWM comparator with 65 ns minimum on-time. Its dual-MOSFET architecture enables CCM operation across load range, minimizing EMI via continuous low-side conduction.

It integrates cycle-by-cycle overcurrent protection (ILIM = 4.1 A at 5% duty cycle), hiccup-mode short-circuit response (7 OCP events), UVLO (2.25 V stop threshold), and pin-fault tolerance (open/short-to-ground/adjacent-pin). The COMP pin supports external RC+CP compensation for stability across ceramic-capacitor-based output stages.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5 V to 5.5 V - supports direct connection to automotive 3.3 V or 5 V rails without pre-regulation.
Output Voltage Accuracy	±1% from –40°C to 125°C - ensures stable core voltage for DSPs and SoCs in temperature-varying cabin environments.
Switching Frequency Range	0.25 MHz to 2.45 MHz - enables EMI optimization and small external component selection (e.g., 1.0 µH inductor).
Max Output Current	≥2.0 A continuous - sufficient for powering audio amplifiers, GPS baseband ICs, or multi-core infotainment processors.
High-Side R_DS(on)	70 mΩ @ 25°C - limits conduction loss to ≤280 mW at 2 A, supporting thermal performance in DFN package.
Sleep Mode Current	<3 μA - enables ultra-low quiescent power during vehicle ignition-off states without battery drain.
Thermal Shutdown	170°C typical - protects against sustained overload or poor PCB heatsinking in enclosed head-unit enclosures.

Pinout & Package

Package: 10-pin DFN with exposed thermal pad (suffix EJ), 3.0 mm × 3.0 mm × 0.8 mm, RoHS-compliant, 100% matte tin leadframe plating.

Pin/Terminal	Circuit Role	Design Meaning
SW	Switch node	Drain connection of both internal MOSFETs; must be routed with minimal loop area to LO and PGND to suppress EMI.
PGND	Power ground	Low-impedance return path for high di/dt switch currents; requires direct connection to thermal pad vias.
EN/SYNC	Enable & sync input	Logic-level enable (V_H = 1.8 V max); also accepts external clock (1.2×–1.5× f_OSC) for system-wide timing alignment.
POK	Power OK open-drain	Signals V_OUT regulation status (92%–95% V_REF); requires external pull-up for MCU reset or sequencing control.
FSET	Frequency setting	Resistor-to-GND sets base f_OSC; 10.7 kΩ yields ~2 MHz - critical for noise-sensitive audio band avoidance.
COMP	Error amp output	Compensation node for current-mode loop; connects to R_Z/C_Z/C_P network to stabilize transient response.
FB	Feedback input	Monitors output via resistor divider; regulates to 800 mV reference - enables precise 1.8 V, 1.2 V, or 0.85 V rail generation.
SS	Soft start control	Capacitor-to-GND sets ramp time and hiccup period; 10 nF yields ~880 µs soft start - prevents inrush into downstream capacitors.
GND	Analog ground	Reference for FB, COMP, SS; must be star-connected to PGND near device to avoid noise coupling.
VIN	Input supply	Supplies control circuitry and high-side MOSFET source; requires local 3.3 µF ceramic capacitor per datasheet layout guidelines.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for –40°C to +125°C ambient operation - meets automotive infotainment reliability requirements without derating.
Pre-biased startup capability	Allows safe turn-on when output is pre-charged (e.g., by backup rail), preventing reverse current flow through low-side MOSFET.
Stable with ceramic output capacitors	Eliminates need for electrolytic or tantalum caps - reduces board area, improves lifetime, and avoids ESR-related instability.
Pin-fault tolerant design	Withstands open-circuit, adjacent-pin short, and short-to-ground faults at every pin - satisfies ASIL-B functional safety constraints.
Externally adjustable compensation	Enables loop tuning for diverse output capacitor ESR/ESL and inductor DCR values - essential for production margin validation.

Applications

GPS Module Power Supply	Automotive Infotainment SoC Core Rail
Use Scenario: Powers GNSS receiver IC (e.g., u-blox UBX-M8030) requiring clean 1.8 V at up to 1.5 A in dashboard-mounted units. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage with fast load-step response to handle RF acquisition bursts. Use Value: 2.45 MHz max switching frequency avoids AM/FM radio bands; ±1% V_REF ensures consistent GPS lock time across temperature.	Use Scenario: Supplies 1.2 V core rail to application processor (e.g., NXP i.MX8QuadMax) in head-unit mainboard with tight thermal envelope. IC Role / Device Role / Timing Role: High-current, thermally optimized DC/DC converter with exposed-pad DFN package enabling >1.5 W dissipation on 4-layer PCB. Use Value: 45 °C/W θ_JA (DFN) and 70 mΩ/55 mΩ MOSFETs reduce junction rise to <40°C at 2 A - avoids thermal throttling during video playback.
Automotive Audio Amplifier Bias	Telematics Control Unit (TCU) I/O Rail
Use Scenario: Generates 3.3 V bias for Class-D audio amplifier (e.g., TI TPA6304) in rear-seat entertainment systems. IC Role / Device Role / Timing Role: Secondary buck regulator with EN/SYNC synchronized to main SoC clock to minimize beat-frequency noise in analog audio paths. Use Value: Synchronization range (1.2×–1.5× f_OSC) allows locking to 1.8 MHz system clock - eliminates audible whine in speaker output.	Use Scenario: Provides isolated 2.5 V I/O rail for LTE modem and CAN transceiver in connected vehicle gateways. IC Role / Device Role / Timing Role: Fault-resilient regulator with hiccup-mode OCP and POK signaling to support fail-safe communication stack restart. Use Value: Open/short-tolerant pins and 7-event hiccup counter prevent latch-up during CAN bus ESD events - maintains TCU uptime.

GPS Module Power Supply

Automotive Infotainment SoC Core Rail

Use Scenario: Powers GNSS receiver IC (e.g., u-blox UBX-M8030) requiring clean 1.8 V at up to 1.5 A in dashboard-mounted units.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage with fast load-step response to handle RF acquisition bursts.

Use Value: 2.45 MHz max switching frequency avoids AM/FM radio bands; ±1% V_REF ensures consistent GPS lock time across temperature.

Use Scenario: Supplies 1.2 V core rail to application processor (e.g., NXP i.MX8QuadMax) in head-unit mainboard with tight thermal envelope.

IC Role / Device Role / Timing Role: High-current, thermally optimized DC/DC converter with exposed-pad DFN package enabling >1.5 W dissipation on 4-layer PCB.

Use Value: 45 °C/W θ_JA (DFN) and 70 mΩ/55 mΩ MOSFETs reduce junction rise to <40°C at 2 A - avoids thermal throttling during video playback.

Automotive Audio Amplifier Bias

Telematics Control Unit (TCU) I/O Rail

Use Scenario: Generates 3.3 V bias for Class-D audio amplifier (e.g., TI TPA6304) in rear-seat entertainment systems.

IC Role / Device Role / Timing Role: Secondary buck regulator with EN/SYNC synchronized to main SoC clock to minimize beat-frequency noise in analog audio paths.

Use Value: Synchronization range (1.2×–1.5× f_OSC) allows locking to 1.8 MHz system clock - eliminates audible whine in speaker output.

Use Scenario: Provides isolated 2.5 V I/O rail for LTE modem and CAN transceiver in connected vehicle gateways.

IC Role / Device Role / Timing Role: Fault-resilient regulator with hiccup-mode OCP and POK signaling to support fail-safe communication stack restart.

Use Value: Open/short-tolerant pins and 7-event hiccup counter prevent latch-up during CAN bus ESD events - maintains TCU uptime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4420AGL-A-Z	40 V max input, 2 A, no POK output, no EN/SYNC sync function, 125°C max junction	Designed for industrial 24 V systems; lacks automotive fault diagnostics and synchronization needed for infotainment timing alignment	Select only if operating above 5.5 V input or where POK signaling is unnecessary
TPS54202DDCR	6 V max input, 2 A, integrated FETs, 1.5% VREF accuracy, no AEC-Q100 rating, 150°C max junction	Commercial-grade; lacks pin-fault tolerance and thermal shutdown hysteresis required for automotive under-hood proximity	Acceptable for non-safety-critical cabin modules only; not suitable for ASIL-B designs

Compared with MPQ4420AGL-A-Z and TPS54202DDCR, APEK8650KEJ-01-MH uniquely combines AEC-Q100 Grade 1 qualification, POK status signaling, EN/SYNC synchronization, and full pin-fault tolerance - making it the only option qualified for GPS/infotainment core rail applications demanding functional safety and EMI control.

Availability

APEK8650KEJ-01-MH is available at Aetrix Electronics and suitable for automotive infotainment, GPS module power, and telematics control unit (TCU) applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for APEK8650KEJ-01-MH 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 global leader in precision sensing and power ICs, specializing in magnetic sensors, motor drivers, and high-reliability power management solutions for automotive and industrial markets.

The A8650 product line delivers high-efficiency, fault-tolerant synchronous buck regulators engineered specifically for automotive infotainment, ADAS, and body electronics where AEC-Q100 compliance, thermal robustness, and EMI control are mandatory.

FAQ

What is the maximum supported switching frequency for APEK8650KEJ-01-MH?

The APEK8650KEJ-01-MH supports a base switching frequency up to 2.45 MHz (set via FSET resistor), and can be synchronized to an external clock up to 2.9 MHz (1.5× f_OSC). This high-frequency capability enables use of small 1.0 µH inductors and minimizes solution size in space-constrained automotive head-units. Operation beyond 2.45 MHz requires external synchronization and adherence to t_PWSYNC ≥ 200 ns and edge rate specifications.

Does APEK8650KEJ-01-MH support pre-biased startup?

Yes, APEK8650KEJ-01-MH supports pre-biased startup, allowing safe turn-on when the output voltage is already present (e.g., from a backup rail or residual charge). During startup, the low-side MOSFET remains off until the soft-start ramp exceeds the feedback voltage, preventing reverse current flow and potential damage to downstream components. This behavior is confirmed in the Functional Description section of the A8650 datasheet.

What thermal resistance does the APEK8650KEJ-01-MH DFN package achieve on a standard PCB?

The APEK8650KEJ-01-MH (EJ package) achieves θ_JA = 45 °C/W on a 4-layer JEDEC-standard PCB with the exposed thermal pad properly connected to internal ground planes using ≥6 vias. This value assumes 1 in² copper area per layer under the pad. Derating is required above 125°C ambient; full thermal calculations including power dissipation (P_LOSS ≈ I_OUT² × R_DS(on) + switching losses) must be performed for 2 A continuous operation.

How does the Power OK (POK) output of APEK8650KEJ-01-MH behave during undervoltage conditions?

The POK output of APEK8650KEJ-01-MH is an open-drain signal that pulls high only when V_OUT reaches 92–95% of the target regulation voltage (based on 800 mV reference). If V_OUT drops below 89% V_REF, POK transitions low after a 7-PWM-cycle digital delay. This hysteresis (4% of V_REF) prevents chatter during marginal load conditions and provides clean reset signaling to host microcontrollers in automotive systems.

Can APEK8650KEJ-01-MH operate with ceramic output capacitors only?

Yes, APEK8650KEJ-01-MH is explicitly characterized and stabilized for use with ceramic output capacitors only - no electrolytic or tantalum bulk capacitance is required. Its current-mode control architecture and transconductance error amplifier (750 μA/V typ) provide sufficient phase margin with low-ESR ceramics. The datasheet confirms stability with 10 µF X5R 1206 and 0.1 µF X7R 0805 in parallel, meeting automotive ripple and transient requirements.

APEK8650KEJ-01-MH Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Packaging:: Box

Product Status:: Active

Main Purpose:: DC/DC, Step Down

Outputs and Type:: 1 Non-Isolated Output

Voltage - Output:: -

Current - Output:: -

Voltage - Input:: 2A

Regulator Topology:: 2.5V ~ 5.5V

Frequency - Switching:: Buck

Contents:: -

Utilized IC / Part:: Board(s)

Power - Output:: A8650

APEK8650KEJ-01-MH FAQ

1.How can I place an order for APEK8650KEJ-01-MH through Aetrix?

Please submit a Request for Quotation (RFQ) for APEK8650KEJ-01-MH 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 APEK8650KEJ-01-MH reliable?

The price and inventory of APEK8650KEJ-01-MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APEK8650KEJ-01-MH is usually 5 days.

3.What payment methods are accepted for APEK8650KEJ-01-MH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APEK8650KEJ-01-MH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APEK8650KEJ-01-MH?

APEK8650KEJ-01-MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APEK8650KEJ-01-MH 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 APEK8650KEJ-01-MH?

For technical support, including APEK8650KEJ-01-MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APEK8650KEJ-01-MH requirements.

6.How does Aetrix verify that APEK8650KEJ-01-MH is sourced from the original manufacturer or authorized distributors?

All APEK8650KEJ-01-MH 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 APEK8650KEJ-01-MH meets industry standards.

7.What is the process for return or replacement of APEK8650KEJ-01-MH?

All APEK8650KEJ-01-MH units undergo pre-shipment inspection (PSI). If there is an issue with APEK8650KEJ-01-MH, 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 APEK8650KEJ-01-MH part is unused and in its original packaging.

Return procedure for APEK8650KEJ-01-MH:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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