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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Allegro MicroSystems A8650KEJTR-T

Name: A8650KEJTR-T
Brand: Allegro MicroSystems
SKU: A8650KEJTR-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A8650KEJTR-T

Manufacturer:: Allegro MicroSystems

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-WFDFN Exposed Pad

Datasheet:: A8650KEJTR-T.pdf

Description:: IC REG BUCK ADJ 2A 10DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

A8650KEJTR-T from Allegro MicroSystems is an automotive-grade, synchronous buck DC-DC regulator integrating high-side P-channel (70 mΩ) and low-side N-channel (55 mΩ) MOSFETs, supporting 2.5–5.5 V input, 0.8 V adjustable output with ±1% accuracy, and ≥2.0 A continuous load current. It delivers fast transient response via current-mode control and is used in GPS/infotainment power rails requiring compact, thermally robust regulation.

For engineers reviewing the A8650KEJTR-T datasheet, A8650KEJTR-T pinout, A8650KEJTR-T application, or A8650KEJTR-T equivalent, key selection criteria include its AEC-Q100 qualification, 0.25–2.45 MHz adjustable switching frequency, EN/SYNC dual-function interface, Power OK (POK) status flag, and DFN package thermal performance (R_θJA = 45 °C/W).

Technical Context

The A8650KEJTR-T employs current-mode PWM control with external compensation for loop stability across wide output capacitor and inductor variations. Its transconductance error amplifier (750 μA/V typ) regulates against FB voltage with soft-start prioritization and internal 800 mV reference offset.

Switching is governed by a programmable oscillator (set via FSET resistor), with synchronization capability (1.2× to 1.5× f_OSC) and non-overlap timing (15 ns) preventing shoot-through. Protection includes cycle-by-cycle OCP (4.1 A at 5% duty), hiccup-mode short-circuit response, UVLO (2.25 V stop threshold), OVP, and thermal shutdown (170 °C trip).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5 V to 5.5 V - supports single-cell Li-ion, USB PD, and automotive 3.3 V/5 V rails without pre-regulation.
Output Voltage Accuracy	±1% from –40°C to 125°C - enables precise core voltage regulation for DSPs and SoCs in harsh environments.
Max Output Current	≥2.0 A continuous - sustains full load under worst-case thermal conditions on 4-layer PCB with exposed pad.
Switching Frequency	0.25–2.45 MHz adjustable - allows EMI optimization and small external magnetics (e.g., 1.0 µH inductor at 2 MHz).
High-Side R_DS(on)	70 mΩ (25°C) - limits conduction loss to <140 mW at 2 A, critical for efficiency in low-V_IN applications.
Sleep Mode Current	<3 μA - enables ultra-low standby power in always-on automotive modules without external enable sequencing.
Thermal Resistance	R_θJA = 45 °C/W (DFN-EJ) - requires ≥6 vias to GND plane under exposed pad for reliable 125°C ambient operation.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Switch node	Drain connection of both internal MOSFETs; must be routed with minimal loop area to LO and CO for EMI control.
2 PGND	Power ground	Low-impedance return path for high di/dt currents; separate from signal GND to avoid noise coupling.
3 EN/SYNC	Enable & sync input	Logic-controlled startup/shutdown (V_H = 1.8 V max) and external clock synchronization (1.2–1.5× f_OSC).
4 POK	Power OK open-drain	Signals V_OUT regulation status (92–95% V_REF) with 7-cycle digital delay; requires external pull-up.
5 FSET	Frequency setting	Resistor-to-GND sets base f_OSC; 10.7 kΩ yields ~2 MHz per datasheet Figure 10.
6 COMP	Error amp output	Compensation node for current-mode loop; connects R_Z/C_Z/C_P network to stabilize transient response.
7 FB	Feedback input	Monitors output divider ratio; regulates to 800 mV reference with ±1% tolerance over temperature.
8 SS	Soft start	Capacitor-to-GND sets ramp time (880 μs typical) and hiccup period; supports pre-biased startup.
9 GND	Signal ground	Reference for analog circuitry; tied to PGND at single point near VIN decoupling.
10 VIN	Input supply	Supplies control circuitry and high-side MOSFET source; requires local 3.3 µF ceramic decoupling.
PAD	Exposed thermal pad	Mandatory connection to PCB ground plane via ≥6 thermal vias for thermal dissipation and EMI reduction.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualified	Validated for automotive ambient range (–40°C to 125°C) with full reliability testing per stress requirements.
Externally adjustable soft start	Capacitor on SS pin sets controlled output ramp rate and hiccup timeout-eliminates inrush-induced rail collapse.
Pre-biased startup support	Allows safe turn-on into pre-charged output capacitors without reverse current or latch-up risk.
Stable with ceramic output caps	No ESR requirement simplifies BOM and improves transient response vs. electrolytic alternatives.
Pin-fault tolerant protection	Open, adjacent-pin short, and short-to-ground detection on all pins meets ASIL-B functional safety readiness.

Applications

GPS/Infotainment	Automobile Audio
Use Scenario: Powering RF front-end ICs and display controllers in vehicle head units with tight EMI limits. IC Role / Device Role / Timing Role: Primary 1.8 V/2.0 A buck regulator delivering clean, low-noise supply with synchronized switching to avoid band interference. Use Value: 2.45 MHz max frequency places switching harmonics above AM/FM bands; POK confirms stable rail before system boot.	Use Scenario: Supplying Class-D amplifier ICs and DSPs in premium car audio systems operating continuously at elevated cabin temperatures. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC converter enabling compact heatsink-free designs in space-constrained enclosures. Use Value: 45 °C/W R_θJA and 125°C ambient rating ensure >2 A delivery without derating; AEC-Q100 ensures lifetime reliability.
Home Audio	Network and Telecom
Use Scenario: Regulating 1.2 V core voltage for high-performance audio SoCs in smart speakers and streaming receivers. IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator enabling layout-driven EMI tuning while maintaining ±1% output accuracy across line/load/temperature. Use Value: External compensation allows optimization for low-ESR ceramic caps and small inductors-reducing solution size by >30% vs. fixed-frequency alternatives.	Use Scenario: Providing isolated 3.3 V bias for PoE-powered Ethernet PHYs and small-cell baseband processors. IC Role / Device Role / Timing Role: Input-capable buck regulator accepting wide-range 5 V inputs (e.g., from LDOs or secondary windings) with robust UVLO and OVP. Use Value: 2.25 V UVLO stop threshold prevents brownout operation during input sag; hiccup-mode protection avoids thermal runaway during cable fault events.

GPS/Infotainment

Automobile Audio

Use Scenario: Powering RF front-end ICs and display controllers in vehicle head units with tight EMI limits.

IC Role / Device Role / Timing Role: Primary 1.8 V/2.0 A buck regulator delivering clean, low-noise supply with synchronized switching to avoid band interference.

Use Value: 2.45 MHz max frequency places switching harmonics above AM/FM bands; POK confirms stable rail before system boot.

Use Scenario: Supplying Class-D amplifier ICs and DSPs in premium car audio systems operating continuously at elevated cabin temperatures.

IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC converter enabling compact heatsink-free designs in space-constrained enclosures.

Use Value: 45 °C/W R_θJA and 125°C ambient rating ensure >2 A delivery without derating; AEC-Q100 ensures lifetime reliability.

Home Audio

Network and Telecom

Use Scenario: Regulating 1.2 V core voltage for high-performance audio SoCs in smart speakers and streaming receivers.

IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator enabling layout-driven EMI tuning while maintaining ±1% output accuracy across line/load/temperature.

Use Value: External compensation allows optimization for low-ESR ceramic caps and small inductors-reducing solution size by >30% vs. fixed-frequency alternatives.

Use Scenario: Providing isolated 3.3 V bias for PoE-powered Ethernet PHYs and small-cell baseband processors.

IC Role / Device Role / Timing Role: Input-capable buck regulator accepting wide-range 5 V inputs (e.g., from LDOs or secondary windings) with robust UVLO and OVP.

Use Value: 2.25 V UVLO stop threshold prevents brownout operation during input sag; hiccup-mode protection avoids thermal runaway during cable fault events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2315GJ-Z	Fixed 500 kHz–2.2 MHz frequency; no SYNC input; 3.5 A rated; R_DS(on) = 65/35 mΩ; no AEC-Q100 certification.	Targeted at industrial/commercial power supplies-not qualified for automotive use.	Select when AEC-Q100 is not required and higher peak current margin is needed.
TPS54202DRCT	Fixed 400 kHz–2.5 MHz; integrated 120 mΩ/70 mΩ MOSFETs; 2 A rated; no POK output; no hiccup mode.	Designed for cost-sensitive consumer electronics; lacks automotive fault diagnostics and rail monitoring.	Select when POK signaling and hiccup-mode short-circuit protection are not mandatory.

Compared with MP2315GJ-Z and TPS54202DRCT, the A8650KEJTR-T uniquely combines AEC-Q100 qualification, EN/SYNC dual functionality, Power OK status flag, and comprehensive pin-fault tolerance-making it the only option validated for safety-critical automotive subsystems requiring diagnostic coverage and thermal resilience.

Availability

A8650KEJTR-T is available at Aetrix Electronics and suitable for GPS/infotainment, automobile audio, and network/telecom applications requiring stable component supply, automotive-grade reliability, and long-term production continuity.

Supply support for A8650KEJTR-T 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 semiconductor company specializing in high-performance power ICs, magnetic sensors, and motor driver solutions for automotive and industrial markets.

The A8650 product line delivers high-current, low-voltage synchronous buck regulators optimized for automotive infotainment, ADAS, and body electronics where AEC-Q100 compliance, thermal robustness, and integrated protection are mandatory.

FAQ

What is the maximum switching frequency supported by the A8650KEJTR-T?

The A8650KEJTR-T supports a base switching frequency adjustable from 0.25 MHz to 2.45 MHz via the FSET resistor. When synchronized to an external clock, the actual PWM frequency can reach up to 2.9 MHz (1.5× f_OSC typ). This range enables EMI optimization and compatibility with small inductors like 1.0 µH in high-density layouts.

Does the A8650KEJTR-T support pre-biased startup?

Yes, the A8650KEJTR-T supports pre-biased startup. Its control architecture allows safe turn-on into an already charged output capacitor without reverse current flow or instability. This is confirmed in the Functional Description section and validated across –40°C to 125°C, making it suitable for hot-swap and multi-rail sequencing applications.

What thermal performance can be expected from the A8650KEJTR-T in its DFN package?

The A8650KEJTR-T in the 10-pin DFN (EJ) package has a junction-to-ambient thermal resistance (R_θJA) of 45 °C/W on a 4-layer JEDEC-standard PCB. Achieving this requires connecting the exposed thermal pad to the PCB ground plane using at least six vias-ensuring reliable 2 A operation at 125°C ambient without derating.

How does the Power OK (POK) output function on the A8650KEJTR-T?

The POK output on the A8650KEJTR-T is an open-drain signal that transitions high-impedance when V_OUT reaches 92–95% of the feedback reference voltage (V_REF). It includes a 7-PWM-cycle digital delay and hysteresis (4%) to prevent chatter during regulation entry/exit, providing a clean system-ready flag for microcontrollers and PMICs.

Is the A8650KEJTR-T pin-compatible with other variants in the A8650 family?

No, the A8650KEJTR-T is not pin-compatible with the discontinued A8650KLYTR-T (MSOP package), despite sharing identical pin functions. The DFN (EJ) and MSOP (LY) packages have different pinouts and mechanical footprints-PCB redesign is required for substitution. Always verify land pattern and thermal via placement per package drawing.

A8650KEJTR-T Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 10-WFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.5V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: -

Current - Output:: 2A

Frequency - Switching:: 250kHz ~ 2.45MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 10-DFN (3x3)

A8650KEJTR-T FAQ

1.How can I place an order for A8650KEJTR-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A8650KEJTR-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 A8650KEJTR-T reliable?

The price and inventory of A8650KEJTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8650KEJTR-T is usually 5 days.

3.What payment methods are accepted for A8650KEJTR-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8650KEJTR-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A8650KEJTR-T?

A8650KEJTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A8650KEJTR-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 A8650KEJTR-T?

For technical support, including A8650KEJTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8650KEJTR-T requirements.

6.How does Aetrix verify that A8650KEJTR-T is sourced from the original manufacturer or authorized distributors?

All A8650KEJTR-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 A8650KEJTR-T meets industry standards.

7.What is the process for return or replacement of A8650KEJTR-T?

All A8650KEJTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8650KEJTR-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 A8650KEJTR-T part is unused and in its original packaging.

Return procedure for A8650KEJTR-T:

1.Submit a request within 90 days.

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

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