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Allegro MicroSystems A8650KLYTR-T
- Part No.:
- A8650KLYTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
A8650KLYTR-T.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,698
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Product details
Overview
A8650KLYTR-T from Allegro MicroSystems is an automotive-grade, adjustable-frequency synchronous buck regulator integrating 70 mΩ high-side P-channel and 55 mΩ low-side N-channel MOSFETs. It delivers ≥2.0 A output current with input range 2.5–5.5 V, output as low as 0.8 V (±1% accuracy), and switching frequency adjustable from 250 kHz to 2.45 MHz. It is used in GPS/infotainment power rails requiring tight regulation, fast transient response, and AEC-Q100 compliance.
For engineers reviewing the A8650KLYTR-T datasheet, A8650KLYTR-T pinout, A8650KLYTR-T application, or A8650KLYTR-T equivalent, key selection considerations include its EN/SYNC-controlled enable/synchronization, Power OK (POK) output for system sequencing, external soft-start timing via CSS, current-mode control architecture, and thermal shutdown with 170°C trip point.
Technical Context
The A8650KLYTR-T employs current-mode PWM control with transconductance error amplifier (gm = 750 µA/V typ), internal slope compensation scaled to fOSC, and a 125 ns minimum on-time for stable operation at high duty cycles. Its dual-MOSFET power stage supports continuous conduction mode (CCM) down to zero load, minimizing EMI in noise-sensitive audio and infotainment systems.
It features integrated protection including cycle-by-cycle OCP (4.1 A at 5% duty), hiccup-mode short-circuit response (7 OCP events), UVLO (2.22 V start), overvoltage lockout (115% VREF), and thermal shutdown (170°C). The COMP pin supports full external loop compensation with RZ/CZ/CP network for optimization across ceramic capacitor-based designs.
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 Current Capability | ≥2.0 A DC - sufficient for powering DSPs, RF front-ends, or multi-core SoCs in infotainment head units. |
| Switching Frequency Range | 250 kHz to 2.45 MHz - enables compact magnetics and EMI filtering while avoiding AM band interference. |
| Reference Voltage Accuracy | ±1% from –40°C to 125°C - ensures stable 0.8 V core voltage for processors under full thermal stress. |
| Quiescent Current (Sleep) | <3 µA - maintains ultra-low standby power in always-on vehicle modules like telematics gateways. |
| Thermal Shutdown Threshold | 170°C (typ) - provides robust protection during sustained overload or poor PCB heatsinking. |
| Package Thermal Resistance | 48 °C/W (RθJA, MSOP-LY) - requires minimal copper area for thermal management in space-constrained layouts. |
Pinout & Package
Package: 10-pin MSOP with exposed thermal pad (suffix LY), lead-free, 100% matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | Drain connection of both internal MOSFETs; must be routed with wide, low-inductance traces to LO and CO. |
| 2 PGND | Power ground | High-current return path for MOSFETs; separate from signal GND to minimize noise coupling into FB/COMP. |
| 3 EN/SYNC | Enable & sync input | Logic-level enable (VH = 1.8 V max); also accepts external clock (1.2×–1.5× fOSC) for EMI reduction. |
| 4 POK | Power OK open-drain output | Signals VOUT regulation status (92%–95% VREF threshold); pulls high only after soft-start completion and fault clearance. |
| 5 FSET | Frequency setting | Resistor-to-GND sets base fOSC; 10.7 kΩ yields ~2 MHz - critical for optimizing efficiency vs. size trade-off. |
| 6 COMP | Error amplifier output | Compensation node requiring external RZ/CZ/CP network; internal 1.5 kΩ pull-down activates during fault or disable. |
| 7 FB | Feedback input | Senses output divider ratio; bias current ≤300 nA allows high-value resistors to minimize divider loading. |
| 8 SS | Soft-start control | Capacitor-to-GND sets ramp time (880 µs w/22 nF); also determines hiccup period during overcurrent faults. |
| 9 GND | Signal ground | Low-noise reference for analog circuitry; must be star-connected to PGND near exposed pad vias. |
| 10 VIN | Input supply | Powers control circuitry and high-side MOSFET source; requires local 3.3 µF ceramic decoupling per datasheet layout guidelines. |
| PAD | Exposed thermal pad | Must connect to PCB ground plane via ≥6 thermal vias; primary path for heat dissipation in high-power operation. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 qualified | Rated for –40°C to 125°C ambient; validated for vibration, ESD, and latch-up immunity in vehicle environments. |
| Pre-biased startup capability | Allows safe turn-on when output capacitor is pre-charged - essential for hot-swap or rail-sequencing applications. |
| Stable with ceramic output capacitors | Eliminates need for electrolytic or tantalum caps; reduces board area, improves reliability, and lowers ESR-related losses. |
| Pin-to-ground short-circuit tolerance | All pins withstand direct short to GND without damage - meets stringent ISO 16750-2 electrical abuse requirements. |
| Externally adjustable compensation | Enables loop tuning for diverse inductor/capacitor combinations, ensuring stability across production tolerances and temperature. |
Applications
| GPS/Infotainment Power Rail | Automobile Audio DSP Supply |
|---|---|
|
Use Scenario: Powers navigation processor and display controller in automotive head units with strict EMI limits and cold-crank survival. IC Role / Device Role / Timing Role: Primary 1.8 V/2.0 A buck regulator delivering regulated core voltage with POK sequencing and EN-controlled wake-up. Use Value: ±1% VREF accuracy maintains CPU timing margins across –40°C to 125°C; 2.45 MHz fOSC avoids AM radio band interference. |
Use Scenario: Supplies 1.2 V core voltage to multi-core audio DSP in premium car sound systems with low-noise requirements. IC Role / Device Role / Timing Role: Synchronous buck converter with CCM operation and <105 ns min on-time to sustain regulation at light loads. Use Value: Low-side MOSFET's 55 mΩ RDS(on) minimizes dropout and thermal rise during burst-mode audio processing. |
| Home Audio Digital Amplifier | Network/Telecom PoE Interface |
|
Use Scenario: Provides clean 3.3 V rail for Class-D amplifier controllers in smart speakers and home theater receivers. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with soft-start and hiccup-mode protection against speaker short circuits. Use Value: External soft-start capacitor (CSS) prevents inrush into large output capacitance; POK confirms rail readiness before enabling amplifiers. |
Use Scenario: Generates isolated 5 V auxiliary supply from PoE midspan in telecom gateways and industrial routers. IC Role / Device Role / Timing Role: Input-stage buck converter accepting wide-range PoE-derived input (2.5–5.5 V) with UVLO hysteresis for brownout immunity. Use Value: 2.22 V UVLO start threshold ensures reliable operation during PoE power negotiation and cable voltage drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A81805KESJSR | Successor device with enhanced efficiency, lower IQ (1.5 µA sleep), and improved thermal resistance (42 °C/W DFN). | Same AEC-Q100 qualification and pin-compatible footprint; supports higher output current (3 A) and wider fSW range (100 kHz–4 MHz). | Select for new designs requiring extended lifecycle support and higher performance; not drop-in due to different package (ESJSR = 12-pin DFN). |
| MP2451DT-LF-Z | Non-AEC-Q100, 2 A buck with fixed 2 MHz fSW, no POK or SYNC, higher RDS(on) (110/85 mΩ), no pre-bias startup. | Limited to industrial/commercial use; lacks automotive safety features (no hiccup mode, no pin-short tolerance). | Consider only for cost-sensitive non-automotive applications where AEC-Q100 and advanced protection are not required. |
Compared with A8650KLYTR-T, A81805KESJSR offers higher current capability and better thermal performance in a newer package, while MP2451DT-LF-Z trades automotive robustness for lower BOM cost in non-safety-critical systems.
Availability
A8650KLYTR-T is available at Aetrix Electronics and suitable for GPS/infotainment, automobile audio, and network/telecom power conversion requiring stable component supply despite end-of-life status.
Supply support for A8650KLYTR-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 was designed specifically for demanding automotive power conversion applications requiring AEC-Q100 compliance, high integration, and robust fault protection in compact form factors.
FAQ
Is A8650KLYTR-T still recommended for new designs?
No. Per Allegro's official notice dated September 30, 2024, A8650KLYTR-T is no longer in production and should not be purchased for new design applications. Samples are unavailable. A81805KESJSR is the designated replacement with enhanced specifications and active lifecycle support.
What is the function of the POK pin on A8650KLYTR-T?
The POK (Power OK) pin on A8650KLYTR-T is an open-drain output that transitions high-impedance only when VOUT reaches 92–95% of the target voltage (VREF) and remains stable. It provides system-level sequencing feedback and requires an external pull-up resistor to confirm regulation status before enabling downstream logic.
Can A8650KLYTR-T operate with a pre-biased output capacitor?
Yes. A8650KLYTR-T supports pre-biased startup, allowing safe turn-on when the output capacitor is already charged. This feature prevents reverse current flow and potential damage during hot-swap or multi-rail sequencing scenarios common in automotive infotainment systems.
What package type does A8650KLYTR-T use, and how is thermal management handled?
A8650KLYTR-T uses a 10-pin MSOP package with exposed thermal pad (suffix LY). Thermal management relies on soldering the exposed pad to the PCB ground plane using at least six thermal vias. Its RθJA is 48 °C/W on a JEDEC-standard 4-layer board, requiring careful copper pour design for >1.5 A continuous operation.
Does A8650KLYTR-T support external clock synchronization?
Yes. The EN/SYNC pin on A8650KLYTR-T accepts an external clock signal to synchronize switching frequency from 1.2× to 1.5× the base fOSC set by RFSET. The input must meet specified pulse width (≥200 ns), duty cycle (<80%), and edge rate (≤15 ns) requirements to ensure reliable locking without jitter or phase slip.
A8650KLYTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 250kHz ~ 2.45MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
A8650KLYTR-T FAQ
1.How can I place an order for A8650KLYTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8650KLYTR-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 A8650KLYTR-T reliable?
The price and inventory of A8650KLYTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8650KLYTR-T is usually 5 days.
3.What payment methods are accepted for A8650KLYTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8650KLYTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8650KLYTR-T?
A8650KLYTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8650KLYTR-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 A8650KLYTR-T?
For technical support, including A8650KLYTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8650KLYTR-T requirements.
6.How does Aetrix verify that A8650KLYTR-T is sourced from the original manufacturer or authorized distributors?
All A8650KLYTR-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 A8650KLYTR-T meets industry standards.
7.What is the process for return or replacement of A8650KLYTR-T?
All A8650KLYTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8650KLYTR-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 A8650KLYTR-T part is unused and in its original packaging.
Return procedure for A8650KLYTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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