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Allegro MicroSystems A8653KLPTR-T
- Part No.:
- A8653KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A8653KLPTR-T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
A8653KLPTR-T from Allegro MicroSystems is a wide-input synchronous buck regulator with integrated high-side (80 mΩ) and low-side (55 mΩ) MOSFETs, delivering up to 2.6 A continuous output current at 5 V. It features remote load regulation via programmable cable-drop compensation (±2% accuracy at 500 mV correction), dynamic overvoltage protection with load-dependent threshold, and automotive-grade AEC-Q100 qualification. It targets USB power delivery in automotive rear-seat entertainment and navigation systems.
For engineers reviewing the A8653KLPTR-T datasheet, A8653KLPTR-T pinout, A8653KLPTR-T application, or A8653KLPTR-T equivalent, key selection criteria include its 4–36 V input range, 100 kHz–2.2 MHz adjustable switching frequency, remote-sense-enabled ±2% load regulation accuracy, and integrated hiccup-mode OCP/thermal shutdown-critical for robust USB port designs under varying wiring harness conditions.
Technical Context
The A8653KLPTR-T implements peak current-mode control with transconductance error amplifier (750 µA/V typ), enabling fast transient response and stable operation with ceramic output capacitors. Its remote load regulation architecture uses differential current sensing (ISEN+/ISEN−) and user-programmable gain via GADJ/IADJ pins to dynamically adjust the feedback reference voltage based on measured load current and known wiring resistance.
Protection logic integrates pulse-by-pulse current limiting (4 A typ at tON(MIN)), dynamic OVP with correction-voltage tracking, 115% regulated voltage clamp, and open-circuit/short-to-ground tolerance on all pins. The device sustains operation down to 2.6 V VIN (UVLO stop) and supports pre-bias startup and frequency dithering for EMI reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.6 A continuous - sufficient for USB 3.0 charging compliance without external boost stages. |
| Input Voltage Range | 4 V to 36 V - supports 12 V automotive battery systems including cold-crank (down to 2.6 V UVLO stop). |
| Switching Frequency | 100 kHz to 2.2 MHz - adjustable via RFSET resistor or external SYNC clock; enables layout-optimized EMI control. |
| Remote Load Regulation Accuracy | ±2% at 500 mV correction - achieves tight end-point voltage regulation across variable wiring harness IR drops. |
| Thermal Resistance | RθJA = 34 °C/W - validated on 4-layer JEDEC PCB; enables 2.6 A operation without forced airflow in LP package. |
| Feedback Reference Voltage | 800 mV ±1% (–40°C to 125°C) - sets base output voltage; programmable from 3.3 V to 5.75 V via FB divider. |
| Protection Features | Dynamic OVP, hiccup-mode short-circuit, thermal shutdown (170°C trip), and pin-level short-to-ground tolerance - meets ASIL-B readiness for infotainment power rails. |
Pinout & Package
Package: 16-pin eTSSOP (suffix LP), 4.4 mm × 5 mm, 1.2 mm nominal height, with exposed thermal pad (PAD) requiring ≥6 vias to PGND plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input | Active-high logic control; connects directly to VIN or microcontroller GPIO; 1.41 V typical rising threshold. |
| VIN (Pin 2) | Main power input | Supplies control circuitry and high-side MOSFET drain; requires local 2×4.7 µF ceramic decoupling. |
| SS (Pin 3) | Soft-start timing node | Capacitor-to-GND sets soft-start ramp time and hiccup period; sinks 2.2 µA during fault recovery. |
| GADJ (Pin 4) | Gain adjustment for remote regulation | Resistor-to-GND sets correction gain; grounding disables remote load regulation entirely. |
| FB (Pin 5) | Negative feedback input | Connects to resistor divider from VOUT; internal 800 mV reference defines output voltage setpoint. |
| IADJ (Pin 6) | Load-side current limit programming | Resistor-to-GND sets foldback current limit (3 A typ for A8653); also inversely scales voltage correction gain. |
| SGND (Pin 7) | Signal ground reference | Separate quiet ground for analog circuitry; must be star-connected to avoid noise coupling into FB/ISEN paths. |
| COMP (Pin 8) | Error amplifier output & compensation node | Connects external RC network for loop stability; transconductance 750 µA/V ensures robust phase margin. |
| SYNC/FSET (Pin 9) | Frequency setting/synchronization input | Resistor-to-GND sets fSW; accepts external clock 100 kHz–2.2 MHz with 10 ns rise/fall time compliance. |
| POK (Pin 10) | Power OK open-drain output | Asserts high-impedance when VOUT within ±3% and no current-limit condition; 7 PWM-cycle delay. |
| ISEN− (Pin 11) | Negative current sense input | Connects to load side of RSEN (20 mΩ typical); differential input with ±0.3 V max common-mode range. |
| ISEN+ (Pin 12) | Positive current sense input | Connects to inductor side of RSEN; OV threshold 5.65 V ensures robustness against load transients. |
| PGND (Pins 13,14) | Power ground return | High-current return path for MOSFETs and inductor; must be low-inductance copper pour tied to PAD. |
| SW (Pin 15) | Switch node | Drives external inductor; requires minimal trace length and wide copper; internal clamp diodes to VIN/GND. |
| BOOT (Pin 16) | High-side gate drive bootstrap | 100 nF ceramic capacitor to SW provides floating bias for high-side MOSFET; 5.5 V max rating. |
| PAD | Exposed thermal pad | Must be soldered to solid GND plane with ≥6 thermal vias; primary path for heat dissipation (RθJA = 34 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Remote Load Regulation | Programmable ±500 mV correction with ±2% accuracy - eliminates need for remote sense lines in USB power delivery. |
| Integrated Power Stage | 80 mΩ HS + 55 mΩ LS MOSFETs - enables >90% efficiency at 2.6 A/5 V without external switches or drivers. |
| Dynamic Overvoltage Protection | OVP threshold tracks correction voltage - prevents overvoltage at load during sudden current drop or wire disconnect. |
| Automotive-Grade Robustness | AEC-Q100 Grade 1 (–40°C to 125°C), 40 V surge tolerance, and pin-level short-to-ground protection - certified for under-hood and cabin applications. |
| Flexible Frequency Control | 100 kHz–2.2 MHz adjustable fSW with dithering - allows EMI optimization across diverse board layouts and noise-sensitive environments. |
| Pre-bias Startup Support | Operates with pre-charged output - avoids reverse current or output collapse when powering up systems with existing bus capacitance. |
Applications
| Automotive USB Power Ports | Rear Seat Entertainment |
|---|---|
Use Scenario: Dual-port 5 V/2.6 A USB charging in center console or armrest, subject to long wiring harnesses (up to 125 mΩ round-trip resistance). IC Role / Device Role / Timing Role: Primary synchronous buck regulator with remote load regulation to maintain ±2% VLOAD accuracy despite harness voltage drop. Use Value: Eliminates need for remote sense traces or secondary LDOs, reducing BOM count and PCB area while meeting USB BC1.2 spec. |
Use Scenario: Powering 10.1″ LCD displays and media processors in rear-seat tablets, where input voltage varies from 9 V (idle) to 16 V (load dump). IC Role / Device Role / Timing Role: Wide-input buck converter with hiccup-mode OCP and thermal shutdown to sustain operation during transient overloads. Use Value: Delivers stable 5 V at 2.6 A with <100 µs transient response to 1 A load steps, preventing display flicker or processor brownouts. |
| Navigation Systems | Motorcycle Clusters |
Use Scenario: GPS + cellular modem + touchscreen interface powered from vehicle battery with cold-crank events down to 2.6 V. IC Role / Device Role / Timing Role: Input-robust buck regulator with UVLO stop at 2.6 V and pre-bias startup to maintain system uptime during engine cranking. Use Value: Prevents navigation unit reset during start-stop cycles; maintains POK assertion only when VOUT is fully regulated and safe. |
Use Scenario: Compact instrument cluster with LED backlighting and CAN interface, mounted in vibration-prone handlebar environment. IC Role / Device Role / Timing Role: AEC-Q100 qualified buck regulator with short-to-ground tolerant pins and exposed thermal pad for convection cooling. Use Value: Survives mechanical shock and thermal cycling; 34 °C/W RθJA enables full 2.6 A output without heatsink in space-constrained enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4332GQ-AEC1 | 2.5 A output, 3.3–36 V input, no remote load regulation; requires external current sense for cable compensation. | Lacks integrated remote regulation - needs additional op-amp circuitry and layout complexity to match A8653KLPTR-T's ±2% load accuracy. | Select when cost sensitivity outweighs wiring-harness compensation needs and external components are acceptable. |
| TPS54560QDGQRQ1 | 5.5 A output, 3.5–60 V input, adjustable current limit but no dynamic OVP or programmable correction gain. | Higher current capability but no built-in remote regulation algorithm - cannot achieve same end-point voltage accuracy without custom firmware control. | Select for higher-power infotainment subsystems where headroom matters more than harness-aware regulation. |
Compared with MPQ4332GQ-AEC1 and TPS54560QDGQRQ1, the A8653KLPTR-T uniquely integrates remote load regulation with programmable gain and dynamic OVP, enabling single-chip USB power delivery with ±2% load accuracy across variable wiring resistances-reducing design risk and validation effort in automotive USB ports.
Availability
A8653KLPTR-T is available at Aetrix Electronics and suitable for automotive USB power ports, rear seat entertainment systems, and navigation systems requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for A8653KLPTR-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 and magnetic sensors for automotive and industrial applications.
The A8653KLPTR-T belongs to Allegro's automotive-qualified synchronous buck regulator product line, designed specifically for robust USB power delivery in vehicles with long wiring harnesses and harsh electrical environments.
FAQ
What is the maximum continuous output current of the A8653KLPTR-T?
The A8653KLPTR-T delivers 2.6 A continuous output current at 5 V under typical thermal conditions (RθJA = 34 °C/W, 4-layer PCB). This rating assumes proper thermal design with the exposed pad soldered to a solid ground plane using ≥6 vias. Derating applies above 85°C ambient or with reduced copper area.
How does remote load regulation work in the A8653KLPTR-T?
The A8653KLPTR-T implements remote load regulation by measuring load current via ISEN+/ISEN− pins and adjusting the FB reference voltage using a user-programmable gain set by resistors on GADJ and IADJ pins. This compensates for wiring harness IR drop, achieving ±2% accuracy at the load point without physical remote sense traces.
Can the A8653KLPTR-T operate during automotive cold-crank conditions?
Yes. The A8653KLPTR-T remains operational down to 2.6 V input (UVLO stop threshold), supporting engine cranking scenarios where battery voltage dips below 6 V. Its wide 4–36 V input range and pre-bias startup capability ensure uninterrupted power to connected USB devices during cold-crank events.
What protection features does the A8653KLPTR-T include?
The A8653KLPTR-T integrates pulse-by-pulse current limiting, hiccup-mode short-circuit protection, dynamic overvoltage protection with load-dependent threshold, thermal shutdown (170°C trip), and pin-level open-circuit/short-to-ground tolerance on all I/O pins-meeting stringent automotive reliability requirements.
Is the A8653KLPTR-T pin-compatible with the A8652KLPTR-T?
Yes. The A8653KLPTR-T and A8652KLPTR-T share identical 16-pin eTSSOP (LP) packaging, pinout, and functional interface. They differ only in current capability (2.6 A vs. 1 A) and internal MOSFET RDS(on) (55/80 mΩ vs. 120/160 mΩ), allowing drop-in replacement where higher output current is required.
A8653KLPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 5.75V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 100kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A8653KLPTR-T FAQ
1.How can I place an order for A8653KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8653KLPTR-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 A8653KLPTR-T reliable?
The price and inventory of A8653KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8653KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8653KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8653KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8653KLPTR-T?
A8653KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8653KLPTR-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 A8653KLPTR-T?
For technical support, including A8653KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8653KLPTR-T requirements.
6.How does Aetrix verify that A8653KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8653KLPTR-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 A8653KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8653KLPTR-T?
All A8653KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8653KLPTR-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 A8653KLPTR-T part is unused and in its original packaging.
Return procedure for A8653KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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