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Allegro MicroSystems A8583KLPTR-T
- Part No.:
- A8583KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A8583KLPTR-T.pdf
- Description:
- IC REG BUCK ADJ 3.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:14,819
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Product details
Overview
A8583KLPTR-T from Allegro MicroSystems is an automotive-grade, asynchronous buck regulator IC integrating a 70 mΩ high-side N-channel MOSFET, supporting 4.7–36 V input and adjustable 0.8 V output with ≥3.5 A continuous load current. It features externally adjustable 0.25–2.4 MHz switching frequency, soft-start via CSS capacitor, EN/SYNC logic control & synchronization, and Power OK (POK) status indication - deployed in infotainment power rails and audio subsystems.
For engineers reviewing the A8583KLPTR-T datasheet, A8583KLPTR-T pinout, A8583KLPTR-T application, or A8583KLPTR-T equivalent, key selection criteria include its AEC-Q100 qualification, 3.5 mA no-load quiescent current at 2 MHz, hiccup-mode short-circuit protection, UVLO stop threshold of 3.8 V (typ), and TSSOP-16EP package thermal resistance of 34 °C/W on 4-layer PCB.
Technical Context
The A8583KLPTR-T implements current-mode PWM control with internal slope compensation scaled to switching frequency, enabling stable operation up to 90% duty cycle across wide VIN/VOUT ratios. Its transconductance error amplifier (gm = 550–1000 µA/V) interfaces with external RC compensation (RZ/CZ) for loop tuning, while the COMP pin pulls down via ~1.5 kΩ during fault conditions to inhibit switching.
It integrates dual-MOSFET gate drive: a 70 mΩ high-side switch and a dedicated 10 Ω low-side MOSFET used *only* for boot capacitor charging - not as synchronous rectifier - minimizing light-load shoot-through and improving efficiency. Protection includes pulse-by-pulse OCP (5.65 A typ), OVP (114% × VREF), TSD (165 °C trip), and unique missing-diode detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.7 V to 36 V - supports automotive battery transients including 40 V surge testing without derating |
| Output Current | ≥3.5 A continuous - sustained at full load with proper thermal layout on 4-layer PCB |
| Switching Frequency | 0.25–2.4 MHz adjustable via RFSET resistor - enables EMI optimization and compact magnetics selection |
| Feedback Reference | 0.800 V ±1% - sets minimum output voltage; accuracy maintained over –40°C to +125°C ambient |
| Quiescent Current | 3.5 mA typical at no load, 2 MHz - enables low-power standby modes in always-on systems |
| Sleep Mode Current | <3 µA - achieved when EN/SYNC ≤ 0.4 V; total VIN current includes MOSFET leakage (~10 µA) |
| Thermal Resistance | RθJA = 34 °C/W - measured on JEDEC-standard 4-layer board; requires exposed pad soldered to ≥6 vias to GND |
| Protection Features | OCP, HIC, OVP, TSD, UVLO, missing-diode detection, open/short-to-ground tolerance - satisfies ASIL-B system-level safety requirements |
Pinout & Package
Package: 16-pin TSSOP with exposed thermal pad (suffix LP). Requires soldering of PAD to PCB ground plane using ≥6 thermal vias for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, VIN | Power input & high-side MOSFET drain | Connect to 4.7–36 V supply with local 3.3 µF ceramic capacitor; shared pin group reduces trace inductance |
| 4, SS | Soft-start timing & hiccup period control | Capacitor (CSS = 22 nF) sets ramp time (880 µs) and hiccup interval; also resets fault latch at 235 mV |
| 5, 12, GND | Analog/digital ground reference | Low-impedance return path for control circuitry; must be tied to power ground near VIN decoupling |
| 6, POK | Open-drain Power OK status output | Asserts high-impedance when VOUT reaches 90% of target (±3% hysteresis); drives external enable or monitoring logic |
| 7, EN/SYNC | Enable control & external clock sync input | Logic high (>1.65 V) enables regulation; accepts 1.2× to 1.5× fSW sync clock with 200 ns min pulse width |
| 8, FSET | Switching frequency programming node | Resistor to GND (e.g., 11.5 kΩ → ~2 MHz) sets base fSW; ±12% temp stability over –40°C to +125°C |
| 9, FB | Negative feedback input for output regulation | Senses divider ratio (e.g., RFB1=16.5 kΩ, RFB2=5.23 kΩ → 3.3 V); bias current ≤300 nA minimizes divider error |
| 10, FBX | Remote sense input for OVP comparator | Configures overvoltage trip point (114% × VREF); tie to GND if OVP not required |
| 11, COMP | Error amplifier output & compensation node | Connect RZ (18.2 kΩ) and CZ (1.2 nF) to GND for stability; CP (4.7 pF) optional for HF noise filtering |
| 13, NC | No connect | Not internally bonded; leave unconnected and unpopulated on PCB |
| 14, BOOT | High-side gate drive bootstrap supply | 100 nF ceramic capacitor between BOOT and SW provides floating bias for high-side driver |
| 15, 16, SW | Switch node & high-side source | Connect external Schottky diode (D1: 4 A/40 V SMB) and inductor (LO: 1.5 µH); minimize trace length and area |
| PAD | Exposed thermal pad | Mandatory connection to PCB ground plane; thermal performance degrades significantly if left floating or poorly soldered |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with full parametric testing - suitable for under-hood automotive applications |
| Asynchronous architecture with boot-charging MOSFET | 10 Ω low-side switch activates *only* to recharge CBOOT - eliminates continuous conduction loss and improves light-load efficiency |
| Pre-bias startup support | Adapts soft-start sequence when VOUT is pre-charged - prevents reverse current flow into output capacitors during power-up |
| Missing-diode protection | Detects open-circuit condition at D1 and disables switching - prevents uncontrolled VOUT rise and potential downstream damage |
| Pin-fault tolerance | All pins withstand short-to-ground, adjacent-pin shorts, and open-circuit faults - enhances field reliability in harsh environments |
| Stable with ceramic output capacitors | No ESR requirement; supports low-ESR 10 µF ×2 (16 V) CO1/CO2 - simplifies BOM and reduces board area vs. electrolytic solutions |
Applications
| GPS/Infotainment Power Supply | Automobile Audio Amplifier Rail |
|---|---|
Use Scenario: Provides clean 3.3 V rail for GPS module, touchscreen controller, and MCU in vehicle infotainment head unit. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12 V battery to regulated 3.3 V with fast transient response to handle burst data traffic. Use Value: 2.4 MHz switching enables small 1.5 µH inductor and avoids AM radio band; POK signal validates rail before MCU boot sequence. |
Use Scenario: Generates 12 V intermediate rail for Class D audio amplifier from 12 V battery, supporting dynamic bass boost. IC Role / Device Role / Timing Role: High-current buck converter delivering ≥3.5 A with hiccup-mode protection against speaker short circuits. Use Value: 70 mΩ high-side MOSFET minimizes dropout at high load; UVLO stop at 3.8 V prevents brownout during cranking. |
| Home Audio Digital Signal Processor | Network Router PoE Interface |
Use Scenario: Powers DSP and ADC/DAC in premium home theater receiver requiring low-noise, tightly regulated 1.8 V supply. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with external compensation for optimized phase margin across temperature. Use Value: 0.8 V reference and precision feedback enable accurate 1.8 V generation; soft-start prevents inrush into large DSP decoupling banks. |
Use Scenario: Converts 48 V PoE midspan output to 5 V/3.3 V rails for Ethernet PHY and management MCU in enterprise switch. IC Role / Device Role / Timing Role: Wide-input buck controller handling PoE surge (up to 40 V) and maintaining regulation during line transients. Use Value: 36 V max VIN and 40 V surge rating eliminate need for front-end TVS clamping; SYNC input allows jitter-free clock alignment with Ethernet MAC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-Z | 2.4 MHz fixed-frequency, 3.5 A, 4.5–36 V input; no SYNC, no POK, no missing-diode protection | Lacks hiccup-mode OCP and diagnostic outputs; requires external OVP for safety-critical use | Lower cost where AEC-Q100 and fault diagnostics are not required |
| LM61480RQR | 3.5 A, 3.5–36 V, 2.1 MHz, integrated BOOT diode; no missing-diode detection, no pre-bias startup | Uses internal bootstrap diode instead of external MOSFET; less tolerant of output pre-charge conditions | Better for space-constrained designs where boot diode integration outweighs diagnostic gaps |
Compared with MPQ4420AGL-A-Z and LM61480RQR, the A8583KLPTR-T uniquely combines AEC-Q100 qualification, missing-diode protection, pre-bias startup, and POK output - making it the only choice for automotive infotainment and ASIL-B-compliant power stages requiring comprehensive fault coverage.
Availability
A8583KLPTR-T is available at Aetrix Electronics and suitable for GPS/infotainment systems, automobile audio amplifiers, and network router PoE interfaces requiring stable component supply, automotive-grade reliability, and long-term lifecycle continuity.
Supply support for A8583KLPTR-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 A8583 product line delivers robust, AEC-Q100-qualified DC-DC regulators targeting demanding automotive power conversion needs - especially infotainment, ADAS, and body electronics where fault resilience and thermal performance are critical.
FAQ
What is the maximum input voltage rating for the A8583KLPTR-T, and how does it handle automotive load dump?
The A8583KLPTR-T has an absolute maximum VIN rating of 40 V and is explicitly designed to support 40 V surge and load dump testing per ISO 7637-2. Its UVLO stop threshold is 3.8 V (typ), ensuring reliable operation during cold-crank events down to 4.7 V input. The device remains functional across the full 4.7–36 V operating range without derating, making it suitable for direct battery connection in 12 V automotive systems.
Does the A8583KLPTR-T support synchronization to an external clock, and what are the valid frequency and timing constraints?
Yes, the A8583KLPTR-T supports synchronization via its EN/SYNC pin. It accepts an external clock within 1.2× to 1.5× the base fSW set by RFSET (e.g., 2.4 MHz base → up to 2.9 MHz synced). Valid constraints include minimum pulse width of 200 ns, duty cycle ≤80%, and rise/fall times ≤15 ns. Synchronization begins after soft start completes (when VFB > 90% of VREF), ensuring stable lock-in.
How does the A8583KLPTR-T achieve low no-load current, and what is the typical value at 2 MHz?
The A8583KLPTR-T achieves low no-load current through intelligent gate drive: its 10 Ω low-side MOSFET activates *only* to recharge the BOOT capacitor - not every switching cycle - reducing unnecessary conduction loss. At 2 MHz switching, typical no-load current is 3.5 mA. In Sleep mode (EN/SYNC ≤ 0.4 V), control circuitry draws <3 µA, though total VIN current includes high-side MOSFET leakage (~10 µA at 25°C).
What protection features distinguish the A8583KLPTR-T from standard buck controllers?
The A8583KLPTR-T includes several automotive-grade protections not found in generic buck ICs: missing-diode (D1) detection that halts switching if the freewheeling diode opens; pin-fault tolerance (short-to-ground, adjacent-pin shorts, open-circuit) on all pins; hiccup-mode short-circuit response with configurable count limit; and OVP with remote sense (FBX) for accurate overvoltage trip. These features satisfy ASIL-B system-level safety requirements.
Can the A8583KLPTR-T safely start up into a pre-biased output, and how does it manage this behavior?
Yes, the A8583KLPTR-T supports pre-biased startup. When VOUT is pre-charged, the FB pin senses the existing voltage, and the soft-start sequence delays COMP release until SS voltage reaches ~VFB + 330 mV. This prevents reverse current flow into output capacitors and avoids discharging the pre-bias. The feature is enabled by default and requires no external configuration - confirmed in the Functional Description section of the A8583-DS Rev. 18 datasheet.
A8583KLPTR-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):
- 4.7V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 250kHz ~ 2.45MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A8583KLPTR-T FAQ
1.How can I place an order for A8583KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8583KLPTR-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 A8583KLPTR-T reliable?
The price and inventory of A8583KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8583KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8583KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8583KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8583KLPTR-T?
A8583KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8583KLPTR-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 A8583KLPTR-T?
For technical support, including A8583KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8583KLPTR-T requirements.
6.How does Aetrix verify that A8583KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8583KLPTR-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 A8583KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8583KLPTR-T?
All A8583KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8583KLPTR-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 A8583KLPTR-T part is unused and in its original packaging.
Return procedure for A8583KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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