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Allegro MicroSystems A8589KLPTR-T
- Part No.:
- A8589KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A8589KLPTR-T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
A8589KLPTR-T from Allegro MicroSystems is an automotive-grade asynchronous buck regulator designed for car audio and infotainment power supplies. It delivers up to 2.5 A output current with ±1.0% output voltage accuracy (0°C to 85°C), operates from 4.0 V to 35 V input, supports programmable switching frequency from 250 kHz to 2.4 MHz, and features ultra-low-quiescent-current PFM mode drawing ≤50 µA at 12 VIN while maintaining 3.3 VOUT.
For engineers reviewing the A8589KLPTR-T datasheet, A8589KLPTR-T pinout, A8589KLPTR-T application, or A8589KLPTR-T equivalent, key selection considerations include its AEC-Q100 qualification, integrated 110 mΩ high-side MOSFET, NPOR open-drain output, external synchronization capability via PWM/PFMn pin, and thermal shutdown protection at 170°C.
Technical Context
The A8589KLPTR-T implements current-mode control with transconductance error amplifier (gm = 750 µA/V typ), adjustable slope compensation, and pulse-by-pulse overcurrent protection. Its dual-mode operation-PWM (fixed-frequency) and Low-IQ PFM (load-dependent frequency)-enables efficient keep-alive regulation during system standby.
Functional integration includes internal LDO bypass via BIAS pin, BOOT regulator with OV/UV fault detection, pre-bias startup capability, and hiccup-mode short-circuit recovery. The NPOR signal is validated by FB voltage crossing 800 mV with 7.5 ms delay, and SLEEPn enables <10 µA shutdown current at 16 VIN, 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0 V to 35 V - supports wide automotive battery transients including cold-crank (≥3.6 V start) and load-dump (≤40 V surge) |
| Max Output Current | 2.5 A - enabled by integrated 110 mΩ (25°C) high-side N-MOSFET; derated per thermal conditions |
| Output Voltage Accuracy | ±1.0% (0°C to 85°C) - ensures stable microcontroller/DSP core supply under nominal cabin temperature |
| Switching Frequency Range | 250 kHz to 2.4 MHz - adjustable via RFSET; enables EMI optimization and small external component selection |
| Low-IQ PFM Quiescent Current | ≤50 µA at 12 VIN, 3.3 VOUT, 40 µA load - sustains keep-alive rail without draining vehicle battery |
| SLEEPn Shutdown Current | ≤7 µA (typ) at 16 VIN, 85°C - meets automotive "always-on" low-power requirements |
| NPOR Delay | 7.5 ms (typ) - provides reliable power-on reset timing for downstream logic after VOUT regulation |
Pinout & Package
Package: 16-pin TSSOP with exposed thermal pad (LP suffix), lead-free, 100% matte-tin plating. Thermal resistance RθJA = 34°C/W on JEDEC 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 VIN | Power input and high-side MOSFET drain | Accepts 4.0–35 V; requires local ceramic decoupling; withstands 40 V surge |
| 3 SS | Soft-start and hiccup timing node | Capacitor-connected pin sets soft-start ramp time (880 µs typ) and hiccup period |
| 4 SLEEPn | Active-low sleep enable | Pulls device into <10 µA shutdown; 103 µs delay prevents false triggering |
| 5, 13 GND | Analog and power ground reference | Must be connected to PCB ground plane; exposed pad requires ≥6 vias to GND |
| 6 PWM/PFMn | Mode control and sync input | Logic high = PWM; low = Low-IQ PFM; external clock >1.2×fOSC forces synchronization |
| 7 NPOR | Active-low power-on reset output | Open-drain; asserts low until VFB ≥ 800 mV for 7.5 ms; drives external reset logic |
| 8 FSET | Frequency setting input | Resistor-to-GND sets base fOSC (252 kHz to 2.44 MHz); tolerance ±10% |
| 9 COMP | Error amplifier output and compensation node | Connects external RZ/CZ/CP network for loop stability across full frequency range |
| 10 FB | Feedback input | Monitors VOUT via resistor divider; reference = 800 mV ±1.0% (0°C–85°C) |
| 11 BIAS | Bias supply input | Connects to VOUT (3.2–5.5 V) to disable inefficient VIN-LDO and improve light-load efficiency |
| 12 VREG | LDO bypass capacitor node | Requires 1 µF ceramic cap to GND; stabilizes internal 3.05 V regulator |
| 14, 15 SW | Switch node | Drives external freewheeling diode and output inductor; high dv/dt requires tight layout |
| 16 BOOT | High-side gate drive boost | 47 nF ceramic cap to SW provides gate drive voltage; protected against OV/UV faults |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - suitable for under-hood and dashboard mounting |
| Asynchronous buck architecture | Eliminates need for synchronous rectifier MOSFET - simplifies layout and reduces BOM cost |
| External compensation | Full flexibility to optimize transient response and stability across 250 kHz–2.4 MHz and diverse output capacitors |
| Robust fault protection suite | Includes pulse-by-pulse OCP, hiccup-mode short-circuit, BOOT OV/UV, diode OK detection, UVLO, OVP, and thermal shutdown |
| Pre-biased startup | VOUT can be pre-charged without causing NPOR reset - essential for hot-swap and multi-rail sequencing |
Applications
| Instrument Clusters | Car Audio Amplifiers |
|---|---|
Use Scenario: Powering digital gauges, TFT displays, and CAN interface ICs in modern instrument panels requiring always-on functionality. IC Role / Device Role / Timing Role: Primary 3.3 V/5.0 V buck regulator supplying MCU, display driver, and communication PHY. Use Value: Low-IQ PFM mode draws ≤50 µA to maintain VOUT during vehicle sleep, preventing battery drain while enabling instant wake-up. | Use Scenario: Generating clean, regulated 12 V or 5 V rails for Class D amplifier controllers and DSPs in premium audio head units. IC Role / Device Role / Timing Role: High-current (2.5 A) buck stage delivering stable supply despite wide input variation (6–16 V battery). Use Value: Integrated 110 mΩ MOSFET and 2.4 MHz max switching enable compact, low-EMI designs with minimal external components. |
| Infotainment Navigation Systems | HVAC Control Modules |
Use Scenario: Supplying main SoC, memory, and touch controller in Android Auto/Apple CarPlay head units with strict thermal constraints. IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator synchronized to system clock to avoid beat frequencies in sensitive RF sections. Use Value: PWM/PFMn pin accepts external clock (up to 2.9 MHz) for deterministic EMI placement and reduced radiated emissions. | Use Scenario: Providing isolated 3.3 V logic supply for HVAC microcontrollers and sensor interfaces in climate control modules. IC Role / Device Role / Timing Role: Automotive-qualified buck converter with NPOR output ensuring safe boot sequence for safety-critical HVAC firmware. Use Value: NPOR delay of 7.5 ms guarantees VOUT regulation before releasing processor reset, eliminating boot failures due to premature release. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4313-AEC1 | 40 V max input, 3.5 A output, synchronous rectification, fixed 2.2 MHz fSW; no PFM mode or NPOR | Higher current, no keep-alive PFM; lacks dedicated reset output and sleep mode | Choose when higher output current and synchronous efficiency outweigh need for ultra-low-IQ standby and hardware reset signaling |
| TPS54560QDGQRQ1 | 60 V max input, 5 A output, adjustable frequency (100 kHz–2.5 MHz), no integrated high-side FET (external), no NPOR | Wider VIN range and higher current, but requires external MOSFET and lacks integrated reset and sleep control | Choose when input must survive >40 V transients or when board space allows discrete FET layout and external reset generation |
Compared with MPQ4313-AEC1 and TPS54560QDGQRQ1, the A8589KLPTR-T uniquely combines AEC-Q100 qualification, integrated 110 mΩ FET, ultra-low-IQ PFM mode (<50 µA), NPOR output, and SLEEPn control - making it optimal for space-constrained, battery-sensitive automotive infotainment subsystems requiring guaranteed power sequencing and zero-maintenance standby.
Availability
A8589KLPTR-T is available at Aetrix Electronics and suitable for automotive instrument clusters, car audio amplifiers, infotainment navigation systems, and HVAC control modules requiring stable component supply across extended temperature and long production lifecycles.
Supply support for A8589KLPTR-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 A8589 product line is engineered specifically for next-generation automotive infotainment and body electronics, emphasizing ultra-low quiescent current, robust fault protection, and seamless integration with microcontroller-based systems.
FAQ
What is the minimum input voltage required for the A8589KLPTR-T to start switching?
The A8589KLPTR-T begins switching when VIN rises to 3.6 V (typical UVLO turn-on threshold). It continues operation down to 3.4 V (typical falling threshold) before disabling, supporting cold-crank conditions common in 12 V automotive systems. This behavior is confirmed in the Electrical Characteristics table under VIN UVLO Start/Stop specifications.
Does the A8589KLPTR-T support pre-biased output startup?
Yes, the A8589KLPTR-T supports pre-biased startup: if VOUT is already present at power-on, the device will not force it to 0 V or cause a reset event. This is explicitly stated in the Functional Description section and verified by the "Pre-bias startup capable, VOUT will not cause a reset" feature bullet in the datasheet.
How does the NPOR output of the A8589KLPTR-T behave during power-up?
The NPOR output of the A8589KLPTR-T remains low until the FB pin voltage reaches and sustains ≥800 mV for 7.5 ms (typical delay). Only then does NPOR transition to high-impedance state, signaling valid regulation. This behavior is documented in the Electrical Characteristics table (tD(NPOR)) and Functional Description section.
Can the A8589KLPTR-T operate without connecting the BIAS pin?
Yes - the A8589KLPTR-T operates from VIN via an internal LDO when BIAS is unconnected or below 3.2 V. However, connecting BIAS to VOUT (within 3.2–5.5 V) disables the LDO and improves light-load efficiency. This dual-path architecture is described in the BIAS Input Functionality section and Electrical Characteristics (VBIAS range).
What protection features are integrated into the A8589KLPTR-T?
The A8589KLPTR-T integrates pulse-by-pulse current limit, hiccup-mode short-circuit protection, BOOT OV/UV detection, asynchronous diode open/short protection, VIN undervoltage lockout, VOUT overvoltage protection, and thermal shutdown at 170°C (typ). These are listed in the datasheet's "Extensive protection features" paragraph and verified in the Electrical Characteristics table.
A8589KLPTR-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):
- 35V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 250kHz ~ 2.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A8589KLPTR-T FAQ
1.How can I place an order for A8589KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8589KLPTR-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 A8589KLPTR-T reliable?
The price and inventory of A8589KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8589KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8589KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8589KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8589KLPTR-T?
A8589KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8589KLPTR-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 A8589KLPTR-T?
For technical support, including A8589KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8589KLPTR-T requirements.
6.How does Aetrix verify that A8589KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8589KLPTR-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 A8589KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8589KLPTR-T?
All A8589KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8589KLPTR-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 A8589KLPTR-T part is unused and in its original packaging.
Return procedure for A8589KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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