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Allegro MicroSystems A80803KETASR
- Part No.:
- A80803KETASR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
A80803KETASR.pdf
- Description:
- IC LED DRIVER CTRLR PWM 32QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
A80803KETASR from Allegro MicroSystems is a multi-topology, constant-current DC/DC LED controller for automotive high-beam/low-beam lighting systems. It integrates dual gate drivers (low-side and high-side), two beam-control drivers (LBG/HBG), SPI interface, 5 V/50 mA linear regulator (VREG), and programmable PWM dimming - supporting boost and buck-boost topologies with slew-rate-controlled topology changeover. It operates across 5–37 V input and delivers up to 70 V output OVP protection.
For engineers reviewing the A80803KETASR datasheet, A80803KETASR pinout, A80803KETASR application, or A80803KETASR equivalent, key selection criteria include its dual-beam gate driver architecture, four-bin LED current programming via BINSEL, internal/external PWM dimming flexibility, fault reporting via dual open-drain FFn pins, and thermally enhanced 32-pin QFN package with wettable flanks.
Technical Context
The A80803KETASR implements peak current mode control with programmable fixed-frequency oscillator (70–700 kHz via FSET resistor) and optional dithering (±5% to ±15%, 5–22 kHz modulation) for EMC mitigation. Its inner current loop uses SP-based slope-compensated inductor sensing, while outer loop regulates LED current via differential sense across LP/LN with 200 mV nominal reference.
It supports topology reconfiguration between high-beam (HBG-driven boost) and low-beam (LBG/LBS-driven buck-boost) using LBEAMn control, with dedicated SLEW filtering to minimize current overshoot during transitions. Fault handling includes hardware-level reporting on FFn1/FFn2 and SPI-accessible register-based diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5–37 V operating; 40 V absolute max for load dump - enables direct battery connection in 12 V/24 V automotive systems. |
| Output Voltage Capability | Up to 70 V OVP rating - supports long LED strings in headlamp applications without external overvoltage clamping. |
| Switching Frequency | Programmable 70–700 kHz via FSET resistor - allows optimization of efficiency, size, and EMI for specific layout and thermal constraints. |
| LED Current Regulation | Constant-current control with 200 mV ±2 mV LP–LN sense voltage - sets precise LED current via external sense resistor; supports four binning levels via BINSEL. |
| Integrated Regulators | VREG: 5 V / 50 mA LDO; VDRV: 6 V gate driver supply - powers external circuitry and internal drivers without auxiliary supplies. |
| Fault Reporting | Dual open-drain FFn1/FFn2 pins + SPI register access - enables both hardwired system-level fault signaling and configurable diagnostic granularity. |
| Thermal Package | 32-pin 5 mm × 5 mm QFN with exposed thermal pad and wettable flank - achieves 28 °C/W RθJA on 4-layer JEDEC board for high-power LED thermal management. |
Pinout & Package
Package: 32-pin 5 mm × 5 mm QFN with exposed thermal pad and wettable flank (suffix ET). Thermal pad must be tied to GND plane for optimal junction-to-ambient thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LSG | Low-side gate driver output | Drives source of main NMOS switch in all topologies; 1.4 A sink/1.6 A source capability ensures fast MOSFET switching. |
| HSG | High-side gate driver output | Drives gate of synchronous NMOS switch referenced to SW node; supports boot capacitor operation up to 90 V. |
| LBG / LBS | Low-beam PFET gate/source drivers | LBG drives gate of low-beam PFET relative to LBS; LBS connects to VIN when unused - enables buck-boost low-beam configuration. |
| HBG | High-beam NFET gate driver | Drives gate of high-beam boost NFET referenced to GND - simplifies high-beam boost topology implementation. |
| LP / LN | LED current sense inputs | Differential pair measuring LED string current; 200 mV nominal sense voltage sets regulated current via external resistor. |
| EN/PWM | Enable and external PWM input | Active-high enable; accepts external PWM pulses ≤1 kHz for direct LED dimming - disables device if held low >30 ms. |
| PWMOUT | Dimming MOSFET driver output | Drives high-side PFET in series with LED string; programmable drive strength optimizes current transition behavior during PWM dimming. |
| LBEAMn | Beam mode select input | Active-low logic input: LBEAMn = 0 → low-beam mode; LBEAMn = 1 → high-beam mode - triggers topology reconfiguration. |
| VREG | 5 V / 50 mA linear regulator output | Stable 4.9–5.1 V supply for microcontrollers, sensors, or level shifters; requires 2.2 µF ceramic capacitor for stability. |
| NTC | Analog dimming and thermal foldback input | Accepts voltage from NTC thermistor network to dynamically reduce LED current under thermal stress - prevents overheating. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-topology support (boost/buck-boost) | Enables single-controller implementation of both high-beam (boost) and low-beam (buck-boost) functions - reduces BOM count and PCB area. |
| Slew-rate controlled topology changeover | Dedicated SLEW pin filters gate drive edges during beam switching - eliminates current overshoot/undershoot and EMI spikes during high/low transition. |
| Four-bin LED current programming | BINSEL pin selects one of four factory-calibrated current reference levels - compensates for LED forward-voltage binning without firmware or external DAC. |
| Configurable fault reporting | FFn2 pin behavior (assertion delay, fault mask) is programmable via SPI - allows tailoring of fault response to system safety requirements (e.g., ASIL-B). |
| Internal PWM generator with programmable drive | On-chip 100–1000 Hz PWM engine controls PWMOUT; drive strength adjustable via SPI - ensures clean, jitter-free dimming without external timing components. |
| EEPROM-configurable parameters | Startup settings (frequency, soft-start, dithering, fault masks) stored in on-chip EEPROM - eliminates need for host MCU initialization sequence. |
Applications
| Adaptive Front-Lighting System (AFS) | Daytime Running Light (DRL) with Dimming |
|---|---|
|
Use Scenario: Dynamic beam shaping using multiple LED segments activated selectively based on steering angle and speed. IC Role / Device Role / Timing Role: A80803KETASR acts as the primary constant-current controller for each LED segment, enabling independent high/low beam and cornering light activation via LBEAMn and PWMOUT. Use Value: Slew-controlled topology switching ensures seamless, flicker-free transitions between beam patterns - critical for driver comfort and regulatory compliance (ECE R149). |
Use Scenario: DRL operation at reduced brightness during daylight, with automatic dimming at dusk or tunnel entry. IC Role / Device Role / Timing Role: A80803KETASR regulates LED current via analog foldback (NTC/VIN) and internal PWM - maintains consistent luminance across temperature and battery voltage variations. Use Value: Four-bin current programming compensates for LED Vf spread across production batches - ensures uniform DRL intensity without per-unit calibration. |
| Matrix Beam Headlamp | Commercial Vehicle High-Intensity Lighting |
|
Use Scenario: Pixelated headlamp with individually addressable LED zones for glare-free high-beam and adaptive cut-off. IC Role / Device Role / Timing Role: A80803KETASR controls grouped LED strings per zone; SPI interface configures per-zone current, dimming, and fault thresholds. Use Value: Dual FFn fault pins allow zone-level fault isolation - enables graceful degradation (e.g., disable only faulty zone) rather than full headlamp shutdown. |
Use Scenario: Heavy-duty truck headlamps requiring robust 24 V operation, load-dump immunity, and thermal resilience in harsh environments. IC Role / Device Role / Timing Role: A80803KETASR serves as the main LED driver with 40 V absolute max input rating and 150 °C junction temperature support - withstands ISO 7637-2 pulse 5a/b. Use Value: Wettable-flank QFN package ensures reliable solder joint inspection and thermal reliability under vibration and thermal cycling - meets JESD22-A108 qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-topology LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20051ATG+T | Single-topology (boost-only) controller; no integrated low-beam buck-boost drivers (LBG/LBS); lacks BINSEL binning and SLEW-controlled transition. | Requires external PFET drivers and separate low-beam controller for dual-beam systems - increases component count and layout complexity. | Choose when only high-beam boost is needed and cost-per-function is prioritized over integration. |
| TPS92692QPWPRQ1 | Fixed-frequency current-mode controller with integrated high-side driver only; no LBG/HBG dual-beam architecture or topology changeover capability. | Supports single-string LED driving only; cannot natively implement high/low beam switching without external MOSFETs and logic. | Prefer for simpler, single-beam designs where SPI configurability and thermal foldback are secondary to footprint and bill-of-materials. |
Compared with MAX20051ATG+T and TPS92692QPWPRQ1, the A80803KETASR uniquely integrates dual-beam gate drivers, slew-controlled topology switching, and four-bin current programming - delivering higher functional integration and reduced system-level design effort for automotive adaptive lighting.
Availability
A80803KETASR is available at Aetrix Electronics and suitable for automotive headlamp modules, adaptive front-lighting systems, and commercial vehicle lighting requiring stable component supply, AEC-Q100 Grade 1 qualification, and long-term production continuity.
Supply support for A80803KETASR 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 A80803KETASR belongs to Allegro's automotive LED controller product line, designed specifically for intelligent, multi-mode headlamp systems requiring high reliability, thermal resilience, and functional safety support.
FAQ
What is the maximum LED string voltage supported by the A80803KETASR?
The A80803KETASR features a 75 V fixed overvoltage protection threshold measured between LP and GND, with typical OVP rating up to 70 V. This allows safe operation with LED strings requiring up to ~65 V forward voltage under nominal conditions, accommodating voltage margin for transients and temperature drift. The device does not regulate above this threshold - it triggers hiccup-mode shutdown to protect downstream components.
How does the A80803KETASR handle thermal overload conditions?
The A80803KETASR monitors junction temperature and initiates overtemperature shutdown at 155–170 °C (typical 170 °C), with 20 °C hysteresis for recovery. During thermal events, it activates LED current foldback via the NTC pin and reduces output current proportionally before reaching shutdown - preserving light output while preventing damage. This behavior is fully configurable via SPI registers.
Can the A80803KETASR operate without an external microcontroller?
Yes. The A80803KETASR supports standalone operation via factory-programmed EEPROM: frequency, soft-start time, dithering, fault masks, and dimming modes can be pre-configured. External control via SPI is optional - not required for basic high/low beam switching, PWM dimming, or analog foldback functionality.
What is the purpose of the SLEW pin on the A80803KETASR?
The SLEW pin connects to an RC filter that controls the slew rate of LBG, HBG, and topology-switching MOSFETs. By limiting edge rates during beam transitions, it suppresses current overshoot/undershoot and associated EMI - essential for meeting CISPR 25 Class 5 radiated emissions limits in automotive headlamp designs.
Does the A80803KETASR support analog dimming in addition to PWM?
Yes. The A80803KETASR supports analog dimming through three independent paths: (1) VIN-dependent foldback via internal scaling, (2) NTC-based thermal foldback, and (3) direct voltage injection on the NTC pin for custom dimming curves. These operate simultaneously with internal/external PWM, enabling hybrid dimming strategies for smooth brightness control.
A80803KETASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Constant Current
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 37V
- Voltage - Output:
- 70V
- Current - Output / Channel:
- -
- Frequency:
- 70kHz ~ 700kHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-QFN (5x5)
A80803KETASR FAQ
1.How can I place an order for A80803KETASR through Aetrix?
Please submit a Request for Quotation (RFQ) for A80803KETASR 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 A80803KETASR reliable?
The price and inventory of A80803KETASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A80803KETASR is usually 5 days.
3.What payment methods are accepted for A80803KETASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A80803KETASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A80803KETASR?
A80803KETASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A80803KETASR 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 A80803KETASR?
For technical support, including A80803KETASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A80803KETASR requirements.
6.How does Aetrix verify that A80803KETASR is sourced from the original manufacturer or authorized distributors?
All A80803KETASR 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 A80803KETASR meets industry standards.
7.What is the process for return or replacement of A80803KETASR?
All A80803KETASR units undergo pre-shipment inspection (PSI). If there is an issue with A80803KETASR, 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 A80803KETASR part is unused and in its original packaging.
Return procedure for A80803KETASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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