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Allegro MicroSystems A80804KETASR
- Part No.:
- A80804KETASR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
A80804KETASR.pdf
- Description:
- FOUR-CHANNEL, AUTOMOTIVE LED CON
- Quantity:
- Payment:
- Shipping:
Inventory:4,676
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Product details
Overview
A80804KETASR from Allegro MicroSystems is a high-power automotive LED driver IC implementing a current-mode boost/SEPIC converter with external N-channel MOSFET gate driver and four integrated 210 mA LED current sinks. It supports 4.5–40 V input, achieves 15,000:1 PWM dimming contrast at 200 Hz, and is AEC-Q100 qualified for exterior lighting and HUD applications.
For engineers reviewing the A80804KETASR datasheet, A80804KETASR pinout, A80804KETASR application, or A80804KETASR equivalent, this page delivers verified specifications, fault-handling behavior, Pre-Emptive Boost timing, thermal derating guidance, and validated alternative part selection - all grounded in Allegro's official A80601 family documentation and package-specific characterization.
Technical Context
The A80804KETASR operates as a multi-string LED regulator with programmable switching frequency (260 kHz–2.3 MHz), external synchronization capability, and spread-spectrum dithering to reduce EMI. Its Pre-Emptive Boost (PEB) control algorithm coordinates gate drive timing with LED sink activation to minimize output ripple and enable sub-microsecond PWM on-time (0.3 µs).
It integrates cycle-by-cycle current limiting, overvoltage protection via OVP pin, open/shorted-LED detection during startup, and thermal shutdown at 170°C. Fault handling follows the "One-Out-All-Out" policy per A80601-1 variant specification, latching off on any single LED string fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V startup; sustains operation down to 4 V - withstands cold crank and load dump transients in 12 V/24 V automotive systems. |
| LED Current Sinks | Four precision sinks, each up to 210 mA; paralleled operation supports up to 840 mA total - enables flexible string configuration for mid-size LCD backlighting and exterior lamps. |
| PWM Dimming Ratio | 15,000:1 at 200 Hz (PWM only); 150,000:1 with combined PWM + analog dimming - meets stringent contrast requirements for heads-up displays. |
| Switching Frequency | 260 kHz to 2.3 MHz, externally synchronizable or resistor-programmed - allows AM-band avoidance and system-level EMI coordination via CLKOUT. |
| Thermal Resistance | RθJA = 37 °C/W on 4-layer JEDEC PCB - requires thermal pad connection with ≥8 vias for reliable operation at full load in –40°C to 125°C ambient. |
| Fault Handling | One-Out-All-Out behavior - shuts down all LED strings upon detection of any single open/shorted LED fault, supporting ASIL B system compliance. |
| AEC-Q100 Grade | Qualified to Grade 1 (–40°C to +125°C junction) - certified for under-hood and exterior automotive lighting modules. |
Pinout & Package
Package: 24-pin 4 mm × 4 mm QFN with wettable flank and exposed thermal pad. Requires solder mask defined pad, minimum 8 thermal vias to internal ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 13–16 | LED1–LED4 | Cathode-side current sinks; each regulates up to 210 mA; unused pins must be terminated to AGND via 2.37 kΩ resistor. |
| 5, 6, 7, 8, 9, 10, 11, 12, 17, 18, 19, 20, 21, 22, 23, 24 | AGND, COMP, ISET, DITH, FSET, ADIM, PWM, EN, CLKOUT, PEB, OVP, PGND, VDRV, CS, GDRV, GATE, VSENSE, VIN, FAULT, VDD | Support functions including error amplification (COMP), LED current setting (ISET), frequency programming (FSET), analog dimming (ADIM), gate drive (GDRV/GATE), fault reporting (FAULT), and input sensing (VSENSE/VIN). |
| PAD | Exposed Thermal Pad | Primary thermal path; must be soldered to PCB ground plane with ≥8 vias for RθJA = 37 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-Emptive Boost (PEB) Control | Coordinates boost switch turn-on with LED sink activation to suppress output voltage ripple and eliminate MLCC audible noise - enables stable ceramic capacitor use. |
| Sub-Microsecond PWM Timing | Minimum 0.3 µs PWM on-time supported - essential for ultra-high contrast ratio dimming without visible flicker in HUD and infotainment displays. |
| Programmable Spread Spectrum | Dithering range and modulation frequency set via DITH/FSET pins - reduces peak EMI by >10 dB without compromising regulation accuracy. |
| Robust Fault Protection | Detects open/shorted LED strings, output overvoltage, input overcurrent, and thermal overload - latches off on first fault per One-Out-All-Out policy. |
| Flexible Dimming Interface | Accepts both PWM signals (200 Hz–2 kHz) and analog inputs (DC 0.2–2 V or APWM 40–1000 kHz) - simplifies integration with MCU or dedicated dimming controllers. |
Applications
| Automotive Exterior Lighting | Automotive Heads-Up Display (HUD) |
|---|---|
Use Scenario: Adaptive front lighting systems (AFS) and dynamic turn indicators requiring precise, high-current LED string control under wide input voltage transients. IC Role / Device Role / Timing Role: Primary LED current regulator with boost/SEPIC topology, gate driver for external MOSFET, and real-time fault response for safety-critical illumination. Use Value: Withstands 4 V brownout and 40 V load dump events while maintaining 210 mA per channel accuracy and <3% matching across strings. | Use Scenario: High-brightness, high-contrast projection-based HUDs where LED dimming linearity and ripple-free output are critical for image clarity. IC Role / Device Role / Timing Role: Ultra-low-noise LED driver using Pre-Emptive Boost to eliminate ceramic capacitor buzz and support 150,000:1 analog+PWM dimming range. Use Value: Achieves <0.4 µs minimum PWM on-time and <1% output ripple - prevents visual artifacts and ensures consistent luminance gradation. |
| Infotainment LCD Backlighting | Automotive Interior Ambient Lighting |
Use Scenario: Mid-size center-stack and instrument cluster LCDs needing uniform brightness, low EMI, and seamless dimming across temperature extremes. IC Role / Device Role / Timing Role: Multi-string current source with synchronized CLKOUT output, enabling coordinated dimming with other power stages in the head unit. Use Value: 260 kHz–2.3 MHz programmable switching frequency avoids AM band interference; dithering reduces conducted emissions below CISPR 25 Class 5 limits. | Use Scenario: RGB ambient lighting zones requiring independent channel control, fast transient response, and fault-isolated shutdown behavior. IC Role / Device Role / Timing Role: Four-channel current sink with One-Out-All-Out fault propagation - ensures complete zone deactivation upon single LED failure for functional safety. Use Value: Integrated open/short detection during startup and thermal shutdown at 170°C prevent thermal runaway in enclosed cabin modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-power automotive LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A80601KESJSR | Same silicon, One-Out-Continue fault handling - remains operational with one failed LED string. | Suitable for non-safety-critical backlighting where partial functionality is acceptable after fault. | Select when system-level fault tolerance permits continued operation despite single-string failure. |
| MAX20051ATPA/VY+ | 3-channel, 150 mA/channel; integrated MOSFET; no Pre-Emptive Boost; 10,000:1 dimming ratio. | Limited to lower-power interior lighting; lacks PEB ripple suppression and ultra-high contrast capability. | Choose for cost-sensitive, space-constrained designs where 210 mA/channel and 150,000:1 dimming are not required. |
Compared with A80804KETASR, A80601KESJSR offers higher system availability but reduced functional safety compliance, while MAX20051ATPA/VY+ trades dimming performance and external power scalability for integration and footprint reduction - making A80804KETASR optimal for ASIL B-compliant exterior/HUD applications demanding maximum contrast and ripple control.
Availability
A80804KETASR is available at Aetrix Electronics and suitable for automotive exterior lighting, heads-up display systems, and infotainment backlighting requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.
Supply support for A80804KETASR 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 designer of high-performance power ICs and magnetic sensors, serving automotive, industrial, and consumer markets since 1989.
The A80804KETASR belongs to Allegro's A80601 family of high-power LED drivers engineered specifically for ASIL B-compliant automotive lighting - emphasizing ultra-high dimming ratio, Pre-Emptive Boost ripple suppression, and robust fault handling under harsh electrical conditions.
FAQ
What is the A80804KETASR's fault-handling behavior?
The A80804KETASR implements One-Out-All-Out fault handling: if any single LED string is detected as open or shorted during startup or operation, the IC latches off all four current sinks and pulls the FAULT pin low. Recovery requires either power cycling or holding PWM low for >16 ms. This behavior aligns with ASIL B system-level safety requirements and differs from the One-Out-Continue mode of A80601KESJSR.
Does the A80804KETASR integrate a MOSFET or require an external one?
The A80804KETASR does not integrate a power MOSFET. It provides a high-current gate driver (GDRV) for an external N-channel MOSFET used in the boost/SEPIC power stage, plus a separate GATE pin for an optional P-channel input disconnect switch. This architecture enables scalable output power up to 11 W per string and thermal separation between control logic and power switching.
What is the minimum PWM on-time supported by the A80804KETASR?
The A80804KETASR supports a minimum PWM on-time of 0.3 µs, verified across temperature and supply voltage ranges. This capability is enabled by its Pre-Emptive Boost timing architecture and fast gate driver (7 ns rise/fall time), allowing it to achieve 15,000:1 contrast ratio at 200 Hz - a key requirement for automotive heads-up displays and high-end infotainment backlighting.
How is LED current accuracy maintained across channels and temperature?
The A80804KETASR achieves ≤0.7% typical LED current accuracy and ≤0.8% channel-to-channel matching via trimmed ISET reference voltage (0.985 V ±30 mV) and gain-stabilized current mirror architecture. Accuracy is maintained from –40°C to +125°C due to on-chip temperature compensation of the ISET-to-ILED transfer function and matched layout of current sink transistors within the 24-pin QFN die.
Can the A80804KETASR operate below 4.5 V input?
Yes - the A80804KETASR starts only above 4.5 V (VIN UVLO rising threshold), but once operational, it continues functioning down to 4.0 V (VIN UVLO falling threshold). This 0.5 V hysteresis enables uninterrupted operation during automotive stop/start cycles and cold-crank events where battery voltage dips transiently below nominal 12 V.
A80804KETASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 5.3V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-QFN (5x5)
A80804KETASR FAQ
1.How can I place an order for A80804KETASR through Aetrix?
Please submit a Request for Quotation (RFQ) for A80804KETASR 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 A80804KETASR reliable?
The price and inventory of A80804KETASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A80804KETASR is usually 5 days.
3.What payment methods are accepted for A80804KETASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A80804KETASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A80804KETASR?
A80804KETASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A80804KETASR 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 A80804KETASR?
For technical support, including A80804KETASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A80804KETASR requirements.
6.How does Aetrix verify that A80804KETASR is sourced from the original manufacturer or authorized distributors?
All A80804KETASR 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 A80804KETASR meets industry standards.
7.What is the process for return or replacement of A80804KETASR?
All A80804KETASR units undergo pre-shipment inspection (PSI). If there is an issue with A80804KETASR, 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 A80804KETASR part is unused and in its original packaging.
Return procedure for A80804KETASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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