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Allegro MicroSystems A80604KESJSR
- Part No.:
- A80604KESJSR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
A80604KESJSR.pdf
- Description:
- WIDE INPUT VOLTAGE RANGE BOOST/S
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
A80604KESJSR from Allegro MicroSystems is an AEC-Q100 qualified automotive LED driver IC implementing a current-mode boost/SEPIC converter with external N-channel MOSFET gate driver. It delivers four integrated 210 mA current sinks, operates from 4.5–40 V input, withstands cold crank (down to 4 V), and achieves 15,000:1 PWM dimming contrast at 200 Hz for exterior lighting and HUD applications.
For engineers reviewing the A80604KESJSR datasheet, A80604KESJSR pinout, A80604KESJSR application, or A80604KESJSR equivalent, key selection considerations include Pre-Emptive Boost control, 24-pin wettable-flank QFN package, ASIL B fault handling, 260 kHz–2.3 MHz programmable switching frequency, and support for combined PWM/analog dimming up to 150,000:1 contrast ratio.
Technical Context
The A80604KESJSR integrates a current-mode boost/SEPIC controller with cycle-by-cycle peak current limiting, external gate drive for high-side N-MOSFET, and four precision LED current sinks with ±0.7% accuracy and <2% channel matching. Its Pre-Emptive Boost algorithm synchronizes boost switch timing with LED sink activation to minimize output ripple and enable sub-microsecond PWM on-time (0.3 µs).
It supports external synchronization or internal frequency programming (260 kHz–2.3 MHz), programmable dithering for EMI reduction, CLKOUT for multi-converter sync, and comprehensive fault protection including open/shorted LED detection, overvoltage, overtemperature (170°C shutdown), and input overcurrent with optional P-MOSFET disconnect.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5–40 V startup; sustains operation down to 4 V - enables robustness during automotive stop/start and cold-crank transients. |
| LED Current Sinks | 4 × 210 mA max per channel; paralleling supports up to 840 mA total - suitable for mid-size LCD backlights and multi-string exterior lamps. |
| PWM Dimming Ratio | 15,000:1 at 200 Hz (PWM only); 150,000:1 (PWM + analog) - meets high-dynamic-range HUD and adaptive lighting requirements. |
| Switching Frequency | 260 kHz–2.3 MHz, externally syncable or resistor-programmed - allows AM-band avoidance and EMI optimization via dithering. |
| Package | 24-pin 4 mm × 4 mm QFN with wettable flank and exposed thermal pad - supports automated optical inspection and 37 °C/W θJA on 4-layer PCB. |
| Fault Handling | One-Out-Continue mode - maintains operation of remaining LED strings if one string fails open or shorted. |
| AEC-Q100 Grade | Qualified to Grade 1 (–40°C to +125°C ambient) - validated for under-hood and headlamp module deployment. |
Pinout & Package
24-pin 4 mm × 4 mm QFN with wettable flank and exposed thermal pad (ES package). Thermal pad must be connected to PCB ground plane via ≥8 vias for reliable thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 11–14, 16, 18–24 | Functional pins (see table below) | Each pin serves defined analog/digital/power function; no unused or NC pins. |
| AGND (Pin 1) | Analog ground reference | Provides quiet return path for ISET, COMP, ADIM, and other sensitive analog signals. |
| ISET (Pin 3) | LED current programming input | Resistor-to-ground sets full-scale current (e.g., 8.33 kΩ → 120 µA → 210 mA per channel). |
| PWM (Pin 7) | Digital brightness control | Accepts 200 Hz–2 kHz PWM signal; minimum on-time 0.3 µs enables ultra-high dimming ratio. |
| GDRV (Pin 19) | N-MOSFET gate driver output | Drives external high-side N-channel boost switch with 2 A peak sink/source capability. |
| VSENSE (Pin 21) | Input current sense input | Monitors VIN–VSENSE voltage drop across RSC to trigger input overcurrent protection. |
| FAULT (Pin 23) | Open-drain fault status output | Pulled low on OVP, OTP, LED short/open, or CS overcurrent - used for system-level fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-Emptive Boost (PEB) control | Synchronizes boost switch turn-on with LED sink activation to suppress output ripple and eliminate MLCC audible noise. |
| Programmable switching frequency dithering | Reduces EMI peaks by modulating fSW with user-selectable range (±5%) and modulation frequency (1–22 kHz). |
| One-Out-Continue fault response | Continues driving remaining functional LED strings when one string fails - improves system availability in safety-critical lighting. |
| Integrated 4-channel current sinks | ±0.7% absolute accuracy and <2% inter-channel matching - eliminates need for external current-setting resistors per channel. |
| CLKOUT synchronization output | Provides buffered copy of internal oscillator signal - enables deterministic timing alignment across multiple converters in multi-rail systems. |
Applications
| Automotive Exterior Lighting | Automotive Heads-Up Display (HUD) |
|---|---|
Use Scenario: Adaptive front lighting systems (AFS) with dynamic beam shaping using multiple LED strings. IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller managing four independent 210 mA channels with synchronized dimming. Use Value: One-Out-Continue fault handling ensures partial functionality during single-string failure; Pre-Emptive Boost minimizes ripple-induced flicker in high-brightness projection optics. | Use Scenario: Compact HUD projector requiring ultra-high contrast ratio and low-noise illumination under varying ambient light. IC Role / Device Role / Timing Role: High-precision LED driver delivering stable current to RGB or white LED arrays with sub-microsecond PWM timing control. Use Value: 15,000:1 contrast at 200 Hz and 150,000:1 with analog assist meet HUD luminance uniformity specs; dithering reduces EMI interference with display timing circuits. |
| Mid-Size Automotive LCD Backlight | Automotive Infotainment Display Backlight |
Use Scenario: 7–10 inch center-stack displays needing local dimming zones and wide dimming range. IC Role / Device Role / Timing Role: Multi-string LED driver supporting parallel sink configuration (up to 840 mA) and programmable fSW for optimal efficiency vs. EMI trade-off. Use Value: 4.5–40 V input range accommodates battery transients; 24-pin QFN enables compact layout near edge-lit light guide. | Use Scenario: Cluster or infotainment display backlight with ASIL-B compliance requirements and thermal constraints. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 LED driver providing fault diagnostics (open/short LED detection), thermal shutdown (170°C), and VDD LDO regulation. Use Value: Integrated fault reporting via FAULT pin simplifies BMS integration; wettable flank QFN supports AOI for high-reliability manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMYX/NOPB | Single-channel buck-boost LED driver; no integrated current sinks; requires external current sense per channel. | Lacks multi-string integration and Pre-Emptive Boost; lower dimming ratio (1000:1 typical). | Choose for cost-sensitive single-string designs where board space permits discrete current regulation. |
| MAX20050ATP/V+T | 4-channel automotive LED driver with 150 mA per channel; supports only boost topology; no dithering or CLKOUT. | Lower max current per channel; no One-Out-Continue fault mode; fixed 2.2 MHz fSW. | Choose when strict 2.2 MHz operation is required and thermal margin allows reduced per-channel current. |
Compared with LM3409QMYX/NOPB and MAX20050ATP/V+T, the A80604KESJSR uniquely combines four 210 mA sinks, Pre-Emptive Boost, programmable dithering, and One-Out-Continue fault handling - making it optimal for high-reliability, high-contrast automotive lighting where system-level availability and EMI performance are critical.
Availability
A80604KESJSR is available at Aetrix Electronics and suitable for automotive exterior lighting, heads-up display, and mid-size LCD backlighting requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for A80604KESJSR 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 A80604 product line is designed specifically for high-reliability automotive LED lighting applications demanding ultra-high dimming ratios, robust fault tolerance, and seamless integration into ASIL-B compliant systems.
FAQ
What is the minimum input voltage required for A80604KESJSR startup?
The A80604KESJSR requires a minimum input voltage of 4.5 V to initiate startup due to its VIN UVLO rising threshold of 4.45 V. However, once operational, it sustains regulation down to 4.0 V - enabling uninterrupted function during automotive cold-crank events. This behavior is confirmed in the Electrical Characteristics table under "VIN UVLO Start Threshold" and "VIN UVLO Stop Threshold" specifications.
How does the Pre-Emptive Boost (PEB) feature improve performance in A80604KESJSR?
The Pre-Emptive Boost (PEB) feature in A80604KESJSR synchronizes the timing of the external boost switch turn-on with LED current sink activation to minimize output voltage ripple and eliminate audible noise from ceramic output capacitors. This enables stable 15,000:1 PWM dimming contrast at 200 Hz and supports sub-microsecond PWM on-times (0.3 µs), directly contributing to high-fidelity illumination in HUD and adaptive lighting systems.
Can A80604KESJSR drive more than four LED strings?
Yes - the A80604KESJSR's four integrated current sinks can be paralleled to support higher total LED current, up to 840 mA. Each sink delivers up to 210 mA, and paralleling is implemented by connecting multiple LEDx pins (LED1–LED4) to a common cathode node. The datasheet confirms this capability in the "Description" section and specifies matching accuracy (<2%) to ensure balanced current sharing between paralleled channels.
What fault protection mechanisms are built into A80604KESJSR?
The A80604KESJSR includes overvoltage protection (OVP), overtemperature shutdown (170°C), open/shorted LED detection, cycle-by-cycle boost switch overcurrent limiting, input overcurrent detection with optional P-MOSFET disconnect, and FSET/ISET pin open/short fault detection. Its One-Out-Continue fault handling mode maintains operation of remaining LED strings during single-string failure - a key differentiator for ASIL-B system compliance as stated in the "Features and Benefits" section.
Is A80604KESJSR pin-compatible with A80604KESJSR-1?
No - A80604KESJSR and A80604KESJSR-1 share identical pinout and package but differ in fault-handling behavior: A80604KESJSR uses One-Out-Continue, while A80604KESJSR-1 implements One-Out-All-Out. This functional difference is documented in the Selection Guide and Functional Description sections; no mechanical or electrical incompatibility exists, but system-level fault response logic must be revalidated when substituting between them.
A80604KESJSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 210mA
- Frequency:
- 260kHz ~ 2.3MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
A80604KESJSR FAQ
1.How can I place an order for A80604KESJSR through Aetrix?
Please submit a Request for Quotation (RFQ) for A80604KESJSR 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 A80604KESJSR reliable?
The price and inventory of A80604KESJSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A80604KESJSR is usually 5 days.
3.What payment methods are accepted for A80604KESJSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A80604KESJSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A80604KESJSR?
A80604KESJSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A80604KESJSR 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 A80604KESJSR?
For technical support, including A80604KESJSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A80604KESJSR requirements.
6.How does Aetrix verify that A80604KESJSR is sourced from the original manufacturer or authorized distributors?
All A80604KESJSR 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 A80604KESJSR meets industry standards.
7.What is the process for return or replacement of A80604KESJSR?
All A80604KESJSR units undergo pre-shipment inspection (PSI). If there is an issue with A80604KESJSR, 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 A80604KESJSR part is unused and in its original packaging.
Return procedure for A80604KESJSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A80604KESJSR Tags
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