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Allegro MicroSystems A80604KESJSR-1
- Part No.:
- A80604KESJSR-1
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
A80604KESJSR-1.pdf
- Description:
- WIDE INPUT VOLTAGE RANGE BOOST/S
- Quantity:
- Payment:
- Shipping:
Inventory:3,791
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Product details
Overview
A80604KESJSR-1 from Allegro MicroSystems is a 4-channel automotive LED driver IC implementing a current-mode boost/SEPIC converter with external N-channel MOSFET gate driver, delivering up to 210 mA per channel (840 mA total when paralleled), operating from 4.5–40 V input, and achieving 15,000:1 PWM dimming contrast ratio at 200 Hz for exterior lighting and HUD applications.
For engineers reviewing the A80604KESJSR-1 datasheet, A80604KESJSR-1 pinout, A80604KESJSR-1 application, or A80604KESJSR-1 equivalent, key selection considerations include its One-Out-All-Out fault handling, Pre-Emptive Boost control enabling ultra-low PWM on-time (0.3 µs), 260 kHz–2.3 MHz programmable switching frequency, and AEC-Q100 qualification for automotive systems.
Technical Context
The A80604KESJSR-1 integrates four precision current sinks with ±0.7% accuracy and 0.8% matching, paired with a high-speed gate driver (2 A peak sink/source, 7 ns rise/fall) for external boost MOSFETs. Its Pre-Emptive Boost algorithm synchronizes boost switch timing with LED sink activation to minimize output ripple and eliminate MLCC audible noise.
It supports dual dimming modes: PWM dimming with sub-microsecond minimum on-time and analog dimming via ADIM pin (DC 0.2–2 V or 40–1000 kHz APWM), enabling combined PWM+analog dimming for 150,000:1 contrast. Fault protection includes cycle-by-cycle current limiting, open/shorted-LED detection, overvoltage (OVP), overtemperature (TSD = 170°C), and input disconnect via optional P-MOSFET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5–40 V startup; sustains operation down to 4 V - withstands automotive cold-crank and load-dump transients. |
| LED Current per Channel | Up to 210 mA with ±0.7% accuracy - enables precise brightness control across four independent strings. |
| PWM Dimming Contrast 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-programmable - allows AM-band avoidance and EMI reduction via dithering. |
| Fault Handling Mode | One-Out-All-Out - shuts down all channels upon single LED string fault, supporting ASIL B system compliance. |
| Thermal Resistance | RθJA = 37 °C/W (4-layer JEDEC PCB) - enables stable 11 W LED power delivery with standard thermal layout. |
| Operating Temperature | –40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and cabin-mounted automotive lighting. |
Pinout & Package
24-pin 4 mm × 4 mm QFN with wettable flank and exposed thermal pad - optimized for automotive PCB assembly and thermal dissipation in space-constrained lighting modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 13–16 (LED1–LED4) | LED current sink outputs | Cathode connections for up to four independent LED strings; each sinks up to 210 mA with <850 mV regulation voltage. |
| 20 (GATE) | N-channel MOSFET gate driver output | Drives external boost switch with 2 A peak current, 7 ns edge speed, and 100 ns min on/off time - enables high-efficiency SEPIC/boost topologies. |
| 22 (VIN) | Main power input | Accepts 4.5–40 V automotive supply; internal UVLO ensures safe start-up and brownout recovery down to 4 V. |
| 24 (VDD) | Internal LDO output | Regulated ~4.25 V bias rail; powers internal circuitry and requires 1 µF decoupling to AGND for stability. |
| 7 (PWM) | Brightness control input | Accepts 200 Hz–2 kHz PWM signal with 0.3 µs minimum on-time - enables flicker-free dimming without microcontroller overhead. |
| 23 (FAULT) | Open-drain fault status indicator | Pulled low during OVP, OTP, LED short/open, or input OCP - signals system controller to initiate safety shutdown or retry logic. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-Emptive Boost (PEB) control | Synchronizes boost switch turn-on with LED sink activation to suppress output voltage ripple and eliminate ceramic capacitor acoustic noise. |
| Programmable frequency dithering | Reduces EMI peaks by modulating switching frequency (1–22 kHz dither range) - simplifies automotive EMC filter design. |
| One-Out-All-Out fault response | Shuts down all LED channels upon detection of any single-string fault - satisfies ASIL B functional safety requirements for exterior lighting. |
| Integrated LED string detection | Automatically identifies unused LED pins (via 2.37 kΩ pull-down) during startup - prevents regulation errors and enables flexible channel configuration. |
| External clock synchronization | CLKOUT pin provides synchronized switching frequency and dither modulation - enables multi-converter phase alignment in complex lighting systems. |
Applications
| Automotive Exterior Lighting | Heads-Up Display (HUD) Backlight |
|---|---|
|
Use Scenario: High-brightness LED arrays for adaptive front-lighting systems (AFS) and dynamic turn signals requiring precise current matching and fast transient response. IC Role / Device Role / Timing Role: Primary LED current regulator with boost/SEPIC topology, managing four independent strings while maintaining <0.8% channel-to-channel current mismatch. Use Value: Enables consistent luminance across multiple LED zones under wide input voltage swings (4–40 V), critical for stop/start vehicle operation. |
Use Scenario: Compact, high-contrast backlight for augmented reality HUDs where optical clarity and minimal PWM-induced flicker are essential. IC Role / Device Role / Timing Role: Ultra-high-dimming-ratio LED driver using combined PWM + analog dimming to achieve >150,000:1 contrast without visible stepping. Use Value: Delivers smooth, imperceptible brightness transitions at low light levels - eliminating visual artifacts that degrade HUD readability. |
| Mid-Size LCD Instrument Cluster | Automotive Interior Ambient Lighting |
|
Use Scenario: Uniform backlighting for TFT-LCD instrument clusters with variable content brightness and temperature-stable color rendering. IC Role / Device Role / Timing Role: Four-channel current sink with ±0.7% accuracy and integrated soft-start - ensures glitch-free power-up and stable luminance across display zones. Use Value: Maintains consistent backlight intensity despite battery voltage fluctuations and ambient temperature changes (–40°C to +125°C). |
Use Scenario: RGB or white LED strips for mood lighting, door courtesy, and footwell illumination with programmable dimming profiles. IC Role / Device Role / Timing Role: Flexible dimming interface supporting both PWM (200 Hz–2 kHz) and analog (0.2–2 V DC or 40–1000 kHz APWM) inputs - simplifies MCU firmware integration. Use Value: Eliminates need for external DAC or PWM timers; enables seamless fade effects and low-noise operation without audible capacitor whine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862Q-7 | Single-channel, 1.5 A max output; no Pre-Emptive Boost; fixed 2.2 MHz switching; no One-Out-All-Out fault mode. | Targeted at simpler, lower-power interior lighting; lacks multi-string synchronization and ultra-high dimming ratio. | Select when only one high-current string is needed and ASIL B compliance is not required. |
| LM3409QMY/NOPB | Single-channel buck-boost LED controller; external MOSFETs required for both high-side and low-side; no integrated current sinks. | Requires additional external components for multi-string operation; higher BOM count and layout complexity. | Choose for custom topologies where flexibility outweighs integration benefits and dimming ratio >10,000:1 is not mandatory. |
Compared with AL8862Q-7 and LM3409QMY/NOPB, the A80604KESJSR-1 delivers superior integration (four matched current sinks + gate driver), automotive-grade fault handling (One-Out-All-Out), and industry-leading dimming performance (150,000:1), making it optimal for safety-critical, multi-zone exterior and HUD lighting.
Availability
A80604KESJSR-1 is available at Aetrix Electronics and suitable for automotive exterior lighting, heads-up display backlighting, and mid-size LCD instrument cluster applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for A80604KESJSR-1 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 and magnetic sensors for automotive and industrial markets.
The A80604KESJSR-1 belongs to Allegro's high-power LED driver product line, designed specifically for demanding automotive lighting applications requiring ultra-high dimming ratios, robust fault protection, and seamless integration into ASIL-compliant systems.
FAQ
What is the key functional difference between A80604KESJSR-1 and A80601KESJSR?
The A80604KESJSR-1 implements One-Out-All-Out fault handling, meaning any single LED string fault causes immediate shutdown of all four channels. In contrast, A80601KESJSR uses One-Out-Continue mode, allowing remaining functional strings to stay active. This distinction makes A80604KESJSR-1 suitable for ASIL B–compliant exterior lighting where full system deactivation is required upon partial failure. The A80604KESJSR-1 retains identical electrical specs, pinout, and thermal characteristics as the A80601KESJSR.
Does A80604KESJSR-1 support both boost and SEPIC topologies?
Yes, the A80604KESJSR-1 supports both boost and SEPIC configurations through its current-mode controller architecture and external N-channel MOSFET gate driver (GATE pin). The choice depends on whether output voltage must exceed input (boost) or handle input voltages both above and below output (SEPIC). Design examples in the datasheet confirm validated layouts for both topologies, with the same A80604KESJSR-1 IC controlling either configuration via external component selection.
How does Pre-Emptive Boost (PEB) improve performance in A80604KESJSR-1?
Pre-Emptive Boost (PEB) in the A80604KESJSR-1 reduces output voltage ripple by precisely timing the boost switch turn-on just before LED current sink activation. This minimizes the energy stored in output capacitors during off-periods, suppressing MLCC piezoelectric noise and enabling stable operation at ultra-low PWM duty cycles. As a result, the A80604KESJSR-1 achieves 15,000:1 contrast at 200 Hz without audible artifacts - a capability confirmed in functional testing and referenced in the A80604KESJSR-1 datasheet section "Pre-Emptive Boost (PEB)".
Can A80604KESJSR-1 drive more than 210 mA per channel?
Yes - the A80604KESJSR-1 allows paralleling of its four integrated current sinks to deliver up to 840 mA total LED current. This is achieved by connecting multiple LED1–LED4 pins together and configuring ISET accordingly. The datasheet explicitly states "Multiple sinks can be paralleled together to achieve higher LED currents up to 840 mA," and specifies that channel matching remains within ±0.8% even under paralleled operation, ensuring uniform brightness across high-current arrays.
What package type and thermal performance does A80604KESJSR-1 use?
The A80604KESJSR-1 uses a 24-pin 4 mm × 4 mm QFN with wettable flank and exposed thermal pad. Its thermal resistance is RθJA = 37 °C/W when mounted on a 4-layer JEDEC-standard PCB. This enables reliable operation at full 11 W LED power output within the –40°C to +125°C ambient range, as verified in Allegro's thermal characterization data. The wettable flank design supports automated optical inspection (AOI) for automotive-grade manufacturing traceability.
A80604KESJSR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-1 FAQ
1.How can I place an order for A80604KESJSR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for A80604KESJSR-1 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-1 reliable?
The price and inventory of A80604KESJSR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A80604KESJSR-1 is usually 5 days.
3.What payment methods are accepted for A80604KESJSR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A80604KESJSR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A80604KESJSR-1?
A80604KESJSR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A80604KESJSR-1 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-1?
For technical support, including A80604KESJSR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A80604KESJSR-1 requirements.
6.How does Aetrix verify that A80604KESJSR-1 is sourced from the original manufacturer or authorized distributors?
All A80604KESJSR-1 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-1 meets industry standards.
7.What is the process for return or replacement of A80604KESJSR-1?
All A80604KESJSR-1 units undergo pre-shipment inspection (PSI). If there is an issue with A80604KESJSR-1, 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-1 part is unused and in its original packaging.
Return procedure for A80604KESJSR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A80604KESJSR-1 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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