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Allegro MicroSystems A80605KESJSR
- Part No.:
- A80605KESJSR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
A80605KESJSR.pdf
- Description:
- WIDE INPUT VOLTAGE RANGE BOOST/S
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
A80605KESJSR from Allegro MicroSystems is a 6-channel automotive LED driver IC implementing a current-mode boost/SEPIC converter with external N-channel MOSFET gate driver, delivering up to 140 mA per channel and supporting 15,000:1 PWM dimming contrast ratio at 200 Hz for exterior lighting and HUD applications.
For engineers reviewing the A80605KESJSR datasheet, A80605KESJSR pinout, A80605KESJSR application, or A80605KESJSR equivalent, key selection considerations include its AEC-Q100 qualification, Pre-Emptive Boost control enabling ultra-low PWM on-time (0.3 µs), 4.5–40 V input range with cold-crank tolerance, 24-pin wettable-flank QFN package, and integrated fault handling for ASIL B systems.
Technical Context
The A80605KESJSR integrates six precision current sinks with ±0.7% accuracy and <2% matching, controlled via ISET resistor and ADIM analog/PWM inputs. Its Pre-Emptive Boost (PEB) algorithm synchronizes boost switching with LED sink activation to suppress output ripple and eliminate MLCC audible noise.
It supports externally synchronized or programmable switching frequency (260 kHz–2.3 MHz), dithering for EMI reduction, cycle-by-cycle current limiting, and comprehensive fault protection including open/shorted LED detection, overvoltage, overtemperature, and input overcurrent with optional P-channel disconnect switch control via GATE pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5–40 V startup; operates down to 4 V after startup-enables robust operation during automotive stop/start and cold-crank transients. |
| LED Current per Channel | Up to 140 mA with ±0.7% accuracy-supports high-brightness strings in mid-size LCD backlights and exterior lamps. |
| PWM Dimming Contrast Ratio | 15,000:1 at 200 Hz (PWM only); 150,000:1 (PWM + analog)-achieved via Pre-Emptive Boost and sub-microsecond 0.3 µs minimum on-time. |
| Switching Frequency Range | 260 kHz–2.3 MHz, sync-capable or resistor-programmed-allows AM-band avoidance and EMI optimization via dithering. |
| Fault Handling Mode | One-Out-Continue-maintains operation of remaining LED channels if one string fails open or shorted. |
| Package | 24-pin 4 mm × 4 mm QFN with wettable flank and exposed thermal pad-enables automated optical inspection and 37 °C/W thermal resistance on 4-layer PCB. |
| AEC-Q100 Grade | Qualified to Grade 1 (–40°C to +125°C ambient)-certified for under-hood and dashboard automotive environments. |
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 with ≥8 vias for reliable thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AGND | Analog ground reference | "Quiet" ground for LED current sinks and analog circuitry-must be separated from PGND to minimize noise coupling. |
| 2 COMP | Error amplifier output | Compensation node for boost loop stability-requires RC network to AGND for proper phase margin and transient response. |
| 3 ISET | LED current programming | Connect RISET resistor to AGND to set full-scale current (e.g., 8.33 kΩ = 120 µA → 140 mA/channel). |
| 7 EN/PWM | Enable and brightness control | High enables IC; PWM signal controls LED on/off timing-minimum 0.3 µs pulse width supported for ultra-high dimming ratio. |
| 8–13 LED6–LED1 | Current sink outputs | Cathode connections for up to six independent LED strings-unused pins require specific pull-down resistors (4.75 kΩ or 2.37 kΩ) for detection. |
| 15 OVP | Overvoltage sense input | Resistor divider from VOUT sets protection threshold (2.2–2.8 V typical)-also enables undervoltage detection at startup. |
| 17–19 VDRV, CS, GDRV | Boost gate drive interface | VDRV supplies gate driver (~6.5 V); CS senses MOSFET source current; GDRV drives external N-FET gate with 2 A peak drive capability. |
| 20 GATE | P-channel disconnect switch driver | Controls optional input PMOS for fault-isolation during output-to-ground shorts-sinks –113 µA, sources 6 mA. |
| 21 VSENSE | Input current sense input | Monitors VIN–VSENSE voltage drop across RSC to detect input overcurrent-trip point adjustable via RADJ (88–108 mV typical). |
| 22 VIN | Main power input | Supplies IC bias and boost converter input-UVLO thresholds: 4.45 V rise / 4.05 V fall with 400 mV hysteresis. |
| 23 FAULT | Open-drain fault indicator | Pulled low on any detected fault (LED short/open, OVP, OTP, etc.)-requires external pull-up; latched faults require EN/PWM low >16 ms or power cycle. |
| 24 VDD | Internal LDO output | ~4.25 V regulated supply for internal circuitry-requires 1 µF decoupling to AGND; UVLO: 3.2 V rise / 2.65 V fall. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-Emptive Boost (PEB) control | Synchronizes boost switch turn-on with LED sink activation to reduce output ripple and eliminate ceramic capacitor audible noise. |
| Programmable frequency dithering | Reduces EMI by spreading switching spectrum-dithering frequency (1–22 kHz) and range (±5% fSW) set via DITH and FSET pins. |
| One-Out-Continue fault handling | Continues driving remaining LED strings if one channel fails open or shorted-enhances system reliability in ASIL B lighting applications. |
| Ultra-low PWM on-time support | 0.3 µs minimum pulse width enables 15,000:1 contrast ratio at 200 Hz without blanking or distortion-critical for HUD and infotainment backlighting. |
| Integrated input disconnect gate driver | GATE pin drives external P-MOSFET to isolate input during output-to-ground short-prevents bus collapse and enables safe recovery. |
Applications
| Automotive Exterior Lighting | Automotive Heads-Up Display (HUD) |
|---|---|
Use Scenario: Adaptive front lighting systems (AFS) and dynamic turn signals requiring precise multi-zone brightness control and fast dimming response. IC Role / Device Role / Timing Role: Primary LED current regulator with boost/SEPIC topology, managing six independent strings for directional beam shaping and sequential animation. Use Value: One-Out-Continue fault handling ensures partial functionality during single-string failure; 4.5–40 V operation withstands load dump and cold crank without external protection. | Use Scenario: Projection-based HUD units where LED backlight brightness must scale dynamically with ambient light while maintaining color fidelity and zero flicker. IC Role / Device Role / Timing Role: High-accuracy current sink controller with Pre-Emptive Boost to eliminate output ripple-induced image shimmer and MLCC acoustic noise. Use Value: 15,000:1 PWM dimming ratio at 200 Hz enables seamless luminance transitions across daylight-to-night conditions without visible steps. |
| Infotainment LCD Backlighting | Automotive Interior Ambient Lighting |
Use Scenario: Mid-size center-stack displays (7–12 inch) requiring uniform edge-lit or direct-lit backlighting with local dimming zones. IC Role / Device Role / Timing Role: Multi-string LED driver with programmable dimming modes (APWM + analog) and soft-start ramp to prevent inrush current surges during display wake-up. Use Value: Six 140 mA sinks support parallel string configurations up to 840 mA total-enables high-luminance panels while maintaining thermal headroom in confined spaces. | Use Scenario: RGBW ambient lighting modules in door panels, footwells, and dashboards requiring smooth color mixing and fade effects. IC Role / Device Role / Timing Role: Precision current source for individual monochrome LED strings, with independent PWM/ADIM control per channel for hue and saturation tuning. Use Value: Sub-µs PWM timing resolution and <2% channel-to-channel matching ensure consistent brightness across mixed-color arrays without visible banding or pulsing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8863T-7TR | 4-channel, 120 mA/channel; no Pre-Emptive Boost; fixed 2.2 MHz switching; lacks One-Out-Continue fault mode. | Targeted at cost-sensitive interior lighting-not qualified for ASIL B or exterior use. | Select when lower channel count and simplified fault behavior suffice; verify thermal derating for 840 mA total load. |
| LM3409QMY/NOPB | Single-channel buck-boost LED controller; requires external current sense and gate drivers; no integrated sinks or ADIM interface. | Used in flexible, discrete high-power designs-lacks multi-string integration and automotive qualification. | Choose for custom topologies requiring >1 A per string or non-standard dimming schemes; adds design complexity and BOM count. |
Compared with AL8863T-7TR and LM3409QMY/NOPB, the A80605KESJSR delivers higher integration (6 sinks + gate drivers), certified ASIL B readiness, and patented PEB for ultra-low-noise dimming-making it uniquely suited for safety-critical, high-fidelity automotive lighting where reliability and visual quality are non-negotiable.
Availability
A80605KESJSR is available at Aetrix Electronics and suitable for automotive exterior lighting, heads-up display backlighting, and infotainment LCD backlighting requiring stable component supply across extended production lifecycles.
Supply support for A80605KESJSR 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 A80605KESJSR belongs to Allegro's automotive LED driver product line, designed specifically to meet AEC-Q100 Grade 1 requirements and deliver ultra-high dimming ratios with minimal EMI in space-constrained lighting modules.
FAQ
What is the minimum PWM on-time supported by the A80605KESJSR?
The A80605KESJSR supports a minimum PWM on-time of 0.3 µs, enabled by its Pre-Emptive Boost architecture and high-speed gate drivers. This specification allows the A80605KESJSR to achieve a 15,000:1 dimming contrast ratio at 200 Hz-critical for HUD and adaptive lighting where fine luminance gradation is required without visible stepping or flicker.
How does the A80605KESJSR handle a single LED string failure?
The A80605KESJSR implements One-Out-Continue fault handling: if one LED string opens or shorts, the remaining five channels continue operating normally. This behavior is confirmed in the Selection Guide for A80605KESJSR and distinguishes it from the A80605KESJSR-1 variant, which uses One-Out-All-Out. The A80605KESJSR maintains partial illumination for functional safety compliance in ASIL B systems.
Can the A80605KESJSR operate below 4.5 V input?
Yes-the A80605KESJSR starts up only when VIN exceeds 4.45 V (UVLO rise threshold), but once operational, it continues functioning down to 4.0 V. This extended dropout capability allows the A80605KESJSR to remain active during automotive cold-crank events and battery sag, ensuring uninterrupted lighting in critical driving conditions without external brownout circuitry.
What package type and thermal performance does the A80605KESJSR use?
The A80605KESJSR uses a 24-pin 4 mm × 4 mm QFN with wettable flank and exposed thermal pad (ES package). Its thermal resistance is specified as RθJA = 37 °C/W on a JEDEC-standard 4-layer PCB. The wettable flank enables solder joint inspection, and the thermal pad must be connected to the PCB ground plane using at least eight vias to maintain junction temperature within the 150 °C maximum limit.
Does the A80605KESJSR support both PWM and analog dimming simultaneously?
Yes-the A80605KESJSR supports combined PWM and analog dimming to achieve up to 150,000:1 contrast ratio. Analog dimming is applied via the ADIM pin (DC voltage or 40–1000 kHz clock), while PWM is applied to the EN/PWM pin. The A80605KESJSR internally blends these signals, allowing designers to use analog control for coarse adjustment and PWM for fine-grained modulation-maximizing dynamic range without compromising response speed.
A80605KESJSR 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:
- 6
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 140mA
- 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)
A80605KESJSR FAQ
1.How can I place an order for A80605KESJSR through Aetrix?
Please submit a Request for Quotation (RFQ) for A80605KESJSR 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 A80605KESJSR reliable?
The price and inventory of A80605KESJSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A80605KESJSR is usually 5 days.
3.What payment methods are accepted for A80605KESJSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A80605KESJSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A80605KESJSR?
A80605KESJSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A80605KESJSR 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 A80605KESJSR?
For technical support, including A80605KESJSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A80605KESJSR requirements.
6.How does Aetrix verify that A80605KESJSR is sourced from the original manufacturer or authorized distributors?
All A80605KESJSR 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 A80605KESJSR meets industry standards.
7.What is the process for return or replacement of A80605KESJSR?
All A80605KESJSR units undergo pre-shipment inspection (PSI). If there is an issue with A80605KESJSR, 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 A80605KESJSR part is unused and in its original packaging.
Return procedure for A80605KESJSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A80605KESJSR Tags
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