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Allegro MicroSystems ALT80800KLPATR
- Part No.:
- ALT80800KLPATR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ALT80800KLPATR.pdf
- Description:
- IC LED DRV RGLTR PWM 2A 16ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:57,769
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Product details
Overview
ALT80800KLPATR from Allegro MicroSystems is an AEC-Q100-qualified synchronous buck LED driver IC delivering constant-current output up to 2.0 A for automotive lighting. It integrates high-side (200 mΩ) and low-side (150 mΩ) N-channel DMOS switches, supports 4.5–55 V input, and achieves true average current regulation via cycle-by-cycle controlled on-time. Used in daytime running lights and fog lamps.
For engineers reviewing the ALT80800KLPATR datasheet, ALT80800KLPATR pinout, ALT80800KLPATR application, or ALT80800KLPATR equivalent, key selection considerations include its integrated MOSFETs, PWM/EN dual-dimming capability, analog dimming (ADIM) for thermal foldback, fault flag (FFn) behavior, and 16-pin eTSSOP-LP thermal pad package.
Technical Context
The ALT80800KLPATR implements fixed adaptive on-time control with external TON resistor programming (e.g., 42.2 kΩ sets ~250 ns on-time), enabling switching frequencies from 200 kHz to 1 MHz. Its differential current sense amplifier regulates VCSH–VCSL to 200 mV typical, independent of ripple, ensuring stable LED current across varying VOUT.
Fault handling includes LED open/short detection with configurable masking via FDSET voltage threshold and ADIM pin level (264 mV reference), plus active-low FFn output with deglitch (50 µs typ) and retry (1 ms) timers. Thermal shutdown triggers at 165°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 55 V - supports full automotive battery range including cold-crank (4.5 V) and load-dump (55 V) transients. |
| Max Output Current | 2.0 A continuous - guaranteed over –40°C to +125°C junction temperature, with internal current limit at 3.25 A typical. |
| Integrated Switches | HS RDSON = 0.2 Ω / LS RDSON = 0.15 Ω - reduces external component count and conduction losses in high-current LED strings. |
| Current Sense Accuracy | VCSREG = 200 mV ±3 mV - enables precise LED current setting via RSENSE = 0.2 V / iLED, with fine-tuning support via Radj. |
| Dimming Support | PWM dimming down to 0.1% at 200 Hz - achieved by applying PWM to EN (with PWM pin high) or directly to PWM pin (with EN enabled). |
| Thermal Resistance | RθJP = 2°C/W - exposed thermal pad enables efficient heat transfer to PCB ground plane, critical for 2 A operation in confined automotive enclosures. |
| Protection Features | UVLO (4.3 V turn-on), thermal shutdown (165°C), cycle-by-cycle current limit, LED open/short fault detection with maskable logic - ensures robust operation in harsh automotive environments. |
Pinout & Package
ALT80800KLPATR is housed in a 16-pin eTSSOP package (suffix LP) with an exposed thermal pad connected to PGND for enhanced thermal dissipation. The package meets JEDEC standards and achieves RθJA = 34°C/W on a 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 PGND | Power ground return path for high-current switch node | Must be connected to large copper pour under exposed pad; separates power and signal ground paths. |
| 3 VIN | Main power input for buck converter stage | Accepts 4.5–55 V; supplies high-side gate driver and internal LDO bias when VCCIN tied to VIN. |
| 4 EN | Enable and legacy PWM dimming input | Active-high logic input; when high and PWM = high, enables LED current; when pulsed low while PWM = high, enables chopped battery dimming. |
| 5 PWM | Dedicated PWM dimming control input | Logic input with internal 100 kΩ pull-up; low = LED off, high = LED on (when EN enabled); supports 100 Hz–2 kHz dimming frequency. |
| 7 ADIM | Analog dimming and thermal foldback control | 0.4–2.1 V input linearly scales LED current from 20% to 100%; used with NTC thermistor for temperature-dependent current reduction. |
| 9 CSH / 10 CSL | Differential current sense inputs | Measure voltage across external RSENSE; regulate VCSH–VCSL to 200 mV to set iLED = 0.2 V / RSENSE. |
| 12 VCC | 5.0 V / 14 mA regulated output | Internal LDO output; powers internal circuitry and can supply external bias (e.g., NTC divider, logic buffers) up to 14 mA. |
| 13 FFn | Open-drain fault flag output | Pulled low during LED open/short, overtemperature, or UVLO faults; requires external pull-up resistor to logic rail. |
| 15 BOOT | High-side gate driver bootstrap supply | Requires 0.47 µF ceramic capacitor to SW; enables floating gate drive for N-channel high-side MOSFET. |
| 16 SW | Switch node output | Connects to inductor; carries full buck switching waveform (0 V to VIN); must be routed with minimal loop area for EMI control. |
| PAD | Exposed thermal pad | Electrically and thermally connected to PGND; mandatory for thermal performance and reliability at 2 A load. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full automotive reliability testing (HTOL, TC, UHAST). |
| True average current regulation | Eliminates LED brightness variation caused by current ripple; maintains constant luminous output regardless of switching frequency or inductor DCR. |
| Dual-dimming interface | Supports both PWM pin (direct) and EN pin (legacy) dimming without external logic; enables backward compatibility with existing vehicle control modules. |
| Configurable LED open fault masking | FDSET pin voltage threshold allows disabling open-circuit detection during low-VIN conditions (e.g., cranking), preventing false fault asserts. |
| Switching frequency dithering | ±5% modulation at 12.5 kHz spreads EMI energy across spectrum, easing compliance with CISPR 25 Class 5 automotive EMC requirements. |
| Robust fault tolerance | Detects adjacent pin shorts, pin-to-ground faults, and component opens/shorts - enhances system-level safety and diagnostic coverage per ISO 26262 ASIL-B readiness. |
Applications
| Daytime Running Lights (DRL) | Front Fog Lights |
|---|---|
Use Scenario: Continuous 100% brightness operation during daylight hours, powered from vehicle battery with wide input voltage swing (9–16 V). IC Role / Device Role / Timing Role: Constant-current buck regulator maintaining stable 1.5 A through 4× white LEDs in series, dynamically adjusting VOUT from 12 V to 14.4 V as battery voltage changes. Use Value: Eliminates brightness drift across battery voltage range; integrated MOSFETs reduce BOM count vs. controller-only solutions; AEC-Q100 ensures 15-year field life. | Use Scenario: High-intensity illumination in low-visibility conditions, requiring rapid thermal response and fault resilience during repeated on/off cycling. IC Role / Device Role / Timing Role: Synchronous buck driver delivering 2.0 A peak current to 6× amber LEDs, using ADIM pin with NTC thermistor to reduce current above 85°C. Use Value: Prevents LED thermal runaway and color shift; FFn fault flag enables ECU-level diagnostics; dithered switching minimizes conducted EMI into adjacent radar sensors. |
| Rear Turn/Stop Lights | Dimmable Interior Map Light |
Use Scenario: Dual-mode operation: 0.2 A steady-state for tail light, 2.0 A pulsed for brake light, with strict timing compliance (< 250 ms rise/fall per SAE J1399). IC Role / Device Role / Timing Role: PWM-dimmable driver accepting 200 Hz–2 kHz signals on EN pin; fast startup delay (< 150 µs) ensures immediate LED response during brake activation. Use Value: Meets regulatory rise/fall time requirements without external timing components; cycle-by-cycle current limit prevents inrush damage during stop-light pulses. | Use Scenario: User-adjustable cabin lighting with smooth 10:1 analog dimming and 1000:1 combined PWM+ADIM range, operating from 12 V nominal supply. IC Role / Device Role / Timing Role: Analog dimming via ADIM pin (0.4–2.1 V) calibrated to match human eye sensitivity; PWM pin used for discrete brightness steps. Use Value: Enables seamless brightness transitions without visible flicker; internal 5 V LDO powers touch-sensor interface; low 1 µA shutdown current preserves battery during long idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current synchronous buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4425AGU-A | Non-AEC-Q100; 1.2 A max output; no integrated ADIM analog dimming; requires external compensation. | Suitable for non-automotive industrial lighting; lacks thermal foldback and fault masking features. | Select only for cost-sensitive non-automotive designs where AEC-Q100 and 2 A output are not required. |
| LM3409QMYX/NOPB | AEC-Q100 qualified; 1.5 A max; external high-side N-MOSFET required; no integrated LDO or FFn fault flag. | Used in legacy automotive headlamp modules with discrete MOSFET layout; higher board space and thermal design complexity. | Choose when board layout allows discrete high-side switch or when existing LM3409-based designs require drop-in upgrade with same footprint constraints. |
Compared with MPQ4425AGU-A and LM3409QMYX/NOPB, ALT80800KLPATR provides higher 2.0 A output, integrated analog dimming with thermal foldback, and a dedicated fault flag - making it uniquely suited for next-generation AEC-Q100-compliant automotive exterior lighting where reliability, integration, and diagnostic capability are critical.
Availability
ALT80800KLPATR is available at Aetrix Electronics and suitable for automotive lighting, daytime running lights, and fog lamp applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for ALT80800KLPATR 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 ALT80800 product line delivers AEC-Q100-qualified, high-current synchronous buck LED drivers optimized for automotive exterior lighting systems requiring robust fault handling, thermal management, and multi-mode dimming.
FAQ
What is the maximum LED string voltage supported by ALT80800KLPATR?
The ALT80800KLPATR supports output voltages up to approximately 90% of VIN depending on switching frequency and minimum off-time (tOFFmin = 100 ns). At VIN = 18 V and fSW = 1 MHz, VOUT(max) ≈ 16.2 V - sufficient for five 3.3 V white LEDs in series. Minimum VOUT is limited to 2.65 V for guaranteed current accuracy, below which regulation continues but precision degrades.
How does the ALT80800KLPATR implement thermal foldback protection?
The ALT80800KLPATR uses the ADIM pin to enable thermal foldback by connecting an external NTC thermistor divider. As temperature rises, NTC resistance drops, reducing ADIM voltage linearly from 2.1 V (100% current) to 0.4 V (20% current). This automatically scales LED current downward to prevent thermal runaway, with foldback threshold set by resistor ratios - no microcontroller required.
Can ALT80800KLPATR operate with input voltage below 4.5 V?
No - the ALT80800KLPATR has a hard undervoltage lockout (UVLO) threshold of 4.3 V (typical turn-on) with 100–300 mV hysteresis. Below 4.5 V, the device remains disabled and draws only 1 µA shutdown current. It is not designed for start-stop or ultra-low-voltage battery scenarios; operation below UVLO is undefined and may cause erratic behavior or failure to regulate.
What is the purpose of the FDSET pin on ALT80800KLPATR?
The FDSET pin on ALT80800KLPATR configures LED open-fault detection masking during low-input-voltage conditions. When FDSET voltage falls below the internal 2.4 V reference (e.g., during engine cranking), open-circuit fault detection is disabled to prevent false FFn assertions. This ensures reliable operation across the full automotive battery range without compromising fault coverage during normal operation.
Does ALT80800KLPATR require external compensation components?
No - the ALT80800KLPATR features internal control loop compensation, eliminating the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces BOM count, and improves consistency across production units. Stability is guaranteed across all valid operating conditions (4.5–55 V VIN, 0.2–2.0 A iLED) without user adjustment.
ALT80800KLPATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 55V
- Voltage - Output:
- 50V
- Current - Output / Channel:
- 2A
- Frequency:
- 500kHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
ALT80800KLPATR FAQ
1.How can I place an order for ALT80800KLPATR through Aetrix?
Please submit a Request for Quotation (RFQ) for ALT80800KLPATR 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 ALT80800KLPATR reliable?
The price and inventory of ALT80800KLPATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALT80800KLPATR is usually 5 days.
3.What payment methods are accepted for ALT80800KLPATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALT80800KLPATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALT80800KLPATR?
ALT80800KLPATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALT80800KLPATR 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 ALT80800KLPATR?
For technical support, including ALT80800KLPATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALT80800KLPATR requirements.
6.How does Aetrix verify that ALT80800KLPATR is sourced from the original manufacturer or authorized distributors?
All ALT80800KLPATR 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 ALT80800KLPATR meets industry standards.
7.What is the process for return or replacement of ALT80800KLPATR?
All ALT80800KLPATR units undergo pre-shipment inspection (PSI). If there is an issue with ALT80800KLPATR, 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 ALT80800KLPATR part is unused and in its original packaging.
Return procedure for ALT80800KLPATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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