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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Allegro MicroSystems APM80904KNBATR

Name: APM80904KNBATR
Brand: Allegro MicroSystems
SKU: APM80904KNBATR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APM80904KNBATR

Manufacturer:: Allegro MicroSystems

Category:: LED Drivers

Package:: 32-PowerFQFN

Datasheet:: APM80904KNBATR.pdf

Description:: 42V, 2A LEDBUCK DRIVER MODULE W/

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Product details

Overview

APM80904KNBATR from Allegro MicroSystems is an automotive-grade, synchronous buck LED driver module integrating high-side/low-side N-channel MOSFETs (80 mΩ / 60 mΩ), power inductor, VIN and boot capacitors, and a 5 V / 14 mA LDO. It delivers up to 1.5 A constant current with ±3% high-side current sense accuracy, operates from 4.5–36 V input, and supports PWM, analog, and programmable internal dimming for daytime running lights and fog lamps.

For engineers reviewing the APM80904KNBATR datasheet, APM80904KNBATR pinout, APM80904KNBATR application, or APM80904KNBATR equivalent, this page provides verified technical context on its 2 MHz ultra-low-EMI fixed-on-time regulation, thermal foldback via ADIM/NTC, fault-flag reporting (FFn), and QFN-32 wettable-flank package - all critical for AEC-Q100-compliant automotive lighting design.

Technical Context

The APM80904KNBATR uses true average current mode control with cycle-by-cycle controlled on-time to maintain precise LED current regulation across input and output voltage variations. Its fixed-on-time architecture dynamically adjusts switching frequency around 2 MHz while incorporating ±5% spread spectrum modulation at 11.5 kHz to suppress EMI peaks per CISPR25 Class 5.

It implements robust fault protection including LED open/short detection (with FDSET-configurable masking), thermal shutdown (150–180 °C), undervoltage lockout (4.31 V with 100–300 mV hysteresis), and adjacent-pin short tolerance. Dimming is supported via three independent paths: external PWM on EN or PWM pins, programmable internal PWM (via FPWM/DR), and analog dimming (ADIM) with linear calibration and thermal foldback capability.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 36 V (with 40 V transient tolerance); enables direct battery connection in 12 V/24 V automotive systems without pre-regulation.
Output Current	200 mA to 1.5 A (user-selectable via external R_SENSE and RNG pin); supports both high-brightness DRLs and low-power map lights.
Switching Frequency	≈2 MHz (fixed-on-time with spread spectrum ±5%); minimizes EMI and allows compact passive filtering per CISPR25 Class 5 compliance.
Current Sense Accuracy	±3% (high-side sensing); ensures stable LED brightness across temperature and line/load variations without external calibration.
Integrated LDO	5.0 V ±2.5%, 14 mA output (VVCC = 4.85–5.15 V); powers external bias circuits or microcontrollers without adding discrete regulators.
Thermal Protection	150 °C shutdown with 25 °C hysteresis (T_SD = 150–180 °C); prevents thermal runaway during high-duty-cycle operation in enclosed lamp housings.
Dimming Interfaces	PWM (EN/PWM pins), internal PWM (FPWM/DR), and analog (ADIM); enables flexible integration with legacy controllers, MCU-driven systems, or thermal management circuits.

Pinout & Package

APM80904KNBATR is housed in a thermally enhanced 4 mm × 6 mm × 2.1 mm QFN-32 package with wettable flanks (suffix NB), featuring three exposed thermal pads (PAD0: PGND, PAD1: VIN, PAD2: VOUT) for optimal PCB heat dissipation and solder joint inspection.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pins 5,6)	Power input supply for buck stage	Accepts 4.5–36 V; connects to integrated input capacitor and high-side switch source; requires low-impedance path to PAD1 (VIN).
VOUT (Pins 1,2,3,30,31,32)	LED string output node	Sources regulated current to LED load; connects to integrated inductor and PAD2 (VOUT); multiple pins reduce current density and thermal stress.
PGND (Pins 8,9)	Power ground return	High-current return path for buck switches and inductor; must be connected to large copper plane and PAD0 (PGND) for low-impedance thermal path.
CSH / CSL (Pins 22,21)	Differential current sense inputs	Measure voltage across external R_SENSE; high-side sensing enables accurate regulation even when VOUT approaches VIN; ±3% accuracy over –40°C to 125°C.
EN (Pin 10)	Enable and PWM dimming input	Logic-high (>1.8 V) enables IC; can accept external PWM signal for "chopped battery" dimming when PWM pin is held high.
PWM (Pin 12)	Dedicated PWM dimming input	Direct logic-controlled dimming: Low = LED OFF, High + EN High = LED ON; supports 100 Hz–2 kHz dimming frequencies with <5 µs minimum on-time.
ADIM (Pin 14)	Analog dimming and thermal foldback input	0.6–1.3 V (RNG=High) or 0.6–0.85 V (RNG=Low) linearly scales LED current reference; interfaces with NTC thermistors for automatic thermal derating.
FFn (Pin 15)	Open-drain fault flag output	Pulled low on LED open/short, thermal shutdown, or UVLO; requires external pull-up; includes deglitch (30–65 µs) and mask timers (70–130 µs) to reject false triggers.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for –40°C to +125°C ambient operation with full electrical characterization; meets automotive reliability and stress testing requirements.
Integrated power stage	Combines 80 mΩ HS / 60 mΩ LS MOSFETs, inductor, and VIN/boot capacitors in one QFN-32 package - eliminates 12+ external components and reduces board area by >40%.
Ultra-low EMI architecture	2 MHz switching + spread spectrum + integrated input capacitor minimizes high-frequency radiated emissions; passes CISPR25 Class 5 without additional shielding or ferrites.
Triple dimming modes	External PWM (EN/PWM), internal PWM (FPWM/DR), and analog (ADIM) provide system-level flexibility - e.g., MCU-driven PWM + NTC-based thermal foldback in same design.
Robust fault protection	Detects LED open/short, thermal overload, UVLO, and pin shorts; includes configurable fault masking (FDSET) and latched FFn reporting for diagnostic logging in vehicle networks.

Applications

Daytime Running Lights (DRL)	Front/Rear Fog Lights
Use Scenario: Continuous 100% duty-cycle illumination during daylight hours in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Constant-current buck regulator maintaining 700–1500 mA through 2–4 white LED strings with dynamic VIN compensation (9–16 V battery range). Use Value: Delivers stable luminance despite engine cranking dips or alternator ripple; integrated LDO powers CAN transceiver for adaptive DRL control signals.	Use Scenario: High-intensity, wide-beam illumination activated in low-visibility conditions (fog, rain, snow) with rapid thermal cycling. IC Role / Device Role / Timing Role: Thermally managed LED driver using ADIM/NTC feedback to reduce current above 85°C, preventing lens yellowing and LED degradation. Use Value: Enables 1.5 A peak output with automatic foldback - extends LED lifetime by >30% vs. fixed-current designs under sustained thermal stress.
Turn/Stop Lights	Dimmable Interior Lighting
Use Scenario: Fast-switching brake/tail light modules requiring synchronized PWM dimming and fault-safe fail-dead functionality. IC Role / Device Role / Timing Role: Dual-mode dimming controller: EN pin accepts vehicle bus PWM (100–500 Hz) while FFn flag reports open-circuit faults to body control module (BCM). Use Value: Eliminates need for external fault translators; 10 µs FFn rise/fall times enable real-time diagnostics compatible with LIN/CAN-based lighting networks.	Use Scenario: User-adjustable cabin lighting (map, puddle, footwell) with smooth 1000:1 dimming range and zero-flicker performance. IC Role / Device Role / Timing Role: Hybrid dimming IC combining internal 200 Hz PWM (FPWM/DR) with analog ADIM fine-tuning for seamless brightness transitions below 1% duty cycle. Use Value: Achieves flicker-free dimming down to 0.1% (5 µs on-time) without audible coil whine - critical for premium vehicle interior experience.

Daytime Running Lights (DRL)

Front/Rear Fog Lights

Use Scenario: Continuous 100% duty-cycle illumination during daylight hours in passenger vehicles and commercial trucks.

IC Role / Device Role / Timing Role: Constant-current buck regulator maintaining 700–1500 mA through 2–4 white LED strings with dynamic VIN compensation (9–16 V battery range).

Use Value: Delivers stable luminance despite engine cranking dips or alternator ripple; integrated LDO powers CAN transceiver for adaptive DRL control signals.

Use Scenario: High-intensity, wide-beam illumination activated in low-visibility conditions (fog, rain, snow) with rapid thermal cycling.

IC Role / Device Role / Timing Role: Thermally managed LED driver using ADIM/NTC feedback to reduce current above 85°C, preventing lens yellowing and LED degradation.

Use Value: Enables 1.5 A peak output with automatic foldback - extends LED lifetime by >30% vs. fixed-current designs under sustained thermal stress.

Turn/Stop Lights

Dimmable Interior Lighting

Use Scenario: Fast-switching brake/tail light modules requiring synchronized PWM dimming and fault-safe fail-dead functionality.

IC Role / Device Role / Timing Role: Dual-mode dimming controller: EN pin accepts vehicle bus PWM (100–500 Hz) while FFn flag reports open-circuit faults to body control module (BCM).

Use Value: Eliminates need for external fault translators; 10 µs FFn rise/fall times enable real-time diagnostics compatible with LIN/CAN-based lighting networks.

Use Scenario: User-adjustable cabin lighting (map, puddle, footwell) with smooth 1000:1 dimming range and zero-flicker performance.

IC Role / Device Role / Timing Role: Hybrid dimming IC combining internal 200 Hz PWM (FPWM/DR) with analog ADIM fine-tuning for seamless brightness transitions below 1% duty cycle.

Use Value: Achieves flicker-free dimming down to 0.1% (5 µs on-time) without audible coil whine - critical for premium vehicle interior experience.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4425AGU-AEC1-P	40 V input, 1.2 A output, external inductor required; no integrated LDO or ADIM interface; 2.2 MHz fixed frequency without spread spectrum.	Lacks analog dimming and thermal foldback; requires external 5 V rail; suitable only for basic on/off or PWM-only lighting where thermal management is handled externally.	Select when cost sensitivity outweighs need for integrated thermal protection and analog control; verify EMC compliance separately due to missing spread spectrum.
LM3409QMYX/NOPB	40 V input, 1.5 A, external MOSFETs and inductor; no integrated power stage or LDO; analog dimming only (no PWM or internal dimming).	Requires full external power stage layout; no fault flag or built-in diagnostics; limited to analog-dimming-only systems without digital control interfaces.	Choose only for highly customized thermal/mechanical layouts where discrete component selection is mandatory; adds ≥8 BOM items and increases layout complexity.

Compared with MPQ4425AGU-AEC1-P and LM3409QMYX/NOPB, the APM80904KNBATR reduces total solution size by 65%, eliminates external LDO and current-sense amplifier, and uniquely integrates triple dimming modes with fault-aware diagnostics - making it optimal for space-constrained, thermally demanding automotive lighting modules.

Availability

APM80904KNBATR is available at Aetrix Electronics and suitable for daytime running lights, fog lights, and turn/stop lighting systems requiring stable component supply, AEC-Q100 compliance, and production-ready thermal management.

Supply support for APM80904KNBATR 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 magnetic sensing, power ICs, and motor driver solutions for automotive and industrial markets.

The APM80904KNBATR belongs to Allegro's automotive LED driver product line, engineered specifically for AEC-Q100-compliant exterior lighting applications demanding ultra-low EMI, integrated thermal protection, and multi-mode dimming in compact form factors.

FAQ

What is the maximum continuous output current of the APM80904KNBATR?

The APM80904KNBATR supports up to 1.5 A continuous LED current when configured with RNG = High and adequate thermal management (e.g., 4-layer PCB with thermal vias to PGND/VIN/VOUT pads). At 1 A output, typical efficiency is 89% (12 V input) or 82% (24 V input), and thermal shutdown activates at junction temperatures exceeding 150–180 °C.

How does the APM80904KNBATR achieve CISPR25 Class 5 compliance?

The APM80904KNBATR achieves CISPR25 Class 5 compliance through three integrated features: 2 MHz fixed-on-time switching (reducing fundamental harmonics), ±5% spread spectrum modulation at 11.5 kHz (smearing spectral peaks), and on-chip VIN and boot capacitors (minimizing high-di/dt loop area). No external EMI filters are required in standard test configurations.

Can the APM80904KNBATR operate with a 36 V input and 2.5 V LED string voltage?

Yes, the APM80904KNBATR supports 4.5–36 V input and regulates down to VOUT ≥ 2.65 V (minimum common-mode voltage at CSL pin). At 36 V input and 2.5 V output, the duty cycle drops below 16%, causing automatic tOFF extension and reduced switching frequency - but current regulation remains accurate as long as VOUT ≥ 2.65 V.

What is the function of the FDSET pin on the APM80904KNBATR?

The FDSET pin sets the LED open fault detection threshold by connecting a voltage divider between VIN and SGND. When FDSET voltage falls below the internal 2.4 V reference (e.g., during low-VIN cranking), LED open fault detection is masked to prevent false triggering. This ensures reliable operation during cold-start conditions without disabling fault reporting under normal operation.

Does the APM80904KNBATR support thermal foldback using an NTC thermistor?

Yes, the APM80904KNBATR supports thermal foldback via the ADIM pin. An external NTC thermistor network (e.g., NTC + resistors R1/Rp/Rs) generates a voltage that decreases with rising temperature. As ADIM voltage drops within its linear range (0.6–1.3 V for RNG=High), the LED current reference (VCSREG) scales linearly - reducing drive current to limit thermal stress on LEDs and optics.

APM80904KNBATR Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 32-PowerFQFN

Packaging:: Bulk

Product Status:: Discontinued at Digi-Key

Type:: DC DC Regulator

Topology:: Step-Down (Buck)

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 36V

Voltage - Output:: 2.65V ~ 25V

Current - Output / Channel:: 1.5A

Frequency:: 2MHz

Dimming:: Analog, PWM

Applications:: General Purpose

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 32-QFN (4x6)

APM80904KNBATR FAQ

1.How can I place an order for APM80904KNBATR through Aetrix?

Please submit a Request for Quotation (RFQ) for APM80904KNBATR 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 APM80904KNBATR reliable?

The price and inventory of APM80904KNBATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APM80904KNBATR is usually 5 days.

3.What payment methods are accepted for APM80904KNBATR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APM80904KNBATR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APM80904KNBATR?

APM80904KNBATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APM80904KNBATR 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 APM80904KNBATR?

For technical support, including APM80904KNBATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APM80904KNBATR requirements.

6.How does Aetrix verify that APM80904KNBATR is sourced from the original manufacturer or authorized distributors?

All APM80904KNBATR 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 APM80904KNBATR meets industry standards.

7.What is the process for return or replacement of APM80904KNBATR?

All APM80904KNBATR units undergo pre-shipment inspection (PSI). If there is an issue with APM80904KNBATR, 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 APM80904KNBATR part is unused and in its original packaging.

Return procedure for APM80904KNBATR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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