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Allegro MicroSystems APM80900KNBATR
- Part No.:
- APM80900KNBATR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 32-PowerFQFN
- Datasheet:
-
APM80900KNBATR.pdf
- Description:
- 42V, 2A LEDBUCK DRIVER MODULE
- Quantity:
- Payment:
- Shipping:
Inventory:1,535
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Product details
Overview
APM80900KNBATR from Allegro MicroSystems is an automotive-grade, synchronous buck LED driver module integrating high-side/low-side N-channel MOSFETs (80 mΩ / 60 mΩ), 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 or analog dimming for daytime running lights and fog lamps.
For engineers reviewing the APM80900KNBATR datasheet, APM80900KNBATR pinout, APM80900KNBATR application, or APM80900KNBATR 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-driven open/short LED detection, and QFN-32 wettable-flank package layout considerations.
Technical Context
The APM80900KNBATR uses true average current mode control with cycle-by-cycle on-time regulation to maintain precise LED current across input and output voltage variations. Its integrated synchronous buck architecture eliminates external diode losses and enables >90% efficiency at 1 A with minimal deadtime and internal boot charging.
It implements spread-spectrum switching (±5% frequency sweep at 11.5 kHz modulation) and integrates EMI-reducing features including on-chip VIN-to-PGND capacitance and optimized power loop layout. Fault protection includes latched open/short LED detection with programmable mask timing (tMASK = 100 µs), hiccup-mode recovery, and robust pin-to-pin short tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports full automotive battery range including cold-crank (4.5 V) and load-dump transients (up to 40 V absolute max). |
| Max Output Current | 1.5 A - programmable via external RSENSE; accuracy ±3% using high-side current sensing. |
| Switching Frequency | ~2 MHz - fixed on-time operation with spread-spectrum modulation to reduce peak EMI emissions per CISPR25 Class 5. |
| Integrated Power Stage | HS/LS N-MOSFETs (80 mΩ / 60 mΩ typ) - eliminates external switch selection and gate drive design effort. |
| Thermal Protection | 150°C shutdown with 25°C hysteresis - ensures safe operation under sustained high-power LED loads. |
| LDO Output | 5.0 V ±2.5%, 14 mA - powers external bias circuitry without requiring separate regulator. |
| Dimming Interface | PWM pin (100 Hz–2 kHz) + EN pin dimming + ADIM analog input - enables flexible brightness control and thermal foldback calibration. |
Pinout & Package
APM80900KNBATR is housed in a thermally enhanced 32-pin QFN package measuring 4 mm × 6 mm × 2.1 mm with wettable flanks for automated optical inspection (AOI) and improved solder joint reliability. The exposed thermal pad (PAD0–PAD2) connects to VIN, PGND, and VOUT planes respectively to maximize heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 5,6) | Power input supply | Accepts 4.5–36 V; internal UVLO triggers at 4.31 V with 100–300 mV hysteresis. |
| EN (Pin 10) | Enable & PWM dimming input | High-voltage tolerant (up to VVIN+0.3 V); enables IC and supports "chopped battery" dimming when PWM pin is high. |
| PWM (Pin 12) | Dedicated logic dimming input | Direct PWM control (VIH = 1.8 V, VIL = 1.2 V); turns LED OFF when low, ON when high and EN is asserted. |
| ADIM (Pin 14) | Analog dimming & thermal foldback input | 0.6–1.5 V linear control range; interfaces with NTC thermistor for temperature-dependent current reduction. |
| CSH / CSL (Pins 22,21) | High-side current sense inputs | Differential sensing across RSENSE; ±3% accuracy enables stable 200 mA–1.5 A LED current programming. |
| FFn (Pin 15) | Open-drain fault flag output | Pulled low during LED open/short, overtemperature, or RSENSE short; requires external pull-up resistor. |
| VCC (Pin 18) | Internal 5 V LDO output | Supplies up to 14 mA; must be decoupled with 1 µF MLCC to PGND for stable biasing of internal and external circuits. |
| RNG (Pin 19) | Output current range select | Connect to VCC for 0.6–1.5 A range (VCSREG = 200 mV), or GND for 200–600 mA range (VCSREG = 100 mV) to optimize efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C junction operation - suitable for under-hood automotive lighting applications. |
| Integrated passive components | On-die VIN and boot capacitors plus embedded inductor - reduces BOM count by ≥7 parts and minimizes PCB area. |
| Ultra-low EMI architecture | Meets CISPR25 Class 5 radiated/conducted emissions with no external EMI filter required in typical configurations. |
| Two-stage LED fault detection | Programmable LED open fault masking (via FDSET voltage divider) and automatic hiccup-mode recovery upon persistent open condition. |
| Low-power shutdown | 1 µA typical quiescent current - preserves battery life in always-on vehicle systems such as map or puddle lights. |
Applications
| Daytime Running Lights (DRL) | Front/Rear Fog Lights |
|---|---|
Use Scenario: Continuous 24/7 illumination at reduced brightness for vehicle visibility in daylight or low-visibility conditions. IC Role / Device Role / Timing Role: Constant-current synchronous buck regulator maintaining stable 700–1500 mA LED string current despite wide input voltage swings (6–16 V). Use Value: Integrated thermal foldback via ADIM/NTC prevents LED degradation during extended operation; AEC-Q100 qualification ensures reliability over 15-year vehicle lifetime. |
Use Scenario: High-intensity, weather-resistant illumination activated only in fog, snow, or heavy rain. IC Role / Device Role / Timing Role: PWM-dimmable LED driver delivering up to 1.5 A with fast enable/disable response (<17 ms turn-off delay) for rapid fog light activation. Use Value: Fault-flag output (FFn) enables system-level diagnostics; wettable-flank QFN ensures robust solder joints in high-vibration environments. |
| Turn/Stop Lights | Dimmable Interior Lighting |
Use Scenario: High-brightness, fast-response signaling requiring precise current control and thermal management during repeated brake pulses. IC Role / Device Role / Timing Role: Synchronous buck controller with <80 ns minimum on-time enabling stable regulation even at high duty cycles (e.g., 12 V → 10 V output). Use Value: Dual dimming modes (PWM pin + EN pin) support both CAN-controlled brightness and legacy analog dimming; ±3% current accuracy ensures consistent luminance across lamp arrays. |
Use Scenario: User-adjustable ambient lighting in cabins, footwells, or overhead consoles with smooth dimming and thermal safety. IC Role / Device Role / Timing Role: Analog-dimming-capable LED driver using ADIM input to linearly scale current from 20% to 100% while supporting NTC-based thermal derating. Use Value: Integrated 5 V/14 mA LDO powers microcontroller or sensor circuitry; compact 4×6 mm footprint fits tight interior space constraints. |
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 max input, 2 A output, external inductor, no integrated LDO or ADIM interface | Requires external bias rail and thermal foldback circuit; suited for higher-current non-automotive designs | Select when >1.5 A output or discrete inductor flexibility is required; not drop-in due to missing ADIM and LDO. |
| LM3409QMYX/NOPB | 40 V max input, external MOSFETs and inductor, no integrated passives or spread spectrum | Needs full external power stage design; lacks built-in EMI mitigation and fault flag reporting | Choose for cost-sensitive industrial LED drivers where board space and EMC certification are secondary concerns. |
Compared with MPQ4425AGU-AEC1-P and LM3409QMYX/NOPB, the APM80900KNBATR offers superior integration (inductor, caps, LDO), automotive-grade reliability (AEC-Q100), and production-ready EMI compliance - reducing design time and validation risk for automotive lighting OEMs.
Availability
APM80900KNBATR is available at Aetrix Electronics and suitable for daytime running lights, front/rear fog lights, and turn/stop lighting systems requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant performance.
Supply support for APM80900KNBATR 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 APM80900KNBATR belongs to Allegro's automotive LED driver product line, engineered specifically for robust, low-EMI, high-efficiency illumination in safety-critical vehicle lighting systems.
FAQ
What is the maximum continuous LED output current supported by the APM80900KNBATR?
The APM80900KNBATR supports up to 1.5 A continuous LED output current when properly heatsinked on a 4-layer PCB. This rating assumes operation within the –40°C to +150°C junction temperature range and use of the high-range RNG setting (VCSREG = 200 mV). Thermal derating applies above 85°C ambient, and actual achievable current depends on input/output voltage differential and board-level thermal design.
How does the APM80900KNBATR implement thermal foldback protection?
The APM80900KNBATR implements thermal foldback via its ADIM pin, which accepts an analog voltage from an external NTC thermistor network. As temperature rises and NTC resistance drops, ADIM voltage decreases linearly, reducing the regulated LED current reference (VCSREG) proportionally - e.g., from 100% at 1.5 V to 20% at 0.6 V (RNG = High). This prevents thermal runaway without requiring external microcontroller intervention.
Can the APM80900KNBATR operate with a 24 V input and 12 V LED string output?
Yes, the APM80900KNBATR supports 24 V input with 12 V LED string output. Its 4.5–36 V input range and ~2 MHz fixed-on-time control ensure stable regulation across this condition. At 24 VIN/12 VOUT, typical efficiency is 82% at 1 A (per thermal characterization data), and minimum tON (80 ns) guarantees sufficient duty cycle margin. No external components are needed beyond RSENSE and basic input/output capacitors.
What fault conditions does the APM80900KNBATR detect and how is the fault signaled?
The APM80900KNBATR detects LED open circuit, LED short-to-ground, overtemperature (>150°C), and RSENSE hard shorts. All faults assert the open-drain FFn pin low (with <0.4 V pull-down voltage under 1 mA load). Faults are deglitched (50 µs) and masked during PWM startup (100 µs timer), and LED open faults trigger hiccup-mode recovery. The FFn signal remains latched until the next PWM rising edge after fault removal.
Is the APM80900KNBATR pin-compatible with other Allegro LED drivers like the A80601?
No, the APM80900KNBATR is not pin-compatible with the A80601 or other Allegro LED drivers. It uses a unique 32-pin QFN layout with dedicated terminals for integrated VIN/BOOT capacitors, dual current sense inputs (CSH/CSL), and separate EN/PWM dimming pins. Pin functions, spacing, and thermal pad connections differ significantly - PCB redesign is required for substitution.
APM80900KNBATR 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:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-QFN (4x6)
APM80900KNBATR FAQ
1.How can I place an order for APM80900KNBATR through Aetrix?
Please submit a Request for Quotation (RFQ) for APM80900KNBATR 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 APM80900KNBATR reliable?
The price and inventory of APM80900KNBATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APM80900KNBATR is usually 5 days.
3.What payment methods are accepted for APM80900KNBATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APM80900KNBATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APM80900KNBATR?
APM80900KNBATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APM80900KNBATR 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 APM80900KNBATR?
For technical support, including APM80900KNBATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APM80900KNBATR requirements.
6.How does Aetrix verify that APM80900KNBATR is sourced from the original manufacturer or authorized distributors?
All APM80900KNBATR 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 APM80900KNBATR meets industry standards.
7.What is the process for return or replacement of APM80900KNBATR?
All APM80900KNBATR units undergo pre-shipment inspection (PSI). If there is an issue with APM80900KNBATR, 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 APM80900KNBATR part is unused and in its original packaging.
Return procedure for APM80900KNBATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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