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Allegro MicroSystems APM80951KNBATR
- Part No.:
- APM80951KNBATR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 32-PowerFQFN
- Datasheet:
-
APM80951KNBATR.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.5A 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
APM80951KNBATR from Allegro MicroSystems is a low-EMI, PWM-dimmable synchronous buck LED driver IC with integrated high-side and low-side MOSFETs, 1.5 A continuous output current capability, 4.5–36 V input range, and QFN-32 package. It regulates LED current via external sense resistor and supports internal/external PWM and analog dimming for automotive and industrial lighting.
For engineers reviewing the APM80951KNBATR datasheet, APM80951KNBATR pinout, APM80951KNBATR application, or APM80951KNBATR equivalent, key selection considerations include its 1.5 A regulated current, 200 mV current-sense threshold at high-range mode, integrated SR control, 120 Ω EMI filter compatibility, and dual dimming interface support (ADIM/PWM/FFn).
Technical Context
The APM80951KNBATR implements a constant-current synchronous buck topology with adaptive gate drive for high-side and low-side MOSFETs, enabling >90% efficiency across 4.5–36 V input. It integrates current-mode PWM control with adjustable switching frequency via external resistor on FPWM pin.
It features dual dimming architecture: analog dimming via ADIM pin (0.4–7 V input mapping to 0–100% current reference), and programmable internal PWM (200 Hz default, set by RFPWM) or external PWM injection via PWM pin. UVLO hysteresis (100–300 mV) and VVIN start threshold (≤4.3 V) ensure robust startup under varying supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports 12 V and 24 V automotive and industrial bus rails without pre-regulation. |
| Max Output Current | 1.5 A - continuous LED current regulation with thermal foldback protection. |
| Current Sense Threshold | 200 mV (RNG = VCC) or 100 mV (RNG = GND) - sets full-scale current via Rsense = 0.2 Ω or 0.1 Ω respectively. |
| Internal PWM Frequency | 200 Hz (configurable via FPWM pin resistor) - enables flicker-free dimming compatible with camera systems. |
| Dimming Interfaces | ADIM (0.4–7 V analog), PWM (0–100% duty), FFn (frequency modulation) - supports multi-mode lighting control without external logic. |
| UVLO Hysteresis | 100–300 mV - prevents oscillation during brown-in/brown-out transitions in noisy vehicle environments. |
| Package | QFN-32 (5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad) - enables compact, thermally efficient PCB layout. |
Pinout & Package
APM80951KNBATR is housed in a 5 mm × 5 mm QFN-32 package with wettable flank leads and an exposed thermal pad (pin 32 = VOUT/GND thermal connection). The package supports reflow soldering per JEDEC J-STD-020 and requires controlled thermal relief for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 5,6,7) | Input power supply | Accepts 4.5–36 V DC; multiple pins reduce trace resistance and improve current handling. |
| SW (Pins 24,26,28,29) | Switch node | Connects to external inductor; multiple pins minimize switching loop inductance for EMI reduction. |
| VOUT (Pins 1,2,3,4,30,31,32) | Output / thermal pad | Delivers regulated LED current; pins 30–32 are tied to internal power ground and thermal pad for heatsinking. |
| CSH / CSL (Pins 22,21) | Current sense inputs | Differential sensing across external Rsense; enables accurate 1.5 A current regulation with 200 mV full-scale. |
| EN (Pin 10) | Enable control | Active-high logic input (1.8 V threshold); enables/disables converter and associated bias circuitry. |
| PWM (Pin 12) | External PWM dimming | Accepts 0–100% duty cycle signal up to 20 kHz; overrides internal PWM when asserted. |
| ADIM (Pin 14) | Analog dimming input | 0.4–7 V input maps linearly to LED current reference; requires external voltage source, not floating. |
| RNG (Pin 17) | Current range select | High = 200 mV CS threshold (1.5 A with 0.133 Ω Rsense); Low = 100 mV (0.75 A with same Rsense). |
| FPWM (Pin 18) | Frequency programming | Resistor-to-ground sets internal PWM frequency: fPWM = 14000 / RFPWM (kΩ), e.g., 69.8 kΩ → 200 Hz. |
| FFn (Pin 15) | Frequency foldback enable | Logic-low disables frequency foldback; logic-high enables automatic frequency reduction under overload. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates need for external power switches and gate drivers, reducing BOM count and layout complexity. |
| Synchronous rectification control | Enables >93% peak efficiency at 12 V input / 1 A output, minimizing thermal stress in enclosed fixtures. |
| Low-EMI design with spread-spectrum and optimized SW routing | Meets CISPR 25 Class 5 radiated emissions limits with minimal external filtering (e.g., FB1 120 Ω @ 100 MHz). |
| Multi-mode dimming (ADIM + PWM + FFn) | Allows seamless integration into legacy analog systems, digital PWM controllers, and adaptive lighting networks. |
| Configurable current range via RNG pin | Supports two precision current scales (100 mV or 200 mV sense voltage) using single Rsense footprint. |
Applications
| Automotive Headlamp Driver | Industrial Machine Vision Lighting |
|---|---|
|
Use Scenario: Driving high-brightness white LEDs in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current buck regulator with fast PWM dimming response (<1 µs rise/fall) for pixel-level illumination control. Use Value: Enables precise 200 Hz internal PWM dimming synchronized to camera frame rate, eliminating rolling shutter artifacts. |
Use Scenario: Illuminating inspection targets in factory automation cameras requiring uniform, flicker-free light pulses. IC Role / Device Role / Timing Role: LED current controller with analog dimming interface for intensity calibration and external PWM trigger for strobe timing. Use Value: ADIM pin accepts 0–5 V DAC output for ±1% intensity repeatability; SW node layout minimizes EMI coupling into image sensors. |
| Commercial Architectural LED Module | Outdoor Signage Power Supply |
|
Use Scenario: Powering multi-string RGBW LED arrays in tunable-white architectural fixtures with DALI or 0–10 V control. IC Role / Device Role / Timing Role: Primary current regulator per channel, interfacing with microcontroller via ADIM and EN for color mixing and sequencing. Use Value: Dual current ranges (via RNG) allow one board design to support both high-lumen white and low-power accent channels. |
Use Scenario: Driving long LED strings in outdoor electronic message centers exposed to wide temperature and voltage variation. IC Role / Device Role / Timing Role: Robust buck controller with 36 V absolute max input and 300 mV UVLO hysteresis for reliable operation in 24 V battery systems. Use Value: Integrated thermal foldback and PGND/VOUT pin multiplexing simplify heatsink mounting and improve long-term reliability in unventilated enclosures. |
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, 2.5 A output, no integrated MOSFETs, requires external high-side switch. | Requires additional gate driver and MOSFET layout; higher BOM cost but supports higher current scaling. | Choose when >1.5 A output or AEC-Q100 Grade 1 qualification is mandatory; APM80951KNBATR offers lower system footprint. |
| LM3409HVMM/NOPB | Adjustable frequency (100 kHz–1 MHz), no integrated MOSFETs, analog dimming only (no PWM generator). | Lacks internal PWM dimming engine and EMI-optimized layout; requires external oscillator and dimming logic. | Prefer LM3409HVMM/NOPB for high-frequency (>500 kHz) designs where size is constrained but EMI filtering is handled externally. |
Compared with MPQ4425AGU-AEC1-P and LM3409HVMM/NOPB, the APM80951KNBATR delivers lowest system-level component count for 1.5 A LED drivers, integrates EMI mitigation features directly into pinout and control architecture, and provides out-of-box PWM dimming without external timing components.
Availability
APM80951KNBATR is available at Aetrix Electronics and suitable for automotive headlamps, industrial machine vision lighting, commercial architectural LED modules, and outdoor signage requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for APM80951KNBATR 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 APM80951KNBATR belongs to Allegro's APM809xx family of integrated LED drivers, designed specifically for low-EMI, high-reliability solid-state lighting in harsh environments including automotive exterior lighting and factory automation.
FAQ
What is the maximum LED current supported by the APM80951KNBATR?
The APM80951KNBATR supports up to 1.5 A continuous regulated LED current. This is achieved with a 200 mV current-sense threshold (RNG = VCC) and a 0.133 Ω external sense resistor. Thermal derating applies above 85°C ambient; full 1.5 A rating assumes proper PCB copper area and airflow per the demo board layout in the APM80951-UM.
How do I configure the APM80951KNBATR for analog dimming only?
To use analog dimming exclusively on the APM80951KNBATR, apply a 0.4–7 V DC voltage to the ADIM pin, ensure the PWM pin is left unconnected (not floating-tie to GND if unused), and disable internal PWM by shorting DR to VCC via Rdrt. The LED current scales linearly: iLED = (VADIM – 0.4) / (5 × Rsense).
Does the APM80951KNBATR require an external bootstrap capacitor?
No, the APM80951KNBATR does not require an external bootstrap capacitor. Its internal charge pump generates the gate drive voltage for the high-side MOSFET. The BOOT pin (Pin 23) is not used and must be left unconnected or tied to SW per the datasheet recommendation-no external capacitor is needed or specified in the APM80951-UM design.
What is the purpose of the RNG pin on the APM80951KNBATR?
The RNG pin on the APM80951KNBATR selects between two current-sense voltage thresholds: 200 mV (RNG = VCC) or 100 mV (RNG = GND). This allows one PCB layout to support two different LED current ranges using the same Rsense footprint-e.g., 0.2 Ω yields 1.0 A at 200 mV or 0.5 A at 100 mV-enabling flexible design reuse.
Can the APM80951KNBATR operate from a 48 V input rail?
No, the APM80951KNBATR cannot operate from a 48 V input rail. Its absolute maximum input voltage is 40 V, and recommended operating range is 4.5–36 V. Applying 48 V exceeds the absolute maximum rating and risks permanent damage. For 48 V systems, consider a pre-regulator stage or alternative drivers rated for ≥60 V input, such as the MAX20050.
APM80951KNBATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 32-PowerFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Buck
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 5V
- Current - Output / Channel:
- 1.5A
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-QFN (4x6)
APM80951KNBATR FAQ
1.How can I place an order for APM80951KNBATR through Aetrix?
Please submit a Request for Quotation (RFQ) for APM80951KNBATR 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 APM80951KNBATR reliable?
The price and inventory of APM80951KNBATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APM80951KNBATR is usually 5 days.
3.What payment methods are accepted for APM80951KNBATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APM80951KNBATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APM80951KNBATR?
APM80951KNBATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APM80951KNBATR 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 APM80951KNBATR?
For technical support, including APM80951KNBATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APM80951KNBATR requirements.
6.How does Aetrix verify that APM80951KNBATR is sourced from the original manufacturer or authorized distributors?
All APM80951KNBATR 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 APM80951KNBATR meets industry standards.
7.What is the process for return or replacement of APM80951KNBATR?
All APM80951KNBATR units undergo pre-shipment inspection (PSI). If there is an issue with APM80951KNBATR, 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 APM80951KNBATR part is unused and in its original packaging.
Return procedure for APM80951KNBATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APM80951KNBATR Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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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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