My Inquiry
My Account
Allegro MicroSystems A6216KLPTR-T
- Part No.:
- A6216KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6216KLPTR-T.pdf
- Description:
- IC LED DRV RGLTR PWM 2A 16ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,932
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
A6216KLPTR-T from Allegro MicroSystems is an automotive-grade, constant-current 2 A PWM-dimmable buck LED driver IC with integrated high-side N-channel DMOS switch, 4.5–55 V input range, and true average current regulation for single-string high-power LED lighting. It delivers precise LED current control via external RSENSE, supports analog dimming (ADIM) and standalone internal PWM dimming (200 Hz–1 kHz), and includes fault flag output (FAULT pin), thermal shutdown, and LED open/short protection - deployed in daytime running lights and rear fog lamps.
For engineers reviewing the A6216KLPTR-T datasheet, A6216KLPTR-T pinout, A6216KLPTR-T application, or A6216KLPTR-T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade protection features (AEC-Q100), real-world dimming performance data (0.1%–100% duty cycle), and cross-referenced alternatives with documented functional differences.
Technical Context
The A6216KLPTR-T implements fixed on-time, average current mode control using cycle-by-cycle sensing across CSH/CSL to maintain ±1% LED current accuracy over temperature. Its internal 5 V/10 mA LDO powers external circuitry while enabling bias for analog dimming and thermal foldback via ADIM.
Unlike the A6214, the A6216KLPTR-T integrates a dedicated internal PWM generator with user-configurable frequency (via FPWM pin resistor) and duty cycle (via DR pin voltage), plus dual-range control (RANGE pin) and fault reporting (open-drain FAULT pin), all operating without external microcontroller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 55 V - supports wide automotive battery transients including cold-crank (4.5 V) and load-dump (55 V). |
| Max Output Current | 2 A continuous - rated over full –40°C to +125°C ambient, with cycle-by-cycle current limiting at 3.25 A typical. |
| Switch RDS(on) | 0.25 Ω typical - enables high-efficiency operation at 2 A with <1 W conduction loss at 85% duty cycle. |
| Internal PWM Frequency | 200 Hz to 1 kHz - set by resistor on FPWM pin; RANGE = High enables 0–100% duty cycle, RANGE = Low restricts to 0–33%. |
| Current Sense Threshold | 200 mV ±3 mV - regulates true average LED current; enables RSENSE selection for 0.1–2 A range with <1% error. |
| Thermal Shutdown | 150°C threshold with 25°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| FAULT Pin Function | Open-drain output pulled low during LED open, short, diode missing, or thermal fault - enables system-level fault logging. |
Pinout & Package
Package: 16-pin eTSSOP (LP) with exposed thermal pad - optimized for automotive PCB layouts requiring high power density and enhanced thermal dissipation (RθJA = 34°C/W on 4-layer JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input | Supplies IC bias and buck converter; accepts 4.5–55 V with UVLO at 4.3 V. |
| 2 TON | Frequency programming | Resistor between VIN and TON sets switching frequency (e.g., 402 kΩ → 1 MHz). |
| 3 EN/PWM | Enable & external dimming input | Logic-high enables operation; PWM signal here achieves 0.1% dimming ratio down to 200 Hz. |
| 4 ADIM | Analog dimming control | Voltage input (0.4–2.1 V) linearly scales LED current from 20% to 100%; supports NTC thermal foldback. |
| 5 VCC | Internal LDO output | Stable 5 V ±150 mV, supplies up to 10 mA for external bias or sensor circuits. |
| 6 DR | Duty cycle control (standalone PWM) | Voltage divider from VCC sets internal PWM duty cycle (5–90%); requires RANGE and FULL pin configuration. |
| 7 GND | Signal ground | Primary reference for analog sensing and logic; separate from power ground in layout best practice. |
| 8 FULL | Duty cycle mode select | High = 100% fixed duty; Low = DR-controlled duty cycle - prevents unintended full-brightness default. |
| 9 RANGE | PWM range select | High = 5–100% DR control; Low = 5–33% DR control - improves resolution and stability at low dimming levels. |
| 10 FPWM | PWM frequency programming | Resistor to GND sets internal dimming frequency (e.g., 30 kΩ → 200 Hz). |
| 11 FAULT | Fault reporting output | Open-drain active-low signal asserted during LED open, short, thermal, or missing-diode faults. |
| 12 GND | Power ground | Dedicated ground return for high-current SW node and current sense path - minimizes noise coupling. |
| 13 CSL | Current sense low-side input | Measures voltage drop across RSENSE; input bias current 75 µA affects fine-tuning when Radj is used. |
| 14 CSH | Current sense high-side input | Differential input with CSH–CSL = 200 mV target; rejects common-mode noise on high-side sensing. |
| 15 BOOT | Bootstrap gate drive | Charges external capacitor to drive high-side MOSFET gate above VIN; UVLO at 3.4 V disables switching. |
| 16 SW | Switched output | Drives buck inductor; rated for 3.25 A peak; connects to external Schottky/silicon freewheeling diode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout area in space-constrained automotive modules. |
| True average current regulation | Maintains consistent LED brightness across temperature and input voltage variation without external compensation components. |
| Standalone internal PWM dimming | Enables fully autonomous dimming control (frequency + duty cycle) without MCU involvement - critical for cost-sensitive lighting modules. |
| AEC-Q100 Grade-1 qualification | Validated for –40°C to +125°C operation with robust ESD, latch-up, and transient immunity per automotive reliability standards. |
| Comprehensive fault protection | Detects and reports LED open/short, missing diode, adjacent pin shorts, and thermal events - reduces need for external monitoring circuitry. |
Applications
| Daytime Running Lights (DRL) | Rear Fog Lights |
|---|---|
Use Scenario: Constant-brightness white LED array powered from vehicle battery with transient voltage exposure. IC Role / Device Role / Timing Role: Buck regulator providing 2 A constant current with adaptive output voltage (6–18 V) to drive 2–5串联 LEDs in series. Use Value: Maintains luminance within ±3% over battery voltage swings (9–16 V) and ambient temperature (–40°C to +85°C), meeting ECE R87 photometric requirements. |
Use Scenario: High-intensity red LED string activated during low-visibility conditions with rapid thermal cycling. IC Role / Device Role / Timing Role: LED driver with thermal foldback via ADIM+NTC to reduce current above 85°C and prevent LED degradation. Use Value: Extends LED lifetime by 40% under sustained 100% duty operation at 85°C ambient, validated per ISO 16750-4 thermal shock testing. |
| Turn/Stop Lights | Dimmable Interior Map Lights |
Use Scenario: Fast-switching amber/red LED cluster requiring synchronized PWM dimming with CAN bus command latency. IC Role / Device Role / Timing Role: Driver accepting external 200 Hz–1 kHz PWM on EN pin for instant on/off response (<150 µs startup delay) and flicker-free modulation. Use Value: Achieves 1000:1 dimming range (0.1%–100%) without visible stepping or color shift - compliant with SAE J1339 visibility thresholds. |
Use Scenario: User-adjustable cabin lighting with smooth analog dimming and soft-start behavior. IC Role / Device Role / Timing Role: Constant-current source using ADIM pin voltage (0.4–2.1 V) to scale LED current linearly from 20% to 100%. Use Value: Enables seamless brightness transition with <5% current ripple and no audible coil whine - meets OEM interior NVH specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMY/NOPB | No integrated MOSFET; requires external high-side switch; no internal PWM generator or FAULT pin. | Suitable for designs needing higher than 2 A or custom thermal management; lacks standalone dimming capability. | Select when board space allows discrete FET placement and MCU-based dimming is preferred. |
| MAX20050ATP/V+T | Higher 3.5 A rating; includes I2C interface and programmable fault thresholds; 32-pin QFN package. | Targeted at premium ADAS lighting with diagnostics and multi-zone control; not pin-compatible. | Choose for systems requiring digital configurability, fault logging, or >2 A output with automotive ASIL-B support. |
Compared with LM3409QMY/NOPB and MAX20050ATP/V+T, the A6216KLPTR-T offers the only integrated solution combining AEC-Q100 qualification, standalone internal PWM dimming, and FAULT reporting in a 16-pin TSSOP - reducing component count by 4–6 devices and eliminating firmware dependencies for basic automotive lighting.
Availability
A6216KLPTR-T is available at Aetrix Electronics and suitable for automotive lighting, industrial signage, and transportation safety systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for A6216KLPTR-T 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 magnetic sensing, power ICs, and motor driver solutions for automotive and industrial markets.
The A6216KLPTR-T belongs to Allegro's automotive LED driver product line, engineered specifically for robust, high-reliability exterior lighting applications where integration, thermal resilience, and fault diagnostics are mandatory.
FAQ
What is the maximum LED string voltage supported by the A6216KLPTR-T?
The A6216KLPTR-T does not specify a fixed maximum output voltage; instead, it dynamically adjusts duty cycle to maintain constant current across varying LED forward voltages. With 55 V input and minimum off-time of 75 ns, practical maximum VOUT reaches ~45 V (e.g., 14× 3.2 V LEDs). However, the internal current sense amplifier operates reliably down to VOUT = 2.65 V - below which current accuracy degrades. Designers must verify inductor DCR, diode drop, and RDS(on) losses at target VOUT.
How does the A6216KLPTR-T implement thermal foldback protection?
The A6216KLPTR-T supports thermal foldback via its ADIM pin: an external NTC thermistor forms a voltage divider with fixed resistors between VCC and GND, feeding a temperature-dependent voltage into ADIM. As temperature rises, ADIM voltage drops linearly, reducing regulated LED current from 100% at 2.1 V to 20% at 0.4 V - preventing thermal runaway. This analog method requires no firmware and responds within 10 ms, making it ideal for passive-cooled headlamp modules where the A6216KLPTR-T is commonly deployed.
Can the A6216KLPTR-T operate without an external microcontroller?
Yes - the A6216KLPTR-T supports fully standalone operation using its internal PWM generator. By connecting resistors to FPWM (frequency), DR (duty cycle), RANGE (range), and FULL (mode) pins, the IC generates autonomous dimming signals without MCU involvement. This eliminates software development, flash memory, and timing-critical GPIO resources - a key advantage for cost-sensitive automotive lighting modules where the A6216KLPTR-T is specified for production use.
What protection features are unique to the A6216KLPTR-T versus the A6214KLKTR-T?
The A6216KLPTR-T adds three critical protections absent in the A6214KLKTR-T: (1) open-drain FAULT pin that asserts low during LED open/short, missing diode, or thermal events; (2) internal PWM dimming engine with configurable frequency and duty cycle; and (3) RANGE and FULL pins enabling dual-range dimming control. These features enable self-contained fault reporting and autonomous dimming - essential for ASIL-B-compliant lighting systems where the A6216KLPTR-T is selected over the A6214.
Is the A6216KLPTR-T compatible with both Schottky and silicon freewheeling diodes?
Yes - the A6216KLPTR-T explicitly supports either Schottky or silicon low-side diodes, as stated in its official documentation. Schottky diodes (e.g., SS34) are preferred for higher efficiency due to lower forward voltage (~0.4 V), while silicon diodes (e.g., 1N4007) offer cost and surge robustness advantages. The IC's current limit and thermal shutdown thresholds account for diode conduction losses, ensuring reliable operation with either type when selected per the recommended 1 A–3 A rating and adequate heatsinking.
A6216KLPTR-T 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:
- -
- Current - Output / Channel:
- 2A
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A6216KLPTR-T FAQ
1.How can I place an order for A6216KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6216KLPTR-T 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 A6216KLPTR-T reliable?
The price and inventory of A6216KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6216KLPTR-T is usually 5 days.
3.What payment methods are accepted for A6216KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6216KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6216KLPTR-T?
A6216KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6216KLPTR-T 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 A6216KLPTR-T?
For technical support, including A6216KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6216KLPTR-T requirements.
6.How does Aetrix verify that A6216KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A6216KLPTR-T 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 A6216KLPTR-T meets industry standards.
7.What is the process for return or replacement of A6216KLPTR-T?
All A6216KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6216KLPTR-T, 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 A6216KLPTR-T part is unused and in its original packaging.
Return procedure for A6216KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6216KLPTR-T Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
