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Allegro MicroSystems A8519KLPTR-T
- Part No.:
- A8519KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A8519KLPTR-T.pdf
- Description:
- IC LED DRVR RGLTR PWM 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
A8519KLPTR-T from Allegro MicroSystems is an automotive-grade, multi-output LED driver IC designed for LCD backlighting in harsh environments. It integrates a 42 V current-mode boost converter with internal MOSFET and four precision current sinks, delivering 100 mA per string (up to 44 white LEDs), operating from 4.5–40 V input, and featuring AEC-Q100 qualification for automotive cluster and infotainment systems.
For engineers reviewing the A8519KLPTR-T datasheet, A8519KLPTR-T pinout, A8519KLPTR-T application, or A8519KLPTR-T equivalent, this page provides verified technical context on PWM/analog dimming support (100,000:1 contrast), hysteresis-controlled short-PWM response, fault-tolerant protection architecture, and TSSOP-20 LP package thermal performance - all critical for automotive backlight BOM validation and layout design.
Technical Context
The A8519KLPTR-T implements a current-mode boost controller with cycle-by-cycle overcurrent limiting and hysteresis-based LED current regulation optimized for sub-microsecond PWM on-times. Its internal 42 V NMOS switch supports up to 4.5 A peak current, while the four independent current sinks achieve 0.7% absolute accuracy and 0.8% inter-string matching via trimmed ISET-to-ILED gain (710 A/A typical).
It features dual dimming control: digital PWM input (100–400 Hz) directly modulates LED current with <0.5 µs turn-on delay, while APWM enables analog trimming of IISET. The FSET pin configures switching frequency from 200 kHz to 2.15 MHz (or synchronizes externally from 320 kHz to 2.3 MHz), with dithering to suppress EMI peaks - all coordinated by an integrated soft-start and LED pin detection sequence during power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - withstands automotive load dump transients; operates down to 3.9 V after startup for idle-stop compatibility. |
| LED Output Current | 100 mA per string × 4 - supports up to 44 white LEDs (11 per string); parallel sinks enable up to 400 mA total. |
| Dimming Contrast Ratio | 100,000:1 - achieved only when combining PWM + analog dimming; 10,000:1 with PWM alone at 100 Hz. |
| Switching Frequency | 200 kHz to 2.15 MHz - programmable via RFSET resistor; dithering ±5% reduces EMI; sync-capable up to 2.3 MHz. |
| LED Current Accuracy | ±0.7% - guaranteed over –40°C to +125°C; enables consistent luminance across temperature and unit variance. |
| Hysteresis Window | 350 mV - fixed for A8519KLPTR-T (vs. 150 mV for -1 variant); stabilizes regulation during ultra-short PWM pulses. |
| Thermal Resistance | 29 °C/W - measured on 4-layer JEDEC-standard PCB; enables reliable operation at full load in automotive ambient. |
Pinout & Package
Package: 20-pin TSSOP with exposed thermal pad (suffix LP), RoHS-compliant matte tin plating, 4000 pieces per reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input & current sense reference | Accepts 4.5–40 V; supplies internal LDO and sets current-sense threshold (VIN–VSENSE = 110 mV typ). |
| PWM | Enable & digital dimming input | Logic-high (>1.5 V) enables IC; PWM signal controls LED brightness with <0.5 µs on-delay and 0.36 µs off-delay. |
| ISET | LED current programming node | RISET resistor to GND sets IISET (20–144 µA); determines 100 mA/string via 710× gain and 0.7% accuracy. |
| LED1–LED4 | Current sink outputs | Each sinks up to 100 mA; unused pins must be terminated to AGND with 3.09 kΩ for safe regulation disable. |
| GATE | External P-MOSFET driver | Sinks –113 µA / sources 6 mA; disconnects input during OCP fault with <3 µs shutdown delay. |
| FAULT | Open-drain fault indicator | Pulled low on OVP, OCP, thermal shutdown, or LED open/short; requires external 100 kΩ pull-up. |
| FSET | Frequency/sync control | RFSET to GND sets fSW (200 kHz–2.15 MHz); external clock input (320 kHz–2.3 MHz) disables dithering. |
| COMP | Error amplifier output | Connect Rz–Cz–Cp network for loop compensation; internal 1.4 kΩ pull-down aids stability. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and stress-test requirements. |
| Integrated 42 V NMOS boost switch | 250 mΩ typical RDS(on); 4.5 A cycle-by-cycle current limit - eliminates external high-voltage switch and sense resistor. |
| Four matched current sinks | 0.8% inter-string matching ensures uniform backlight luminance across all LED strings without external balancing. |
| VOUT-to-GND short protection | Uses optional external P-MOSFET driven by GATE pin - prevents damage during LED string ground faults. |
| Dithered switching frequency | ±5% modulation at 12.5 kHz - spreads EMI energy across spectrum to ease AM-band compliance in vehicle cabins. |
Applications
| Automotive Instrument Cluster | Center Stack Infotainment Display |
|---|---|
Use Scenario: High-brightness, variable-contrast backlight for TFT-LCD gauges exposed to wide ambient temperature and voltage transients. IC Role / Device Role / Timing Role: Primary LED driver managing four independent backlight strings with synchronized PWM dimming and real-time fault monitoring. Use Value: Maintains 100,000:1 contrast ratio across –40°C to +85°C while surviving 40 V load dump events without external protection circuitry. |
Use Scenario: Dynamic backlight control for center console displays requiring smooth dimming transitions and EMI suppression near audio systems. IC Role / Device Role / Timing Role: Fault-tolerant boost LED driver with dithered 2.15 MHz switching and APWM-assisted analog trim for flicker-free UI rendering. Use Value: Enables >90% efficiency at 12 V input while meeting CISPR-25 Class 5 radiated emissions limits without added shielding. |
| Automotive HUD Projection Module | ADAS Camera Display Backlight |
Use Scenario: Compact, thermally constrained HUD illumination system requiring precise current regulation and fast PWM response. IC Role / Device Role / Timing Role: Hysteresis-controlled LED driver delivering stable 100 mA per string with <0.75 µs minimum PWM on-time support. Use Value: Eliminates visible brightness stepping during rapid HUD brightness adjustments due to sub-microsecond regulation recovery. |
Use Scenario: Safety-critical rearview/camera display needing fail-safe operation under battery undervoltage and thermal overload conditions. IC Role / Device Role / Timing Role: Redundant-protection LED driver with OVP, OCP, LED open/short detect, and thermal shutdown latching. Use Value: Guarantees graceful shutdown and FAULT pin assertion within 3 µs of overtemperature event - enabling ASIL-B compliant diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMYX/NOPB | Adjustable 1.25 A buck-boost LED driver; no integrated current sinks; requires external MOSFET and sense resistors. | Lacks multi-string integration and AEC-Q100 qualification; suited for non-automotive industrial lighting. | Select if board space allows discrete layout and cost sensitivity outweighs integration benefits. |
| TPS61165DRVR | Single-output 40 V boost LED driver with 1.5 A switch; no hysteresis control; max 1000:1 PWM contrast. | No multi-string capability or VOUT-to-GND short protection; not AEC-Q100 qualified. | Choose only for single-string designs where thermal margin and automotive qualification are not required. |
Compared with LM3409QMYX/NOPB and TPS61165DRVR, the A8519KLPTR-T delivers higher integration (4 sinks + boost), superior dimming fidelity (100,000:1), and automotive-grade reliability - reducing component count, PCB area, and validation effort for multi-string automotive backlight systems.
Availability
A8519KLPTR-T is available at Aetrix Electronics and suitable for automotive instrument clusters, center stack infotainment displays, and HUD projection modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for A8519KLPTR-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 designer of high-performance power ICs and magnetic sensors, specializing in automotive and industrial motion control solutions.
The A8519 product line was developed specifically for fault-tolerant, high-efficiency LED backlighting in automotive cockpits - emphasizing wide-input operation, multi-string precision, and robust protection against electrical and thermal faults.
FAQ
What is the maximum LED string voltage supported by the A8519KLPTR-T?
The A8519KLPTR-T supports up to 40 V output voltage, sufficient for driving 11 white LEDs in series (typical VF ≈ 3.6 V each). This is enforced by internal secondary overvoltage protection at the SW pin (45 V threshold) and primary OVP sensing via the OVP pin, configurable down to 7 V using ROVP.
Does the A8519KLPTR-T require external components for basic operation?
Yes - the A8519KLPTR-T requires external components including: boost inductor (L1), output capacitor (COUT), input capacitor (CIN), current-sense resistor (RSC), OVP divider (ROVP), frequency-setting resistor (RFSET), LED current-setting resistor (RISET), and compensation network (RZ/CZ/CP) on COMP. These are mandatory for regulation, protection, and stability.
How does the A8519KLPTR-T handle LED string open-circuit faults?
The A8519KLPTR-T detects open LED strings during startup and runtime by monitoring VLEDx pin voltage. If any LEDx pin remains below 70 mV (indicating short) or exceeds 325 mV (indicating open), the IC halts soft-start and asserts FAULT. During operation, sustained VLEDx > 7.0 V triggers immediate shutdown and FAULT pin activation.
Can the A8519KLPTR-T operate with input voltage below 4.5 V?
Yes - the A8519KLPTR-T starts only above 4.35 V UVLO threshold but sustains operation down to 3.9 V after startup, supporting automotive idle-stop functionality. Below 3.9 V, the IC shuts down and requires PWM low pulse >16 ms to re-enable upon VIN recovery.
What is the purpose of the APWM pin on the A8519KLPTR-T?
The APWM pin on the A8519KLPTR-T accepts either an analog voltage (0–1.2 V) or digital PWM signal to fine-tune the internal IISET current, enabling hybrid dimming. When combined with the main PWM pin, it extends the effective dimming ratio from 10,000:1 to 100,000:1 while maintaining stable regulation at ultra-low duty cycles.
A8519KLPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 100mA
- Frequency:
- 200kHz ~ 2.15MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
A8519KLPTR-T FAQ
1.How can I place an order for A8519KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8519KLPTR-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 A8519KLPTR-T reliable?
The price and inventory of A8519KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8519KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8519KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8519KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8519KLPTR-T?
A8519KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8519KLPTR-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 A8519KLPTR-T?
For technical support, including A8519KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8519KLPTR-T requirements.
6.How does Aetrix verify that A8519KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8519KLPTR-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 A8519KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8519KLPTR-T?
All A8519KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8519KLPTR-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 A8519KLPTR-T part is unused and in its original packaging.
Return procedure for A8519KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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