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

Allegro MicroSystems A8514KLPTR-T

Name: A8514KLPTR-T
Brand: Allegro MicroSystems
SKU: A8514KLPTR-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A8514KLPTR-T

Manufacturer:: Allegro MicroSystems

Category:: LED Drivers

Package:: 20-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: A8514KLPTR-T.pdf

Description:: IC LED DRV RGLTR PWM 20TSSOP

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Product details

Overview

A8514KLPTR-T from Allegro MicroSystems is a fault-tolerant, multi-output white LED driver IC for automotive LCD backlighting. It integrates a current-mode boost converter with internal 60 V DMOS switch and four independent 80 mA LED current sinks, operates from 5–40 V input, supports up to 12-series-LED strings per channel, and delivers 0.7–0.8% LED-to-LED current matching in automotive cluster and infotainment displays.

For engineers reviewing the A8514KLPTR-T datasheet, A8514KLPTR-T pinout, A8514KLPTR-T application, or A8514KLPTR-T equivalent, key selection criteria include its AEC-Q100 qualification, 580 kHz–2.3 MHz sync-capable switching frequency, dual OVP (primary + secondary), integrated PMOS disconnect driver, and thermal shutdown at 165°C - all critical for robust automotive lighting designs under load dump and cold-crank conditions.

Technical Context

The A8514KLPTR-T implements a current-mode boost controller with adaptive output voltage regulation (V_OUT = max(V_LED1–4) + 0.7 V) and cycle-by-cycle current limiting. Its four LED sinks operate in parallel or independently, each regulated via ISET resistor with 653 A/A gain and ±3% accuracy over –40°C to +125°C.

It features dual-level protection: primary OVP set by external ROVP (7.7–8.5 V threshold), secondary OVP at 53–58 V, plus open/short LED detection, boost switch overcurrent (3.0–4.2 A limit), and gate fault response within 3 µs for external PMOS disconnect control.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	5–40 V - withstands automotive load dump (40 V) and cold crank (5 V startup)
LED Current per Channel	80 mA - supports high-brightness white LED strings up to 12 in series
LED Matching Accuracy	0.7–0.8% - ensures uniform luminance across 4-string backlight systems
Switching Frequency Range	580 kHz–2.3 MHz - enables AM-band avoidance and compact magnetics
Overvoltage Protection	Dual-level: 7.7–8.5 V (primary), 53–58 V (secondary) - redundant safety for boost rail
Thermal Shutdown	165°C with 20°C hysteresis - prevents latch-up during sustained overload
PWM Dimming Ratio	5000:1 at 200 Hz - enables deep contrast control in display dimming

Pinout & Package

Package: 20-pin TSSOP with exposed thermal pad (suffix LP), lead-free, matte-tin plated.

Pin/Terminal	Circuit Role	Design Meaning
GATE	External P-FET gate driver	Controls input disconnect switch during fault; sinks –104 µA, supports –6.7 V V_GS
VSENSE	Current sense reference input	Measures VIN–VSENSE drop (94–114 mV trip); sinks 20.3 µA for UVLO and overcurrent detection
VIN	Main power input	Supplies IC and boost stage; UVLO start at 4.35 V, hysteresis 450 mV
FAULT	Open-drain fault indicator	Pulled low on shorted LED, overtemp, OVP, or boost fault; requires 100 kΩ pull-up
ISET	LED current programming input	Connects RISET to ground; sets 100% LED current (120 µA → 80 mA per channel)
FSET/SYNC	Frequency setting / sync input	Resistor sets f_SW (580 kHz–2.3 MHz); accepts external clock with ≥150 ns on/off time
PWM/EN	Enable & PWM dimming input	Logic-high enables IC; PWM signal controls LED intensity; internal 100 kΩ pull-down
LED1–LED4	LED string cathode outputs	Four independent current sinks; each regulates 80 mA with 600–800 mV compliance voltage
PGND	Power ground	Shared return for boost switch and LED sinks; pins 16–18 are tied internally
PAD	Exposed thermal pad	Mandatory PCB connection to ground plane via ≥8 vias for R_θJA = 29°C/W (4-layer)

Key Features

Feature	Design Value
AEC-Q100 qualified	Rated for automotive Grade 1 (–40°C to +125°C ambient), validated for vibration, ESD, and thermal cycling
Synchronized switching up to 2.3 MHz	Enables operation above AM radio band (1.6–3.0 MHz), reducing EMI filter size and cost
Dual OVP protection	Primary (7.7–8.5 V) via ROVP resistor + secondary (53–58 V) internal clamp - eliminates single-point failure risk
Integrated PMOS disconnect driver	GATE pin drives external P-FET to isolate VIN during FAULT, preventing system-level damage
LED pin short-to-ground detection	Halts power-up if any LEDx <70 mV detected; avoids uncontrolled current flow into shorted strings
Soft-start current limiting	Boost switch limited to 700 mA during startup, reducing inrush into output capacitors and extending component life

Applications

Automotive Infotainment Display	Automotive Instrument Cluster
Use Scenario: Backlighting for 7–10 inch TFT-LCD touchscreens in center-stack head units. IC Role / Device Role / Timing Role: Four-channel LED driver regulating 80 mA per string with adaptive V_OUT to minimize power loss across varying LED forward voltage. Use Value: 0.7% LED matching ensures uniform brightness; 5000:1 PWM dimming enables seamless UI transitions and night-mode readability.	Use Scenario: High-reliability backlight for analog/digital gauge clusters with mixed LED types and aging compensation. IC Role / Device Role / Timing Role: Fault-tolerant driver with open/short LED detection and thermal shutdown, ensuring fail-safe illumination during vehicle operation. Use Value: Dual OVP and 165°C thermal cutoff prevent catastrophic failure during load dump; AEC-Q100 qualification guarantees lifetime reliability.
Automotive Center Stack	Commercial Vehicle HMI
Use Scenario: Multi-zone backlighting for modular center console displays supporting HVAC, navigation, and media controls. IC Role / Device Role / Timing Role: Synchronized 2.3 MHz switching across multiple A8514KLPTR-T devices eliminates beat frequencies and EMI coupling between adjacent modules. Use Value: FSET/SYNC pin allows deterministic timing alignment; 40 V input tolerance accommodates 24 V truck electrical systems with transient spikes.	Use Scenario: Ruggedized display lighting in construction, agricultural, or mining equipment exposed to wide temperature swings and vibration. IC Role / Device Role / Timing Role: LED sink with 125°C junction rating and 40 V input range maintains stable output under extreme ambient conditions and battery fluctuations. Use Value: PGND and AGND separation minimizes noise coupling; exposed thermal pad sustains 80 mA/channel at full load without derating.

Automotive Infotainment Display

Automotive Instrument Cluster

Use Scenario: Backlighting for 7–10 inch TFT-LCD touchscreens in center-stack head units.

IC Role / Device Role / Timing Role: Four-channel LED driver regulating 80 mA per string with adaptive V_OUT to minimize power loss across varying LED forward voltage.

Use Value: 0.7% LED matching ensures uniform brightness; 5000:1 PWM dimming enables seamless UI transitions and night-mode readability.

Use Scenario: High-reliability backlight for analog/digital gauge clusters with mixed LED types and aging compensation.

IC Role / Device Role / Timing Role: Fault-tolerant driver with open/short LED detection and thermal shutdown, ensuring fail-safe illumination during vehicle operation.

Use Value: Dual OVP and 165°C thermal cutoff prevent catastrophic failure during load dump; AEC-Q100 qualification guarantees lifetime reliability.

Automotive Center Stack

Commercial Vehicle HMI

Use Scenario: Multi-zone backlighting for modular center console displays supporting HVAC, navigation, and media controls.

IC Role / Device Role / Timing Role: Synchronized 2.3 MHz switching across multiple A8514KLPTR-T devices eliminates beat frequencies and EMI coupling between adjacent modules.

Use Value: FSET/SYNC pin allows deterministic timing alignment; 40 V input tolerance accommodates 24 V truck electrical systems with transient spikes.

Use Scenario: Ruggedized display lighting in construction, agricultural, or mining equipment exposed to wide temperature swings and vibration.

IC Role / Device Role / Timing Role: LED sink with 125°C junction rating and 40 V input range maintains stable output under extreme ambient conditions and battery fluctuations.

Use Value: PGND and AGND separation minimizes noise coupling; exposed thermal pad sustains 80 mA/channel at full load without derating.

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	Single-channel buck-boost LED driver; no integrated current sinks; requires external MOSFETs and feedback network	Lacks multi-string capability and LED matching; suited for single-string or high-current discrete designs	Choose when flexibility in topology or higher current (>80 mA) per string is required, but adds BOM and layout complexity
TPS61165DRVR	Single-channel boost LED driver with 1.2 A switch; no multi-string support; 30 V max input; no AEC-Q100 rating	Not qualified for automotive; lacks fault tolerance features (no dual OVP, no LED short detect, no GATE driver)	Select only for non-automotive, cost-sensitive consumer lighting where AEC-Q100 and redundancy are not mandated

Compared with LM3409QMYX/NOPB and TPS61165DRVR, the A8514KLPTR-T uniquely integrates four matched current sinks, AEC-Q100 qualification, dual OVP, and an external disconnect driver - making it the only solution that meets full automotive backlight requirements without external supervision circuitry.

Availability

A8514KLPTR-T is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and center stack backlighting requiring stable component supply despite its Last Time Buy status.

Supply support for A8514KLPTR-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 A8514 product line was designed specifically for fault-tolerant, high-reliability automotive LCD backlighting - emphasizing input transient resilience, LED current precision, and comprehensive protection in harsh environments.

FAQ

Is A8514KLPTR-T still in production and available for new designs?

No - A8514KLPTR-T is classified as Last Time Buy with a July 31, 2024 deadline for final orders. It remains in production solely for existing customer applications; Allegro does not recommend it for new designs due to imminent obsolescence. Samples are no longer available, and design-in should consider long-term alternatives.

What is the maximum number of LEDs the A8514KLPTR-T can drive, and how is it configured?

The A8514KLPTR-T drives up to 48 white LEDs total: 12 LEDs per string across 4 parallel strings (LED1–LED4), each sinking 80 mA. Strings may be shortened or disabled using 2.37 kΩ pull-down resistors on unused LEDx pins, and the boost output adapts to the highest string voltage plus 0.7 V regulation headroom.

Does A8514KLPTR-T support both PWM and analog dimming simultaneously?

No - A8514KLPTR-T supports either PWM dimming via the PWM/EN pin (5000:1 ratio at 200 Hz) or analog dimming via the APWM pin (20–1000 kHz trimming input), but not both concurrently. APWM adjusts the internal ISET current reference, while PWM/EN directly gates LED current with precise timing control.

How does the A8514KLPTR-T handle LED string faults such as open or short circuits?

The A8514KLPTR-T detects open or shorted LED pins during power-up and continuous operation: LEDx <70 mV triggers short-to-ground halt; >325 mV confirms active use; 150 mV indicates unused pin. During operation, open/short events assert the FAULT pin low and disable LED sinks, while the GATE pin opens the external PMOS disconnect switch to isolate VIN.

What thermal management is required for A8514KLPTR-T in a 4-string 80 mA configuration?

For full-load operation (4 × 80 mA), the A8514KLPTR-T requires the exposed thermal pad (PAD) to be soldered to a minimum 3 in² copper area on a 2-layer PCB or connected via ≥8 vias to inner ground planes on a 4-layer board. This achieves R_θJA ≤ 29°C/W, keeping junction temperature below 150°C at 125°C ambient with proper airflow or enclosure design.

A8514KLPTR-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:: Obsolete

Type:: DC DC Regulator

Topology:: Step-Up (Boost)

Internal Switch(s):: Yes

Number of Outputs:: 4

Voltage - Supply (Min):: 5V

Voltage - Supply (Max):: 40V

Voltage - Output:: -

Current - Output / Channel:: 80mA

Frequency:: 580kHz ~ 2.3MHz

Dimming:: 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

A8514KLPTR-T FAQ

1.How can I place an order for A8514KLPTR-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A8514KLPTR-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 A8514KLPTR-T reliable?

The price and inventory of A8514KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8514KLPTR-T is usually 5 days.

3.What payment methods are accepted for A8514KLPTR-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8514KLPTR-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A8514KLPTR-T?

A8514KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A8514KLPTR-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 A8514KLPTR-T?

For technical support, including A8514KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8514KLPTR-T requirements.

6.How does Aetrix verify that A8514KLPTR-T is sourced from the original manufacturer or authorized distributors?

All A8514KLPTR-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 A8514KLPTR-T meets industry standards.

7.What is the process for return or replacement of A8514KLPTR-T?

All A8514KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8514KLPTR-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 A8514KLPTR-T part is unused and in its original packaging.

Return procedure for A8514KLPTR-T:

1.Submit a request within 90 days.

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

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