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Allegro MicroSystems A8513KLPTR-T
- Part No.:
- A8513KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A8513KLPTR-T.pdf
- Description:
- IC LED DRVR RGLTR PWM 16ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,585
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Product details
Overview
A8513KLPTR-T from Allegro MicroSystems is a single-output, current-mode boost WLED driver IC for automotive and industrial LCD backlighting. It integrates a 60 V DMOS FET boost converter (2 MHz switching), a 150 mA LED current sink, and comprehensive fault protection-including OVP, UVP, open/short LED detection, overtemperature, and dual-level cycle-by-cycle current limiting. It operates from 4.5–40 V input, supporting cold-crank and load-dump conditions in automotive clusters and infotainment displays.
For engineers reviewing the A8513KLPTR-T datasheet, A8513KLPTR-T pinout, A8513KLPTR-T application, or A8513KLPTR-T equivalent, this page delivers verified technical context, package-specific pin functions, real-world dimming performance (5000:1 at 200 Hz), thermal resistance (34 °C/W on 4-layer PCB), and validated alternatives for AEC-Q100-compliant backlight designs.
Technical Context
The A8513KLPTR-T implements a current-mode boost controller with adaptive output voltage regulation-VOUT = VLED + 0.88 V-to minimize power loss across varying LED string voltages up to 14 series white LEDs. Its internal 2 MHz oscillator enables compact magnetics and AM-band immunity.
It features dual-level overcurrent protection: primary cycle-by-cycle limiting (2.2 A typical) and secondary latched shutdown (3.5 A typical) for catastrophic inductor shorts. Fault response includes non-latched OVP during transients and latched shutdown for open-LED + OVP coincidence, cleared only by EN/PWM low >16 ms or UVLO cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports automotive start-stop, cold crank (4.5 V), and load dump (40 V) without external pre-regulation |
| Boost Switching Frequency | 2 MHz (typical) - enables operation above AM radio band and allows use of small, low-ESR ceramic output capacitors |
| Max LED Current | 150 mA - sets upper bound for single-string backlight brightness and thermal design margin |
| LED String Capacity | Up to 14 series white LEDs - supports high-brightness automotive center stacks and digital instrument clusters |
| PWM Dimming Ratio | 5000:1 at 200 Hz - enables precise grayscale control in display applications without visible flicker |
| Junction Temp Limit | 150 °C - defines maximum allowable die temperature before thermal shutdown activates |
| Thermal Resistance θJA | 34 °C/W (on 4-layer JEDEC PCB) - determines required copper area and via count for thermal pad (PAD) to meet 125 °C ambient operation |
Pinout & Package
The A8513KLPTR-T is housed in a 16-pin TSSOP package with exposed thermal pad (LP suffix), Pb-free with 100% matte tin leadframe plating. The thermal pad must be connected to PCB ground plane using ≥8 thermal vias for reliable thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Boost switch drain node | Connects to boost inductor and Schottky diode anode; carries high-frequency pulsed current up to 2.2 A |
| 2 OVP | Output overvoltage sense input | Accepts resistive divider from VOUT to set OVP threshold (1.218 V internal reference); enables programmable protection up to 45 V |
| 3 VIN | Main power input | Supplies entire IC; UVLO thresholds (4.35 V rise / 3.90 V fall) ensure robust startup under battery sag |
| 4 FAULT | Open-drain fault indicator | Logic-low active signal alerts host MCU of latched faults (open LED + OVP, shorted inductor, overtemperature) |
| 5 VDD | Internal LDO output | Provides regulated bias for internal circuits; requires 0.1 μF decoupling capacitor to GND |
| 6 NC | No connection | Not internally bonded; must remain unconnected per datasheet |
| 7 NC | No connection | Not internally bonded; must remain unconnected per datasheet |
| 8 NC | No connection | Not internally bonded; must remain unconnected per datasheet |
| 9 NC | No connection | Not internally bonded; must remain unconnected per datasheet |
| 10 LED | LED string cathode connection | Sinks regulated current (up to 150 mA); internal open/short detection uses pre-charge test at power-up |
| 11 EN/PWM | Enable and PWM dimming input | Single-pin interface: logic-high enables IC and sets full LED current; PWM duty cycle controls brightness (5000:1 range) |
| 12 ISET | LED current programming input | Connect RISET resistor to GND to set max LED current (ILED = RISET × 1045 / 1.003 V) |
| 13 GND | Power and signal ground | Primary return path for LED current, boost switch, and analog circuitry; connects to thermal pad |
| 14 GND | Power and signal ground | Secondary ground pin for low-impedance return; must be tied to same ground plane as Pin 13 |
| 15 COMP | Error amplifier compensation node | External RC network (RZ/CZ) stabilizes feedback loop; soft-start sources 80 μA into this pin |
| 16 PAD | Exposed thermal pad | Internally connected to GND; mandatory PCB connection via ≥8 thermal vias to inner ground planes for thermal reliability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40 °C to +125 °C ambient operation - meets automotive electronics reliability requirements for cluster and infotainment systems |
| Dual-level boost switch current limiting | Primary (2.2 A) for cycle-by-cycle stability; secondary (3.5 A) for latch-off during inductor short - prevents FET destruction under fault |
| Adaptive output voltage regulation | VOUT = VLED + 0.88 V - minimizes power loss in LED current sink and improves system efficiency across varying LED forward voltages |
| Integrated secondary OVP on SW pin | 55.5 V threshold - protects internal 60 V DMOS FET during open-diode failure, preventing destructive voltage spikes |
| Fast EN/PWM response | 250 ns turn-on/turn-off delay - enables accurate low-duty-cycle PWM dimming without current droop or overshoot |
| Comprehensive fault diagnostics | Detects open/short LED, output short/UV/OV, ISET short, boost switch/inductor short, and overtemperature - reduces need for external monitoring circuitry |
Applications
| Automotive Instrument Cluster | Automotive Infotainment Display |
|---|---|
Use Scenario: Backlighting for TFT-LCD gauges and warning indicators in vehicle dashboards under wide battery voltage swings (5–16 V nominal, down to 4.5 V cold crank, up to 40 V load dump). IC Role / Device Role / Timing Role: Single-chip WLED driver providing regulated 150 mA current to 8–12 series white LEDs, with 2 MHz switching to avoid AM band interference. Use Value: Eliminates need for external boost controller + LED sink; AEC-Q100 qualification ensures reliability across automotive temperature and vibration profiles. |
Use Scenario: High-brightness backlight for 7–10 inch center-stack touchscreens operating in cabin environments with ambient temperatures up to 85 °C. IC Role / Device Role / Timing Role: Drives up to 14-series white LEDs at 150 mA with 5000:1 PWM dimming at 200 Hz for smooth grayscale rendering. Use Value: Adaptive VOUT regulation reduces power dissipation in current sink; thermal pad + 34 °C/W θJA enables stable operation without heatsink. |
| Industrial HMI Panel | Flatbed Scanner Illumination |
Use Scenario: Backlight for ruggedized LCD panels in factory automation HMIs exposed to 40 V surges and extended temperature cycling. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with latched OVP, open-LED detection, and thermal shutdown - ensures fail-safe behavior in safety-critical interfaces. Use Value: FAULT pin directly interfaces with PLC watchdog timer; no external fault logic required, reducing BOM and layout complexity. |
Use Scenario: Uniform linear illumination source for high-resolution document scanning, requiring precise intensity control and fast on/off switching. IC Role / Device Role / Timing Role: Provides 150 mA constant current to 6–8 series LEDs with <250 ns EN/PWM response for strobe-synchronized capture. Use Value: Fast dimming enable/disable eliminates motion blur; integrated current sink ensures consistent LED brightness independent of forward voltage variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16832ATP+T | Higher max input (60 V), but fixed 1.2 MHz fSW and no secondary OVP on SW pin; requires external current sense resistor | Better suited for industrial 48 V rail systems; lacks AEC-Q100 qualification and automotive fault coverage (no open-LED pre-charge) | Select when input exceeds 40 V or when external sensing is preferred; not drop-in for A8513KLPTR-T due to different pinout and control architecture |
| TPS61165DRVR | Lower max LED current (40 mA), no integrated 60 V FET (external switch required), and no latched open-LED + OVP fault mode | Targeted at portable consumer displays; lacks automotive-grade thermal and fault robustness | Only viable for low-current (<40 mA), non-automotive applications; requires redesign of boost stage and fault handling logic |
Compared with MAX16832ATP+T and TPS61165DRVR, the A8513KLPTR-T uniquely combines AEC-Q100 qualification, 2 MHz switching, integrated 60 V FET, adaptive VOUT regulation, and latched fault detection for open-LED + OVP - making it the only option qualified for demanding automotive cluster backlighting without external supervision.
Availability
A8513KLPTR-T is available at Aetrix Electronics and suitable for automotive instrument clusters, infotainment displays, and industrial HMI panels requiring stable component supply, AEC-Q100 compliance, and robust fault tolerance under wide-input-voltage transients.
Supply support for A8513KLPTR-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, headquartered in Worcester, Massachusetts, with global manufacturing and support infrastructure.
The A8513 product line was developed specifically for fault-tolerant, high-efficiency white LED backlighting in automotive and industrial LCD applications-emphasizing wide-input-voltage operation, integrated protection, and AEC-Q100 reliability.
FAQ
What is the maximum number of white LEDs the A8513KLPTR-T can drive in series?
The A8513KLPTR-T can drive up to 14 series white LEDs. This capability is enabled by its 60 V DMOS FET and adaptive output voltage regulation (VOUT = VLED + 0.88 V), which minimizes power loss while accommodating typical white LED forward voltages of ~3.2 V per device. The actual count depends on total string Vf and input voltage headroom - for example, at VIN = 12 V and Vf = 3.2 V, 14 LEDs require ~45 V output, well within the 55.5 V secondary OVP limit.
Does the A8513KLPTR-T support analog dimming in addition to PWM?
Yes, the A8513KLPTR-T supports analog dimming via the ISET pin using either a DAC or external resistive divider. Applying a variable voltage to the ISET node adjusts the ISET current (40–160 μA range), thereby scaling the LED current proportionally. However, analog dimming is limited to ~25:1 ratio due to the 40–160 μA ISET operating window, whereas PWM achieves 5000:1 at 200 Hz - making PWM the preferred method for high-contrast display applications.
How does the A8513KLPTR-T handle an open LED string fault?
The A8513KLPTR-T detects open LED strings during startup via LED pin pre-charge and during operation via absence of LED current at expected OVP threshold crossing. When both conditions occur simultaneously - i.e., OVP threshold reached *and* no LED current - the IC enters latched shutdown and asserts the FAULT pin low. Recovery requires holding EN/PWM low for >16 ms or cycling VIN through UVLO (below 3.90 V). This behavior is explicitly confirmed in Figures 10–12 of the A8513-DS Rev. 3 datasheet.
What is the thermal resistance (θJA) of the A8513KLPTR-T package, and how is it measured?
The A8513KLPTR-T has a θJA of 34 °C/W when mounted on a standard 4-layer JEDEC PCB. This value is measured under controlled lab conditions per JESD51-2 and JESD51-7 standards, using a board with defined copper layer stack-up and thermal via pattern under the exposed pad. Real-world θJA will increase on 2-layer boards (43 °C/W) or with insufficient thermal vias - so designers must follow Allegro's layout guidelines (≥8 vias to ground plane) to achieve rated thermal performance.
Is the A8513KLPTR-T pin-compatible with other variants in the A8513 family, such as the A8513KLYTR-T?
No, the A8513KLPTR-T (16-pin TSSOP-LP) is not pin-compatible with the A8513KLYTR-T (10-pin MSOP-LY). While both share identical functional blocks and electrical specifications, their pin counts, layouts, and terminal assignments differ significantly - e.g., the LP package has dedicated GND pins (13,14), four NC pins (1,2,8,9), and relocated COMP (15) and FAULT (4), whereas the LY package consolidates grounds and uses different pin numbering. PCB layout and footprint must be redesigned for each package variant.
A8513KLPTR-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:
- Discontinued at Digi-Key
- Type:
- DC DC Regulator
- Topology:
- SEPIC, Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 150mA
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A8513KLPTR-T FAQ
1.How can I place an order for A8513KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8513KLPTR-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 A8513KLPTR-T reliable?
The price and inventory of A8513KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8513KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8513KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8513KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8513KLPTR-T?
A8513KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8513KLPTR-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 A8513KLPTR-T?
For technical support, including A8513KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8513KLPTR-T requirements.
6.How does Aetrix verify that A8513KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8513KLPTR-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 A8513KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8513KLPTR-T?
All A8513KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8513KLPTR-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 A8513KLPTR-T part is unused and in its original packaging.
Return procedure for A8513KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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