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Diodes Incorporated AL8843QSP-13
- Part No.:
- AL8843QSP-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AL8843QSP-13.pdf
- Description:
- IC LED DRIVER RGLTR PWM 3A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:61,408
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Product details
Overview
AL8843QSP-13 from Diodes Incorporated is an automotive-grade hysteresis-mode DC-DC step-down LED driver IC with integrated 40V NDMOS switch, supporting 4.5V–40V input and delivering up to 3A constant output current for series-connected LEDs. It features single-pin analog/PWM dimming control via CTRL, ±13% sense threshold hysteresis, and AEC-Q100 Grade 1 qualification for front/rear lighting systems.
For engineers reviewing the AL8843QSP-13 datasheet, AL8843QSP-13 pinout, AL8843QSP-13 application, or AL8843QSP-13 equivalent, key selection criteria include its 40V internal switch rating, 4% typical output current accuracy, SO-8EP thermal performance (θJA = 45°C/W), and dual dimming mode compatibility with 10–100% analog range and sub-500Hz PWM.
Technical Context
The AL8843QSP-13 employs fixed-frequency hysteresis control with internal voltage reference and comparator, using high-side current sensing through an external RSET resistor to regulate average LED current. Its switching operation is governed by VSET thresholds (96–104 mV) and ±13% hysteresis, enabling stable current regulation without external compensation.
Dimming is implemented via the CTRL pin, which accepts either 0.4–2.5V DC for 10–100% linear analog control or PWM signals with <1µs transition time and logic-level compatible thresholds (VLOW ≤ 0.3V, VHIGH ≥ 2.6V). Soft-start is externally adjustable via a capacitor from CTRL to GND (1.5ms/nF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide automotive battery transients including cold-crank (4.5V) and load-dump (40V). |
| Max Output Current | 3A - enables driving high-brightness LED strings (e.g., 3× 1A white LEDs) in DRL or fog lamp applications. |
| Internal Switch Rating | 40V NDMOS - eliminates need for external high-voltage switch; supports up to 60W output power with proper layout. |
| Current Sense Accuracy | ±4% typical - ensures tight LED brightness consistency across temperature (-40°C to +125°C ambient). |
| Switching Frequency | Up to 1MHz - allows compact magnetics (e.g., 47µH inductor) and reduces EMI filter size in space-constrained modules. |
| Dimming Interface | Single CTRL pin - supports both analog (0.4–2.5V) and PWM (≤500Hz, >1% duty cycle) with <1% dimming error at 500Hz. |
| Thermal Resistance | θJA = 45°C/W - achieved via SO-8EP exposed pad tied to PCB ground plane; enables 3A operation at +125°C ambient with minimal heatsinking. |
Pinout & Package
AL8843QSP-13 is housed in a thermally enhanced SO-8EP (exposed pad) package, optimized for automotive under-hood thermal environments. The exposed pad (EP) must be soldered to a minimum 2″×2″ 2oz copper ground plane for specified θJA = 45°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 GND | Ground reference | Primary return path for IC bias, current sense, and thermal conduction; must connect directly to EP and system ground plane. |
| 3 SET | Current sense reference | Connects to VIN via RSET; sets nominal LED current as IOUT = 0.1 / RSET (e.g., 0.033Ω → 3A). |
| 4 NC | No connection | Unbonded pin; must remain unconnected and unpopulated on PCB to avoid parasitic coupling. |
| 5 CTRL | Multi-function control | Accepts 0.4–2.5V analog dimming, PWM signal, or <0.3V shutdown; also sets soft-start time with external CCTRL. |
| 6 VIN | Main power input | 4.5–40V supply input; requires ≥10µF X7R ceramic decoupling capacitor placed within 3mm of pin. |
| 7, 8 SW | Power switch node | Drives external inductor and freewheeling diode; track length must be minimized to reduce EMI and switching losses. |
| EP | Exposed thermal pad | Electrically connected to GND; provides primary thermal path to PCB; requires full-solder coverage per IPC-7351B. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient operation with PPAP documentation support - meets OEM requirements for front lighting modules. |
| Inherent open-circuit LED protection | Auto-shutdown when LED string opens - prevents overvoltage stress on SW pin and eliminates need for external Zener clamp. |
| LED short-circuit protection | Detects low-impedance fault on output and limits current to safe level - avoids thermal runaway during wiring faults. |
| Over-temperature protection (OTP) | Shuts down at +150°C junction with +30°C hysteresis - maintains reliability in sealed headlamp enclosures with limited airflow. |
| High efficiency up to 97% | Minimizes thermal load in compact automotive housings - measured at 16V input, 9.6V output, 1A LED current with 47µH inductor. |
Applications
| Automotive Daytime Running Lights (DRL) | Automotive Front Fog Lights |
|---|---|
Use Scenario: Constant-current LED array powered from 12V/24V vehicle battery with transient immunity. IC Role / Device Role / Timing Role: Primary step-down LED driver with integrated switch, regulating 2–4 series white LEDs at 1.5–3A. Use Value: Delivers stable luminance across battery voltage swings (9–16V) and meets ECE R87 photometric tolerances via ±4% current accuracy. |
Use Scenario: High-output, thermally constrained LED module mounted in front bumper with limited airflow. IC Role / Device Role / Timing Role: Efficient 40V-rated buck controller managing 3A peak current into 3–5 LED strings. Use Value: SO-8EP thermal design enables 3A continuous operation at +125°C ambient without forced cooling, reducing BOM cost vs. discrete solutions. |
| Automotive Turn/Stop Lights | Automotive Dimmable Interior Lights |
Use Scenario: Fast-response LED brake light requiring PWM-compatible dimming and fault detection. IC Role / Device Role / Timing Role: Current-regulated driver with <1µs CTRL pin response, supporting 100Hz–500Hz PWM dimming. Use Value: Achieves <1% dimming error at 500Hz PWM while providing inherent open-circuit and short-circuit protection per ISO 16750-2. |
Use Scenario: Cabin lighting with smooth analog dimming and soft-start to eliminate visible turn-on flicker. IC Role / Device Role / Timing Role: Single-pin controlled driver accepting 0.4–2.5V analog input for seamless brightness adjustment. Use Value: Default 0.1ms soft-start ensures rapid startup; optional CTRL-to-GND capacitor extends ramp to 1.5ms/nF for flicker-free transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8863QSP-13 | Higher 5A output capability, 500kHz max switching frequency, same SO-8EP package and AEC-Q100 Grade 1 rating. | Targeted at higher-power rear combination lamps or adaptive driving beam (ADB) modules requiring >3A. | Select when output current >3A is required; shares identical pinout and CTRL interface but requires re-optimization of RSET and inductor. |
| LM3409QMYX/NOPB | Adjustable frequency (200kHz–1MHz), external MOSFET drive, no integrated switch; requires separate 40V FET and gate driver. | Suitable for designs needing flexible topology (e.g., SEPIC) or higher efficiency at ultra-low quiescent current (<0.1mA). | Choose for maximum design flexibility or when thermal constraints require remote FET placement; adds 3–4 components vs. AL8843QSP-13's single-chip solution. |
Compared with AL8843QSP-13, AL8863QSP-13 offers higher current headroom in identical footprint, while LM3409QMYX/NOPB trades integration for topology freedom and lower IQ - making AL8843QSP-13 optimal for cost-sensitive, space-constrained automotive LED modules requiring 3A and AEC-Q100 compliance.
Availability
AL8843QSP-13 is available at Aetrix Electronics and suitable for automotive daytime running lights, front fog lamps, and interior dimmable lighting systems requiring stable component supply, AEC-Q100 traceability, and long-term production continuity.
Supply support for AL8843QSP-13 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
Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices for automotive, industrial, and consumer markets, with IATF 16949-certified manufacturing facilities.
The AL8843QSP-13 belongs to Diodes' automotive LED driver product line, engineered specifically for high-reliability exterior and interior lighting applications demanding AEC-Q100 qualification, robust fault protection, and thermal resilience in harsh environments.
FAQ
What is the minimum input voltage required for AL8843QSP-13 to start switching?
The AL8843QSP-13 has an under-voltage lockout (UVLO) threshold of 3.9V (rising) with 250mV hysteresis. It begins normal switching operation only when VIN exceeds 3.9V and remains above 3.65V during operation. Below this, the internal switch remains disabled to prevent unstable regulation during cold-crank conditions.
How is LED current accuracy affected by temperature and input voltage variations?
Typical output current accuracy is ±4% over -40°C to +125°C ambient and 4.5V–40V input range. This is maintained by the internal 100mV ±4% VSET reference and matched current-sense circuitry; datasheet plots confirm <±5% deviation across full operating range with RSET tolerance included.
Can AL8843QSP-13 drive multiple parallel LED strings?
No - the AL8843QSP-13 regulates current in a single series string only. Driving parallel strings would cause current imbalance due to VF mismatch, risking thermal runaway. For multi-string applications, use one AL8843QSP-13 per string or select a multi-channel driver like the AL8861Q.
What is the recommended PCB layout practice for the SW pin to minimize EMI?
Keep the SW node trace as short and wide as possible, avoid vias, and route it directly to the inductor and freewheeling diode anode. Place the input capacitor (≥10µF X7R) within 3mm of VIN and GND pins, and use solid ground plane beneath the entire SO-8EP footprint to suppress high-frequency ringing and radiated emissions.
AL8843QSP-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 3A
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AL8843QSP-13 FAQ
1.How can I place an order for AL8843QSP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8843QSP-13 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 AL8843QSP-13 reliable?
The price and inventory of AL8843QSP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8843QSP-13 is usually 5 days.
3.What payment methods are accepted for AL8843QSP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8843QSP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8843QSP-13?
AL8843QSP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8843QSP-13 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 AL8843QSP-13?
For technical support, including AL8843QSP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8843QSP-13 requirements.
6.How does Aetrix verify that AL8843QSP-13 is sourced from the original manufacturer or authorized distributors?
All AL8843QSP-13 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 AL8843QSP-13 meets industry standards.
7.What is the process for return or replacement of AL8843QSP-13?
All AL8843QSP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL8843QSP-13, 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 AL8843QSP-13 part is unused and in its original packaging.
Return procedure for AL8843QSP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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