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Analog Devices Inc. AD8240YRM
- Part No.:
- AD8240YRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8240YRM.pdf
- Description:
- IC LED DRIVER LINEAR PWM 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,347
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Product details
Overview
AD8240YRM from Analog Devices is a constant-voltage LED driver/monitor IC designed for automotive exterior lighting, featuring PWM-controlled brightness, open-LED detection via high-side current sensing (gain = 24), latch-off overcurrent protection, 12 V regulated output (±1% typical), and operation from 9 V to 27 V supply. It drives an external NPN transistor to power LED strings in brake, running, and turn-signal lamps.
For engineers reviewing the AD8240YRM datasheet, AD8240YRM pinout, AD8240YRM application, or AD8240YRM equivalent, this page delivers verified specifications, functional block context, real-world automotive use cases, and validated alternative options for LED lamp monitoring and short-circuit–protected driving.
Technical Context
The AD8240YRM integrates four functional blocks: a linear regulator (Block A) that sets VO = 12 V using a 5 V reference and resistor divider; a high-side current-sense amplifier (Block B) with 24× gain and ±3% accuracy for detecting partial LED failures; a comparator (Block C) that latches off VO when VSENSE exceeds 5 V reference; and an intelligent driver (Block D) that conditions PWM input (3.5 V turn-on, 1.4 V turn-off) and provides 15 mA base drive.
It operates as a two-wire, constant-voltage solution enabling LED monitoring without added harness wiring-leveraging proportional current change across a shunt (e.g., 0.4 Ω) to detect 25% LED failure via 25% drop in VSENSE-and supports PWM frequencies up to 500 Hz with 5%–95% duty cycle range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12 V regulated (±1% typical at 25°C); enables stable LED string biasing independent of supply variation between 13 V–27 V. |
| VSENSE Gain | 24 V/V; scales shunt voltage to microcontroller ADC-friendly levels (e.g., 4.8 V at 500 mA with 0.4 Ω shunt). |
| PWM Thresholds | 3.5 V turn-on / 1.4 V turn-off; ensures robust CMOS-compatible digital control with hysteresis against noise. |
| Overcurrent Latch | Trips when VSENSE > 5 V reference; shuts down VO until next PWM cycle reset-protecting wiring and LEDs during shorts. |
| Operating Current | 360 µA typical (VPLUS > 13 V); minimizes quiescent load on vehicle battery in always-on modules. |
| Temp Range | −40°C to +125°C; qualified for under-hood and body-control module placement in automotive environments. |
| Supply Range | 9 V to 27 V continuous; accommodates cold-crank (9 V) and load-dump (27 V) transients per ISO 7637-2. |
Pinout & Package
AD8240YRM is housed in an 8-lead MSOP (RM-8) package, 3.0 mm × 3.0 mm, 0.65 mm pitch, JEDEC MO-187AA compliant, with exposed pad for thermal dissipation in high-current automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return for internal circuitry, shunt resistor, and external transistor emitter. |
| 2 (5V REF) | Internal reference input | Accepts externally supplied 5 V reference; sets VO = 12 V (12/5 × reference) with proportional tracking. |
| 3 (PWM) | Digital control input | CMOS-compatible level-sensitive input; high = VO enabled, low = VO disabled; supports dimming or on/off control. |
| 4 (VSENSE) | Current-sense amplifier output | High-impedance (10 kΩ) analog output proportional to LED current; used for failure detection and overcurrent monitoring. |
| 5 (VPLUS) | Main supply input | 9 V–27 V battery-supply input; powers all internal blocks and external transistor base drive. |
| 6 (BASE) | External transistor driver | 15 mA capable output that drives NPN pass transistor base; enables low-power, high-efficiency external switching. |
| 7 (VO) | Regulated output | 12 V constant-voltage output delivered to LED string anode; current-limited and latch-protected. |
| 8 (SHUNT) | High-side current sense input | Connects to shunt resistor high side; feeds current-sense amplifier (Block B) for open-LED and overcurrent detection. |
Key Features
| Feature | Design Value |
|---|---|
| PWM brightness control | Enables precise dimming (5%–95% duty) and on/off switching without external logic-reducing MCU GPIO count and firmware complexity. |
| Open-LED detection | Measures proportional current drop via VSENSE to identify partial failures (e.g., 25% LED loss → 25% VSENSE drop), satisfying automotive turn-signal and brake-light regulatory monitoring requirements. |
| Latch-off overcurrent protection | Shuts down VO instantly upon overcurrent and resets automatically each PWM cycle-eliminating need for external reset circuitry or watchdog timers. |
| Constant-voltage regulation | Delivers stable 12 V output across wide supply range (13 V–27 V), simplifying LED string design and enabling reuse of incandescent lamp wiring harnesses. |
| High-side current sensing | Isolates measurement from chassis ground return, avoiding shared-ground interference and enabling accurate two-wire monitoring in multi-lamp systems. |
Applications
| Rear Brake Lamp System | Front Running Light Module |
|---|---|
Use Scenario: Center high-mount and left/right brake lamps in passenger vehicles requiring ECE R7 or FMVSS 108 compliance. IC Role / Device Role / Timing Role: Constant-voltage LED driver and real-time current monitor; interfaces with body control module (BCM) via single PWM line and VSENSE feedback. Use Value: Detects partial LED failure (e.g., 3 of 12 LEDs open) by 25% VSENSE drop, ensuring minimum luminous intensity is maintained and triggering dashboard warning. | Use Scenario: Daytime running lights (DRL) powered from 12 V battery with ambient light–controlled dimming. IC Role / Device Role / Timing Role: PWM-driven linear LED driver with shutdown capability; accepts BCM-generated 100 Hz PWM signal for adaptive brightness control. Use Value: 360 µA operating current and 10 µA shutdown current extend battery life during ignition-off parking mode without compromising startup responsiveness. |
| Turn Signal Indicator Monitor | Truck Trailer Lighting Interface |
Use Scenario: Side-mounted turn signals on SUVs where rapid flash rate indicates bulb failure per SAE J1399. IC Role / Device Role / Timing Role: High-side current sensor and latch-protected driver; reports VSENSE to BCM for flash-rate anomaly detection and fault logging. Use Value: Enables fail-safe flash pattern recognition (e.g., double-speed blink) by correlating VSENSE amplitude drop with expected current profile-no additional CAN messaging required. | Use Scenario: Aftermarket trailer lighting adapter that replaces incandescent bulbs with LED arrays while retaining OEM connector pinout. IC Role / Device Role / Timing Role: Two-wire retrofit driver; VO connects to trailer LED anode, GND to chassis-no rewiring needed. Use Value: Eliminates need for separate ground-sense wires or lamp-end electronics; leverages existing 2-pin trailer harness for both power and monitoring via VSENSE feedback to towing vehicle BCM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver/monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16802AASA+ | Switching buck LED driver; no integrated current-sense amplifier; requires external op-amp for monitoring. | Higher efficiency (>90%) but lacks native open-LED detection; needs extra components for regulatory-compliant monitoring. | Select when thermal constraints prevent linear regulation and system can accommodate added sensing circuitry. |
| TLC59284PWR | 16-channel constant-current sink driver; no voltage regulation; no latch-off protection; I²C interface only. | Designed for interior RGB LED control-not automotive exterior lamp monitoring; no VSENSE analog output or PWM-level input. | Select only for non-safety-critical interior lighting with microcontroller-based current control and no regulatory monitoring requirement. |
Compared with MAX16802AASA+ and TLC59284PWR, the AD8240YRM uniquely combines constant-voltage regulation, integrated high-side current sensing, and latch-off protection in a single 8-lead MSOP-enabling full LED lamp monitoring and protection with minimal external components and zero harness modification.
Availability
AD8240YRM is available at Aetrix Electronics and suitable for automotive rear lighting systems, daytime running light modules, turn signal indicator monitors, and trailer lighting interfaces requiring stable component supply across extended temperature and voltage ranges.
Supply support for AD8240YRM 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
Analog Devices is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive safety systems.
The AD8240YRM belongs to Analog Devices' automotive LED driver/monitor product line, engineered specifically to replace incandescent lamp drivers while meeting stringent OEM requirements for open-circuit detection, short-circuit protection, and two-wire system compatibility.
FAQ
What is the primary function of the AD8240YRM in automotive lighting systems?
The AD8240YRM functions as a constant-voltage LED driver and monitor IC that regulates 12 V output to LED strings while providing real-time current sensing via its VSENSE pin. It detects open-LED faults, enforces latch-off overcurrent protection, and accepts PWM input for brightness control-all within an 8-lead MSOP package. The AD8240YRM enables compliance with automotive lighting regulations without modifying existing wiring harnesses.
How does the AD8240YRM achieve open-LED detection?
The AD8240YRM achieves open-LED detection using its integrated high-side current-sense amplifier (gain = 24) connected to an external shunt resistor. When LEDs fail open, load current drops proportionally, causing a corresponding decrease in VSENSE voltage (e.g., 25% LED loss → 25% VSENSE drop). This analog output is read by a microcontroller ADC to trigger diagnostics-making the AD8240YRM compliant with ECE R7 and FMVSS 108 monitoring mandates.
Can the AD8240YRM operate directly from a 12 V automotive battery?
Yes, the AD8240YRM operates from 9 V to 27 V, covering nominal 12 V battery, cold-crank (as low as 9 V), and load-dump transients (up to 27 V). However, regulated 12 V output requires VPLUS ≥13 V to overcome external transistor VBE and shunt voltage drop. At 12 V supply, VO remains unregulated but functional for basic on/off control-confirming the AD8240YRM's robustness across real-world automotive voltage profiles.
What external components are required for basic AD8240YRM operation?
Basic AD8240YRM operation requires five external components: (1) a 5 V reference applied to Pin 2, (2) an NPN power transistor (e.g., MJD2955) driven by Pin 6 (BASE), (3) a shunt resistor (e.g., 0.4 Ω) connected to Pin 8 (SHUNT), (4) a 22 nF capacitor (CM) from Pin 1 (GND) to Pin 6 (BASE) for stability, and (5) a 47 nF capacitor (CL) from Pin 7 (VO) to GND. No inductor or complex compensation network is needed-unlike switching alternatives-making the AD8240YRM a low-BOM-count solution.
Does the AD8240YRM support PWM dimming, and what are its timing limits?
Yes, the AD8240YRM supports PWM dimming via its CMOS-compatible Pin 3 (PWM) with 3.5 V turn-on and 1.4 V turn-off thresholds. It operates reliably up to 500 Hz PWM frequency and accepts 5%–95% duty cycle range-matching typical automotive requirements for brake (95%) vs. running (5%) light intensity. The AD8240YRM's latch-off feature resets automatically each PWM cycle, ensuring consistent behavior even during rapid on/off transitions.
AD8240YRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 9V
- Voltage - Supply (Max):
- 27V
- Voltage - Output:
- 12V
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8240YRM FAQ
1.How can I place an order for AD8240YRM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8240YRM 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 AD8240YRM reliable?
The price and inventory of AD8240YRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8240YRM is usually 5 days.
3.What payment methods are accepted for AD8240YRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8240YRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8240YRM?
AD8240YRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8240YRM 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 AD8240YRM?
For technical support, including AD8240YRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8240YRM requirements.
6.How does Aetrix verify that AD8240YRM is sourced from the original manufacturer or authorized distributors?
All AD8240YRM 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 AD8240YRM meets industry standards.
7.What is the process for return or replacement of AD8240YRM?
All AD8240YRM units undergo pre-shipment inspection (PSI). If there is an issue with AD8240YRM, 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 AD8240YRM part is unused and in its original packaging.
Return procedure for AD8240YRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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