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Analog Devices Inc. AD8240YRMZ
- Part No.:
- AD8240YRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8240YRMZ.pdf
- Description:
- IC LED DRIVER LINEAR PWM 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,008
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Product details
Overview
AD8240YRMZ from Analog Devices is a constant-voltage LED driver/monitor IC designed for automotive lamp control. It regulates output to 12 V (±1% typical), supports 9 V to 27 V supply, delivers up to 500 mA output current, and integrates high-side current sensing with 24× gain for open-LED detection - used with external NPN transistor in body control modules for brake/running/turn-signal lamps.
For engineers reviewing the AD8240YRMZ datasheet, AD8240YRMZ pinout, AD8240YRMZ application, or AD8240YRMZ equivalent, this page provides verified functional block architecture, latch-off overcurrent protection timing (2 µs delay), PWM brightness control (DC–500 Hz), VSENSE output impedance (10 kΩ), and automotive-grade thermal range (−40°C to +125°C) - all confirmed from Analog Devices Rev. 0 datasheet.
Technical Context
The AD8240YRMZ implements a linear regulator (Block A) that sets VO = (12/5) × 5 V reference, making output accuracy directly dependent on reference stability. Its high-side current-sense amplifier (Block B) provides 24× gain and ±3% accuracy to convert shunt voltage into measurable VSENSE for microcontroller ADC input.
Block C contains a comparator that triggers latch-off when VSENSE exceeds 5 V reference by >0.1 V, disabling VO until next PWM cycle reset. Block D integrates intelligent driver logic that conditions PWM input (3.5 V turn-on / 1.4 V turn-off thresholds), supplies 15 mA base drive, and enables both dimming and on/off control without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VO Regulation | ±1% typical at 25°C; ensures stable 12 V lamp bias despite supply variation (13–27 V) |
| Output Current | 500 mA max with RSHUNT = 0.4 Ω; sets safe drive level for multi-LED strings |
| VSENSE Gain | 24× fixed; converts shunt voltage to scalable signal for MCU A/D or comparator monitoring |
| PWM Frequency Range | DC to 500 Hz; compatible with standard automotive BCM PWM generators |
| Operating Temp | −40°C to +125°C; qualified for under-hood and lamp-module mounting locations |
| Shutdown Current | 10 µA; minimizes quiescent drain during lamp-off states in always-on vehicle systems |
| VO Rise Time | 12 µs (IOUT = 250 mA); ensures fast response for brake-light flash timing compliance |
Pinout & Package
AD8240YRMZ is housed in an 8-lead MSOP (RM-8) package per JEDEC MO-187AA, with 0.65 mm lead pitch and exposed pad for thermal dissipation in automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return for internal circuitry and external shunt resistor |
| 2 (5V REF) | Internal reference input | Accepts externally supplied 5 V reference to set regulated VO = 12 V |
| 3 (PWM) | Digital control input | CMOS-compatible; high = VO enabled, low = VO disabled; latches off on overcurrent |
| 4 (VSENSE) | Current-sense amplifier output | High-impedance (10 kΩ) analog output proportional to LED string current |
| 5 (VPLUS) | Main supply input | 9–27 V DC input; powers internal circuitry and drives external pass transistor |
| 6 (BASE) | Transistor drive output | 15 mA capable driver for external NPN power transistor base |
| 7 (VO) | Regulated output | 12 V constant-voltage source for LED string; current-limited and latch-protected |
| 8 (SHUNT) | High-side current sense input | Connects to shunt resistor top node; enables open-LED detection via current drop |
Key Features
| Feature | Design Value |
|---|---|
| Constant-voltage regulation | Eliminates need for per-lamp ballast resistors and enables two-wire (power + ground) LED harness reuse from incandescent systems |
| Latch-off overcurrent protection | Shuts down VO within 2 µs when shunt voltage indicates >500 mA; resets automatically on next PWM edge - no manual recovery required |
| Open-LED detection via VSENSE | 24× amplified shunt signal allows MCU to detect partial failure (e.g., 25% LED loss → 25% VSENSE drop) without added sensors |
| PWM-compatible brightness control | Operates across full 5%–95% duty cycle at ≤500 Hz - matches OEM BCM timing for brake vs. running light intensity differentiation |
| Automotive temperature rating | −40°C to +125°C operation supports placement in junction boxes, lamp housings, or BCMs without derating or heatsinking |
Applications
| Automotive Brake Lamps | Automotive Running Lamps |
|---|---|
|
Use Scenario: Center high-mounted stop lamp (CHMSL) or left/right brake lamps requiring regulatory-compliant brightness and failure reporting. IC Role / Device Role / Timing Role: Constant-voltage driver and current monitor; VO supplies 12 V to LED array while VSENSE reports real-time current to BCM for fault logging. Use Value: Enables ECE R7 or FMVSS 108 compliance by detecting ≥25% LED failure via VSENSE drop and triggering dashboard warning within one PWM cycle. |
Use Scenario: Daytime running lights (DRL) or rear position lamps operating continuously at reduced brightness. IC Role / Device Role / Timing Role: PWM-controlled driver with shutdown capability; VO active only during vehicle-on state, reducing standby current to 10 µA. Use Value: Achieves <100 µA system-level quiescent draw in sleep mode while maintaining instant-on response for DRL activation. |
| Automotive Turn Signals | Commercial Vehicle Marker Lamps |
|
Use Scenario: Front/rear turn indicators requiring flash synchronization and open-circuit detection per SAE J595. IC Role / Device Role / Timing Role: High-side current monitor feeding BCM flash controller; VSENSE drop signals filament-open condition before thermal cutoff. Use Value: Detects single-LED failure in multi-segment arrays before total outage, enabling "bulb-out" warning without added wiring or CAN messages. |
Use Scenario: Trailer marker lamps or bus side-sign lamps subject to vibration, moisture, and wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust linear driver with latch-off protection; VO sustains 12 V output despite battery transients up to 30 V. Use Value: Survives ISO 7637-2 pulse 5a (50 V/100 ms) without latch-up, eliminating need for external TVS diodes in cost-sensitive trailer modules. |
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; requires inductor; no integrated open-LED detection; 600 mA output | Higher efficiency for high-power forward lighting; lacks VSENSE analog monitoring path | Select when >85% efficiency needed and external fault reporting is acceptable |
| TLC59284PWR | 16-channel constant-current sink driver; I²C interface; no voltage regulation or latch-off | Designed for interior RGB LED control; not rated for −40°C to +125°C automotive use | Select for non-automotive, multi-zone interior lighting with digital control |
Compared with MAX16802AASA+ and TLC59284PWR, the AD8240YRMZ uniquely combines constant-voltage regulation, high-side analog current monitoring, latch-off protection, and automotive temperature rating in a single 8-pin MSOP - enabling retrofit into legacy incandescent lamp harnesses without rewiring or firmware changes.
Availability
AD8240YRMZ is available at Aetrix Electronics and suitable for automotive brake lamps, running lamps, and turn-signal modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8240YRMZ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The AD8240YRMZ belongs to Analog Devices' automotive LED driver/monitor product line, engineered specifically to replace incandescent lamp drivers in body control modules while adding open-LED diagnostics and latch-off safety - targeting regulatory-compliant exterior lighting.
FAQ
What is the primary function of the AD8240YRMZ in automotive lighting systems?
The AD8240YRMZ functions as a constant-voltage LED driver and monitor, delivering regulated 12 V output to LED lamp strings while providing real-time current feedback via its VSENSE pin. It enables open-LED detection, latch-off overcurrent protection, and PWM-controlled brightness - all critical for meeting automotive lighting regulations such as ECE R7 and FMVSS 108. The AD8240YRMZ replaces traditional incandescent lamp drivers without requiring harness changes.
How does the AD8240YRMZ implement open-LED detection?
The AD8240YRMZ uses an integrated high-side current-sense amplifier (gain = 24×, ±3% accuracy) to monitor voltage across an external shunt resistor. When LEDs fail open, load current drops proportionally, causing VSENSE to decrease linearly - e.g., 25% LED failure yields ~25% VSENSE reduction. This analog signal is fed to a microcontroller ADC or comparator for fault classification. The AD8240YRMZ does not require additional sensors or communication protocols to report partial failures.
What is the maximum output current capability of the AD8240YRMZ?
The AD8240YRMZ supports up to 500 mA output current when used with a 0.4 Ω shunt resistor and appropriate external NPN transistor. The actual current limit is set by shunt value and transistor selection: IOUT = (5 V / RSHUNT) / 24. For example, a 0.2 Ω shunt raises the limit to 1 A. The AD8240YRMZ itself does not source current directly but controls the external transistor's base to regulate the load.
Can the AD8240YRMZ operate with a supply voltage below 12.5 V?
Yes, the AD8240YRMZ accepts 9 V to 27 V on VPLUS, but regulated 12 V output (VO) requires VPLUS ≥12.5 V to overcome external transistor VBE and shunt voltage drop. Below 12.5 V, VO follows VPLUS minus losses - still functional for basic on/off control but not for precise brightness regulation. The AD8240YRMZ maintains 10 µA shutdown current and −40°C to +125°C operation across the full 9–27 V range.
What package type and footprint does the AD8240YRMZ use?
The AD8240YRMZ is packaged in an 8-lead MSOP (RM-8) per JEDEC MO-187AA, with 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, and exposed thermal pad. It shares footprint compatibility with other RM-8 devices like the AD8205 or LT6105, enabling layout reuse in automotive PCB designs. The AD8240YRMZ's pinout is optimized for high-side sensing and minimal trace length between SHUNT, GND, and VSENSE to reduce noise coupling.
AD8240YRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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
AD8240YRMZ FAQ
1.How can I place an order for AD8240YRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8240YRMZ 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 AD8240YRMZ reliable?
The price and inventory of AD8240YRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8240YRMZ is usually 5 days.
3.What payment methods are accepted for AD8240YRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8240YRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8240YRMZ?
AD8240YRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8240YRMZ 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 AD8240YRMZ?
For technical support, including AD8240YRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8240YRMZ requirements.
6.How does Aetrix verify that AD8240YRMZ is sourced from the original manufacturer or authorized distributors?
All AD8240YRMZ 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 AD8240YRMZ meets industry standards.
7.What is the process for return or replacement of AD8240YRMZ?
All AD8240YRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8240YRMZ, 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 AD8240YRMZ part is unused and in its original packaging.
Return procedure for AD8240YRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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