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Analog Devices Inc. AD8240YRMZ-R7
- Part No.:
- AD8240YRMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8240YRMZ-R7.pdf
- Description:
- IC LED DRIVER LINEAR PWM 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,062
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Product details
Overview
AD8240YRMZ-R7 from Analog Devices is a constant-voltage LED driver/monitor IC designed for automotive lamp control, featuring PWM brightness control (DC–500 Hz), open-LED detection via high-side current-sense amplifier (gain = 24), latch-off overcurrent protection, and 12 V regulated output (±1% typical at 25°C) across 13.5 V to 27 V supply range. It drives external NPN transistors in body control modules for rear lighting systems.
For engineers reviewing the AD8240YRMZ-R7 datasheet, AD8240YRMZ-R7 pinout, AD8240YRMZ-R7 application, or AD8240YRMZ-R7 equivalent, key selection criteria include its 8-lead MSOP package, 300 µA operating current, −40°C to +125°C automotive temperature range, VSENSE output impedance of ~10 kΩ, and compatibility with 0.1 Ω–0.5 Ω external shunt resistors for precise current monitoring.
Technical Context
The AD8240YRMZ-R7 integrates four functional blocks: a linear regulator (Block A) that sets VO = 12/5 × 5 V reference; a high-side current-sense amplifier (Block B) with 24× gain and ±3% accuracy for open-LED detection; a comparator (Block C) that latches off VO when VSENSE exceeds 5 V reference; and an intelligent driver (Block D) that level-shifts PWM input to control external transistor base drive.
It operates as a two-wire (power + ground) solution for LED lamp driving and monitoring-eliminating need for dedicated sense wiring-by measuring load current through an external shunt and amplifying the voltage drop for microcontroller ADC or comparator interfacing. Latch-off resets automatically on next PWM low-to-high transition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12 V regulated (±1% typical at 25°C); set by internal 5 V reference and resistor divider ratio |
| Supply Range | 9 V to 27 V continuous; supports automotive battery variations including cold-crank and load-dump conditions |
| VSENSE Gain & Accuracy | 24× gain with ±3% accuracy; enables precise LED current measurement for partial-failure detection |
| PWM Control Range | DC to 500 Hz frequency; 5%–95% duty cycle supports running/brake light dimming profiles |
| Operating Current | 360 µA typical at VPLUS > 13 V; minimizes quiescent power draw in always-on vehicle modules |
| Temperature Range | −40°C to +125°C; qualified for under-hood and trunk-mounted automotive body control applications |
| Overcurrent Response | Latch-off triggered when VSENSE ≥ 5 V; delay < 2 µs; reset via PWM cycle-no external reset required |
Pinout & Package
AD8240YRMZ-R7 is housed in an 8-lead Mini Small Outline Package (MSOP, RM-8), JEDEC MO-187AA compliant, with 0.65 mm lead pitch and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return for internal circuitry and external shunt; must be low-impedance chassis connection |
| 2 (5V REF) | Internal reference voltage source | Provides stable 5 V ±1% reference for VO regulation and comparator threshold; supplies 160–240 µA |
| 3 (PWM) | Digital control input | CMOS-compatible; turns VO on/off with 3.5 V turn-on / 1.4 V turn-off thresholds; supports PWM dimming |
| 4 (VSENSE) | Current-sense amplifier output | High-impedance (10 kΩ) analog output proportional to LED current; requires buffering for <100 kΩ loads |
| 5 (VPLUS) | Main supply input | Accepts 9–27 V; powers all internal blocks and external transistor base drive (15 mA max) |
| 6 (BASE) | External transistor driver output | Level-shifted, current-limited drive signal for NPN pass transistor base; not directly connected to load |
| 7 (VO) | Regulated output | 12 V constant-voltage output delivered to LED string via external transistor; current-limited and latched on overcurrent |
| 8 (SHUNT) | High-side current sense input | Connects to high side of external shunt resistor; enables open-LED detection without shared-ground interference |
Key Features
| Feature | Design Value |
|---|---|
| PWM-controlled brightness | Enables dynamic dimming (e.g., 5% for tail lights, 95% for brake lights) without external modulators or DACs |
| Open-LED detection | Measures real-time LED current via high-side shunt sensing-detects partial failures down to ~10% LED loss |
| Latch-off overcurrent protection | Prevents wiring damage during short circuits by disabling VO until next PWM edge-no external fault latch needed |
| Constant-voltage regulation | Eliminates need for per-lamp ballast resistors or complex current sources-reduces BOM count and harness cost |
| Automotive-grade thermal range | Operates reliably from −40°C to +125°C ambient-qualified for direct mounting in body control modules |
Applications
| Rear Brake Lamp Control | Turn Signal Monitoring |
|---|---|
Use Scenario: Driving dual-function LED arrays where same physical lamp serves as both brake and tail light, requiring independent brightness control and failure reporting. IC Role / Device Role / Timing Role: Constant-voltage driver and current monitor; regulates 12 V output while feeding VSENSE to MCU ADC for real-time current profiling. Use Value: Enables compliance with FMVSS 108 brightness thresholds and detects partial LED failure before regulatory nonconformance occurs. |
Use Scenario: Monitoring left/right turn signal lamps for open-circuit faults in vehicles with CAN-based body control units. IC Role / Device Role / Timing Role: High-side current sensor and latch-off protector; provides VSENSE voltage proportional to lamp current for MCU-based fault classification. Use Value: Detects single-LED opens in multi-LED turn signals-meeting UNECE R6 and SAE J1390 requirements for blinker functionality verification. |
| Running Light Management | Center High-Mount Stop Lamp (CHMSL) |
Use Scenario: Powering and monitoring LED running lamps subject to long-duration operation and thermal cycling in exterior modules. IC Role / Device Role / Timing Role: Linear LED driver with shutdown current of 10 µA; enters ultra-low-power state when PWM is low. Use Value: Reduces parasitic drain on vehicle battery during parking mode while retaining fast wake-up capability for instant illumination. |
Use Scenario: Controlling third-brake-light arrays mounted on vehicle hatchbacks, where space constraints limit heat dissipation. IC Role / Device Role / Timing Role: External-transistor driver with 12 V regulated output; shifts power dissipation to discrete NPN device outside IC package. Use Value: Avoids thermal derating inside compact ECUs-enables full 500 mA output capability without heatsinking the AD8240YRMZ-R7 itself. |
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 LED driver with integrated MOSFET; 3–28 V input; no built-in open-LED detection | Higher efficiency but requires external current-sense and fault logic; unsuitable for two-wire retrofit | Select when system-level efficiency >85% is mandatory and PCB area allows added components |
| TLC59282DBQR | 16-channel constant-current LED sink driver; I²C interface; 3–5.5 V supply only | Designed for interior RGB displays-not rated for 12 V automotive loads or −40°C operation | Select only for low-voltage, multi-segment interior lighting with digital control requirements |
Compared with MAX16802AASA+ and TLC59282DBQR, the AD8240YRMZ-R7 uniquely combines constant-voltage regulation, high-side current sensing, and latch-off protection in a single automotive-qualified MSOP package-making it the only option supporting direct incandescent-to-LED lamp harness reuse without added wiring or modules.
Availability
AD8240YRMZ-R7 is available at Aetrix Electronics and suitable for automotive rear lighting systems, body control module upgrades, and LED retrofit programs requiring stable component supply, AEC-Q100 alignment, and long-term lifecycle support.
Supply support for AD8240YRMZ-R7 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 AD8240YRMZ-R7 belongs to Analog Devices' automotive LED driver/monitor product line, engineered specifically to replace incandescent lamp drivers in body control modules while enabling regulatory-compliant LED failure detection and two-wire harness compatibility.
FAQ
What is the function of the SHUNT pin on the AD8240YRMZ-R7?
The SHUNT pin on the AD8240YRMZ-R7 connects to the high-side terminal of an external current-sense resistor, enabling open-LED detection without interference from shared ground paths. It feeds the high-side current-sense amplifier (Block B), which outputs a 24× amplified voltage on VSENSE proportional to LED current-allowing precise monitoring of partial failures in multi-LED strings.
Does the AD8240YRMZ-R7 require an external transistor, and why?
Yes, the AD8240YRMZ-R7 requires an external NPN transistor connected between VO and the LED load. Its BASE pin delivers up to 15 mA of level-shifted drive current to the transistor's base, shifting power dissipation away from the IC. This architecture allows the AD8240YRMZ-R7 to remain in a small MSOP package while supporting up to 500 mA LED current-critical for thermal management in space-constrained automotive modules.
How does the AD8240YRMZ-R7 implement latch-off overcurrent protection?
The AD8240YRMZ-R7 implements latch-off overcurrent protection by comparing the VSENSE output against the internal 5 V reference using an internal comparator (Block C). When VSENSE exceeds ~0.1 V above the reference (i.e., >5.1 V), the comparator triggers and disables the BASE driver output. The latch resets automatically on the next rising edge of the PWM signal-no external reset circuitry is needed.
Can the AD8240YRMZ-R7 operate with a supply voltage below 12.5 V?
Yes, the AD8240YRMZ-R7 can operate with VPLUS as low as 9 V, but regulated 12 V output (VO) is only maintained when VPLUS is ≥12.5 V. Below that, VO follows VPLUS minus transistor VBE and shunt drop-making it suitable for undervoltage detection or fail-safe modes, but not for constant-brightness LED driving. Full regulation resumes once VPLUS rises above 12.5 V.
What is the recommended shunt resistor value for a 400 mA LED load using the AD8240YRMZ-R7?
For a 400 mA LED load, the recommended shunt resistor value is ≤0.33 Ω-calculated using the design rule RSHUNT ≤ 2.0 V / ILOAD. At 400 mA, this yields 0.33 Ω, ensuring VSENSE stays ≤4.8 V (24 × 0.4 A × 0.33 Ω) during normal operation-well below the 5 V latch-off threshold and providing margin against noise-induced false trips.
AD8240YRMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-R7 FAQ
1.How can I place an order for AD8240YRMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8240YRMZ-R7 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-R7 reliable?
The price and inventory of AD8240YRMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8240YRMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8240YRMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8240YRMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8240YRMZ-R7?
AD8240YRMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8240YRMZ-R7 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-R7?
For technical support, including AD8240YRMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8240YRMZ-R7 requirements.
6.How does Aetrix verify that AD8240YRMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8240YRMZ-R7 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-R7 meets industry standards.
7.What is the process for return or replacement of AD8240YRMZ-R7?
All AD8240YRMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8240YRMZ-R7, 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-R7 part is unused and in its original packaging.
Return procedure for AD8240YRMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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