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Analog Devices Inc./Maxim Integrated MAX25605ATP/VY+T
- Part No.:
- MAX25605ATP/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX25605ATP/VY+T.pdf
- Description:
- SEQUENTIAL TURN CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:1,970
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Product details
Overview
MAX25605ATP/VY+T from Maxim Integrated is a six-channel automotive sequential LED controller implementing hardware-based turn-signal animation without microcontroller or firmware. It integrates six cascoded n-channel MOSFETs (RDS(ON) = 0.2 Ω), supports up to 750mA per switch, handles up to three series LEDs per channel, and operates across 4.0V–60V input with AEC-Q100 qualification for under-hood lighting systems.
For engineers reviewing the MAX25605ATP/VY+T datasheet, MAX25605ATP/VY+T pinout, MAX25605ATP/VY+T application, or MAX25605ATP/VY+T equivalent, key selection considerations include resistor-programmable sequence timing (tSEQ = 9.8–52.5 ms), single-LED fault detection (open/short/open-trace), logarithmic fade capability, SYNC-driven multi-device chaining (up to 16 units), and side-wettable 4mm×4mm TQFN-20 package compatibility with automotive thermal requirements.
Technical Context
The MAX25605ATP/VY+T implements a resistor-configured state machine driving six cascoded n-channel MOSFETs in two independent groups of three, enabling either single-string (DR1–DR6 cascaded) or dual-string (DR1–DR3 + SRC4–DR6) topologies. Its internal charge pump (16.384 MHz spread-spectrum oscillator, 3.8–5.8 V output) powers gate drivers and level shifters, supporting buck-boost, boost-to-battery, and ground-referenced LED driver configurations.
Sequencing logic samples A0/A1/A2 at power-up to configure dimming direction, fade duration, short-LED threshold (1.26–8.47 V), and multi-device position; CLK sets tSEQ continuously during operation. EN serves as bidirectional enable/fault-ready indicator, releasing only after charge-pump regulation, while FLT asserts open-drain fault on thermal shutdown, LED open/short, or trace discontinuity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0 V to 60 V - supports direct battery connection (12 V/24 V systems) and high-side LED string configurations. |
| Max Switch Current | 750 mA per channel - enables high-brightness automotive LED segments without external current amplification. |
| RDS(ON) | 0.2 Ω typical - minimizes conduction loss and thermal rise in each MOSFET switch under full load. |
| tSEQ Range | 9.8 ms to 52.5 ms - programmable via CLK resistor for precise control of turn-signal sweep speed (e.g., 120 ms total for 6-step hazard). |
| Fault Detection | Per-switch open/short/open-trace - detects single-LED failure or wiring break without requiring external sense resistors or ADC. |
| Operating Temp | −40 °C to +125 °C - qualified per AEC-Q100 Grade 0, suitable for engine compartment and exterior lamp housing environments. |
| Package | 20-pin 4 mm × 4 mm side-wettable TQFN (T2044Y+3C) - enables automated optical inspection (AOI) and robust solder joint reliability in automotive reflow. |
Pinout & Package
MAX25605ATP/VY+T is housed in a 20-pin 4 mm × 4 mm side-wettable TQFN package (package code T2044Y+3C) with exposed pad (EP) thermally connected to PCB ground plane. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Primary power input | Accepts 4.0–60 V supply; requires ≥0.1 µF ceramic decoupling close to pin for stability and EMI suppression. |
| VDD | Internal 1.8 V LDO output | Powers logic core; requires ≥2.2 µF ceramic capacitor to GND for UVLO immunity and transient response. |
| EN | Bidirectional enable/fault-ready signal | Pulled low internally until charge pump regulates; released high indicates system readiness; pulling low disables all switches for emergency full-brightness mode. |
| FLT | Open-drain fault flag | Asserts low on thermal shutdown, LED open/short, or open-trace fault; requires external pull-up for host MCU monitoring. |
| SYNC | Open-drain synchronization I/O | Wired-AND connection across multiple MAX25605 devices enables synchronized 12+ segment animations without master clock. |
| A0/A1/A2 | Configuration programming inputs | Resistor-connected to GND to set dimming direction, fade duration, short-LED threshold, and device position in multi-unit chain. |
| CLK | Sequence period programming input | Resistor-to-GND sets tSEQ (9.8–52.5 ms); continuous sampling allows runtime adjustment without reset. |
| DR1–DR6 | Drain terminals of internal MOSFETs | Connect to LED anodes or cathodes depending on topology; support floating-source operation for non-ground-referenced strings. |
| SRC1/SRC4 | Source terminals of internal MOSFET groups | SRC1 anchors first group (DR1–DR3); SRC4 anchors second group (DR4–DR6); external connection enables single-string cascade. |
| CPP/CPN | Charge-pump capacitor interface | Requires 0.1 µF ceramic capacitor between pins; supplies gate drive voltage for all six MOSFETs and level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable sequencing | Eliminates firmware dependency: A0/A1/A2/CLK resistors configure timing, direction, fade, and fault thresholds without MCU or flash memory. |
| Logarithmic LED fade | Provides perceptually smooth on/off transitions by approximating human eye response-reducing visual jarring in turn-signal applications. |
| Multi-device synchronization | SYNC pin enables daisy-chained coordination of up to 16 MAX25605ATP/VY+T units for extended light bars or full-vehicle animations without timing skew. |
| Single-LED fault isolation | Detects open-circuit, short-circuit, or open-trace condition on each of six channels independently-enabling fail-safe diagnostics per segment. |
| Spread-spectrum charge pump | 16.384 MHz oscillator with ±6% frequency dither reduces EMI peak emissions, easing compliance with CISPR 25 Class 5 automotive EMC requirements. |
Applications
| Sequential Turn Signal Lights | Hazard Light Systems |
|---|---|
|
Use Scenario: Front/rear turn indicators on passenger vehicles requiring SAE J575-compliant sweep animation. IC Role / Device Role / Timing Role: Hardware sequencer controlling six discrete LED segments in timed cascade; replaces MCU + driver IC stack. Use Value: Meets OEM animation timing specs (e.g., 120 ms full sweep) with zero software overhead, deterministic latency, and AEC-Q100 reliability. |
Use Scenario: Simultaneous activation of all turn-signal LEDs during emergency hazard mode. IC Role / Device Role / Timing Role: EN pin pulled low forces all six MOSFETs open, routing full current through entire LED string for maximum brightness. Use Value: Achieves instant, glitch-free hazard activation without firmware intervention or timing recalibration. |
| Hardware-Based Lighting Animation | Multi-String Exterior Lighting |
|
Use Scenario: Dynamic welcome/exit lighting sequences on door handles or grilles using fixed-pattern LED strips. IC Role / Device Role / Timing Role: Standalone sequencer generating repeatable animations (e.g., inward/outward sweep) via resistor configuration only. Use Value: Enables cost-sensitive designs where adding a microcontroller would increase BOM, layout area, and validation effort. |
Use Scenario: Dual-row rear combination lamps (brake + turn) requiring independent control of upper/lower LED strings. IC Role / Device Role / Timing Role: Two-group MOSFET architecture (DR1–DR3 + SRC4–DR6) drives separate strings with shared timing logic. Use Value: Reduces component count vs. two discrete controllers-single IC manages both functions with matched timing and fault reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sequential LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25604ATP/VY+T | Four-channel version with identical pinout, programming interface, and fault detection-but lacks DR5/DR6 and SRC4, limiting to 4-segment sequences. | Suitable for compact turn-signal modules with ≤4 LED segments; cannot scale to 6+ segments or dual-string topologies. | Select MAX25604ATP/VY+T only when segment count is strictly ≤4 and board space or cost constraints outweigh need for expandability. |
| TPS92692QPWPRQ1 | Two-channel analog LED controller with integrated boost converter; requires external PWM or I²C for sequencing-no built-in hardware sequencer. | Demands external MCU or timing circuitry to generate sequential patterns; adds design complexity and validation burden. | Choose TPS92692QPWPRQ1 only when system already includes a capable MCU and flexible power architecture justifies added firmware development. |
Compared with MAX25604ATP/VY+T and TPS92692QPWPRQ1, the MAX25605ATP/VY+T uniquely delivers six-channel hardware sequencing in a single AEC-Q100 package-eliminating software dependencies, reducing bill-of-materials, and enabling deterministic, scalable animations for modern automotive lighting.
Availability
MAX25605ATP/VY+T is available at Aetrix Electronics and suitable for sequential turn signal lights, hazard light systems, hardware-based lighting animation, and multi-string exterior lighting requiring stable component supply across automotive production lifecycles.
Supply support for MAX25605ATP/VY+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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets-with emphasis on high-reliability, AEC-Q100-qualified solutions.
The MAX25605ATP/VY+T belongs to Maxim's automotive LED driver portfolio, engineered specifically for contactless, microcontroller-free sequential lighting control in safety-critical exterior lighting applications.
FAQ
What is the function of the EN pin on the MAX25605ATP/VY+T?
The EN pin on the MAX25605ATP/VY+T serves a dual role: it acts as both an enable input and an open-drain status output. During startup, the device pulls EN low until the internal charge pump reaches regulation, signaling readiness. When released high, sequencing begins; pulling EN low externally forces all six MOSFETs open for emergency full-brightness LED operation. The MAX25605ATP/VY+T also disables fault detection while EN is held low, as fault algorithms require switch transitions to operate.
How is sequence timing programmed on the MAX25605ATP/VY+T?
Sequence timing on the MAX25605ATP/VY+T is set via the CLK pin using an external resistor to GND. The resistor value determines tSEQ (single-step period) according to RCLK = (tSEQ − 0.17)/1.045 (RCLK in kΩ, tSEQ in ms), yielding programmable ranges from 9.8 ms to 52.5 ms. Unlike A0/A1/A2, CLK is sampled continuously-allowing real-time adjustment without power cycle. Total animation time equals tSEQ × number of steps (e.g., 6 × 16 ms = 96 ms for full sweep).
Does the MAX25605ATP/VY+T support dual LED string configurations?
Yes, the MAX25605ATP/VY+T supports dual LED string configurations by leveraging its two independent MOSFET groups: DR1–DR3 (Group 1) and SRC4–DR6 (Group 2). Each group can drive a separate LED string with synchronized timing. External connection of SRC4 to DR3 enables single-string operation; leaving them isolated allows independent control. This architecture lets one MAX25605ATP/VY+T manage both brake and turn functions in rear lamps-reducing component count versus dual-controller solutions.
What fault conditions does the MAX25605ATP/VY+T detect per channel?
The MAX25605ATP/VY+T performs per-channel fault detection on all six switches, identifying open LEDs (via VOTH = 12.5–15 V threshold), shorted LEDs (via programmable VSTH = 1.26–8.47 V), and open traces (via ILED_MIN = 45–100 mA minimum current detection). Faults assert the open-drain FLT pin low and halt sequencing. Detection occurs only when EN is high-ensuring reliable diagnosis during active operation. The MAX25605ATP/VY+T reports aggregate faults without channel identification; external logic must correlate FLT assertion with timing state.
Is the MAX25605ATP/VY+T compatible with ground-referenced and floating LED topologies?
Yes, the MAX25605ATP/VY+T supports both ground-referenced and floating LED topologies due to its cascoded n-channel MOSFET architecture and floating source terminals (SRC1, SRC4). In ground-referenced mode, LED cathodes connect to GND and DRx drive anodes. In floating mode, the entire LED string is isolated-enabling high-side switching where the string cathode connects to DRx and anodes tie to higher voltage rails. This flexibility allows integration into buck, boost-to-battery, and buck-boost LED driver systems without topology redesign.
MAX25605ATP/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 4V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 3.8V ~ 5.8V
- Current - Output / Channel:
- 750mA
- Frequency:
- 16.384MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-TQFN-EP (4x4)
MAX25605ATP/VY+T FAQ
1.How can I place an order for MAX25605ATP/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25605ATP/VY+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 MAX25605ATP/VY+T reliable?
The price and inventory of MAX25605ATP/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25605ATP/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25605ATP/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25605ATP/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25605ATP/VY+T?
MAX25605ATP/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25605ATP/VY+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 MAX25605ATP/VY+T?
For technical support, including MAX25605ATP/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25605ATP/VY+T requirements.
6.How does Aetrix verify that MAX25605ATP/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25605ATP/VY+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 MAX25605ATP/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25605ATP/VY+T?
All MAX25605ATP/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25605ATP/VY+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 MAX25605ATP/VY+T part is unused and in its original packaging.
Return procedure for MAX25605ATP/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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