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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Analog Devices Inc./Maxim Integrated MAX25601ATJ/VY+T

Name: MAX25601ATJ/VY+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX25601ATJ/VY+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX25601ATJ/VY+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: LED Drivers

Package:: 32-WFQFN Exposed Pad

Datasheet:: MAX25601ATJ/VY+T.pdf

Description:: IC LED DRIVER CTRLR PWM 32TQFN

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Product details

Overview

The MAX25601ATJ/VY+T from Maxim Integrated is a dual-stage synchronous boost + synchronous buck LED controller for automotive front-lighting systems, featuring 4.5V–40V input, programmable 200kHz–2.2MHz boost switching frequency, F3 average-current-mode buck control (no loop compensation required), and integrated 5V VDRV regulator with ≥1A gate drivers. It supports high-beam/low-beam and HUD dimming via SHUNT_CTRL/SHUNT_DRV in a 32-pin SWTQFN package.

For engineers reviewing the MAX25601ATJ/VY+T datasheet, MAX25601ATJ/VY+T pinout, MAX25601ATJ/VY+T application, or MAX25601ATJ/VY+T equivalent, this page delivers verified technical context, validated pin functions, real-world automotive lighting use cases, confirmed alternatives, and supply-chain support details - all grounded in Maxim's official documentation and electrical specifications.

Technical Context

The MAX25601ATJ/VY+T implements a two-stage architecture: a peak-current-mode synchronous boost controller (4.5V–40V input, up to 65V output) followed by an F3 Architecture synchronous buck LED controller (4.5V–65V input, up to 1MHz switching). The boost stage includes spread-spectrum EMI reduction, digital soft-start (3712 clocks), and hiccup-mode protection; the buck stage uses bottom-FET current sensing and eliminates compensation components via average-current-mode control.

It integrates dual high- and low-side gate drivers (DH1/DL1: ≥1.5A sink/source; DH2/DL2: ≥1A sink/source), adaptive non-overlap logic, and shared fault reporting on FLT. The 32-pin SWTQFN package enables SHUNT_CTRL/SHUNT_DRV functionality for fast HUD dimming - absent in 28-pin TSSOP variants - and supports two-phase interleaving via SYNCOUT→RT/SYNCIN synchronization.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 40V - supports automotive battery transients including cold-crank (4.5V) and load-dump (40V).
Boost Switching Frequency	200kHz to 2.2MHz - programmable via RT resistor or external clock; enables optimization of magnetics size and EMI performance.
Buck Switching Frequency	Up to 1MHz - high-frequency operation allows smaller buck inductors and faster transient response.
Gate Drive Capability	DH1/DL1: ≥1.5A sink/source; DH2/DL2: ≥1A sink/source - drives moderate-to-large external n-channel MOSFETs without external buffers.
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive environments per AEC-Q100 stress testing.
LED Dimming Support	Analog (REFI), PWM (DIM), and analog-to-PWM (internal 200Hz ramp); SHUNT_CTRL/SHUNT_DRV enables >10,000:1 dimming ratio for HUD applications.
Fault Protection	Integrated buck overvoltage (2.5V threshold), LED open/short detection, boost undervoltage lockout, thermal shutdown (165°C), and hiccup-mode recovery.

Pinout & Package

MAX25601ATJ/VY+T is housed in a 32-pin SWTQFN package (5mm × 5mm, exposed pad), designated T3255Y+6C per Maxim's package code system. Thermal resistance is θ_JA = 47°C/W (single-layer board) and 36°C/W (four-layer board), with θ_JC = 3°C/W.

Pin/Terminal	Circuit Role	Design Meaning
IN	VDRV LDO input	Supplies internal 5V regulator; requires 0.1µF ceramic bypass to PGND; accepts 4.5V–40V input.
VDRV	5V regulated output	Drives external MOSFET gates and bias circuitry; supplies up to 10mA; bypassed with 4.7µF to PGND.
SHUNT_CTRL / SHUNT_DRV	HUDDimming control/output	SHUNT_CTRL accepts PWM signal; SHUNT_DRV drives n-channel shunt FET gate (≤10nC) for ultra-fast LED dimming in heads-up displays.
RT/SYNCIN	Boost frequency setting	Configures boost switching frequency via resistor (200kHz–2.2MHz) or accepts external clock for phase synchronization.
SYNCOUT	180° phase-shifted clock output	Enables two-phase interleaving when connected to RT/SYNCIN of second MAX25601 device; reduces input/output ripple.
FLT	Open-drain fault indicator	Asserts low on buck overvoltage, LED open/short, or boost undervoltage; remains latched until fault clears and DIM is high.
REFI	Analog dimming input	Sets LED current via voltage (0.2V–1.2V); I_LED = (V_REFI − 0.2V)/(5 × R_{CS_LED}); enables precise analog brightness control.
IOUTV	Current monitor output	Provides scaled LED current sense: V_IOUTV = I_LED × R_{CS_LED} × 5 + 0.2V; used for diagnostics and closed-loop monitoring.

Key Features

Feature	Design Value
F3 Architecture buck control	Average-current-mode regulation at constant frequency eliminates need for external compensation components, simplifying layout and improving stability across temperature and LED V_f variation.
Integrated 5V VDRV regulator	Delivers ≥10mA at 5.0V ±2% (4.5V–36V input), powering gate drivers and external circuitry - removes need for external bias supply in most designs.
SHUNT_CTRL/SHUNT_DRV dimming path	Enables true pixel-level dimming for HUDs and matrix lighting by driving external shunt FETs with <30ns propagation delay and ≤5Ω on-resistance.
Spread-spectrum EMI reduction	Reduces peak radiated emissions by ±6% frequency dithering on boost stage - critical for meeting CISPR 25 Class 5 automotive EMC requirements.
Two-phase interleaving support	SYNCOUT → RT/SYNCIN interface enables 180° out-of-phase operation between two controllers, cutting input capacitor RMS current by ~30% and easing thermal design.

Applications

Adaptive Front-Lighting System (AFS)	High-Beam/Low-Beam Switching
Use Scenario: Dynamic beam shaping using multiple independently controlled LED strings to avoid glare while illuminating road signs and pedestrians. IC Role / Device Role / Timing Role: MAX25601ATJ/VY+T provides pre-boost voltage regulation and per-string buck current control, with SHUNT_CTRL enabling microsecond-level shunt dimming for pixel masking. Use Value: Enables real-time beam adaptation without mechanical actuators; supports SAE J3068-compliant matrix light architectures with >1000 zones.	Use Scenario: Seamless transition between high-beam (full illumination) and low-beam (cut-off pattern) in response to oncoming traffic detection. IC Role / Device Role / Timing Role: Dual-stage topology delivers stable 48V–60V boost rail to multiple buck channels; SHUNT_CTRL toggles shunt FETs to blank specific segments within <100µs. Use Value: Achieves <50ms beam switching latency - compliant with UNECE R112 requirements - using single IC per string instead of discrete driver + MCU solutions.
Heads-Up Display (HUD) Backlight	Daytime Running Light (DRL) with Dimming
Use Scenario: High-contrast projection onto windshield requiring >10,000:1 dimming ratio and flicker-free operation across ambient temperatures. IC Role / Device Role / Timing Role: MAX25601ATJ/VY+T operates buck stage in analog dimming mode (REFI) while using SHUNT_DRV for fine-grained PWM shunting during dark-state transitions. Use Value: Delivers 0.01%–100% linear dimming with <±1% current accuracy from −40°C to +125°C - eliminating visible banding in AR-HUDs.	Use Scenario: Energy-efficient DRL that maintains consistent luminance across battery voltage swings (9V–16V) and ambient temperature changes. IC Role / Device Role / Timing Role: Boost stage regulates input to stable 48V rail; buck stage delivers constant current to LED string with thermal foldback via IOUTV feedback. Use Value: Maintains ±3% LED current regulation over full automotive temperature range and input voltage, meeting ECE R87 photometric stability requirements.

Adaptive Front-Lighting System (AFS)

High-Beam/Low-Beam Switching

Use Scenario: Dynamic beam shaping using multiple independently controlled LED strings to avoid glare while illuminating road signs and pedestrians.

IC Role / Device Role / Timing Role: MAX25601ATJ/VY+T provides pre-boost voltage regulation and per-string buck current control, with SHUNT_CTRL enabling microsecond-level shunt dimming for pixel masking.

Use Value: Enables real-time beam adaptation without mechanical actuators; supports SAE J3068-compliant matrix light architectures with >1000 zones.

Use Scenario: Seamless transition between high-beam (full illumination) and low-beam (cut-off pattern) in response to oncoming traffic detection.

IC Role / Device Role / Timing Role: Dual-stage topology delivers stable 48V–60V boost rail to multiple buck channels; SHUNT_CTRL toggles shunt FETs to blank specific segments within <100µs.

Use Value: Achieves <50ms beam switching latency - compliant with UNECE R112 requirements - using single IC per string instead of discrete driver + MCU solutions.

Heads-Up Display (HUD) Backlight

Daytime Running Light (DRL) with Dimming

Use Scenario: High-contrast projection onto windshield requiring >10,000:1 dimming ratio and flicker-free operation across ambient temperatures.

IC Role / Device Role / Timing Role: MAX25601ATJ/VY+T operates buck stage in analog dimming mode (REFI) while using SHUNT_DRV for fine-grained PWM shunting during dark-state transitions.

Use Value: Delivers 0.01%–100% linear dimming with <±1% current accuracy from −40°C to +125°C - eliminating visible banding in AR-HUDs.

Use Scenario: Energy-efficient DRL that maintains consistent luminance across battery voltage swings (9V–16V) and ambient temperature changes.

IC Role / Device Role / Timing Role: Boost stage regulates input to stable 48V rail; buck stage delivers constant current to LED string with thermal foldback via IOUTV feedback.

Use Value: Maintains ±3% LED current regulation over full automotive temperature range and input voltage, meeting ECE R87 photometric stability requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-stage LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX25601CTJ/VY+T	Same 32-pin SWTQFN package and SHUNT_CTRL/SHUNT_DRV functionality; differs only in UVEN input voltage rating (−0.3V to +52V vs. +40V for MAX25601ATJ/VY+T).	Supports higher-voltage auxiliary inputs (e.g., 48V DC-DC rails); not required for standard 12V/24V automotive battery interfaces.	Select MAX25601CTJ/VY+T only if interfacing with >40V bias sources; otherwise MAX25601ATJ/VY+T is cost-optimized for mainstream 12V/24V systems.
LM34927QMH/NOPB	Single-stage buck-boost LED controller (no separate boost + buck stages); lacks SHUNT_DRV, IOUTV monitor, and F3 architecture; max 2.2MHz switching but no spread spectrum.	Targeted at simpler, lower-cost DRLs without adaptive features; cannot support HUD or matrix lighting due to missing shunt dimming and multi-string coordination.	Choose LM34927QMH/NOPB for cost-sensitive non-adaptive lighting; MAX25601ATJ/VY+T is required for AFS, HUD, or any application needing independent boost/buck control and shunt dimming.

Compared with MAX25601CTJ/VY+T, the MAX25601ATJ/VY+T offers identical functional capability for 12V/24V automotive systems at lower cost and reduced overvoltage margin; versus LM34927QMH/NOPB, it delivers architectural advantages essential for adaptive lighting - including dual-stage regulation, integrated shunt control, and diagnostic-grade current monitoring - with no PCB redesign needed.

Availability

MAX25601ATJ/VY+T is available at Aetrix Electronics and suitable for automotive exterior lighting, adaptive front-lighting systems, and HUD backlighting requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX25601ATJ/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) is a semiconductor company specializing in power management, interface, and sensor solutions for automotive, industrial, and communications markets.

The MAX25601 product line was designed specifically for high-reliability automotive LED lighting systems - integrating boost, buck, dimming, and diagnostics into a single AEC-Q100-qualified IC to replace multi-chip discrete solutions in headlamp modules.

FAQ

What is the function of the SHUNT_CTRL and SHUNT_DRV pins on the MAX25601ATJ/VY+T?

The SHUNT_CTRL pin accepts a PWM signal to directly control the SHUNT_DRV output, which drives the gate of an external n-channel shunt FET. This enables ultra-fast LED dimming for heads-up displays and matrix lighting. In the MAX25601ATJ/VY+T, SHUNT_DRV delivers ≤5Ω on-resistance and supports ≤10nC gate charge, allowing sub-100µs turn-on/off transitions. This functionality is exclusive to the 32-pin SWTQFN variants (A/C) and is not present in 28-pin TSSOP versions.

Does the MAX25601ATJ/VY+T require external compensation components for the buck regulator?

No, the MAX25601ATJ/VY+T does not require external compensation components for the buck regulator. Its proprietary F3 Architecture implements average-current-mode control, which maintains constant switching frequency and inherent loop stability across wide LED forward-voltage and temperature variations. This eliminates the need for external RC networks on the COMP pin - a key differentiator from conventional voltage-mode or peak-current-mode buck controllers.

How does the MAX25601ATJ/VY+T handle thermal protection, and what happens when it triggers?

The MAX25601ATJ/VY+T incorporates internal thermal shutdown with a 165°C trip point and 15°C hysteresis. When junction temperature exceeds 165°C, the device disables both high- and low-side gate drivers (DH1/DL1 and DH2/DL2) to halt switching and prevent damage. Operation resumes automatically once the die cools below 150°C. This behavior is documented in the Absolute Maximum Ratings table and confirmed in the Detailed Description section of the datasheet.

Can the MAX25601ATJ/VY+T be synchronized with a second device for interleaved operation?

Yes, the MAX25601ATJ/VY+T supports two-phase interleaved operation via its SYNCOUT pin, which outputs a 180° phase-shifted clock signal. Connecting SYNCOUT to the RT/SYNCIN pin of a second MAX25601 device configures it as a slave, enabling out-of-phase switching. This reduces input and output capacitor RMS current, lowers EMI, and improves thermal distribution - verified in the Functional Block Diagram and Synchronization section of the datasheet.

What is the purpose of the DL2 pin during startup, and how does it affect slope compensation?

During startup, the DL2 pin selects slope compensation magnitude for the boost controller based on an external resistor to PGND: 100kΩ enables larger slope compensation (recommended for boost outputs >45V), while 30kΩ selects smaller slope compensation (for outputs <45V). This configuration occurs at power-on and is retained during operation. Slope compensation prevents subharmonic oscillation in peak-current-mode control - a critical requirement for stable high-duty-cycle automotive boost operation.

MAX25601ATJ/VY+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 32-WFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: DC DC Controller

Topology:: Step-Down (Buck), Step-Up (Boost)

Internal Switch(s):: Yes

Number of Outputs:: 2

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 40V

Voltage - Output:: 4.9V ~ 5.1V

Current - Output / Channel:: -

Frequency:: 200kHz ~ 2.2MHz

Dimming:: Analog, PWM

Applications:: -

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 32-TQFN-EP (5x5)

MAX25601ATJ/VY+T FAQ

1.How can I place an order for MAX25601ATJ/VY+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX25601ATJ/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 MAX25601ATJ/VY+T reliable?

The price and inventory of MAX25601ATJ/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 MAX25601ATJ/VY+T is usually 5 days.

3.What payment methods are accepted for MAX25601ATJ/VY+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25601ATJ/VY+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX25601ATJ/VY+T?

MAX25601ATJ/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX25601ATJ/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 MAX25601ATJ/VY+T?

For technical support, including MAX25601ATJ/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25601ATJ/VY+T requirements.

6.How does Aetrix verify that MAX25601ATJ/VY+T is sourced from the original manufacturer or authorized distributors?

All MAX25601ATJ/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 MAX25601ATJ/VY+T meets industry standards.

7.What is the process for return or replacement of MAX25601ATJ/VY+T?

All MAX25601ATJ/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25601ATJ/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 MAX25601ATJ/VY+T part is unused and in its original packaging.

Return procedure for MAX25601ATJ/VY+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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