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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching ControllersMAX20412ATJD/V+
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MAX20412ATJD/V+ - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
MAX20412ATJD/V+
Manufacturer
Maxim Integrated
Allelco Part Number
98D-MAX20412ATJD/V+
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
37,152 pcs available, New & Original
Parts Description
DUAL CHANNEL BUCK CONTROLLER FOR
Package
20-TQFN (5x5)
Data sheet
MAX20412ATJD/V+.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 37152
  • Unit Price: $7.132
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $7.132 $7.13
200+ $2.76 $552.00
500+ $2.664 $1,332.00
1000+ $2.616 $2,616.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

MAX20412ATJD/V+ Tech Specifications
Analog Devices Inc./Maxim Integrated - MAX20412ATJD/V+ technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - MAX20412ATJD/V+

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Voltage - Supply (Vcc/Vdd) 3V ~ 5.5V
Topology Buck
Synchronous Rectifier Yes
Supplier Device Package 20-TQFN (5x5)
Series Automotive, AEC-Q100
Serial Interfaces I²C
Package / Case 20-WQFN Exposed Pad
Package Strip
Output Type PWM
Output Phases 2
Product Attribute Attribute Value
Output Configuration Positive
Operating Temperature -40°C ~ 125°C
Number of Outputs 2
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching 2.2MHz
Duty Cycle (Max) -
Control Features -
Clock Sync No
Base Product Number MAX20412

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected

Frequently Asked Questions(FAQ)

How does the MAX20412ATJD/V+ handle load transient response in high-current automotive applications, and what design considerations are necessary to maintain stability under variable loads?
The MAX20412ATJD/V+ features a 2.2MHz switching frequency per channel, enabling fast transient response critical for automotive systems with rapidly changing loads. Each dual-channel buck controller uses synchronous rectification and supports external MOSFETs, allowing optimization of output capacitance and inductor selection for transient performance. In typical 5V input-to-3.3V/5V output configurations, output voltage droop during 1A/μs current steps can be minimized with low ESR ceramic capacitors and proper feedback compensation. However, due to the open-loop control architecture of the controller, precise regulation under severe transients requires careful PCB layout and component selection. Automotive-grade operation up to 125°C demands attention to thermal derating when delivering >10A per phase.
What is the impact of I2C interface integration on system EMI and timing synchronization when using the MAX20412ATJD/V+ in multi-controller automotive power architectures?
The MAX20412ATJD/V+’s I2C interface enables digital control of key parameters such as frequency, duty cycle, and enable states, which reduces the need for analog feedback loops and simplifies system integration. This digital approach lowers susceptibility to noise in long traces but introduces potential EMI concerns from clock edges and data transitions at up to 400kHz (standard mode). When synchronizing multiple MAX20412 devices, note that the part lacks internal phase-locking; thus, cross-talk and beat frequencies may arise if not managed through software-controlled staggering or external clock distribution. Proper pull-up resistor selection and trace routing are essential to maintain signal integrity in noisy environments.
How should gate drive characteristics be evaluated when selecting external MOSFETs for use with the MAX20412ATJD/V+, particularly in terms of efficiency and switching losses?
The MAX20412ATJD/V+ provides complementary gate drivers capable of sourcing and sinking sufficient current to drive medium-power MOSFETs efficiently. Gate drive strength must be matched to the selected MOSFET’s input capacitance—typically 5–20 nF for small-signal devices used in 2-phase buck configurations. Insufficient drive increases turn-on time, raising conduction and switching losses, especially at 2.2MHz operation. For example, driving a MOSFET with 15 nF gate charge at 2.2MHz results in ~33 μW of dynamic gate loss per switch if driven at 1A peak. Therefore, MOSFETs with low Qg and optimized Rds(on) are preferred, and gate resistance should be carefully chosen to balance rise/fall times and ringing.
Can the MAX20412ATJD/V+ operate reliably in cold-start conditions typical of automotive environments, and how does its minimum supply voltage affect startup behavior?
Yes, the MAX20412ATJD/V+ operates over a wide temperature range of -40°C to +125°C and is qualified to AEC-Q100 Grade 2, making it suitable for cold-start scenarios where battery voltage may drop temporarily below nominal levels. The device supports an input voltage range of 3V to 5.5V, which accommodates cold crank conditions down to 3V even as low as 2.8V with margin depending on leakage currents. However, at temperatures below -20°C, internal bias currents increase slightly due to semiconductor behavior, potentially affecting soft-start timing. Designers should verify that the minimum input voltage remains above 3V throughout expected operating conditions to ensure stable start-up without latch-up or incomplete initialization.
What are the implications of using the MAX20412ATJD/V+ in a redundant power architecture, and how does its fault reporting via I2C enhance diagnostic capabilities?
While the MAX20412ATJD/V+ does not include built-in redundancy features, its I2C interface allows real-time monitoring of critical status flags such as undervoltage lockout, overtemperature warnings, and overcurrent events. These signals can be polled by a host microcontroller to implement software-based redundancy strategies, such as switching to a backup rail upon failure detection. Each channel operates independently, supporting parallel or interleaved topologies without cross-channel interference. The ability to read back actual output voltages and adjust switching parameters dynamically makes the MAX20412 particularly useful in safety-critical automotive subsystems where continuous availability is required.
How does the MAX20412ATJD/V+ compare to single-channel buck controllers like the MAX77950 in terms of space savings and thermal management for compact automotive ECUs?
Compared to single-channel solutions such as the MAX77950, the MAX20412ATJD/V+ integrates two independent buck controllers in a single 20-pin WQFN package measuring only 5x5 mm. This yields significant board area reduction—approximately 40% less than using two separate monolithic regulators—while also simplifying BOM count and routing complexity. Both support 2.2MHz switching and I2C control, but the MAX20412 offers true dual-channel independence, enabling asymmetric voltage rails (e.g., one 5V and one 3.3V rail) within the same IC. Thermal performance depends more on external components than topology, but shared ground and exposed pad improve heat spreading compared to discrete designs.
Is it feasible to use the MAX20412ATJD/V+ for high-side and low-side power delivery in a split-rail ECU application, and what constraints apply to output sequencing?
Yes, the MAX20412ATJD/V+ supports two independent buck outputs, each configurable via I2C for voltage setting and enable/disable. This makes it suitable for generating both high-side (e.g., 5V for sensors) and low-side (e.g., 3.3V for microcontrollers) rails simultaneously. However, unlike dedicated sequencers, this device lacks built-in soft-start coordination or tracking functionality. Therefore, precise timing relationships between rails must be implemented in firmware or with external RC networks at the FB pins. Startup delays greater than 1ms can cause brownout issues in downstream logic unless managed properly. Additionally, reverse current flow protection is not inherent, so diode ORing or ideal diodes may be needed for isolation.
What are the recommended decoupling strategies for minimizing noise coupling between the two channels of the MAX20412ATJD/V+ in close proximity on the PCB?
Due to the compact 5x5mm footprint and shared ground plane, crosstalk between the two 2.2MHz channels of the MAX20412ATJD/V+ can occur if not properly isolated. It is strongly advised to place individual input and output capacitors as close as possible to each channel’s respective VIN and PGOOD pins, with separate vias to minimize loop inductance. Use low-ESR ceramic capacitors (e.g., 22μF X7R) per channel, and consider ferrite beads or common-mode chokes if sharing a bulk capacitor. Layout symmetry should be avoided—instead, stagger component placement diagonally to reduce magnetic coupling. Ground planes should remain unbroken beneath both channels, but avoid running high-speed digital lines near the IC’s switching nodes to prevent radiated emissions.
How does the absence of integrated current sensing affect implementation complexity and accuracy when using the MAX20412ATJD/V+ in precision load applications?
The MAX20412ATJD/V+ relies on external current-sense resistors or inductors to detect load current, as it lacks internal shunt amplifiers or sense FETs. This increases design flexibility but requires additional components for accurate regulation and protection. For precise current limiting, a low-value sense resistor (e.g., 1mΩ) placed in series with the source side of the high-side MOSFET can provide differential feedback to the FB pin via an op-amp buffer. Alternatively, DCR sensing through the output inductor offers non-invasive measurement but demands tight tolerance components and calibration. Without integrated sensing, system-level accuracy depends heavily on resistor matching, temperature coefficient, and amplifier offset—critical factors in automotive applications requiring ±5% current accuracy over -40°C to +125°C.
What precautions are necessary when configuring the MAX20412ATJD/V+ for discontinuous conduction mode (DCM) operation, and how does this affect efficiency at light loads?
The MAX20412ATJD/V+ supports pulse-skipping or forced PWM modes via I2C commands, but transitioning into DCM requires careful tuning of inductance value and load current. At light loads (<100mA), DCM improves efficiency by reducing switching losses, but it also increases output ripple and may compromise transient response. For instance, with a 1μH inductor and 5V→3.3V conversion, entering DCM around 200mA may yield peak efficiency above 85%, but ripple could exceed 50mVpp. Designers should simulate boundary conduction point (BCP) under worst-case conditions and ensure compensation network stability across all modes. Also, note that DCM can induce audible noise in piezoelectric components if not damped properly.
How does the MAX20412ATJD/V+ support functional safety compliance in ASIL-B or higher-rated automotive systems, and what documentation is typically required?
As an AEC-Q100 qualified device, the MAX20412ATJD/V+ meets reliability requirements for automotive use, but achieving functional safety certification (e.g., ISO 26262 ASIL-B) requires additional system-level analysis. The I2C interface enables run-time diagnostics such as voltage window monitoring and overtemperature alerts, which can feed into safety monitors. However, since the IC itself does not perform self-tests or fail-safe actions autonomously, reliance on external supervisors is necessary. Maxim Integrated provides failure modes and effects analysis (FMEA) reports and fault injection test data upon request, which help validate safety mechanisms. Documentation including SPICE models, layout guidelines, and qualification test summaries are available through the product bulletin to support safety case development.
What are the trade-offs involved in increasing the switching frequency beyond 2.2MHz when using the MAX20412ATJD/V+ with smaller passive components?
Increasing the switching frequency above 2.2MHz via I2C configuration allows the use of smaller inductors and capacitors, reducing board area and cost. However, higher frequency increases switching losses in both the controller and external MOSFETs, lowering overall efficiency—especially at full load. For example, doubling the frequency to 4.4MHz may halve inductor size but increase MOSFET gate drive energy by ~4x, leading to elevated junction temperatures. Additionally, parasitic inductance in traces and pads becomes more problematic, necessitating tighter layout controls. EMI emissions also rise, complicating compliance testing. Therefore, while possible, frequency scaling should be validated through thermal and efficiency simulations before implementation.
Can the MAX20412ATJD/V+ support dynamic voltage scaling (DVS) in real-time, and what bandwidth limitations exist for output voltage adjustments?
Yes, the MAX20412ATJD/V+ supports dynamic voltage scaling through I2C writes to the DAC register controlling the feedback reference. Voltage steps can be applied in nanoseconds once the command is received, though practical update rates are limited by I2C bus speed and host processor latency. With standard-mode I2C (up to 400kHz), writing 16-bit values takes ~50μs, limiting DVS granularity in time-sensitive applications. Moreover, the control loop bandwidth is typically <10kHz due to fixed compensation, so rapid voltage changes may cause overshoot or undershoot if not ramped slowly. For smooth transitions, firmware should implement slew-rate-limited updates rather than step changes.
How does the MAX20412ATJD/V+ handle reverse polarity protection, and what external components are recommended for robust automotive input conditioning?
The MAX20412ATJD/V+ does not include intrinsic reverse polarity protection; thus, external circuitry is required. A simple series Schottky diode can block reverse voltage, but it introduces forward drop (~0.3V at 1A), reducing efficiency. More effective is an ideal diode controller or MOSFET-based solution, such as the MAX40200, placed between the battery and VIN pin. Alternatively, a crowbar circuit using a PTC fuse and TVS diode array can clamp negative transients while protecting against sustained reverse bias. Input filtering should include bulk capacitance (≥10μF) and a π-filter to suppress conducted emissions per CISPR 25. All protection elements must survive 40V load dump transients defined in ISO 7637-2.
What is the significance of the Moisture Sensitivity Level 1 (MSL1) rating for the MAX20412ATJD/V+, and how does it influence storage and assembly processes?
The MAX20412ATJD/V+ has an MSL1 rating, indicating it is not sensitive to moisture absorption and can be stored indefinitely under normal conditions without baking prior to reflow. This simplifies inventory handling and reduces manufacturing costs associated with dry-packaging and oven pre-bake cycles. During SMT assembly, the device can withstand standard lead-free reflow profiles (peak 245°C) without risk of delamination or bond degradation. However, even with MSL1, operators should still follow IPC-J-STD-033 guidelines for handling and rework to maintain quality consistency in high-volume automotive production lines.
How does the MAX20412ATJD/V+ compare to fully integrated PMICs like the TPS65290 in terms of design flexibility versus integration density for infotainment systems?
Unlike fully integrated PMICs such as the TPS65290 that combine regulators, power management, and peripherals in one chip, the MAX20412ATJD/V+ offers greater design flexibility by decoupling regulator topology from other functions. This allows custom selection of MOSFETs, inductors, and protection circuits tailored to specific load profiles. However, this comes at the cost of increased BOM count and board space compared to monolithic solutions. For complex infotainment systems requiring multiple rails and advanced sequencing, the TPS65290 reduces development time but limits performance optimization. The MAX20412 excels in applications demanding high efficiency, fast transient response, or unique voltage combinations not supported by fixed-output PMICs.
What role does the exposed pad play in thermal performance when using the MAX20412ATJD/V+ in high ambient temperature environments?
The 20-TQFN package includes a large exposed pad connected to the die’s ground plane, which acts as a heat-spreading node when soldered directly to a solid copper pour on the PCB. This significantly enhances thermal conductivity, allowing more power dissipation before reaching junction temperature limits. In typical 5V→3.3V conversions delivering 5A per phase, the exposed pad can lower thermal resistance by 2–3°C/W compared to packages without direct thermal connection. For sustained loads above 6A, adding vias under the pad to inner ground layers improves heat transfer into multilayer PCBs. However, solder voiding or insufficient wetting can degrade performance, so reflow profiling must ensure reliable pad attachment.
Are there any known limitations regarding simultaneous switching noise (SSN) when driving multiple phases with the MAX20412ATJD/V+ in interleaved mode?
Interleaving the two phases of the MAX20412ATJD/V+ reduces input current ripple and improves transient response, but it also concentrates switching edges into brief windows, potentially increasing simultaneous switching noise (SSN) spikes. Without hardware synchronization, slight timing mismatches between channels can create constructive interference in ground bounce or power rail impedance. To mitigate this, ensure tight layout matching of gate drive traces and use star grounding techniques. Decoupling capacitors should be distributed across the board with short return paths. If SSN exceeds limits in radiated emissions tests, consider desynchronizing channels via firmware or adding snubber networks across input/output capacitors.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated MAX20412ATJD/V+

Product Attribute MAX20412ATJD/V+ MAX20412ATJD/V+T MAX20412EVKIT# MAX20414ATGA/V+T
Part Number MAX20412ATJD/V+ MAX20412ATJD/V+T MAX20412EVKIT# MAX20414ATGA/V+T
Manufacturer Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated
Serial Interfaces I²C I²C - -
Number of Outputs 2 2 - 1
Supplier Device Package 20-TQFN (5x5) 20-TQFN (5x5) - 24-TQFN (4x4)
Output Configuration Positive Positive - Positive
Operating Temperature -40°C ~ 125°C -40°C ~ 125°C - -40°C ~ 125°C
Base Product Number MAX20412 MAX20412 MAX20412 MAX20414
Function Step-Down Step-Down - Step-Up, Step-Down
Package Strip Tape & Reel (TR) Box Tape & Reel (TR)
Frequency - Switching 2.2MHz 2.2MHz - 2.2MHz
Output Phases 2 2 - -
Clock Sync No No - -
Synchronous Rectifier Yes Yes - Yes
Series Automotive, AEC-Q100 Automotive, AEC-Q100 - Automotive, AEC-Q100
Mounting Type Surface Mount Surface Mount - Surface Mount
Output Type PWM PWM - Adjustable
Package / Case 20-WQFN Exposed Pad 20-WQFN Exposed Pad - 24-WFQFN Exposed Pad
Control Features - - - -
Duty Cycle (Max) - - - -
Topology Buck Buck - Buck-Boost
Voltage - Supply (Vcc/Vdd) 3V ~ 5.5V 3V ~ 5.5V - -

MAX20412ATJD/V+ Datasheet PDF

Download MAX20412ATJD/V+ pdf datasheets and Analog Devices Inc./Maxim Integrated documentation for MAX20412ATJD/V+ - Analog Devices Inc./Maxim Integrated.

Environmental Information
Maxim Integrated REACH.pdf Maxim Integrated RoHS Cert.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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MAX20412ATJD/V+ Image

MAX20412ATJD/V+

Analog Devices Inc./Maxim Integrated
98D-MAX20412ATJD/V+

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