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Analog Devices Inc./Maxim Integrated MAX25232ATCE/V+T
- Part No.:
- MAX25232ATCE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX25232ATCE/V+T.pdf
- Description:
- IC REG BUCK 3.3V 3A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
The MAX25232ATCE/V+T from Maxim Integrated is a 36V, 3A synchronous buck converter with integrated high-side and low-side MOSFETs, 400kHz fixed switching frequency, ±2% output voltage accuracy in FPWM mode, 3.5µA quiescent current at no load, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the MAX25232ATCE/V+T datasheet, MAX25232ATCE/V+T pinout, MAX25232ATCE/V+T application, or MAX25232ATCE/V+T equivalent, key selection considerations include its 3.5V–36V input range, 99% dropout capability, PGOOD monitoring, spread-spectrum EMI reduction, and thermal shutdown at 175°C - all in a 3mm × 3mm TDFN-EP package.
Technical Context
This device uses current-mode control with internal compensation, enabling stable regulation without external loop components. Its 65ns minimum on-time supports high step-down ratios (e.g., 24V-to-3.3V), while the 400kHz switching frequency minimizes conduction losses and maximizes efficiency at medium-to-heavy loads.
Operation includes dual modes: forced-PWM (FPWM) when SYNC is tied to BIAS for constant-frequency EMI control, and skip mode under light loads to maintain ultra-low 3.5µA IQ. The integrated 5V bias LDO powers internal circuitry, and the PGOOD signal provides accurate output-voltage monitoring with 92–95% threshold hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide automotive battery transients including 40V load-dump tolerance. |
| Output Current | 3A continuous - rated for sustained operation up to +125°C junction temperature per AEC-Q100. |
| Switching Frequency | 400kHz (typ) - optimized for peak efficiency and reduced switching losses vs. 2.1MHz variants. |
| Quiescent Current | 3.5µA at no load - enables always-on systems like infotainment standby or ADAS sensors without battery drain. |
| Output Accuracy | ±2% in FPWM mode (6V–18V VIN) - ensures reliable logic supply compliance for microcontrollers and sensors. |
| Duty Cycle Max | 99% - maintains regulation during cold-crank (e.g., 5V out from 5.5V input), critical for automotive start-stop. |
| Thermal Shutdown | 175°C with 15°C hysteresis - protects against sustained overload or poor heatsinking in enclosed modules. |
| PGOOD Threshold | Rising: 93% VOUT (typ); falling: 92% VOUT (typ) - provides clean, debounced power-good assertion for system sequencing. |
Pinout & Package
MAX25232ATCE/V+T is housed in a 12-pin 3mm × 3mm TDFN-EP package with exposed thermal pad (package code TD1233+2C). The exposed pad must be soldered to a PCB ground plane for thermal management (θJA = 41°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SPS | Spread-spectrum enable | Logic-high enables ±3% frequency modulation to reduce EMI peaks; internal 1MΩ pulldown ensures default disable. |
| 2 EN | High-voltage enable input | Active-high, 2.4V threshold; compatible with 3.3V logic or direct battery connection; zero leakage preserves IQ. |
| 3 BST | Bootstrap supply for HS gate driver | Requires 0.1µF ceramic capacitor to LX; enables efficient high-side FET drive in synchronous topology. |
| 4 SUP | Main power input | Accepts 3.5V–36V; requires 4.7µF ceramic bypass to PGND near pin for stable startup and transient response. |
| 5 LX | Switch node | Connects to inductor; high dv/dt node - must be routed short and away from sensitive analog traces. |
| 6 PGND | Power ground return | Carries high-frequency, high-current return path for LX and OUT; separate from AGND to avoid noise coupling. |
| 7 AGND | Analog ground reference | Reference for FB, SYNC, SPS, PGOOD; connects to exposed pad only via low-impedance thermal path, not current path. |
| 8 FB | Feedback input | Internally connected to BIAS for fixed-output variants; used with external resistor divider only on ATCF/ATCG. |
| 9 OUT | Regulated output | Delivers up to 3A; bypassed with ≥30µF ceramic capacitance (derated) for stability and ripple suppression. |
| 10 BIAS | Internal 5V bias supply | Provides regulated 5V for internal circuitry; requires ≥1µF ceramic cap to AGND; powers PGOOD pullup if used. |
| 11 SYNC | Mode control / synchronization input | Tied to BIAS → FPWM; grounded/open → skip mode; internal 1MΩ pulldown enables default light-load optimization. |
| 12 PGOOD | Open-drain power-good indicator | Active-high signal asserted when VOUT >93% nominal; requires external 20kΩ pullup to BIAS or system rail. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated 70mΩ/70mΩ FETs | Eliminates external MOSFETs and drivers, reducing BOM count and board area by >40% vs. controller-based solutions. |
| 400kHz fixed-frequency operation | Optimizes conduction losses and efficiency at 1–3A loads, especially in 12V/24V automotive systems. |
| 3.5µA quiescent current in standby | Enables >1-year battery life in always-on vehicle modules (e.g., telematics, CAN wake-up receivers) without auxiliary LDOs. |
| 99% duty-cycle dropout operation | Maintains regulated 3.3V/5V output during cold-crank events down to 5.5V input - critical for ASIL-B subsystems. |
| AEC-Q100 Grade-1 qualification (−40°C to +125°C) | Validated for under-hood and transmission-control applications with full parametric performance across temperature. |
| Integrated PGOOD with 60–110µs debounce | Provides glitch-free power sequencing for MCUs, FPGAs, and PMICs without external supervisors or RC filters. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface circuitry in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary 5V/3.3V DC-DC regulator delivering clean, sequenced power with PGOOD confirmation. Use Value: Withstands 40V load-dump transients and cold-crank dips while maintaining <±2% output accuracy and <3.5µA sleep current. | Use Scenario: Generating isolated 5V rail for digital I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Compact, high-reliability buck converter supplying FPGA configuration and level-shifting logic. Use Value: 36V max input accommodates 24V industrial bus variations; 400kHz switching reduces heat rise in confined DIN-rail enclosures. |
| Automotive ADAS Camera Power | High-Voltage DC-DC Converter Stage |
Use Scenario: Providing stable 3.3V to image sensor and serializer ICs in surround-view or front-facing cameras. IC Role / Device Role / Timing Role: Point-of-load regulator with fast transient response and low-noise output for analog pixel circuits. Use Value: 65ns min on-time enables 12V-to-3.3V conversion in single stage; PGOOD ensures camera boot only after rail stabilization. | Use Scenario: Intermediate 5V rail generation in multi-stage converters for 48V mild-hybrid or server PSUs. IC Role / Device Role / Timing Role: High-input-voltage buck stage stepping down from 48V/60V bus to 5V/12V intermediate bus. Use Value: 36V absolute max rating with 40V transient tolerance allows safe operation with margin above 48V nominal systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 4.5V–36V input, 8A output, 2.1MHz default, no AEC-Q100 rating | Targeted at industrial/commercial high-current designs; lacks automotive qualification and 400kHz option | Select when higher output current (>3A) and smaller solution size are prioritized over automotive compliance. |
| MPQ4420AGL-A | 3.3V–36V input, 2A output, 400kHz/2.2MHz selectable, AEC-Q100 Grade-1 | Lower current rating limits use to sub-2A loads; identical thermal and EMI features but reduced headroom | Choose for cost-sensitive automotive modules where 2A suffices and footprint compatibility with 3×3mm QFN is required. |
Compared with LM61480RQWR and MPQ4420AGL-A, the MAX25232ATCE/V+T uniquely balances 3A capability, AEC-Q100 Grade-1 qualification, 400kHz efficiency optimization, and 3.5µA IQ - making it the preferred choice for thermally constrained, battery-sensitive automotive ECUs requiring guaranteed automotive reliability.
Availability
MAX25232ATCE/V+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, ADAS camera modules, and high-voltage DC-DC converter stages requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for MAX25232ATCE/V+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.
The MAX25232 product line delivers compact, AEC-Q100-qualified buck converters targeting automotive power rails where ultra-low IQ, high input voltage, and robust thermal/EMI performance are mandatory.
FAQ
What is the maximum input voltage the MAX25232ATCE/V+T can withstand during load-dump events?
The MAX25232ATCE/V+T supports 40V absolute maximum input voltage on the SUP pin, enabling reliable operation during ISO 7637-2 Load Dump Pulse 5a (35V/40V peak) without external TVS clamping. This rating is validated across temperature and applies to transient conditions lasting ≤1 second, making it suitable for 12V and 24V automotive systems.
Does the MAX25232ATCE/V+T require external compensation components?
No, the MAX25232ATCE/V+T uses an internally compensated current-mode control architecture that eliminates the need for external compensation networks. All stability and transient response characteristics are factory-optimized, allowing direct implementation with only input/output capacitors and an inductor - significantly reducing design cycle time and BOM cost.
What output voltage options are available for the MAX25232ATCE/V+T?
The MAX25232ATCE/V+T is a fixed 3.3V output variant with ±2% accuracy in FPWM mode. It does not support adjustable output via FB pin - that functionality is exclusive to MAX25232ATCF and MAX25232ATCG. Other factory-trimmed fixed outputs (e.g., 5V, 4V) exist within the MAX25232 family but require different part numbers.
How does the MAX25232ATCE/V+T achieve ultra-low quiescent current?
The MAX25232ATCE/V+T achieves 3.5µA quiescent current by entering standby mode when load current drops below ~5mA: internal high-voltage LDO shuts off, non-essential circuitry is powered down, and only core regulation blocks remain active. This state is automatically entered and exited based on real-time load monitoring - no external control required.
Is the MAX25232ATCE/V+T pin-compatible with other MAX25232 variants?
Yes, all MAX25232 variants - including MAX25232ATCE/V+T - share identical 12-pin TDFN-EP (3mm × 3mm) packaging and pinout. This allows drop-in replacement between fixed-output versions (e.g., ATCA, ATCB, ATCE) and simplifies design reuse across voltage requirements, provided external components (inductor, output caps) match the target VOUT and fSW.
MAX25232ATCE/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX25232ATCE/V+T FAQ
1.How can I place an order for MAX25232ATCE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25232ATCE/V+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 MAX25232ATCE/V+T reliable?
The price and inventory of MAX25232ATCE/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25232ATCE/V+T is usually 5 days.
3.What payment methods are accepted for MAX25232ATCE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25232ATCE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25232ATCE/V+T?
MAX25232ATCE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25232ATCE/V+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 MAX25232ATCE/V+T?
For technical support, including MAX25232ATCE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25232ATCE/V+T requirements.
6.How does Aetrix verify that MAX25232ATCE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX25232ATCE/V+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 MAX25232ATCE/V+T meets industry standards.
7.What is the process for return or replacement of MAX25232ATCE/V+T?
All MAX25232ATCE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25232ATCE/V+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 MAX25232ATCE/V+T part is unused and in its original packaging.
Return procedure for MAX25232ATCE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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