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Analog Devices Inc./Maxim Integrated MAX25232ATCA/V+
- Part No.:
- MAX25232ATCA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX25232ATCA/V+.pdf
- Description:
- IC REG BUCK 5V 3A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:462
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Product details
Overview
MAX25232ATCA/V+ from Maxim Integrated is a 36V, 3A synchronous buck converter with integrated high-side and low-side MOSFETs, delivering ±2% output voltage accuracy in FPWM mode across 6V–18V input range, 3.5µA quiescent current at no load, 65ns minimum on-time, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the MAX25232ATCA/V+ datasheet, MAX25232ATCA/V+ pinout, MAX25232ATCA/V+ application, or MAX25232ATCA/V+ equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade operating parameters (−40°C to +125°C, 40V load-dump tolerance), and real-world alternative selection guidance based on factory-trimmed 5V output configuration.
Technical Context
The MAX25232ATCA/V+ implements current-mode control with internal compensation, enabling stable regulation without external loop components. Its 2.1MHz fixed switching frequency supports compact 2.2µH inductors and 30µF output capacitance while avoiding AM-band interference.
It features dual-mode operation: forced-PWM (FPWM) for constant-frequency EMI control and skip mode for ultra-low IQ at light loads. The device enters dropout at 99% duty cycle and includes PGOOD monitoring, spread-spectrum enable (SPS), and thermal shutdown at 175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide automotive battery transients including cold-crank and load-dump conditions up to 40V. |
| Output Current | 3A continuous - rated for sustained industrial and automotive loads with thermal derating per θJA = 41°C/W. |
| Quiescent Current | 3.5µA at no load - enables always-on systems (e.g., infotainment standby, ADAS sensors) without battery drain. |
| Output Accuracy | ±2% in FPWM mode - ensures reliable logic-level supply for microcontrollers and sensors within 6V–18V VIN range. |
| Switching Frequency | 2.1MHz (fixed) - allows use of small 2.2µH inductors and reduces output ripple without compromising EMI performance. |
| Minimum On-Time | 65ns - enables high step-down ratios (e.g., 24V→3.3V) without pulse-skipping instability. |
| Operating Temperature | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and chassis-mounted applications. |
Pinout & Package
MAX25232ATCA/V+ is housed in a thermally enhanced 12-pin TDFN package (3mm × 3mm) with exposed pad (EP), optimized for automotive PCB layouts requiring low thermal resistance (θJC = 9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SPS | Spread-spectrum enable | Logic-high enables ±3% frequency modulation to reduce peak EMI emissions; internal 1MΩ pulldown ensures default disable. |
| 2 EN | High-voltage enable input | Accepts 3.3V–40V logic; no internal pullup/pulldown minimizes leakage; compatible with MCU GPIO or automotive KEY signals. |
| 3 BST | Bootstrap supply for high-side gate driver | Requires 0.1µF ceramic capacitor to LX; enables efficient 100% duty-cycle operation during dropout. |
| 4 SUP | Main power input | 3.5V–36V supply rail; requires 4.7µF ceramic capacitor to PGND for stable startup and transient response. |
| 5 LX | Switching node | Connects to inductor; high-impedance when disabled; clamped internally to PGND/SUP to limit voltage stress during transients. |
| 6 PGND | Power ground return | Carries high-frequency, high-current return path for LX and OUT; must be separated from AGND to avoid noise coupling. |
| 7 AGND | Analog ground reference | Reference for FB, SYNC, PGOOD, and internal error amplifier; connects to EP but must be routed separately from PGND. |
| 8 FB | Feedback input | Internally tied to BIAS for fixed 5V output (MAX25232ATCA/V+); not user-adjustable - differs from ATCF/ATCG variants. |
| 9 OUT | Regulated output | 5V output node; bypassed with ≥30µF ceramic capacitor to PGND; supplies downstream logic or analog circuitry. |
| 10 BIAS | Internal 5V bias supply | Provides 5V for internal circuitry and optional PGOOD pullup; requires 1µF ceramic capacitor to AGND. |
| 11 SYNC | Mode select / synchronization input | Ground or open = skip mode; connected to BIAS = FPWM; internal 1MΩ pulldown sets default skip mode. |
| 12 PGOOD | Open-drain power-good indicator | Active-high signal asserting VOUT >93% nominal; requires external 20kΩ pullup; debounced for 60µs in PWM mode. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated FETs | Eliminates need for external MOSFETs and drivers - reduces BOM count and layout area by >40% vs discrete solutions. |
| 3.5µA quiescent current | Enables >1-year battery life in always-on automotive modules (e.g., telematics, CAN gateway) with 10mA typical standby load. |
| 65ns minimum on-time | Supports direct 24V-to-3.3V conversion without intermediate stages - simplifies multi-rail power architecture. |
| AEC-Q100 Grade 1 qualification | Validated for automotive environments including temperature cycling, humidity, and mechanical shock - eliminates need for additional qualification testing. |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients without external TVS - reduces system-level protection component count. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers SoC, display controller, and audio codec in head-unit with cold-crank (4.5V) and load-dump (40V) immunity. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3A with PGOOD sequencing and thermal fault reporting. Use Value: Eliminates need for external LDO post-regulator due to ±2% accuracy and low noise - meets CISPR 25 Class 5 EMI limits. | Use Scenario: Supplies isolated digital I/O banks in programmable logic controller operating in factory ambient (−25°C to +70°C). IC Role / Device Role / Timing Role: Main 5V rail generator with 99% dropout capability to maintain operation during brownout events. Use Value: 3.5µA IQ extends backup battery runtime during AC loss; 2.1MHz switching avoids interference with 4–20mA analog sensing circuits. |
| ADAS Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Powers image sensor, ISP, and MIPI interface in front-facing camera exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-reliability 5V supply with AEC-Q100 Grade 1 rating and thermal shutdown at 175°C junction. Use Value: 65ns min on-time enables single-stage 12V→5V conversion - avoids efficiency loss and board space penalty of cascaded regulators. | Use Scenario: Supplies MCU, gate drivers, and position sensors in EPS ECU subject to vibration, temperature extremes, and ESD. IC Role / Device Role / Timing Role: Safety-critical 5V rail with PGOOD monitoring, undervoltage lockout (2.73V), and short-circuit auto-recovery. Use Value: 40V load-dump tolerance eliminates need for external TVS diode - reduces cost and improves MTBF in high-vibration environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5V synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 3.5V–36V input, 5A output, 12µA IQ, 2.1MHz, no spread spectrum, non-AEC-Q100 | Higher current, higher IQ, lacks automotive qualification and EMI reduction features | Select for non-automotive industrial applications where AEC-Q100 is not required and higher output current is needed. |
| TPS543B20RTWT | 4.5V–18V input, 3A output, 15µA IQ, 1.5MHz, PMBus interface, AEC-Q100 Grade 2 | Narrower VIN range, digital interface adds complexity, lower max temp (105°C) | Select when telemetry, dynamic voltage scaling, or tighter VIN constraints justify added firmware overhead and reduced thermal margin. |
Compared with LM61480RQWR and TPS543B20RTWT, MAX25232ATCA/V+ uniquely combines AEC-Q100 Grade 1 qualification, 3.5µA IQ, 40V load-dump tolerance, and spread-spectrum EMI reduction - making it optimal for cost-sensitive, safety-aware automotive 5V rails where minimal external components and proven reliability are mandatory.
Availability
MAX25232ATCA/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX25232ATCA/V+ 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, high-efficiency DC-DC converters targeting automotive subsystems requiring ultra-low IQ, wide input range, and AEC-Q100 compliance - specifically engineered for infotainment, ADAS, and body electronics power rails.
FAQ
What is the output voltage of MAX25232ATCA/V+ and is it adjustable?
The MAX25232ATCA/V+ is a factory-trimmed 5V fixed-output buck converter. Its output voltage is not user-adjustable - the FB pin is internally connected to BIAS, unlike the MAX25232ATCF/ATCG variants which support external resistor-divider programming from 3V to 10V. This fixed configuration ensures ±2% accuracy in FPWM mode and eliminates external feedback component selection errors.
Does MAX25232ATCA/V+ support forced-PWM (FPWM) mode and how is it enabled?
Yes, MAX25232ATCA/V+ supports forced-PWM mode. It is enabled by connecting the SYNC pin to the internal BIAS voltage (5V). When SYNC is grounded or left floating, the device operates in skip mode for ultra-low IQ. FPWM mode ensures constant 2.1MHz switching frequency, improving EMI predictability and reducing output voltage ripple - critical for noise-sensitive applications like camera sensors or ADC references.
What is the thermal performance of MAX25232ATCA/V+ in a standard 4-layer PCB layout?
On a standard 4-layer PCB, MAX25232ATCA/V+ exhibits a junction-to-ambient thermal resistance (θJA) of 41°C/W and junction-to-case (θJC) of 9°C/W. With its exposed pad soldered to a large copper plane and multiple thermal vias, the device sustains 3A continuous output at +85°C ambient without derating. Thermal shutdown activates at +175°C with 15°C hysteresis, ensuring robust operation in under-hood automotive environments.
How does MAX25232ATCA/V+ handle input voltage transients such as load dump?
MAX25232ATCA/V+ withstands 40V load-dump transients per ISO 7637-2 Pulse 5a without damage or latch-up. Its absolute maximum SUP rating is +40V, and internal clamping diodes on the LX node protect against overvoltage. Combined with 3.5V–36V operating range and undervoltage lockout at 2.73V, the device maintains regulation during cold-crank (down to 3.5V) and recovers cleanly after transient events - eliminating need for external TVS diodes in most automotive designs.
What external components are required for basic operation of MAX25232ATCA/V+?
For basic operation, MAX25232ATCA/V+ requires only four external components: a 4.7µF ceramic input capacitor (SUP to PGND), a 2.2µH inductor (LX to OUT), a 30µF ceramic output capacitor (OUT to PGND), and a 20kΩ pullup resistor on PGOOD. The BST capacitor (0.1µF) and BIAS bypass (1µF) are also mandatory. No external compensation network is needed due to its current-mode architecture with internal compensation.
MAX25232ATCA/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tray
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX25232ATCA/V+ FAQ
1.How can I place an order for MAX25232ATCA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25232ATCA/V+ 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 MAX25232ATCA/V+ reliable?
The price and inventory of MAX25232ATCA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25232ATCA/V+ is usually 5 days.
3.What payment methods are accepted for MAX25232ATCA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25232ATCA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25232ATCA/V+?
MAX25232ATCA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25232ATCA/V+ 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 MAX25232ATCA/V+?
For technical support, including MAX25232ATCA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25232ATCA/V+ requirements.
6.How does Aetrix verify that MAX25232ATCA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX25232ATCA/V+ 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 MAX25232ATCA/V+ meets industry standards.
7.What is the process for return or replacement of MAX25232ATCA/V+?
All MAX25232ATCA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25232ATCA/V+, 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 MAX25232ATCA/V+ part is unused and in its original packaging.
Return procedure for MAX25232ATCA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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