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Analog Devices Inc./Maxim Integrated MAX25232ATCH/V+
- Part No.:
- MAX25232ATCH/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX25232ATCH/V+.pdf
- Description:
- IC REG BUCK 3.3V 3A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,384
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Product details
Overview
The MAX25232ATCH/V+ from Maxim Integrated is a synchronous buck DC-DC converter with integrated high-side and low-side MOSFETs, delivering up to 2.5A output current across a 3.5V–36V input range while consuming only 6µA typical quiescent current in no-load skip mode. It features fixed 4.0V output voltage with ±2% accuracy in forced-PWM mode, 65ns minimum on-time, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the MAX25232ATCH/V+ datasheet, MAX25232ATCH/V+ pinout, MAX25232ATCH/V+ application, or MAX25232ATCH/V+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, automotive-grade protection features, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The MAX25232ATCH/V+ implements a current-mode control architecture with internal compensation, enabling stable regulation without external loop components. Its 2.1MHz (typ) switching frequency supports compact 2.2µH inductors and 30µF ceramic output capacitance, while 65ns minimum on-time enables high step-down ratios - e.g., 24V-to-4V conversion at ~17% duty cycle.
It integrates dual MOSFETs with matched 70mΩ high-side and low-side RDS(on), operates down to 99% duty cycle in dropout, and includes dedicated PGOOD monitoring, spread-spectrum modulation (±3%), and thermal shutdown at 175°C with 15°C hysteresis - all within an automotive-grade -40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.5A continuous - sufficient for powering automotive infotainment SoCs, ADAS camera modules, or industrial PLC I/O rails. |
| Input Voltage Range | 3.5V to 36V - accommodates cold-crank (4.5V), start-stop (6V), and load-dump (40V transient) conditions in 12V/24V vehicle systems. |
| Fixed Output Voltage | 4.0V ±2% in FPWM mode - matches common microcontroller core or sensor bias rail requirements with minimal external components. |
| Quiescent Current | 6µA typical at no load - extends battery life in always-on automotive modules such as telematics or remote keyless entry receivers. |
| Switching Frequency | 2.1MHz (typ) - avoids AM radio band (0.53–1.71MHz), enables small magnetics and low-profile 1206/0805 passives. |
| Minimum On-Time | 65ns - supports 24V-to-4V conversion at 2.1MHz without pulse-skipping, maintaining tight regulation under wide VIN/VOUT ratios. |
| Protection Features | 40V load-dump tolerance, overcurrent limit (3.5A typ), thermal shutdown (175°C), and undervoltage lockout (2.73V typ) - meets ISO 7637-2 and AEC-Q100 stress requirements. |
Pinout & Package
The MAX25232ATCH/V+ is housed in a thermally enhanced 3mm × 3mm, 12-pin TDFN package with exposed pad (package code TD1233+2C), optimized for automotive PCB layouts requiring high power density and efficient heat dissipation via soldered thermal pad to internal ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SPS | Spread-spectrum enable | Pull high to reduce EMI peak emissions by ±3% frequency dither; internal 1MΩ pulldown ensures default disable. |
| 2 EN | High-voltage enable input | Logic-compatible from 0.6V to 40V - accepts direct connection to MCU GPIO or automotive KEY signal without level-shifting. |
| 3 BST | Bootstrap supply for high-side gate driver | Requires 0.1µF ceramic capacitor to LX; enables full enhancement of integrated high-side MOSFET during PWM cycles. |
| 4 SUP | Main power input | Accepts 3.5V–36V; requires 4.7µF low-ESR ceramic capacitor to PGND for stable operation and transient immunity. |
| 5 LX | Switching node | Connects to inductor; carries high di/dt current - must be routed with short, wide trace to minimize EMI and voltage spikes. |
| 6 PGND | Power ground return | Carries high-frequency inductor current and switch-node return - must be separated from AGND and tied to exposed pad. |
| 7 AGND | Analog reference ground | Reference for FB, SYNC, PGOOD; connects to quiet ground plane and bypass capacitor (1µF to AGND). |
| 8 FB | Feedback input | Internally connected to BIAS for fixed-output variants - no external resistor divider needed for MAX25232ATCH/V+. |
| 9 OUT | Regulated output | Delivers 4.0V; bypassed with ≥30µF ceramic capacitor to PGND for stability and ripple suppression. |
| 10 BIAS | Internal 5V bias supply | Provides gate drive and internal logic bias; requires 1µF ceramic capacitor to AGND - powers internal circuitry after soft-start. |
| 11 SYNC | Mode selection clock input | Ground or open = skip mode; connect to BIAS = forced-PWM - enables dynamic efficiency vs. EMI trade-off during runtime. |
| 12 PGOOD | Open-drain power-good indicator | Active-high signal pulled low when VOUT drops below 92% of nominal - used for system power sequencing and fault detection. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated FETs | Eliminates need for external MOSFETs and drivers - reduces BOM count, layout area, and gate-drive loop inductance. |
| 3.5ms internal soft-start | Prevents inrush current and output overshoot during power-up - eliminates need for external soft-start timing components. |
| PGOOD and high-voltage EN | Enables robust power sequencing in multi-rail automotive systems - EN tolerates battery transients; PGOOD interfaces directly with MCU reset inputs. |
| AEC-Q100 qualified (-40°C to +125°C) | Validated for automotive under-hood and cabin applications - meets stress test requirements for temperature, humidity, and vibration. |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a (40V/100ms) without external TVS - reduces system-level protection component count. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers display controller, audio codec, and touch processor in head-unit systems with cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary 4.0V buck regulator supplying core logic voltage with PGOOD-monitored startup sequencing. Use Value: 6µA quiescent current extends battery life during vehicle sleep mode; 99% dropout operation maintains function during engine cranking. | Use Scenario: Supplies image sensor and ISP in forward-facing camera modules exposed to under-hood temperature extremes. IC Role / Device Role / Timing Role: Fixed-output 4.0V regulator with thermal shutdown and load-dump immunity for safety-critical vision subsystems. Use Value: AEC-Q100 qualification and -40°C to +125°C operation ensure reliability in harsh thermal environments; 2.1MHz switching minimizes EMI near sensitive analog video paths. |
| Industrial Control I/O Rail | Telematics Cellular Modem Supply |
Use Scenario: Generates 4.0V rail for PLC digital I/O isolators and CAN transceivers operating from 24V industrial bus. IC Role / Device Role / Timing Role: High-input-voltage buck converter with 36V max rating and 40V transient tolerance for factory automation equipment. Use Value: 3.5V–36V input range covers brownout and surge conditions; PGOOD enables coordinated reset of fieldbus peripherals. | Use Scenario: Powers LTE/NB-IoT modem in vehicle tracking units requiring ultra-low standby current and fast wake-up. IC Role / Device Role / Timing Role: Always-on 4.0V supply with 6µA no-load IQ and 3.5ms soft-start for rapid network reconnection after deep sleep. Use Value: Skip-mode efficiency preserves battery charge over months of idle time; spread-spectrum reduces cellular band interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRTWRQ1 | 4.5V–36V input, 3A output, 2.1MHz, fixed 3.3V/5V options only - no 4.0V variant; higher 12µA IQ in skip mode. | Requires external feedback resistors to achieve 4.0V; lacks integrated spread-spectrum modulation. | Select when 3A output is required and 4.0V can be set externally; verify EMI compliance without built-in dither. |
| TPS543B20RTWT | 4.5V–18V input, 3A output, adjustable VOUT (0.6V–5.5V), 2.2MHz, 15µA IQ - narrower VIN range, no load-dump rating. | Not AEC-Q100 qualified; unsuitable for 24V automotive systems with >18V transients. | Use only in non-automotive industrial or consumer applications where input stays below 18V and AEC-Q100 is not mandated. |
Compared with LM61480QRTWRQ1 and TPS543B20RTWT, the MAX25232ATCH/V+ uniquely combines factory-trimmed 4.0V output, 40V load-dump tolerance, AEC-Q100 qualification, and integrated spread-spectrum - making it the only drop-in solution for automotive 4V rail generation without external feedback or protection components.
Availability
The MAX25232ATCH/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial control I/O rails requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX25232ATCH/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, AEC-Q100-qualified buck converters targeting automotive power rails where ultra-low IQ, high input voltage, and EMI robustness are critical - especially for always-on modules and vision systems.
FAQ
What is the output voltage of the MAX25232ATCH/V+ and how is it set?
The MAX25232ATCH/V+ provides a factory-trimmed fixed 4.0V output voltage with ±2% accuracy in forced-PWM mode. Unlike adjustable variants (e.g., MAX25232ATCF), it requires no external resistor divider - the FB pin is internally connected to BIAS. This simplifies layout and improves long-term stability by eliminating external component drift and tolerance effects. The MAX25232ATCH/V+ achieves this using laser-trimmed internal feedback resistors during wafer sort.
Does the MAX25232ATCH/V+ support forced-PWM (FPWM) mode and how is it enabled?
Yes, the MAX25232ATCH/V+ supports forced-PWM mode to eliminate audible noise and ensure constant switching frequency for predictable EMI filtering. FPWM is enabled by connecting the SYNC pin to the BIAS pin (5V internal supply). When SYNC is grounded or left floating, the device defaults to skip mode for highest light-load efficiency. The MAX25232ATCH/V+ allows runtime switching between modes - enabling dynamic optimization of efficiency versus EMI performance.
What protection features does the MAX25232ATCH/V+ include for automotive use?
The MAX25232ATCH/V+ includes 40V load-dump tolerance per ISO 7637-2, overcurrent limiting at 3.5A (typ), thermal shutdown at 175°C with 15°C hysteresis, undervoltage lockout at 2.73V (typ), and 99% dropout operation. These features are validated per AEC-Q100 Grade 1 requirements and allow direct integration into automotive power trees without additional TVS diodes or external current-sense circuitry - reducing system cost and board space.
What is the quiescent current of the MAX25232ATCH/V+ and under what conditions is it measured?
The MAX25232ATCH/V+ draws 6µA typical quiescent current at no load in skip mode, as specified in the Electrical Characteristics table for MAX25232ATCA/ATCD/ATCH variants. This value is measured with VSUP = 14V, VOUT = 4V, TJ = +25°C, and SYNC unconnected. The low IQ is achieved by disabling the internal high-voltage LDO and powering bias circuitry from the output after soft-start completion - a key enabler for automotive always-on applications like telematics and remote keyless entry.
Is the MAX25232ATCH/V+ pin-compatible with other MAX25232 variants?
Yes, all MAX25232 variants - including MAX25232ATCH/V+, MAX25232ATCF, and MAX25232ATCD - share identical 12-pin TDFN package (TD1233+2C), pinout, and footprint. However, output voltage, current rating, and switching frequency differ by part number: MAX25232ATCH/V+ is fixed 4.0V/2.5A/2.1MHz, while MAX25232ATCD is fixed 5.0V/3A/400kHz. PCB layout and thermal design are fully reusable across the family, enabling scalable power design.
MAX25232ATCH/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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX25232ATCH/V+ FAQ
1.How can I place an order for MAX25232ATCH/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25232ATCH/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 MAX25232ATCH/V+ reliable?
The price and inventory of MAX25232ATCH/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25232ATCH/V+ is usually 5 days.
3.What payment methods are accepted for MAX25232ATCH/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25232ATCH/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25232ATCH/V+?
MAX25232ATCH/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25232ATCH/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 MAX25232ATCH/V+?
For technical support, including MAX25232ATCH/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25232ATCH/V+ requirements.
6.How does Aetrix verify that MAX25232ATCH/V+ is sourced from the original manufacturer or authorized distributors?
All MAX25232ATCH/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 MAX25232ATCH/V+ meets industry standards.
7.What is the process for return or replacement of MAX25232ATCH/V+?
All MAX25232ATCH/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25232ATCH/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 MAX25232ATCH/V+ part is unused and in its original packaging.
Return procedure for MAX25232ATCH/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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