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Analog Devices Inc./Maxim Integrated MAX25232ATCF/V+T
- Part No.:
- MAX25232ATCF/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX25232ATCF/V+T.pdf
- Description:
- IC REG BUCK ADJ 3A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,335
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Product details
Overview
The MAX25232ATCF/V+T from Maxim Integrated is a 36V, 3A synchronous buck converter with integrated high-side and low-side MOSFETs, fixed 2.1MHz switching frequency, ±2% output voltage accuracy in FPWM mode, and 3.5µA quiescent current at no load-designed for automotive power rails requiring high input-voltage tolerance and low-power standby operation.
For engineers reviewing the MAX25232ATCF/V+T datasheet, MAX25232ATCF/V+T pinout, MAX25232ATCF/V+T application, or MAX25232ATCF/V+T equivalent, key selection considerations include its 3.5V–36V input range, adjustable 3V–10V output via external resistor divider, AEC-Q100 qualification, 40V load-dump protection, and 99% dropout duty cycle capability.
Technical Context
This device implements current-mode control with no external compensation required, enabling stable regulation across wide input/output ratios. Its 65ns minimum on-time supports high step-down ratios (e.g., 24V-to-3.3V), while the internal 2.1MHz oscillator ensures AM-band immunity and compact filter design.
Operation includes forced-PWM (FPWM) and skip modes controlled by the SYNC pin; PGOOD monitoring enables precise power sequencing; and spread-spectrum modulation (enabled via SPS pin) reduces EMI without affecting SYNC-synchronized operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports cold-crank and load-dump transients up to 40V without external protection. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in automotive ECUs. |
| Quiescent Current | 3.5µA at no load - extends battery life in always-on vehicle modules such as telematics and body controllers. |
| Switching Frequency | Fixed 2.1MHz - enables use of small 2.2µH inductors and 30µF ceramic output capacitors, minimizing solution footprint. |
| Output Voltage Range | Adjustable 3V to 10V via external resistor divider - provides flexibility for custom rail generation without redesigning the BOM. |
| Accuracy (FPWM) | ±2% over 6V–18V input - ensures reliable logic-level compliance for downstream ICs under varying battery conditions. |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 5.5V-in → 5V-out), critical for start-stop systems. |
Pinout & Package
MAX25232ATCF/V+T is housed in a thermally enhanced 12-pin TDFN package (3mm × 3mm) with exposed pad, optimized for automotive PCB layouts requiring high power density and thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SPS | Spread-spectrum enable | Logic-high enables ±3% frequency dithering to reduce peak EMI emissions; internal 1MΩ pulldown ensures default disable. |
| 2 EN | High-voltage enable input | Accepts 0–40V logic; compatible with automotive KEY/CAN inhibit signals; no internal pullup/pulldown minimizes IQ. |
| 3 BST | Bootstrap supply for HS gate driver | Requires 0.1µF capacitor to LX; enables efficient high-side FET switching above input voltage. |
| 4 SUP | Main power input | Connects to 4.7µF ceramic capacitor; supplies internal bias LDO and gate drivers; rated for 40V transient. |
| 5 LX | Switch node | Connects to inductor; high-frequency switching node; internal clamp diodes protect against inductive kickback. |
| 6 PGND | Power ground return | Carries high-current ripple; must be routed separately from AGND to avoid noise coupling into analog circuitry. |
| 7 AGND | Analog ground reference | Reference for FB, PGOOD, and error amplifier; requires low-impedance connection to exposed pad for stability. |
| 8 FB | Feedback input | Used only with MAX25232ATCF/V+T for adjustable output; senses 1.0V reference; 0.02µA input bias enables high-resistor-divider designs. |
| 9 OUT | Regulated output | Connects to output capacitor bank; also serves as sense point for PGOOD and internal loop compensation. |
| 10 BIAS | Internal 5V bias supply | Provides regulated 5V for internal circuitry; requires ≥1µF ceramic bypass to AGND; powers SYNC/SPS logic. |
| 11 SYNC | Mode control input | Ground or open = skip mode; tied to BIAS = forced-PWM; internal 1MΩ pulldown ensures defined startup state. |
| 12 PGOOD | Open-drain power-good indicator | Active-high signal asserting when VOUT > 93% nominal; requires external 20kΩ pullup; debounced for 80µs in PWM mode. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated FETs | Eliminates need for external MOSFETs and gate drivers-reducing BOM count and layout complexity in space-constrained automotive modules. |
| AEC-Q100 qualified | Rated for −40°C to +125°C junction temperature and validated for automotive reliability-enabling drop-in use in engine control, ADAS, and infotainment systems. |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients without external TVS-reducing system-level protection component count and cost. |
| Fixed 3.5ms soft-start | Prevents inrush current damage to input capacitors and downstream loads; includes automatic retry on short-circuit fault detection. |
| Thermal shutdown with hysteresis | Shuts down at 175°C (typ) and restarts after 15°C cooldown-prevents thermal runaway during sustained overload or poor heatsinking. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface circuits in a vehicle's central body controller operating from 9V–16V battery with cold-crank dips to 3.5V. IC Role / Device Role / Timing Role: Primary 5V or 3.3V DC-DC regulator delivering stable, low-noise power with precise sequencing via PGOOD and EN control. Use Value: 3.5µA quiescent current extends sleep-mode battery life; 99% duty cycle sustains regulation during cranking; AEC-Q100 ensures long-term field reliability. | Use Scenario: Generating isolated 5V rail for digital I/O modules in factory automation equipment exposed to 24V industrial bus with voltage surges. IC Role / Device Role / Timing Role: High-input-voltage buck converter providing tightly regulated output with fast transient response to handle solenoid switching loads. Use Value: 36V max input and 40V transient tolerance eliminate need for upstream clamping; 2.1MHz switching enables compact magnetics and low-profile layout. |
| Automotive Telematics Unit (TCU) | High-Voltage DC-DC Converter for EV Auxiliary Systems |
Use Scenario: Powering LTE modem, GNSS receiver, and MCU in always-on vehicle connectivity units requiring ultra-low standby IQ and robust EMI performance. IC Role / Device Role / Timing Role: Main system regulator with spread-spectrum enabled (SPS pin) to meet CISPR 25 Class 5 radiated emissions limits in dense RF environments. Use Value: ±3% spread spectrum reduces peak EMI by >10dB; 3.5µA IQ meets OEM requirements for <10µA total module sleep current. | Use Scenario: Stepping down 48V or 60V auxiliary battery voltage to 5V/3.3V for gateway ECUs and display controllers in electric vehicles. IC Role / Device Role / Timing Role: High-ratio buck stage supporting wide VIN range and large input-to-output differentials with minimal external components. Use Value: 65ns minimum on-time enables direct 48V-to-5V conversion; 3A output supports multi-rail distribution; TDFN package simplifies thermal management on high-density boards. |
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, but 15µA IQ and no AEC-Q100 rating | Targeted at industrial/high-current applications; lacks automotive qualification and ultra-low-IQ optimization | Choose LM61480RQWR only if higher output current is required and automotive qualification is not mandatory. |
| TPS543B20RJER | 4.5V–18V input, 3A output, 2.2MHz, 10µA IQ, AEC-Q100 Grade 1 (−40°C to +125°C) | Lower VIN range excludes 24V/36V automotive systems; no 40V load-dump protection | Select TPS543B20RJER for cost-sensitive non-load-dump automotive sub-systems where 18V max input suffices. |
Compared with LM61480RQWR and TPS543B20RJER, the MAX25232ATCF/V+T uniquely combines 3.5V–36V operation, 40V transient tolerance, AEC-Q100 Grade 0 (−40°C to +125°C), and 3.5µA IQ-making it the only option qualified for demanding automotive front-end power stages requiring both ultra-low standby power and high-voltage resilience.
Availability
MAX25232ATCF/V+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and high-voltage DC-DC converter designs requiring stable component supply, long lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX25232ATCF/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, high-efficiency buck converters optimized for automotive power systems requiring AEC-Q100 qualification, ultra-low quiescent current, and robust transient handling-targeting ECU, ADAS, and telematics applications.
FAQ
What is the maximum input voltage the MAX25232ATCF/V+T can withstand during load-dump events?
The MAX25232ATCF/V+T is rated for 40V absolute maximum input voltage and explicitly designed to survive ISO 7637-2 Pulse 5a load-dump transients without external protection components. This capability is verified per AEC-Q100 stress testing and enables simplified front-end design in 12V and 24V automotive systems.
Can the MAX25232ATCF/V+T be used to generate a 3.3V output, and what is the accuracy in FPWM mode?
Yes, the MAX25232ATCF/V+T supports adjustable output from 3V to 10V using an external resistor divider on the FB pin. When configured for 3.3V output, its accuracy is ±2% in forced-PWM (FPWM) mode within the 6V–18V input range-matching the specification for factory-trimmed 3.3V variants like MAX25232ATCB.
Does the MAX25232ATCF/V+T require external compensation components?
No, the MAX25232ATCF/V+T uses an internal current-mode control architecture that eliminates the need for external compensation networks. Stability is guaranteed across all operating conditions with only the recommended input/output capacitors and inductor-reducing design time and bill-of-materials count.
How does the MAX25232ATCF/V+T achieve ultra-low 3.5µA quiescent current?
The MAX25232ATCF/V+T achieves 3.5µA quiescent current by entering a deep standby mode when load current drops below ~5mA: most internal circuitry-including the high-voltage LDO-is disabled, leaving only essential regulation functions active. This mode is enabled automatically in skip mode with no external intervention required.
Is the MAX25232ATCF/V+T pin-compatible with other variants in the MAX25232 family?
Yes, all MAX25232 variants-including MAX25232ATCF/V+T, MAX25232ATCG, and MAX25232ATCD-share identical 12-pin TDFN package footprints and pinouts. Differences are limited to internal trimming (output voltage, current limit, switching frequency), allowing hardware reuse across multiple output configurations.
MAX25232ATCF/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 10V
- 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)
MAX25232ATCF/V+T FAQ
1.How can I place an order for MAX25232ATCF/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25232ATCF/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 MAX25232ATCF/V+T reliable?
The price and inventory of MAX25232ATCF/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 MAX25232ATCF/V+T is usually 5 days.
3.What payment methods are accepted for MAX25232ATCF/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25232ATCF/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25232ATCF/V+T?
MAX25232ATCF/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25232ATCF/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 MAX25232ATCF/V+T?
For technical support, including MAX25232ATCF/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25232ATCF/V+T requirements.
6.How does Aetrix verify that MAX25232ATCF/V+T is sourced from the original manufacturer or authorized distributors?
All MAX25232ATCF/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 MAX25232ATCF/V+T meets industry standards.
7.What is the process for return or replacement of MAX25232ATCF/V+T?
All MAX25232ATCF/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25232ATCF/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 MAX25232ATCF/V+T part is unused and in its original packaging.
Return procedure for MAX25232ATCF/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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