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Analog Devices Inc./Maxim Integrated MAX20472BATCC/V+T
- Part No.:
- MAX20472BATCC/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX20472BATCC/V+T.pdf
- Description:
- IC REG BST 3.85V 500MA/1A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,553
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Product details
Overview
MAX20472BATCC/V+T from Analog Devices is a high-efficiency, automotive-grade synchronous boost converter IC that steps up 3.0V–4.0V input to a factory-preset 3.85V output at up to 500mA, with ±1.5% output voltage accuracy, 2.0MHz fixed-frequency PWM operation, and integrated overtemperature/overcurrent protection. It serves as a compact, low-noise power supply for automotive CAN transceivers and point-of-load applications requiring stable 3.85V rail generation in space-constrained modules.
For engineers reviewing the MAX20472BATCC/V+T datasheet, MAX20472BATCC/V+T pinout, MAX20472BATCC/V+T application, or MAX20472BATCC/V+T equivalent, key selection criteria include its 3.85V factory-configured output, 2.0MHz switching frequency (vs. 2.2MHz in non-B variants), 12-pin 3mm×3mm TDFN-EP package with exposed pad, True Shutdown™ capability, and open-drain RESET output with selectable hold time.
Technical Context
The MAX20472BATCC/V+T implements current-mode control with forced-PWM (FPWM) and skip-mode operation selected via the SYNC pin: FPWM is enforced when SYNC is tied to VAV or driven externally, while unconnected/GND SYNC enables load-dependent skip mode - unlike MAX20472 (non-B), which auto-switches to FPWM above skip threshold. Its internal 2.0MHz oscillator supports spread-spectrum modulation (±3%) to reduce EMI, and charge-mode startup delivers up to 1.7A peak current to precharge the output before soft-start.
Protection architecture includes cycle-by-cycle current limiting (4.2A nMOS threshold), thermal shutdown at 165°C with 15°C hysteresis, and UV/OV monitoring on the RESET pin (93±2% UV, 107±2% OV). The device integrates low-RDS(ON) pMOS (150mΩ) and nMOS (100mΩ) switches, enabling >93% efficiency at full load with all-ceramic external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 3.85V ±1.5% - eliminates external feedback resistors and ensures precise rail for CAN transceiver biasing. |
| Switching Frequency | 2.0MHz fixed (MAX20472B variant) - enables use of small 1µH inductor and 22µF ceramic output capacitor; reduces EMI vs. lower frequencies. |
| Output Current | 500mA continuous - sufficient for dual CAN FD transceivers or multiple low-power sensors in automotive domain controllers. |
| Input Voltage Range | 3.0V to 4.0V - matches automotive battery-supplied 3.3V domains and tolerates cold-crank dips down to 3.0V. |
| Operating Temperature | -40°C to +125°C - qualified per AEC-Q100 Grade 1, supporting under-hood and body-control module deployment. |
| Shutdown Current | 0.1µA typical - enables ultra-low quiescent power in always-on vehicle networks without compromising wake-up latency. |
| RESET Output | Open-drain, active-low with 0.5ms/3.7ms/7.4ms/14.8ms hold options - provides configurable power-good signaling for microcontroller reset sequencing. |
Pinout & Package
MAX20472BATCC/V+T is housed in a 12-pin, 3mm × 3mm TDFN-EP package (package code TD1233+2C) with exposed thermal pad connected to PGND. The pinout is identical across MAX20471/MAX20472/MAX20472B variants and optimized for minimal PCB area and thermal resistance (θJA = 41°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SSEN | Spread-Spectrum Enable | Logic-high enables ±3% pseudorandom frequency dithering to suppress narrowband radiated emissions. |
| 2 OUTS | Output Voltage Feedback | Connected directly to output capacitor; sets regulation point via internal resistor divider (no external components needed). |
| 3 OUT | Regulated Output | Delivers 3.85V at up to 500mA; requires 22µF ceramic capacitor for stability and low ripple. |
| 4,5 LX | Switch Node | High-current connection to inductor; carries pulsed current up to 4.2A peak; layout must minimize loop area. |
| 6 PGND | Power Ground | Low-impedance return path for LX and output rectifier; separate from analog ground to reduce noise coupling. |
| 7 RESET | Open-Drain Reset Output | Asserts low during UV/OV fault or startup; requires external pull-up to system I/O voltage (e.g., 3.3V or 5V). |
| 8 GND | Analog Ground | Reference for internal comparators and reference circuits; tied to EP and PGND at single-point star ground. |
| 9 AV | Analog Power Supply | Bias supply for internal circuitry; requires local 1µF ceramic decoupling to PGND. |
| 10 EN | Active-High Enable | Drives high (>1.5V) to enable conversion; 100mV hysteresis prevents chatter near threshold. |
| 11 SYNC | Mode Control Input | GND/unconnected → skip mode; VAV/external clock → forced 2.0MHz PWM - critical for EMI-sensitive CAN systems. |
| 12 EP | Exposed Thermal Pad | Must be soldered to solid PGND plane; primary thermal path (θJC = 8.5°C/W) and electrical ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Output discharges to 0V via 300Ω internal resistor when EN is low - eliminates need for external discharge FET in battery-backed systems. |
| Programmable RESET Hold Time | Selectable 0.5ms / 3.7ms / 7.4ms / 14.8ms timeout ensures reliable MCU reset assertion after power stabilization. |
| Integrated Low-RDS(ON) Switches | pMOS = 150mΩ, nMOS = 100mΩ - reduces conduction loss by >30% vs. discrete MOSFET solutions, improving full-load efficiency to >93%. |
| Charge-Mode Startup | 1.7A current-limited precharge phase brings output within 600mV of input before soft-start - prevents brownout during cold-start conditions. |
| Automotive-Grade Protection | Combined OTP (165°C), OCP (4.2A), UVLO (2.55V), and hiccup-mode recovery - meets ASIL-B functional safety requirements for power rails. |
Applications
| Automotive CAN Transceivers | Body Control Modules (BCM) |
|---|---|
Use Scenario: Powering ISO 11898-2/3 compliant CAN FD transceivers in gateways or junction boxes where 3.3V system rails require clean 3.85V bias for driver stages. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator delivering regulated 3.85V with <10mV ripple and fast transient response to handle CAN bus dominant/recessive transitions. Use Value: Eliminates need for external feedback network and reduces BOM count by 4 components versus adjustable boost ICs; 2.0MHz operation avoids AM radio band interference. |
Use Scenario: Generating auxiliary 3.85V supply for LIN transceivers, door lock actuators, and LED drivers in centralized BCMs operating across -40°C to +125°C ambient. IC Role / Device Role / Timing Role: High-reliability point-of-load converter with hiccup-mode short-circuit protection and thermal shutdown to sustain operation during load dump events. Use Value: Factory-trimmed 3.85V output ensures consistent transceiver performance without calibration; True Shutdown™ cuts leakage to <1µA during sleep mode. |
| ADAS Camera Power Rails | Infotainment System USB Peripherals |
Use Scenario: Providing stable 3.85V supply to image sensor bias circuits and serializer ICs in rear-view or surround-view cameras mounted in hot under-hood locations. IC Role / Device Role / Timing Role: Thermally robust boost converter with 41°C/W θJA and exposed pad thermal management - maintains regulation even at 105°C case temperature. Use Value: ±1.5% output accuracy guarantees consistent sensor gain and ADC reference stability; spread-spectrum modulation minimizes EMI coupling into analog video paths. |
Use Scenario: Powering USB-C PD sink controllers or Type-A port regulators in head units where 3.3V main rail must be boosted to 3.85V for USB PHY termination. IC Role / Device Role / Timing Role: Low-noise, fast-transient boost stage placed adjacent to USB controller to suppress switching noise from affecting data integrity. Use Value: 2.0MHz switching allows use of tiny 1µH inductor and avoids audible noise; open-drain RESET synchronizes USB enumeration with power-rail readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20472ATCC/V+T | Same 3.85V output, 500mA rating, and 12-TDFN package, but uses 2.2MHz oscillator (not 2.0MHz) and lacks B-variant skip-mode behavior. | Less suitable for EMI-sensitive CAN systems requiring strict 2.0MHz fundamental; may exhibit higher radiated emissions without spread-spectrum tuning. | Select MAX20472ATCC/V+T only if 2.2MHz compatibility is confirmed in target EMI test plan; otherwise MAX20472BATCC/V+T is preferred for CAN. |
| TPS6109925DSKR | 3.85V fixed-output boost (500mA), 1.2MHz switching, 6-pin WSON package; no spread-spectrum, no RESET output, no automotive temp grade. | Not AEC-Q100 qualified; lacks diagnostic outputs and thermal protection required for automotive body electronics. | Acceptable only for non-automotive industrial or consumer applications where cost is prioritized over reliability and diagnostics. |
Compared with MAX20472ATCC/V+T and TPS6109925DSKR, the MAX20472BATCC/V+T uniquely combines AEC-Q100 qualification, 2.0MHz EMI-optimized switching, factory-set 3.85V output, and integrated RESET with programmable hold time - making it the only drop-in solution for automotive CAN transceiver power in thermally demanding environments.
Availability
MAX20472BATCC/V+T is available at Aetrix Electronics and suitable for automotive point-of-load, CAN transceiver power, and body control module applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX20472BATCC/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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and timing solutions.
The MAX2047x family is designed specifically for automotive power management - delivering compact, high-efficiency, and fault-tolerant DC-DC conversion for CAN, LIN, camera, and infotainment subsystems operating across extended temperature ranges.
FAQ
What is the factory-configured output voltage of the MAX20472BATCC/V+T?
The MAX20472BATCC/V+T has a factory-preset output voltage of 3.85V with ±1.5% accuracy over load, line, and temperature. This fixed setting eliminates external feedback resistors and ensures consistent performance for CAN transceiver biasing without calibration. The value is laser-trimmed during production and cannot be adjusted externally - confirming the 3.85V specification listed in the Ordering Information table for part number MAX20472BATCC/V+T.
How does the MAX20472BATCC/V+T differ from the standard MAX20472 in SYNC pin behavior?
The MAX20472BATCC/V+T (B-variant) differs critically in SYNC pin functionality: when SYNC is grounded or left floating, it remains in skip mode regardless of load current, whereas the non-B MAX20472 automatically switches to FPWM above the skip threshold. This deterministic behavior makes MAX20472BATCC/V+T preferable for EMI-sensitive CAN systems where consistent 2.0MHz operation must be guaranteed only when explicitly enabled via SYNC.
Does the MAX20472BATCC/V+T support spread-spectrum frequency modulation?
Yes, the MAX20472BATCC/V+T supports programmable spread-spectrum frequency modulation with ±3% deviation around its 2.0MHz nominal switching frequency when the SSEN pin is driven high. This feature is factory-enabled and reduces peak radiated emissions - a key requirement for automotive EMC compliance. The modulation is pseudorandom and operates independently of external SYNC signals.
What thermal management features does the MAX20472BATCC/V+T include?
The MAX20472BATCC/V+T incorporates overtemperature protection that shuts down the IC at 165°C (typical) with 15°C hysteresis, plus a thermally enhanced 12-pin TDFN-EP package with exposed pad (θJA = 41°C/W on 4-layer board). The exposed pad must be soldered to a dedicated PGND plane to achieve rated thermal performance - critical for sustained 500mA operation in +105°C under-hood environments.
Can the MAX20472BATCC/V+T be used without an external inductor?
No, the MAX20472BATCC/V+T requires an external 1µH power inductor connected between the LX and PGND pins. The IC integrates synchronous MOSFETs but relies on this external inductor for energy storage and voltage step-up. Using no inductor or incorrect values (e.g., <0.8µH or >1.2µH) will cause regulation failure, excessive ripple, or thermal shutdown - as specified in the Applications Information section of the datasheet for MAX20472BATCC/V+T.
MAX20472BATCC/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-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 4V
- Voltage - Output (Min/Fixed):
- 3.85V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA, 1A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX20472BATCC/V+T FAQ
1.How can I place an order for MAX20472BATCC/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20472BATCC/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 MAX20472BATCC/V+T reliable?
The price and inventory of MAX20472BATCC/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 MAX20472BATCC/V+T is usually 5 days.
3.What payment methods are accepted for MAX20472BATCC/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20472BATCC/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20472BATCC/V+T?
MAX20472BATCC/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20472BATCC/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 MAX20472BATCC/V+T?
For technical support, including MAX20472BATCC/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20472BATCC/V+T requirements.
6.How does Aetrix verify that MAX20472BATCC/V+T is sourced from the original manufacturer or authorized distributors?
All MAX20472BATCC/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 MAX20472BATCC/V+T meets industry standards.
7.What is the process for return or replacement of MAX20472BATCC/V+T?
All MAX20472BATCC/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20472BATCC/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 MAX20472BATCC/V+T part is unused and in its original packaging.
Return procedure for MAX20472BATCC/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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