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Analog Devices Inc./Maxim Integrated MAX20471ATCB/VY+T
- Part No.:
- MAX20471ATCB/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX20471ATCB/VY+T.pdf
- Description:
- IC REG BST 5.15V 500MA/1A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,294
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Product details
Overview
MAX20471ATCB/VY+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-configured 5.15V output at up to 500mA. It features ±1.5% output voltage accuracy over load, line, and temperature (−40°C to +125°C), 2.2MHz fixed-frequency PWM operation, True Shutdown™, and integrated low-RDS(ON) switches for minimal external components. It is used in automotive point-of-load power rails for CAN transceivers requiring stable, low-noise 5.15V supply.
For engineers reviewing the MAX20471ATCB/VY+T datasheet, MAX20471ATCB/VY+T pinout, MAX20471ATCB/VY+T application, or MAX20471ATCB/VY+T equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive operating range (−40°C to +125°C), exact output voltage (5.15V), and real-world design implications of spread-spectrum enable (SSEN), open-drain RESET timing options, and SYNC-controlled PWM/skip mode selection.
Technical Context
The MAX20471ATCB/VY+T implements current-mode control with forced-PWM (2.2MHz) and pulse-skipping modes, enabling robust transient response and light-load efficiency optimization. Its internal oscillator supports programmable spread-spectrum modulation (±3%) via SSEN, reducing radiated EMI without external components.
It integrates pMOS (150mΩ) and nMOS (100mΩ) power switches, supports charge-mode startup (1.7A typical), and includes factory-trimmed UV/OV monitoring (93±2% UV, 107±2% OV) mapped to an open-drain RESET output with selectable hold times (0.5ms/3.7ms/7.4ms/14.8ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.15V factory preset - eliminates external feedback resistors and ensures precise rail for automotive CAN transceivers. |
| Output Current | 500mA continuous - sufficient for dual CAN FD transceivers or multiple low-power microcontrollers. |
| Input Voltage Range | 3.0V to 4.0V - matches automotive battery-supplied 3.3V domain after LDO or direct 12V-derived buck stage. |
| Switching Frequency | 2.2MHz fixed - enables use of small 1µH inductor and all-ceramic capacitors; minimizes EMI in dense PCB layouts. |
| Output Accuracy | ±1.5% over −40°C to +125°C - guarantees reliable regulation across full automotive temperature range without calibration. |
| UV/OV Monitoring | 93±2% UV / 107±2% OV - provides fail-safe reset assertion before system-level brownout or overvoltage damage occurs. |
| Shutdown Current | 0.1–2µA - preserves battery life during vehicle sleep mode with True Shutdown™ disabling output and internal bias. |
Pinout & Package
MAX20471ATCB/VY+T uses a 12-pin SWTDFN-EP package (3mm × 3mm, side-wettable), optimized for automated optical inspection (AOI) and thermal performance (θJA = 41°C/W on 4-layer board). The exposed pad must be soldered to ground for thermal dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SSEN | Spread-Spectrum Enable | Logic-high enables ±3% pseudorandom frequency dithering to reduce peak radiated emissions; tied to AV for activation. |
| 2 OUTS | Output Voltage Feedback | Connects directly to output capacitor; sets regulation point via internal trim - no external resistor divider required. |
| 3 OUT | Regulated Output | Delivers 5.15V at up to 500mA; requires 22µF ceramic output capacitor for stability and ripple suppression. |
| 4,5 LX | Switch Node | High-current connection to inductor; carries pulsed 2.5A RMS; layout must minimize loop area to reduce EMI and switching losses. |
| 6 PGND | Power Ground | Low-impedance return path for high-side/nMOS switch currents; separate from analog ground to avoid noise coupling. |
| 7 RESET | Open-Drain Reset Output | Asserts low when OUT falls below 93% or rises above 107% of 5.15V; requires external pull-up for logic-level interface. |
| 8 GND | Ground Reference | Must be connected to EP and system ground plane; forms reference for analog circuitry and bias generation. |
| 9 AGND | Analog Ground | Isolated ground pin for precision reference and error amplifier; ties to GND and EP but avoids noisy power return paths. |
| 10 AV | Analog Power Supply | 3.0–4.0V analog rail; decoupled with 1µF X7R ceramic; powers internal reference, comparators, and control logic. |
| 11 EN | Active-High Enable | Logic-high >1.5V enables converter; internal 100mV hysteresis prevents chatter near threshold; pulls down to 0.5–2µA in shutdown. |
| 12 SYNC | Mode Control Input | GND or floating enables skip mode at light loads; AV or external clock forces 2.2MHz FPWM for predictable EMI profile. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Drives OUT to 0V and disables internal bias - eliminates standby leakage and enables clean system power sequencing. |
| Factory-Trimmed Output | 5.15V preset in 50mV steps - removes external feedback network, saves board space, and guarantees accuracy without calibration. |
| Integrated Low-RDS(ON) Switches | pMOS = 150mΩ, nMOS = 100mΩ - achieves >93% efficiency at 500mA/5.15V, reduces thermal stress vs. discrete solutions. |
| Selectable RESET Hold Time | 0.5ms / 3.7ms / 7.4ms / 14.8ms - configurable via OTP bits to match host MCU reset timeout requirements. |
| Charge-Mode Startup | 1.7A current source - rapidly precharges output to within 600mV of input before soft-start, preventing brownout during enable. |
Applications
| Automotive CAN Transceiver Power | ADAS Camera Module Bias Rail |
|---|---|
Use Scenario: Powers ISO 11898-2/3 compliant CAN FD transceivers in body control modules where 5.15V is required for VCC and fault detection thresholds. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator delivering regulated 5.15V from 3.3V domain; RESET monitors output integrity for CAN controller fault signaling. Use Value: ±1.5% output accuracy ensures transceiver operates within spec across temperature; 2.2MHz switching avoids AM band interference. |
Use Scenario: Supplies image sensor bias voltage in rear-view or surround-view cameras where compact size and low EMI are critical. IC Role / Device Role / Timing Role: Point-of-load converter generating clean 5.15V from vehicle's 3.3V domain; SSEN-enabled spread spectrum suppresses radiated emissions near CMOS sensor lines. Use Value: SWTDFN-EP package enables AOI-compatible assembly; 125°C rating supports under-hood camera placement. |
| Automotive Infotainment USB Port | Telematics LTE Modem Power |
Use Scenario: Provides 5.15V to USB 2.0 PHY in head unit systems where USB enumeration must survive cold-cranking dips. IC Role / Device Role / Timing Role: High-transient-response boost regulator with 1.9ms soft-start and charge-mode precharge; RESET signals host MCU if output collapses. Use Value: 2.2MHz FPWM ensures fast load-step recovery (<10µs); ±1.5% accuracy maintains USB voltage compliance during battery sag. |
Use Scenario: Powers LTE modem RF section requiring stable 5.15V during data bursts in telematics control units (TCUs). IC Role / Device Role / Timing Role: Efficient boost converter operating in skip mode during idle and FPWM during transmission; SYNC pin allows dynamic mode switching. Use Value: 500mA capability supports peak LTE transmit current; -40°C to +125°C rating ensures reliability in sealed TCU enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20471ATCA/VY+T | Same 12-pin SWTDFN-EP package and 500mA rating, but factory-set to 5.00V output (vs. 5.15V). | Suitable where 5.00V is required for legacy CAN transceivers or USB PHYs with tighter tolerance. | Select when exact 5.00V is mandated; otherwise, MAX20471ATCB/VY+T's 5.15V better matches newer CAN FD specs. |
| MAX20472ATCB/VY+T | Same footprint and 5.15V output, but rated for 1A output (vs. 500mA) and higher current-limit (4.2A vs. 1.8A). | Required for multi-rail CAN clusters or systems powering both transceiver and isolated gate drivers. | Choose only if >500mA load current is confirmed; higher current capability increases cost and thermal footprint unnecessarily for single-transceiver use. |
Compared with MAX20471ATCA/VY+T, the MAX20471ATCB/VY+T delivers 150mV higher output for improved noise margin in CAN FD receivers; versus MAX20472ATCB/VY+T, it offers lower quiescent current and smaller thermal solution for cost-sensitive 500mA applications.
Availability
MAX20471ATCB/VY+T is available at Aetrix Electronics and suitable for automotive point-of-load, CAN transceiver power, and ADAS camera bias rail applications requiring stable component supply, AEC-Q200-aligned qualification, and side-wettable packaging for automated optical inspection.
Supply support for MAX20471ATCB/VY+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.
The MAX20471 is part of Analog Devices' automotive-qualified power management portfolio, designed specifically for low-voltage, high-precision boost conversion in safety-critical vehicle subsystems such as CAN networks and vision systems.
FAQ
What is the factory-configured output voltage of the MAX20471ATCB/VY+T?
The MAX20471ATCB/VY+T is factory-configured to deliver a precise 5.15V output - a value selected to meet the upper voltage margin requirements of modern CAN FD transceivers while maintaining compatibility with 5V-tolerant I/O. This setting is laser-trimmed and does not require external feedback components. The 5.15V output remains stable within ±1.5% across −40°C to +125°C, load, and line variations. No configuration pins or registers are needed to set or verify this voltage.
Does the MAX20471ATCB/VY+T support spread-spectrum operation, and how is it enabled?
Yes, the MAX20471ATCB/VY+T supports spread-spectrum frequency modulation (±3%) to reduce peak radiated EMI. It is enabled by driving the SSEN pin high (to AV), which activates the internal pseudorandom dithering of the 2.2MHz oscillator. When SSEN is low or floating, spread spectrum is disabled and the device operates at nominal frequency. This feature requires no external components and is fully integrated - the dither pattern is factory-set and non-adjustable.
What is the function of the RESET pin on the MAX20471ATCB/VY+T, and how is its timeout configured?
The RESET pin on the MAX20471ATCB/VY+T is an open-drain, active-low output that asserts when the 5.15V output falls below 93% (4.79V) or rises above 107% (5.51V) of nominal. Its hold time after regulation is factory-programmed to one of four values: 0.5ms, 3.7ms, 7.4ms, or 14.8ms. This selection is fixed per part number and cannot be changed in-circuit. For MAX20471ATCB/VY+T, the hold time is 3.7ms - matching common microcontroller reset timeout requirements in automotive ECUs.
How does the SYNC pin affect operating mode in the MAX20471ATCB/VY+T?
In the MAX20471ATCB/VY+T, the SYNC pin selects between two core operating modes: when SYNC is grounded or left floating, the device enters skip mode under light loads for maximum efficiency; when SYNC is pulled high to AV (or driven by an external 2.2MHz clock), it forces fixed-frequency PWM (FPWM) mode for consistent EMI behavior and faster transient response. Unlike the MAX20472B variant, the MAX20471ATCB/VY+T automatically transitions between modes based on load - no firmware control is needed.
What package type and thermal characteristics apply to the MAX20471ATCB/VY+T?
The MAX20471ATCB/VY+T uses a 12-pin SWTDFN-EP package (3mm × 3mm) with side-wettable leads for automated optical inspection and enhanced solder-joint reliability. Its thermal resistance is θJA = 41°C/W on a standard 4-layer PCB. The exposed pad must be soldered to a solid ground plane to achieve this rating. This package supports continuous operation from −40°C to +125°C ambient, with junction temperature limited to +150°C and thermal shutdown activating at +165°C.
MAX20471ATCB/VY+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):
- 5.15V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA, 1A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-TDFN-EP (3x3)
MAX20471ATCB/VY+T FAQ
1.How can I place an order for MAX20471ATCB/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20471ATCB/VY+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 MAX20471ATCB/VY+T reliable?
The price and inventory of MAX20471ATCB/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20471ATCB/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20471ATCB/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20471ATCB/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20471ATCB/VY+T?
MAX20471ATCB/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20471ATCB/VY+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 MAX20471ATCB/VY+T?
For technical support, including MAX20471ATCB/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20471ATCB/VY+T requirements.
6.How does Aetrix verify that MAX20471ATCB/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20471ATCB/VY+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 MAX20471ATCB/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20471ATCB/VY+T?
All MAX20471ATCB/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20471ATCB/VY+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 MAX20471ATCB/VY+T part is unused and in its original packaging.
Return procedure for MAX20471ATCB/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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