Analog Devices Inc./Maxim Integrated MAX20471ATCB/V+T

Overview

MAX20471ATCB/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-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-R_DS(ON) switches. It is used in automotive point-of-load power for CAN transceivers requiring stable, low-noise 5V rails.

For engineers reviewing the MAX20471ATCB/V+T datasheet, MAX20471ATCB/V+T pinout, MAX20471ATCB/V+T application, or MAX20471ATCB/V+T equivalent, key selection criteria include its 5.15V factory-set output, 12-pin TDFN-EP (3mm × 3mm) package with exposed pad, spread-spectrum enable (SSEN), open-drain RESET output, and compatibility with all-ceramic external components.

Technical Context

The MAX20471ATCB/V+T implements current-mode control with forced-PWM (FPWM) and skip-mode operation selected via the SYNC pin. Its internal 2.2MHz oscillator supports spread-spectrum modulation (±3%) when SSEN is high, reducing radiated EMI without external components.

It integrates pMOS and nMOS power switches (R_HS = 150mΩ, R_LS = 100mΩ), a precision UV/OV monitor (93±2% UV, 107±2% OV), and programmable reset timeout options (0.5ms/3.7ms/7.4ms/14.8ms). Charge mode initiates at startup to pre-charge the output to within 600mV of VIN before soft-start begins.

Key Specifications

Pinout & Package

MAX20471ATCB/V+T is housed in a 12-pin TDFN-EP package (3mm × 3mm, outline 21-0664) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (θ_JA = 41°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous boost converter applications.

Compared with MAX20471ATCA/V+T, the MAX20471ATCB/V+T offers 150mV higher output for improved noise margin in CAN FD receivers, while TPS61236RGET trades automotive reliability and diagnostic features for higher current and broader input range - making MAX20471ATCB/V+T optimal for safety-critical 5V rail generation in vehicle networks.

Availability

MAX20471ATCB/V+T is available at Aetrix Electronics and suitable for automotive CAN transceiver power, point-of-load regulation, and microcontroller I/O biasing requiring stable component supply under AEC-Q100 Grade 0/1 conditions.

Supply support for MAX20471ATCB/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.

The MAX20471 series belongs to Analog Devices' automotive power management portfolio, designed specifically for low-voltage, high-precision DC-DC conversion in safety-critical vehicle networks including CAN, LIN, and sensor interfaces.

FAQ

What is the factory-configured output voltage of the MAX20471ATCB/V+T?

The MAX20471ATCB/V+T is factory-configured to deliver a precise 5.15V output. This value is trimmed internally and does not require external feedback resistors. It is optimized for automotive CAN FD transceivers that specify nominal 5V operation with margin for voltage drop and noise - ensuring reliable communication without additional regulation stages. The MAX20471ATCB/V+T maintains this output across its full operating range of −40°C to +125°C.

Does the MAX20471ATCB/V+T support spread-spectrum frequency modulation?

Yes, the MAX20471ATCB/V+T supports spread-spectrum frequency modulation via the SSEN pin. When SSEN is driven high (typically tied to AV), the internal 2.2MHz oscillator dithers ±3% pseudorandomly to reduce peak radiated emissions. This feature is enabled by default in most automotive implementations and helps meet CISPR 25 Class 5 EMI requirements without adding external filtering components. The MAX20471ATCB/V+T does not require configuration registers or external clocks to activate spread spectrum.

How does the RESET output function on the MAX20471ATCB/V+T?

The RESET output on the MAX20471ATCB/V+T is an open-drain, active-low signal that asserts when the OUT voltage falls outside the factory-trimmed UV (93±2%) or OV (107±2%) window. It remains asserted for a user-selectable timeout period (0.5ms, 3.7ms, 7.4ms, or 14.8ms) after regulation is restored. To use it, connect an external pull-up resistor to the system I/O voltage (e.g., 3.3V or 5V). This RESET signal is fully integrated - no external supervisor IC is needed for basic rail monitoring in the MAX20471ATCB/V+T design.

What package type and thermal characteristics does the MAX20471ATCB/V+T use?

The MAX20471ATCB/V+T uses a 12-pin TDFN-EP package (3mm × 3mm, outline 21-0664) with exposed thermal pad. On a standard 4-layer PCB, its junction-to-ambient thermal resistance (θ_JA) is 41°C/W, and junction-to-case (θ_JC) is 8.5°C/W. The exposed pad must be soldered to a solid ground plane for effective heat dissipation and EMI suppression. This package supports AEC-Q100 Grade 0 operation (−40°C to +125°C ambient) and is RoHS-compliant and lead(Pb)-free per the "+" suffix in MAX20471ATCB/V+T.

Can the MAX20471ATCB/V+T operate in both forced-PWM and skip modes?

Yes, the MAX20471ATCB/V+T supports both forced-PWM (FPWM) and pulse-skipping modes via the SYNC pin. When SYNC is pulled high to AV or driven by an external 2.2MHz clock, the device operates in fixed-frequency FPWM mode for consistent EMI profile and fast transient response. When SYNC is left floating or grounded, it enters skip mode under light loads to improve efficiency. The MAX20471ATCB/V+T automatically transitions between modes based on load - no firmware or external control is required to manage this behavior.