Analog Devices Inc./Maxim Integrated MAX20040DATPA/VY+T

Overview

MAX20040DATPA/VY+T from Analog Devices is an automotive-grade synchronous buck-boost DC-DC converter with integrated H-bridge MOSFETs, delivering up to 1.2A output current across a 2V–36V input range while consuming only 52μA quiescent current in standby mode. It features ±2% output voltage accuracy, 2.2MHz programmable switching frequency, and operates over –40°C to +125°C for infotainment power rails and start-stop systems.

For engineers reviewing the MAX20040DATPA/VY+T datasheet, MAX20040DATPA/VY+T pinout, MAX20040DATPA/VY+T application, or MAX20040DATPA/VY+T equivalent, key selection criteria include its 20-pin SWTQFN package, 52μA low-I_Q skip mode (B/D variants), 4.0V–15V adjustable output, 40V load-dump tolerance, and AEC-Q100 qualification for harsh automotive environments.

Technical Context

The MAX20040DATPA/VY+T implements a current-mode controlled buck-boost topology with integrated high-side and low-side DMOS FETs forming an H-bridge architecture, enabling seamless transition between buck and boost modes without external control logic. Its internal 4.6V LDO (VCC) powers control circuitry and supports operation down to 2V input after startup via OUT-to-VCC switchover.

It supports resistor-programmable switching frequency (200kHz–2.2MHz), external clock synchronization (FSYNC), spread-spectrum modulation (±3% f_SW), and dual-mode light-load operation-skip mode for ultra-low I_Q or forced-PWM for EMI control. Protection includes cycle-by-cycle current limiting, thermal shutdown at 166°C, overvoltage lockout (108% V_OUT), and hiccup-mode short-circuit recovery.

Key Specifications

Pinout & Package

Package: 4mm × 4mm, 20-pin side-wettable TQFN (SWTQFN-EP), RoHS-compliant, thermal pad exposed for PCB heat sinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20040BATPA/VY+, the MAX20040DATPA/VY+T offers adjustable output voltage via FB pin, enabling flexible PoL design across multiple subsystems. Against LM61480QRNXTQ1, it delivers smaller total solution size and lower EMI due to integrated H-bridge and spread-spectrum, at the cost of 0.3A lower peak current.

Availability

MAX20040DATPA/VY+T is available at Aetrix Electronics and suitable for infotainment systems, body electronics, start-stop systems, and Power over Coax (PoC) applications requiring stable component supply across automotive production lifecycles.

Supply support for MAX20040DATPA/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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.

The MAX20040DATPA/VY+T belongs to Analog Devices' automotive power management portfolio, designed specifically for robust, low-I_Q DC-DC conversion in harsh vehicle environments with stringent EMI and reliability requirements.

FAQ

What is the maximum output current capability of the MAX20040DATPA/VY+T?

The MAX20040DATPA/VY+T delivers up to 1.2A continuous output current under thermal limits and recommended PCB layout. This rating applies across its full –40°C to +125°C operating temperature range and 2V–36V input range. The device includes cycle-by-cycle current limiting and hiccup-mode short-circuit protection to safeguard against overload conditions without latch-up.

Does the MAX20040DATPA/VY+T support adjustable output voltage, and how is it configured?

Yes, the MAX20040DATPA/VY+T supports adjustable output voltage from 4.0V to 15V using an external resistive divider connected between OUT, FB, and AGND. To configure, calculate R_FB1 = R_FB2 × ((V_OUT/1.25V) − 1) with R_FB2 ≤ 50kΩ (typically 10kΩ). For fixed 5V output, connect FB directly to VCC. The MAX20040DATPA/VY+T's FB pin has 1.25V ±1% reference accuracy and <1μA leakage.

What packaging and thermal characteristics define the MAX20040DATPA/VY+T?

The MAX20040DATPA/VY+T uses a 4mm × 4mm, 20-pin side-wettable TQFN package (T2044Y+4C) with exposed thermal pad. Its thermal resistance is θ_JA = 33°C/W and θ_JC = 2°C/W on a four-layer board. The IC incorporates thermal shutdown at 166°C with 18°C hysteresis and is rated for continuous operation up to +125°C ambient per AEC-Q100 Grade 1.

How does the MAX20040DATPA/VY+T achieve low quiescent current, and which versions support it?

The MAX20040DATPA/VY+T achieves 52μA quiescent current in standby mode through optimized bias circuitry and skip-mode operation enabled via the FSYNC pin. This low-I_Q feature is confirmed for the MAX20040B and MAX20040D variants-including the MAX20040DATPA/VY+T-and is not available in the base MAX20040A version. Shutdown current is further reduced to ≤10μA when EN is pulled low.

Can the MAX20040DATPA/VY+T be synchronized to an external clock, and what are the timing constraints?

Yes, the MAX20040DATPA/VY+T supports external clock synchronization via the FSYNC pin. The applied external clock must be within –10% to 0% of the nominal internal switching frequency set by the FSW resistor. The device locks to the external clock within two cycles and resumes internal oscillation if the FSYNC signal is absent for more than two cycles. Minimum sync pulse width is 100ns.