Analog Devices Inc./Maxim Integrated MAX20039BATPB/VY+

Overview

MAX20039BATPB/VY+ from Analog Devices is an automotive-grade synchronous buck-boost DC-DC converter with integrated H-bridge MOSFETs, delivering up to 0.6A output current across a 2V–36V input range, operating at up to 2.2MHz switching frequency, and supporting fixed 5V or adjustable 4V–15V output voltage - used in infotainment power rails and start-stop system PoL supplies.

For engineers reviewing the MAX20039BATPB/VY+ datasheet, MAX20039BATPB/VY+ pinout, MAX20039BATPB/VY+ application, or MAX20039BATPB/VY+ equivalent, key selection considerations include its AEC-Q100 qualification, 52μA standby quiescent current, 20-pin side-wettable TQFN package, integrated BST drivers, and programmable spread-spectrum EMI reduction - all critical for cold-crank resilient automotive power design.

Technical Context

The MAX20039BATPB/VY+ implements a current-mode controlled buck-boost topology with dual switching nodes (LX1, LX2) and integrated high-side/low-side DMOS FETs forming an H-bridge architecture. It supports both fixed-frequency PWM and skip-mode operation via the FSYNC pin, enabling efficiency optimization across load ranges from microamps to 600mA.

Its control loop uses an internal transconductance error amplifier (gm = 450–1000μS) with external COMP network compensation, and features cycle-by-cycle current limiting (ILIMIT2 = 0.9–1.25A), overvoltage protection (105.5–110.8% VOUT), and thermal shutdown at 166°C with 18°C hysteresis - all validated for -40°C to +125°C ambient operation.

Key Specifications

Pinout & Package

MAX20039BATPB/VY+ is housed in a 20-pin, 4mm × 4mm side-wettable TQFN package (package code T2044Y+4C) with exposed thermal pad. Pin numbering follows standard top-down view with Pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20040BATPB/VY+, the MAX20039BATPB/VY+ offers lower cost and matched performance for ≤0.6A loads, while LM61480-Q1 trades integration for higher current and design flexibility - making MAX20039BATPB/VY+ the optimal choice for space- and BOM-constrained automotive PoL applications.

Availability

MAX20039BATPB/VY+ is available at Aetrix Electronics and suitable for infotainment systems, body electronics modules, and start-stop power management requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for MAX20039BATPB/VY+ 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 MAX20039/MAX20040 product line was designed specifically for automotive power management, emphasizing cold-crank resilience, ultra-low quiescent current, and integrated H-bridge architecture to simplify PoL conversion in space-constrained ECU designs.

FAQ

What is the minimum input voltage required for startup of the MAX20039BATPB/VY+?

The MAX20039BATPB/VY+ requires a minimum input voltage of 3.5V to initiate startup. Once the internal bias regulator is enabled and the output reaches regulation, the device sustains operation down to 2V input - enabling functionality during automotive cold-crank conditions. This two-stage input behavior is explicitly defined in the Recommended Operating Conditions table of the datasheet.

Does the MAX20039BATPB/VY+ support remote output voltage sensing?

Yes, the MAX20039BATPB/VY+ supports remote output voltage sensing via the OUT_S pin (Pin 16). This Kelvin sense input allows direct connection to the load to compensate for IR drop across PCB traces, improving output regulation accuracy to ±2% under varying load currents. The internal feedback loop compares OUT_S to the FB pin voltage, not the local OUT node.

Can the MAX20039BATPB/VY+ be synchronized to an external clock source?

Yes, the MAX20039BATPB/VY+ supports external clock synchronization via the FSYNC pin (Pin 11). When driven with a clean CMOS clock signal within -10% of the nominal internal switching frequency (e.g., 1.98MHz for a 2.2MHz setting), the device locks to the external clock within two cycles. Spread-spectrum modulation is automatically disabled during synchronization.

What is the purpose of the two separate PGND pins (PGND1 and PGND2) on the MAX20039BATPB/VY+?

The MAX20039BATPB/VY+ features separate PGND1 (Pin 14) and PGND2 (Pin 1) to isolate the return paths of the buck-stage and boost-stage low-side FETs. This separation prevents high di/dt switching currents from one stage from injecting noise into the other stage's ground reference, thereby improving stability, reducing output ripple, and minimizing EMI coupling - especially critical in buck-boost topologies with bidirectional power flow.

How does the MAX20039BATPB/VY+ handle short-circuit conditions?

The MAX20039BATPB/VY+ employs hiccup-mode short-circuit protection: if the DH1 current limit is triggered 16 consecutive times while output voltage falls below 60% of regulation, the device halts switching and enters autoretry mode with a 26ms (typ) retry interval. This protects internal FETs and external magnetics from thermal damage while allowing automatic recovery once the fault clears - a behavior confirmed in the Detailed Description section of the datasheet.