Analog Devices Inc./Maxim Integrated MAX5033DUPA

Overview

MAX5033DUPA from Maxim Integrated is a high-voltage, adjustable-output step-down DC-DC converter with 7.5V–76V input range, 500mA output current capability, fixed 125kHz switching frequency, and internal 0.4Ω high-side DMOS FET - designed for industrial power supplies requiring stable regulation under wide-input conditions.

For engineers reviewing the MAX5033DUPA datasheet, MAX5033DUPA pinout, MAX5033DUPA application, or MAX5033DUPA equivalent, key selection criteria include its adjustable 1.25V–13.2V output, 270μA no-load quiescent current, pulse-skipping light-load mode, thermal shutdown at +160°C, and compatibility with standard buck external components (Schottky diode, 220μH inductor, 0.1μF BST capacitor).

Technical Context

The MAX5033DUPA employs voltage-mode PWM control with voltage feed-forward to maintain regulation across its 10:1 input voltage range. Its integrated high-side DMOS switch and internal frequency compensation eliminate need for external loop compensation components.

It operates in fixed-frequency PWM mode above ~65mA load and automatically transitions to pulse-skipping mode below that threshold - reducing quiescent current to 270μA while sustaining >85% efficiency at 10mA output. Undervoltage lockout (5.2V typ) and hiccup-mode short-circuit protection ensure robust startup and fault recovery.

Key Specifications

Pinout & Package

MAX5033DUPA is housed in an 8-pin plastic DIP (dual in-line package), through-hole mountable, with JEDEC-standard footprint and 110°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down DC-DC converter applications.

Compared with LM5008AMMX/NOPB and TPS54202DRCT, MAX5033DUPA uniquely combines ultra-wide 7.5V–76V input, internal compensation, and sub-300μA quiescent current - making it optimal for ruggedized, low-maintenance industrial buck conversion where simplicity and reliability outweigh raw switching speed or current density.

Availability

MAX5033DUPA is available at Aetrix Electronics and suitable for industrial power supplies, remote monitoring nodes, PLC I/O modules, and automotive body control systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX5033DUPA 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX5033 product line delivers high-voltage, high-efficiency buck converters targeting distributed power architectures where wide input range, low quiescent current, and minimal external component count are essential.

FAQ

What is the maximum output voltage achievable with MAX5033DUPA?

The MAX5033DUPA supports an adjustable output voltage range of 1.25V to 13.2V, set by an external resistor divider connected to the FB pin. The upper limit is constrained by the internal feedback reference of 1.221V and the maximum allowable voltage at the FB pin (12V). For outputs above 12V, careful attention to resistor divider ratio and voltage ratings is required to avoid exceeding absolute maximum ratings on the FB pin. The MAX5033DUPA datasheet confirms this range explicitly for the 'D' variant.

Does MAX5033DUPA require external compensation components?

No, MAX5033DUPA includes fully integrated Type III frequency compensation, eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design, improves consistency across production units, and reduces bill-of-materials cost. The internal compensation is optimized for stability with standard buck output filter configurations - including those using 220μH inductors and 33μF–47μF output capacitors - as validated in Maxim's typical application circuits for MAX5033DUPA.

What is the thermal performance of MAX5033DUPA in its PDIP package?

MAX5033DUPA in the 8-pin PDIP package has a junction-to-ambient thermal resistance (θJA) of 110°C/W per JEDEC 51 standards. At +70°C ambient, its continuous power dissipation limit is 727mW, derating linearly above that temperature. This allows reliable 500mA operation at moderate input-output differentials (e.g., 24V→5V) without forced airflow. Thermal shutdown activates at +160°C junction temperature, with +20°C hysteresis, ensuring safe recovery under overload.

Can MAX5033DUPA operate with input voltages below 7.5V?

No - the absolute minimum input voltage for functional operation of MAX5033DUPA is 7.5V, as specified in its Electrical Characteristics table. Below this, the internal undervoltage lockout (UVLO) prevents startup, and the internal regulator (VD pin) cannot sustain bias. Attempting operation below 7.5V may result in erratic switching, failure to regulate, or undefined behavior. The 5.2V internal UVLO threshold applies only to initial power-up sequencing, not steady-state operation.

What Schottky diode is recommended for use with MAX5033DUPA in a 12V output design?

For a 12V output configuration, the MAX5033DUPA datasheet recommends the 50SQ100 (IR) or MBRM5100 (Diodes Inc.) Schottky rectifier - both rated for ≥100V reverse voltage and ≥5A average forward current. These devices provide low forward voltage (<0.45V at full load) and fast recovery, minimizing conduction loss and preventing unintended turn-on of the internal body diode. The 50SQ100 is explicitly listed in Table 1 and the Typical Application Circuit for MAX5033DUPA designs with VIN up to 76V.