Analog Devices Inc./Maxim Integrated MAX17504SATP+

Overview

MAX17504SATP+ from Maxim Integrated is a high-efficiency, 4.5V–60V input, synchronous step-down DC-DC converter with dual integrated MOSFETs, delivering up to 3.5A output current and supporting 0.9V to 90% VIN adjustable output voltage. It features internal compensation, ±1.1% FB regulation accuracy over –40°C to +125°C, and operates in PWM/DCM/PFM modes for optimized efficiency across load conditions - used in industrial power supplies and high-voltage single-board systems.

For engineers reviewing the MAX17504SATP+ datasheet, MAX17504SATP+ pinout, MAX17504SATP+ application, or MAX17504SATP+ equivalent, key selection considerations include its 20-pin TQFN (5mm × 5mm) package, programmable soft-start, open-drain RESET output, resistor-programmable EN/UVLO threshold, and support for external synchronization up to 2.2MHz.

Technical Context

The MAX17504SATP+ implements peak-current-mode control with MODE-selectable operation: PWM (constant frequency, all loads), PFM (pulse-skipping, high light-load efficiency), or DCM (no pulse-skipping but disables negative inductor current). Its internal compensation eliminates external loop components across the full output voltage range.

It integrates a 5V LDO (VCC) with 4.75V–5.25V output and 26.5–100mA current limit, dual nMOS power switches (R_DS-ONH = 165–325mΩ, R_DS-ONL = 80–150mΩ), and thermal shutdown at 165°C with 10°C hysteresis. The device supports pre-biased soft-start and hiccup-mode overcurrent protection.

Key Specifications

Pinout & Package

MAX17504SATP+ is housed in a 20-pin, 5mm × 5mm TQFN package with exposed pad (Package Code: T2055+4, Outline Number: 21-0140), RoHS-compliant and lead-free. Thermal resistance θ_JA = 30°C/W (four-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QPWPRQ1 and TPS54360DGQR, the MAX17504SATP+ uniquely combines internal compensation, three selectable control modes, open-drain RESET, and SYNC capability in a single 20-pin TQFN - enabling smaller footprint, faster design cycle, and superior light-load adaptability without sacrificing robustness.

Availability

MAX17504SATP+ is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, and base station power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX17504SATP+ 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, communications, and computing applications.

The MAX17504 product line delivers high-voltage, high-efficiency synchronous buck converters targeting space-constrained, thermally challenging systems requiring wide input range and flexible control architecture.

FAQ

What is the minimum on-time specification for MAX17504SATP+ and how does it affect design?

The MAX17504SATP+ has a minimum on-time of 135ns. This parameter directly constrains the lowest achievable output voltage at high input voltages (e.g., VIN = 48V) when using high switching frequencies - for instance, at 2.2MHz, the theoretical minimum VOUT ≈ VIN × t_ON-MIN × f_SW ≈ 1.4V. Designers must verify that required VOUT/f_SW combinations remain above this boundary to avoid pulse skipping or regulation loss. The MAX17504SATP+ datasheet confirms this value applies specifically to the MAX17504 (not the S variant) and is tested over temperature.

Does MAX17504SATP+ support pre-biased output startup, and how is it enabled?

Yes, MAX17504SATP+ supports pre-biased soft-start. It is enabled automatically when the SS pin voltage starts above 0V at enable time - no additional configuration is required. During startup, the internal soft-start circuit regulates the FB node to ramp the output without drawing reverse current from a pre-charged output capacitor. This behavior is verified in Figures 16–17a of the MAX17504 datasheet and applies identically to the MAX17504SATP+ variant.

What is the function of the CF pin on MAX17504SATP+, and when must it be used?

The CF pin on MAX17504SATP+ is used for optional loop compensation at switching frequencies below 500kHz. When f_SW < 500kHz, a capacitor must be connected from CF to FB to stabilize the control loop; when f_SW ≥ 500kHz, CF is left open. This requirement is explicitly stated in the Pin Description table (page 14) and Loop Compensation section of the MAX17504 datasheet and applies to the MAX17504SATP+ as a member of the MAX17504 family.

How does the MODE pin configure MAX17504SATP+ operation, and what are the voltage thresholds?

The MODE pin on MAX17504SATP+ selects among three control schemes: open = PFM (pulse-frequency modulation), SGND = PWM (pulse-width modulation), VCC = DCM (discontinuous conduction mode). Thresholds are defined relative to VCC: VM-DCM = VCC – 1.6V, VM-PFM = VCC/2, VM-PWM = 1.4V (absolute). These values are specified in the Electrical Characteristics table (page 3) and confirmed for MAX17504SATP+ as a standard MAX17504 variant.

What is the thermal performance of MAX17504SATP+ in a standard four-layer PCB layout?

In a standard four-layer PCB layout per JEDEC JESD51-7, MAX17504SATP+ has θ_JA = 30°C/W and θ_JC = 2°C/W. Continuous power dissipation at T_A = +70°C is 2666.7mW, derating 33.3mW/°C above that. Junction temperature is limited to +150°C, with thermal shutdown activating at +165°C (10°C hysteresis). These values are documented in the Absolute Maximum Ratings and Package Information sections of the MAX17504 datasheet and apply to the MAX17504SATP+ package variant.