Maxim Integrated MAX17504

Description

The MAX17504 high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs operates over a 4.5V to 60V input. It delivers up to 3.5A and 0.9V to 90% VIN output voltage. Built-in compensation across the output voltage range eliminates the need for external components. The feedback (FB) regulation accuracy over -40°C to +125°C is ±1.1%. The device is available in a compact (5mm x 5mm) TQFN lead (Pb)-free package with an exposed pad. Simulation models are available.

The device features a peak-current-mode control architecture with a MODE feature that can be used to operate the device in pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous mode (DCM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. DCM features constant frequency operation down to lighter loads than PFM mode, by not skipping pulses, but only disabling negative inductor current at light loads. DCM operation offers efficiency performance that lies between PWM and PFM modes. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.

Features

• Eliminates External Components and Reduces Total Cost
• No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
• Internal compensation for Stable Operation at Any Output Voltage
• All Ceramic Capacitor Solution: Ultra-Compact Layout with as Few as Eight External Components
• Reduce Number of DC-DC Regulators to Stock
• Wide 4.5V to 60V Input Voltage Range
• 0.9V to 90% VIN Output Voltage
• Delivers Up to 3.5A Over Temperature
• 200kHz to 2.2MHz Adjustable Frequency with External Synchronization
• Available in a 20-Pin, 5mm x 5mm TQFN Package
• Reduce Power Dissipation
• Peak Efficiency > 90%
• PFM and DCM Modes for High Light-Load Efficiency
• Shutdown Current = 2.8µA (typ)
• Operate Reliably ◦Hiccup-Mode Current Limit and Autoretry Startup
• Built-In Output Voltage Monitoring—(Open-Drain Active-Low RESET Pin)
• Resistor Programmable EN/UVLO Threshold
• Adjustable Soft-Start and Pre-Biased Power-Up
• -40°C to +125°C Operation

Typical applications

• Wall Transformer Regulation
• High-Voltage Single-Board Systems
• Base Station Power Supplies
• Distributed Supply Regulation
• General-Purpose Point-of-Load
• Industrial Power Supplies

More information

• Datasheet
• IC product information