MAX17503SATP+

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17503/MAX17503S high-efficiency, high-voltage, synchronously rectified stepdown converter with dual integrated MOSFETs operates over a 4.5V to 60V input. It delivers up to 2.5A 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℃ to +125℃ is ±1.1%. The device is available in a compact (4mm×4mm) TQFN-EP 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 conduction 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 MAX17503S offers a lower minimum on-time that allows for higher switching frequencies and a smaller solution size. A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/input undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.

Applications

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

Key features

• Reduces 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 2.5A Over Temperature
• 100kHz to 2.2MHz Adjustable Frequency with External Clock Synchronization
• MAX17503S Allows Higher Frequency of Operation
• Available in a 20-Pin, 4mm x 4mm TQFN-EP Package
• Reduces Power Dissipation Peak Efficiency of 94%
• PFM and DCM Modes for High Light-Load Efficiency
• Shutdown Current = 2.8μA (typ)
• Hiccup-Mode Current Limit and Autoretry Startup
• Built-In Output-Voltage Monitoring (Open-Drain RESET Pin)
• Resistor-Programmable EN/UVLO Threshold
• Adjustable Soft-Start and Prebiased Power-Up
• Wide -40℃ to +125℃ Ambient Operating Temperature Range/-40℃ to +150℃ Junction Temperature Range