MAX17634BATP+

The MAX17634x is a high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operating over an input-voltage range of 4.5V to 36V. It can deliver up to 4.25A current. The MAX17634 is available in three variants: MAX17634A, MAX17634B, and MAX17634C. The MAX17634A and MAX17634B are fixed 3.3V and fixed 5V output voltage parts, respectively. The MAX17634C is an adjustable output voltage (from 0.9V up to 90% of VIN) part. Built-in compensation across the output voltage range eliminates the need for external components. The MAX17634x features peak-current-mode control architecture. The device can be operated in forced pulsewidth modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and lightload conditions. The MAX17634x offers a low minimum on time that allows high switching frequencies and a smaller solution size. The feedback voltage regulation accuracy over -40℃ to +125℃ for the MAX17634x is ±1.3%. The device is available in a compact 20-pin (4mm×4mm) TQFN package. Simulation models are available.

Applications

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

Key features

• Reduces External Components and Total Cost
• No Schottky–Synchronous Operation
• Internal Compensation Components
• All-Ceramic Capacitors, Compact Layout
• Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 36V Input
• Adjustable Output Range from 0.9V up to 90% of VIN
• 400kHz to 2.2MHz Adjustable Frequency with External Synchronization
• Available in a 20-Pin, 4mm×4mm TQFN Package
• Reduces Power Dissipation
• Peak Efficiency of 94%
• PFM and DCM Modes Enable Enhanced LightLoad Efficiency
• Auxiliary Bootstrap Supply (EXTVCC) for Improved Efficiency
• 2.8μA Shutdown Current
• Hiccup-Mode Overload Protection
• Adjustable and Monotonic Startup with Prebiased Output Voltage
• Built-in Output-Voltage Monitoring with RESET
• Programmable EN/UVLO Threshold
• Overtemperature Protection
• High Industrial -40℃ to +125℃ Ambient Operating Temperature Range/-40℃ to +150℃ Junction Temperature Range