4.5V–60V, 2A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power-supply solutions. The MAX17643 high-efficiency, high-voltage, Himalaya synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input. The converter can deliver up to 2A and generates output voltages from 0.9V up to (0.9 x VIN)V. The feedback (FB) voltage is accurate to within ±1.4% over -40°C to +125°C. Built-in compensation across the output- voltage range eliminates the need for external components. The MAX17643 features peak-current-mode control architecture and operates in fixed frequency forced PWM mode. The current-limit settings of the MAX17643 allow the device to supply load-current peaks up to 2A. This allows the device to support pulsed load applications such as communication modules with minimal output-voltage droop. The MAX17643 offers a low minimum on-time that allows high switching frequencies and a smaller solution size.

The device is available in a 12-pin (3mm × 3mm) TDFN 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 * Pulsed-Load Applications * Communication Modules

* Reduces External Components and Total Cost

* No Schottky-Synchronous Operation

* Internal Compensation for Any Output Voltage

* All-Ceramic Capacitors, Compact Layout

* Reduces Number of DC-DC Regulators to Stock

* Wide 4.5V to 60V Input

* Adjustable 0.9V to (0.9 × VIN) Output

* Up to 2A Peak-Load Current

* 400kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization

* Reduces Power Dissipation

* Peak Efficiency of 91.6%

* Auxiliary Bootstrap LDO for Improved Efficiency

* 4.65μA Shutdown Current

* Operates Reliably in Adverse Industrial Environments

* Hiccup-Mode Overload Protection

* Adjustable Soft-Start

* Built-In Output-Voltage Monitoring with Active-Low RESET

* Programmable EN/UVLO Threshold

* Monotonic Startup into Prebiased Load

* Overtemperature Protection

* Wide Industrial -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range

* Complies with CISPR32 (EN55032) Class B Conducted and Radiated Emissions