4.5V to 36V, 2.7A, High-Efficiency, Synchronous Step-Down DC-DC Converter

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17644 is a high-efficiency, high-voltage, Himalaya synchronous step-down DC-DC converter with integrated MOSFETs operating over an input-voltage range of 4.5V to 36V. The device can deliver up to 2.7A of current. The MAX17644 is available in three variants: MAX17644A, MAX17644B, and MAX17644C. The MAX17644A and MAX17644B are fixed 3.3V and fixed 5V output parts, respectively. The MAX17644C 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 compensation components.

The MAX17644 features peak-current mode control architecture. The device can be operated in the forced pulse- width modulation (PWM), or pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and light-load conditions. The MAX17644 offers a low minimum on-time that allows high switching frequencies and a smaller solution size.

The feedback-voltage regulation accuracy over -40°C to +125°C for the MAX17644A/MAX17644B/MAX17644C is ±1.2%.The device is available in a 16-pin (3mm x 3mm) 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

* 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 Voltage Range from 0.9V up to 90% of VIN

* Delivers up to 2.7A Over the Temperature Range

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

* Available in a 16-Pin, 3mm x 3mm TQFN Package

* Reduces Power Dissipation

* Peak Efficiency of 95.41%

* PFM and DCM Modes Enable Enhanced Light- Load Efficiency

* Auxiliary Bootstrap Supply (EXTVCC) for Improved Efficiency

* 2.8μA Shutdown Current

* Operates Reliably in Adverse Industrial Environments

* Hiccup-Mode Overload Protection

* Adjustable and Monotonic Startup with Prebiased Output Voltage

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

* Programmable EN/UVLO Threshold

* Overtemperature Protection

* CISPR32 Class B Compliant

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