4.5V to 36V, 3.5A, 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 MAX17633 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. It can deliver up to 3.5A current. The MAX17633 is available in three variants MAX17633A, MAX17633B, and MAX17633C. The MAX17633A and MAX17633B are the fixed 3.3V and fixed 5V output voltage parts, respectively. MAX17633C 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 MAX17633 features peak-current-mode control architecture. The device can be operated in the forced pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and light-load conditions.

The feedback-voltage-regulation accuracy over -40°C to +125°C for the MAX17633A, MAX17633B, and MAX17633C is ±1.3%. Simulation models are available.

Applications

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

* 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

* Delivers up to 3.5A Over the Temperature Range

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

* Available in a 20-Pin, 4mm × 4mm TQFN Package

* Reduces Power Dissipation

* Peak Efficiency > 93%

* 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

* CISPR 22 Class B Compliant

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