4.5V to 60V, 1A High-Efficiency, Synchronous, Inverting Output DC-DC Converters

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power-supply solutions. The MAX17577 and MAX17578 are high-efficiency, high-voltage, inverting, Himalaya synchronous DC-DC converters with integrated MOSFETs and internal compensation. The devices generate output voltages (VOUT) from -0.9V to -36V and can deliver up to 1A of load current from a wide 4.5V to (60V - |VOUT|) input- voltage range.

The devices feature peak current-mode control architecture. The MAX17577 operates in continuous conduction mode (CCM) at all loads; thus, providing a constant frequency operation. The MAX17578 operates in discontinuous conduction mode (DCM) for superior efficiency at light loads. Low minimum on-time allows higher switching frequencies and small solution sizes. The devices allow the EN/UVLO, active-low RESET and RT/SYNC pins to be driven by signals that are referenced to system ground, eliminating the need for external-level shifter circuits. The feedback-voltage regulation accuracy is ±1.3% over a wide -40°C to +125°C temperature range. The devices are available in a compact 12-pin (3mm x 3mm) TDFN-EP package. Simulation models are available.Applications

* Industrial Control Power Supply * General-Purpose Point-of-Load * Gate-Drive Circuits * Motion Control * Wall-Transformer Regulation * High-Voltage, Single-Board System

* Reduces External Components and Total Cost

* Synchronous Operation

* All-Ceramic Capacitors, Compact Layout

* Internal Loop Compensation

* System Ground Referenced I/O Pins (EN/UVLO, Active-Low RESET)

* Flexibility to Support Multiple Rails in a System

* Adjustable Output Voltage Range from -0.9V to -36V

* Wide 4.5V to (60V - |VOUT|) Input-Voltage Range

* Up to 1A Output Current

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

* Reduces Power Dissipation

* 90.6% Peak Efficiency

* DCM for Superior Light-Load Efficiency

* 6.2µA Shutdown Current

* Operates Reliably in Adverse Industrial Environments

* Hiccup-Mode Overload Protection

* Adjustable Soft-Start

* Monotonic Startup with Prebiased Output Voltage

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

* Programmable EN/UVLO Threshold

* Complies with CISPR 32 (EN55032) Class B Conducted and Radiated Emissions

* Overtemperature Protection

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