Datasheet MAX17577, MAX17578 (Maxim)

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MAX17577, MAX17578 4.5V to 60V, 1A High-Efficiency, Synchronous, Inverting Output DC-DC Converters General Description Benefits and Features
The Himalaya series of voltage regulator ICs, power mod- ● Reduces External Components and Total Cost ules, and chargers enable cooler, smaller, and simpler • Synchronous Operation power-supply solutions. The MAX17577 and MAX17578 • All-Ceramic Capacitors, Compact Layout are high-efficiency, high-voltage, inverting, Himalaya syn- • Internal Loop Compensation chronous DC-DC converters with integrated MOSFETs • System Ground Referenced I/O Pins (EN/UVLO, and internal compensation. The devices generate output RESET) voltages (VOUT) from -0.9V to -36V and can deliver up to ● Flexibility to Support Multiple Rails in a System 1A of load current from a wide 4.5V to (60V - |VOUT|) in- • Adjustable Output Voltage Range from -0.9V to put-voltage range. -36V The devices feature peak current-mode control architec- • Wide 4.5V to (60V - |VOUT|) Input-Voltage Range ture. The MAX17577 operates in continuous conduction • Up to 1A Output Current mode (CCM) at all loads; thus, providing a constant fre- • 400kHz to 2.2MHz Adjustable Frequency with quency operation. The MAX17578 operates in discontinu- External Clock Synchronization ous conduction mode (DCM) for superior efficiency at light ● Reduces Power Dissipation loads. Low minimum on-time allows higher switching fre- • 90.6% Peak Efficiency quencies and small solution sizes. • DCM for Superior Light-Load Efficiency The devices allow the EN/UVLO, RESET, and RT/SYNC • 6.2μA Shutdown Current pins to be driven by signals that are referenced to system ● Operates Reliably in Adverse Industrial Environments ground, eliminating the need for external-level shifter cir- • Hiccup-Mode Overload Protection cuits. The feedback-voltage regulation accuracy is ±1.3% • Adjustable Soft-Start over a wide -40°C to +125°C temperature range. The de- • Monotonic Startup with Prebiased Output Voltage vices are available in a compact 12-pin (3mm x 3mm) • Built-In Output-Voltage Monitoring with RESET TDFN package. Simulation models are available. • Programmable EN/UVLO Threshold • Overtemperature Protection
Applications
• Wide -40°C to +125°C Ambient Operating ● Industrial Control Power Supply Temperature Range/ -40°C to +150°C Junction ● General-Purpose Point-of-Load Temperature Range ● Gate-Drive Circuits ● Motion Control
Ordering Information appears at end of data sheet.
● Wall-Transformer Regulation ● High-Voltage, Single-Board System
Simplified Application Circuit
V IN RESET IN EN/UVLO BST
MAX17577/ MAX17578
RT/SYNC LX VCC FB FB SS GND FB SOUT EP OUT VOUT 19-100840; Rev 0; 10/20 Document Outline General Description Applications Benefits and Features Simplified Application Circuit Absolute Maximum Ratings Package Information TDFN Electrical Characteristics Electrical Characteristics (continued) Typical Operating Characteristics Typical Operating Characteristics (continued) Pin Configuration MAX17577, MAX17578 Pin Description Pin Description (continued) Functional Diagrams MAX17577/MAX17578 Block Diagram Detailed Description Switching Frequency and External Clock Synchronization Linear Regulator (VCC) Operating Input-Voltage Range Overcurrent Protection (OCP)/Hiccup Mode RESET Output Prebiased Output Thermal-Shutdown Protection Applications Information Inductor Selection Load Current Capability (IOUT(MAX)) Input Capacitor Selection Output-Capacitor Selection Soft-Start Capacitor Selection Adjusting Output Voltage Setting the Input Undervoltage-Lockout Level Inductive Output Short-Circuit Protection Power Dissipation PCB Layout Guidelines Typical Application Circuits -5V Typical Application Circuits Typical Application Circuits (continued) -12V Typical Application Circuit Ordering Information Revision History