Maxim Integrated MAX15462

Description

The MAX15462 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 42V input voltage range. The converter delivers output current up to 300mA at 3.3V(MAX15462A), 5V (MAX15462B), and adjustable output voltages (MAX15462C). The device operates over the -40°C to +125°C temperature range and is available in acompact 8-pin (2mm x 2mm) TDFN package. Simulation models are available.The device employs a peak-current-mode control architecture with a MODE pin that can be used to operate the device in the pulse-width modulation (PWM) or pulsefrequencymodulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to variable switchingfrequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. The low-resistance on-chip MOSFETs ensurehigh efficiency at full load and simplify the PCB layout.To reduce input inrush current, the device offers an internal soft-start. The device also incorporates an EN/ UVLO pin that allows the user to turn on the part at the desired input-voltage level. An open-drain RESET pin canbe used for output-voltage monitoring.

Features

• Eliminates External Components and ReducesTotal Cost
• No Schottky—Synchronous Operation for HighEfficiency and Reduced Cost
• Internal Compensation
• Internal Feedback Divider for Fixed 3.3V, 5VOutput Voltages
• Internal Soft-Start
• All-Ceramic Capacitors, Ultra-Compact Layout
• Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 42V Input Voltage Range
• Fixed 3.3V and 5V Output Voltage Options
• Adjustable 0.9V to 0.89 x VIN Output Voltage Option
• Delivers Up to 300mA Load Current
• Configurable Between PFM and Forced-PWMModes
• Reduces Power Dissipation
• Peak Efficiency = 92%
• PFM Feature for High Light-Load Efficiency
• Shutdown Current = 2.2μA (typ)
• Operates Reliably in Adverse Industrial Environments
• Hiccup-Mode Current Limit and Autoretry Startup
• Built-In Output Voltage Monitoring with Open-DrainRESET Pin
• Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Output
• Overtemperature Protection
• -40°C to +125°C Automotive/IndustrialTemperature Range

Typical applications

• General-Purpose Point of Load
• 4–20mA Current Loops
• High-Voltage LDO Replacement
• Process Control
• Industrial Sensors
• HVAC and Building Control

More information

• Datasheet
• IC product information