STMicroelectronics L4971

The L4971 is a step down monolithic power switching regulator delivering 1.5A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical R_DS(on) of 0.25Ω) to obtain very high efficency and high switching speed.

A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed).

A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications.

Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.

The device is available in plastic dual in line, DIP8 for standard assembly, and SO16W for SMD assembly.

Features

• Protection against feedback disconnection
• Inhibit for zero current consumption
• Soft start function
• Thermal shutdown
• Zero load current operation
• Voltage feedforward
• Up to 1.5A step down converter
• Precise 3.3V (±1%) internal reference voltage
• Operating input voltage from 8V to 55V
• Switching frequency adjustable up to 300KHz
• Internal current limiting (pulse-by-pulse and hiccup mode)
• Output voltage adjustable from 3.3V to 50V

Applications

• Automotive

STSW-eDSim - fast and powerful electrical simulation software for SMPS and analog ICs

eDSim is a fast and powerful electrical simulation tool for SMPS and analog ICs, integrated in the eDesignSuite tool. It features enhanced accuracy and higher convergence speed for SMPS, enabling a simulation time 10-50x faster than the classical analog SPICE simulators.

The tool is a specific version of the SIMPLIS/SIMetrix simulation environment paired with ST model components, for a full electrical simulation with no limitation of nodes and circuit size.

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Software release 2024.12 is now available.

Features

• Built-in interface with eDesignSuite
• SMPS circuit full modeling using ST components
• Time domain simulation
• Control loop stability
• Predefined application use-case simulation
• Schematic editor for customization
• Waveform viewer with measurement capabilities

STEVAL-ISA202V1 - 1.5 A step down switching regulator (VIN = 8 to 55 V) based on L4971

The STEVAL-ISA202V1 product evaluation board provides a platform for evaluation of the L4971, a 1.5 A asynchronous step-down power switching regulator with zero load current operation capability.

Based on the selection of the external components, the device can operate in the entire input voltage range of 8 V < VIN < 55 V. The output voltage is limited by the voltage rating of the output capacitor, so it can be adjusted within the 3.3 V < VOUT < 30 V range through voltage divider R2, R3.

The input and output capacitors are capable of sustaining the RMS current within the operating range.

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