L4970 (L4970A) 10A Switching Regulator IC

L4970 (L4970A) 10A Switching Regulator IC

The L4970 (L4970A) is a monolithic step-down (buck) switching regulator IC capable of delivering up to 10A output current with exceptional efficiency and performance. Designed by STMicroelectronics, this IC integrates all necessary control and power components to build compact, reliable, and high-efficiency DC-DC converters.

Operating at a high switching frequency of around 100 kHz, the L4970 allows designers to minimize external component size while maintaining excellent voltage regulation, low ripple, and fast transient response. It features adjustable output voltage from 5.1V up to 40V and supports input voltages up to 50V, making it suitable for a wide range of industrial and automotive power supply applications.

The L4970A operates as a pulse-width modulated (PWM) step-down converter, where an internal NPN power transistor switches the current through an external inductor. The duty cycle is automatically adjusted to maintain a stable output voltage under varying load and input conditions.

An internal error amplifier, oscillator, and PWM comparator control the power stage, while protection circuits provide safe operation under fault conditions. The soft-start feature ensures smooth startup without overshoot, and the remote inhibit input allows the IC to be controlled by logic signals, ideal for intelligent power management systems.

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Features:-

• 10a Output Current
• 5.1v To 40v Output Voltage Range
• 0 To 90% Duty Cycle Range
• Internal Feed-Forward Line Regulation
• Internal Current Limiting
• Precise 5.1v ± 2% On Chip Reference
• Reset And Power Fail Functions
• Soft Start
• Input/Output Sync Pin
• Under Voltage Lock Out With Hysteretic Turn-On
• Pwm Latch For Single Pulse Per Period
• Very High Efficiency
• Switching Frequency Up To 500khz
• Thermal Shutdown
• Continuous Mode Operation

Specifications:-