LD57100J330R

Overview

The LD57100J330R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a nominal output voltage of 3.3 V with a guaranteed maximum load current of 1 A. It utilizes an NMOS pass transistor biased by a dedicated pin to achieve ultra-low dropout performance, typically 40 mV at full load. The device operates with an input voltage range extending from the output voltage up to 5.5 V and requires a separate bias supply between 3.0 V and 5.5 V. It features high accuracy with ±1% output voltage tolerance over the temperature range and includes logic-controlled shutdown for ultra-low standby consumption.

Feature Summary

• Ultra-low dropout voltage achieved through dedicated gate biasing of the NMOS pass element
• Logic-controlled electronic shutdown enabling total current consumption below 0.1 µA
• Integrated thermal protection and internal current limiting for robust operation
• Output active discharge function to rapidly remove charge when disabled

Applications

• Smartphones
• Cameras
• Low voltage, low noise post regulation

Procurement Notes

Verify the specific ordering code LD57100J330R against the manufacturer's official datasheet DS13123 Rev 6 to confirm the 3.3 V fixed output specification. Ensure compatibility with the required Flip Chip6 (0.8x1.2 mm) package footprint during PCB layout. Confirm that the application circuit provides the necessary external ceramic capacitors and bias voltage conditions as defined in the recommended operating parameters.

Selection Notes

Select this component for battery-operated applications requiring high efficiency at low input-to-output differentials. The dedicated bias pin allows the use of lower input voltages compared to standard LDOs, provided the bias rail meets the minimum 3.0 V requirement. Designers must account for the specific thermal resistance and ensure adequate heat dissipation within the compact Flip Chip6 package to maintain junction temperatures within the specified operating range.

Part Context

The LD57100 series belongs to STMicroelectronics' portfolio of power management integrated circuits, specifically designed as ultra-low-dropout regulators. This family emphasizes space-saving packaging and low quiescent current to extend battery life in portable electronics. The J330 suffix identifies the specific variant within the series configured for a fixed 3.3 V output, distinguishing it from adjustable or other fixed voltage options.

Replacement Considerations

LD57100J330R

FAQ

How does the LD57100J330R handle output discharge?

The device integrates a MOSFET between VOUT and GND that activates when the EN pin goes low, quickly discharging the output capacitor upon shutdown.

What is the purpose of the VBIAS pin?

The VBIAS pin supplies the internal driving and control circuitry, allowing the NMOS pass transistor gate to be properly biased for ultra-low dropout performance even at low input voltages.