RT9018B-1KGSP

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The RT9018B-1KGSP is a high-performance positive voltage regulator designed for applications requiring very low input voltage and ultra-low dropout voltage at up to 3A peak current. It operates with an input voltage as low as 1.4V and a VDD control voltage of 3V, providing an output voltage programmable from 0.8V. The device features a typical dropout voltage of 220mV at 3A and maintains high accuracy with ±1.5% output voltage tolerance. It includes an enable pin to reduce power dissipation during shutdown and provides a Power Good signal indicating when the output reaches 90% of its rating. The part is housed in an SOP-8 (Exposed Pad) package.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Ultra-low dropout performance ideal for applications where output voltage is close to input voltage
• High accuracy output voltage regulation with ±1.5% tolerance
• Integrated Power Good open-drain output indicating valid voltage levels
• Comprehensive protection against thermal overload and overcurrent conditions

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Front Side Bus VTT (1.2V/3A)
• Notebook PC Applications
• Motherboard Applications

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'B' indicates an internal pull-low on the Enable pin, distinguishing it from the 'A' variant which pulls high. Confirm the '1K' suffix corresponds to the 1.05V fixed or adjustable setting. Ensure the 'GSP' designation matches the required SOP-8 Exposed Pad package and Green (Halogen-free) compliance status before finalizing procurement orders.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when system design requires a linear regulator capable of handling peak currents up to 3A with minimal voltage drop. It is suitable for environments needing precise voltage regulation with low quiescent current consumption. Consider the exposed pad requirement for optimal thermal management and ensure the PCB layout supports the necessary copper area to maintain safe operating junction temperatures under maximum load conditions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

The RT9018 series comprises high-performance positive voltage regulators manufactured by Richtek Technology Corporation. This family addresses the need for efficient power management in portable and computing devices where battery life and thermal efficiency are critical. The RT9018B-1KGSP represents a specific configuration within this lineup, offering tailored electrical characteristics and packaging options for integration into complex electronic systems.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

RT9018C

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

How does the RT9018B differ from the RT9018A regarding the Enable pin?

The RT9018B features an internal pull-low on the Enable (EN) pin, meaning the regulator turns off when the pin is floating. In contrast, the RT9018A has an internal pull-high, causing it to turn on when floating.

What is the function of the PGOOD pin?

The PGOOD pin is an open-drain output that signals when the output voltage has reached 90% of its normal rated value, typically after a delay of 1.5ms.