ISL9003IEFZ-T

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

The ISL9003IEFZ-T is a fixed-output low dropout linear regulator manufactured by Renesas Electronics Corporation. It provides a continuous output current of 150mA with a fixed voltage of 2.5V. The device operates within an input voltage range of 2.3V to 6.5V and maintains a typical quiescent current of 29µA. It features a shutdown current of 0.5µA (typical) and achieves a ripple rejection ratio of 90dB at 1kHz. The unit is housed in a 5-lead SC-70 package and supports an operating temperature range from -40°C to +85°C.

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

• Delivers high performance with excellent transient response to large load steps and superior load regulation.
• Maintains extremely low standby current consumption, making it suitable for battery-powered portable applications.
• Integrates comprehensive protection mechanisms including soft-start, current limit, and thermal shutdown.
• Ensures stability when paired with small ceramic capacitors ranging from 1µF to 4.7µF.

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

• PDAs, cell phones and smart phones
• Portable instruments and MP3 players
• Handheld devices including medical handhelds

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

Verify the specific ordering suffix to confirm the exact output voltage and package configuration before procurement. Confirm that the component meets RoHS compliance standards as specified in the datasheet. Ensure the supplier provides valid traceability documentation for the Intersil/Renesas manufacturing origin. Check for any specific handling requirements related to electrostatic discharge sensitivity during storage and assembly.

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

Select this component when a stable 2.5V rail is required for noise-sensitive circuits in compact designs. Consider its low quiescent current for maximizing battery life in portable electronics. Evaluate the need for external bypass capacitors on the CBYP pin to optimize noise performance. Verify that the input voltage remains within the specified operational limits to ensure proper regulation and UVLO functionality.

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

This part belongs to the ISL9003 family of low noise LDO regulators designed for portable wireless equipment. The manufacturer has recommended the ISL9003A series as a replacement for new designs. The original datasheet indicates the product is not recommended for new designs, suggesting a transition to newer generations within the same functional category.

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

The official datasheet recommends the ISL9003A as the replacement part for new designs.

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

What is the maximum allowable input voltage for the ISL9003?

The absolute maximum supply voltage rating is +7.1V, while the recommended operating range extends up to 6.5V.

How does the enable pin function affect power consumption?

When the EN pin is low, the device enters shutdown mode, drawing a minimum standby current typically less than 0.3µA.

What capacitor values are required for stable operation?

The LDO is stable with output capacitance between 1µF and 4.7µF, provided the ESR is less than 200mΩ.