R1517J331F-T1-FE

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

The R1517J331F-T1-FE is a CMOS-based low dropout regulator featuring a 500 mA output current and a maximum input voltage of 36 V. It provides a fixed 3.3 V output with ±0.8% accuracy at 25°C. The device operates within a temperature range of −40°C to +105°C and includes built-in soft-start, short-circuit current limit, fold-back protection, and thermal shutdown circuits. It utilizes the TO-252-5-P2 package.

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

• Integrates auto-discharge function for rapid output voltage reduction during standby mode
• Features adjustable soft-start time via external capacitor on the DELAY pin
• Supports stable operation with ceramic capacitors as small as 0.1 µF
• Includes constant slope circuit to minimize inrush current and prevent output overshoot

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

• Power source for car accessories
• Power source for home appliances such as refrigerators and rice cookers
• Power source for notebook PCs and digital TVs
• Power source for office equipment including printers and scanners

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

Verify the specific suffix 'F' confirms the inclusion of both the auto-discharge function and the adjustable soft-start capability via the DELAY pin. Ensure the ordering code matches the required TO-252-5-P2 package configuration. Confirm that the fixed 3.3 V output variant aligns with the system design requirements before procurement.

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

Select this component when high input voltage tolerance up to 36 V is required alongside a 500 mA load capacity. The adjustable soft-start feature allows customization of startup behavior to manage inrush currents effectively. The auto-discharge function is critical for applications requiring rapid power-down states. Verify PCB layout supports the thermal performance of the TO-252-5-P2 package.

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

This part belongs to the R1517x series of low dropout regulators manufactured by Nisshinbo Micro Devices. The series is designed for automotive and general electronic applications requiring high input voltage stability. The 'J' designation indicates the TO-252-5-P2 package, while the 'F' suffix specifies the functional variant with auto-discharge and adjustable soft-start capabilities.

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

R1517J331E-T1-FE: Lacks auto-discharge function but retains adjustable soft-start.

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

How is the soft-start time adjusted?

The soft-start time is adjustable by connecting an external capacitor to the DELAY pin.

What is the purpose of the auto-discharge function?

It rapidly lowers the output voltage to 0 V by releasing electrical charge from external capacitors when switching to standby mode.