FAN2558S35X

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

The FAN2558S35X is a fixed-output low voltage CMOS Low Dropout (LDO) regulator manufactured by Fairchild Semiconductor, now part of ON Semiconductor. It provides a fixed 3.5V output with a maximum load current of 180mA. The device features 1% output accuracy and incorporates delayed power good indication via an open-drain output. Key protection mechanisms include thermal shutdown and short-circuit current limiting. It operates within an input voltage range of 2.7V to 5.5V and utilizes a 5-lead SOT-23 package.

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

• Provides stable 180mA output current with 1% regulation accuracy
• Integrates thermal shutdown and short-circuit protection for reliability
• Features delayed power good indicator with open-drain output
• Supports fast enable functionality compatible with TTL-level inputs

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

• Processor power-up sequencing
• PCMCIA Vcc and Vpp regulation
• Portable electronic equipment
• Cell phones and PDAs

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

Verify the manufacturer status as Fairchild Semiconductor has been integrated into ON Semiconductor. Confirm if the specific suffix 'X' denotes tape-and-reel packaging or if alternative suffixes are required for your manufacturing process. Check for any recent Product Change Notices (PCN) regarding marking or pinout changes due to the corporate merger.

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

Select this component when a fixed 3.5V rail is required with moderate current demands up to 180mA. Ensure the input voltage remains above the dropout threshold while staying within the 5.5V maximum limit. Verify that the system requires the specific delayed power good feature and that the SOT-23-5 package fits the board layout constraints.

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

This part belongs to the FAN2558/9 family of low voltage CMOS LDOs. The family offers various fixed output voltages and adjustable options. The 'S' in the model number typically indicates the SOT-23-5 package variant, distinguishing it from MLP or other package types within the same electrical family.

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

Direct substitutes include other parts from the FAN2558 series with different fixed output voltages, such as FAN2558S33X or FAN2558S18X, provided the voltage requirement differs. Cross-reference tools should be used to identify equivalent LDOs from ON Semiconductor or other manufacturers with matching 180mA current and SOT-23-5 footprint.

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

What is the typical ground current for the FAN2558S35X?

The typical ground current (Iq) is 100µA.

Is the FAN2558S35X stable with ceramic capacitors?

Yes, the output is stable with a 1µF capacitor having low ESR, specifically stable with 0 to 300mΩ ESR.