MAX8634ETA+T

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

The MAX8634ETA+T is a dual low-dropout linear regulator from the MAX8633–MAX8636 family, manufactured by Analog Devices Inc./Maxim Integrated. It operates from an input voltage range of 2.7V to 5.5V and delivers up to 300mA output current per channel. The device features pin-programmable outputs with three preset voltage options controlled via a single logic input (P). Key electrical characteristics include a typical quiescent supply current of 54µA, a maximum shutdown current of 1µA, and a typical dropout voltage of 90mV at 100mA load. It incorporates independent shutdown inputs (SHDN1, SHDN2), thermal shutdown protection, and output current limiting. The component is housed in an 8-pin TDFN package (3mm x 3mm) and is specified for operation over an extended temperature range of -40°C to +85°C.

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

• Pin-programmable architecture allows selection of three preset output voltage combinations without external feedback resistors.
• Independent shutdown control inputs enable separate disabling of each regulator to minimize power consumption.
• Integrated thermal overload protection safeguards against excessive junction temperatures.
• Low-noise design suitable for sensitive analog circuits.

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

• Cellular and cordless phones
• PDAs and digital cameras
• Small LCD displays
• Notebook computers
• Wireless LAN cards

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

Verify the specific ordering suffix to confirm the package type and temperature rating. Ensure compatibility with the required output voltage configuration before integration. Confirm lead-free status if RoHS compliance is mandatory for the assembly process. Check for any obsolescence notices or lifecycle changes directly from the manufacturer.

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

Select this component when a dual LDO solution with fixed, pin-selectable voltages is required to reduce bill-of-materials complexity. It is appropriate for battery-powered designs due to its low quiescent current and high efficiency p-channel pass transistors. Consider the TDFN package for higher thermal dissipation needs compared to the µDFN variant.

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

This part belongs to the MAX8633–MAX8636 series of dual 300mA pin-programmable LDOs. While sharing core regulation capabilities, variants differ in shutdown pin configurations, noise bypass features, and reset outputs. The MAX8634 specifically offers independent shutdown controls and a noise bypass pin but lacks the integrated reset function found in other family members.

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

Direct substitutes within the same family include MAX8633ETA+, MAX8635ETA+, and MAX8636ETA+. Verify that alternative parts match the required shutdown pin count and noise specifications, as these features vary across the series.

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

How are the output voltages configured on the MAX8634?

Output voltages are determined at power-up by the state of the single programming input (P). Connecting P to GND, IN, or leaving it open selects one of three preset voltage combinations for OUT1 and OUT2.

Does the MAX8634 have an integrated reset output?

No, the MAX8634 does not feature an integrated reset output. This function is available only on the MAX8633 variant.

What is the purpose of the BP pin on the MAX8634?

The BP pin is a reference noise bypass input. Connecting a 0.01µF capacitor from BP to GND reduces output voltage noise for low-noise applications.