KF33BD-TR

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

The KF33BD-TR is a fixed-output linear low-dropout voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3V output with a maximum current capacity of 500mA. The device operates within an input voltage range up to 20V and features a typical dropout voltage of 0.7V at full load. Key electrical specifications include a quiescent current of 1mA, a maximum supply current of 12mA, and power supply rejection ratios ranging from 80dB at 120Hz to 60dB at 10kHz. It incorporates internal overcurrent and thermal overload protection mechanisms.

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

• Features logic-controlled electronic shutdown functionality compatible with TTL levels for standby power management.
• Incorporates internal current limiting and thermal shutdown protection to ensure operational safety under fault conditions.
• Requires minimal external capacitance, needing only a 2.2 μF capacitor for stability.

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

• Battery-powered systems requiring low noise and low power consumption
• Standby power management controllers in consumer electronics
• Uni-power front panel control in set-top boxes and televisions

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

Verify the specific package type upon ordering, as the KF33BD suffix denotes an 8-SOIC package. Confirm that the required operating temperature range aligns with the -40°C to +125°C specification. Ensure compatibility with the 2.2 μF minimum output capacitance requirement for stable regulation. Check RoHS compliance status if restricted substances are a constraint for the final assembly.

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

Select this component when a fixed 3.3V rail is needed with moderate current drive capabilities up to 500mA. It is suitable for applications where space savings from reduced external components are prioritized. Consider the SO-8 package constraints for thermal dissipation at high loads. Verify that the input voltage does not exceed the 20V absolute maximum rating during transient events.

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

This part belongs to the KFxx series of very low drop voltage regulators designed for low-noise and low-power applications. The series offers various output voltages and packages, including SO-8 and DPAK. The KF33 variant specifically targets 3.3V generation needs in portable and battery-operated devices where efficiency and board space are critical design factors.

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

KF33BDT-TR: A pin-compatible alternative available in the DPAK (TO-252-3) package offering similar electrical characteristics but with different thermal and physical footprint requirements.