L6933H1.2TR

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

The L6933H1.2TR is a high-performance ultra-low drop output (ULDO) linear regulator manufactured by STMicroelectronics, designed for applications requiring up to 2 A of output current. It operates within an input voltage range of 2 V to 14 V and features an adjustable output voltage from 1.2 V to 5 V with 1% regulation accuracy. The device incorporates an internal N-channel MOSFET with a maximum on-resistance of 200 mΩ and a quiescent current of 200 µA. Key electrical parameters include a ripple rejection of 75 dB at 120 Hz, a fixed upper current limit of 2.5 A, and thermal shutdown protection that activates at 150 °C.

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

• Adjustable soft-start function prevents output voltage overshoot during startup by smoothly ramping the voltage.
• Integrated power good output provides an open-drain signal indicating when the regulated output reaches 90% of its programmed value.
• Inhibit functionality allows the device to be disabled when the control pin voltage drops below 0.5 V.
• Supports multilayer ceramic capacitors (MLCCs) without compromising loop stability due to low equivalent series resistance.

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

• Motherboards and mobile PC systems
• Hand-held instruments
• PCMCIA Cards
• Processors I/O supply
• Chipset and RAM supply

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

Verify component authenticity through authorized channels as this part may have limited availability. Confirm package integrity upon receipt, as the HSOP8 form factor requires proper handling. Ensure compliance with RoHS3 specifications and check moisture sensitivity level (MSL 3) before soldering. Review the datasheet for absolute maximum ratings to prevent damage during installation.

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

Select this regulator for designs needing high efficiency in a linear topology with minimal component count. The internal N-channel MOSFET reduces external parts compared to P-channel alternatives. Consider the 200 mΩ on-resistance for thermal management calculations under full load conditions. Verify that the required output voltage falls within the 1.2 V to 5 V adjustable range defined by the external resistor divider.

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

This component belongs to the L6933 family of ultra-low drop output linear regulators from STMicroelectronics. It is specifically engineered to replace discrete solutions or older regulator types in space-constrained designs. The HSOP8 package provides a compact footprint suitable for surface-mount assembly. The device integrates protection features typically found in more complex power management ICs.

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

Check for direct substitutes within the L6933 family or other ST ULDO regulators with similar current and voltage ratings. Verify pin compatibility and thermal characteristics if replacing with non-ST components. Ensure any alternative supports MLCC capacitors and offers comparable ripple rejection performance.

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

How is the soft-start time determined?

The soft-start time is set by connecting an external capacitor between the SS/INH pin and ground. An internal 5 µA current source charges this capacitor until the voltage reaches approximately 8 V.

What triggers the thermal shutdown?

Thermal shutdown activates when the internal junction temperature reaches 150 °C. The device resumes operation once the temperature decreases by a hysteresis of 20 °C.

Can the device be used with MLCC capacitors?

Yes, the L6933H1.2 supports multilayer ceramic capacitors (MLCCs) for both input and output filtering without affecting loop stability.