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Product Detailed Parameters
- Description：250 MA LOW DROPOUT LDO
- Series：ECOPACK®
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：40V
- Voltage - Output (Min/Fixed)：5V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1V @ 250mA
- Current - Output：250mA
- Current - Quiescent (Iq)：5 µA
- Current - Supply (Max)：90 µA
- PSRR：55dB (1kHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature, Short Circuit
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：6-WDFN Exposed Pad
- Supplier Device Package：6-DFN (2x2)
- Grade：-
- Qualification：-
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Overview
The LDQ40PU50R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a stable 5.0 V output with a guaranteed maximum load current of 250 mA. It operates within an input voltage range of 3.3 V to 40 V and features a typical dropout voltage of 500 mV at full load. The device achieves high accuracy with an output voltage tolerance of ±0.5% at 25 °C and ±1.5% across the operating temperature range. Designed for automotive environments, it holds AEC-Q100 Grade 1 qualification and supports junction temperatures from -40 °C to 150 °C.
Feature Summary
- AEC-Q100 Grade 1 qualified for automotive reliability
- Logic-controlled electronic shutdown with standby current below 0.3 µA
- Integrated Power Good open-drain output signal
- Output active discharge function via internal MOSFET
Applications
- EV powertrain systems
- Always-on battery connected applications
- Infotainment and instrument clusters
- Advanced Driver Assistance Systems (ADAS)
Procurement Notes
Verify that the specific part number matches the required package type, as industrial and automotive grades utilize different physical packages. Confirm the ordering suffix corresponds to the intended output voltage and compliance level. Ensure compatibility with the manufacturer's environmental specifications and ECOPACK standards before finalizing procurement orders.
Selection Notes
Select this component when a robust, space-saving solution is needed for automotive loads requiring up to 250 mA. The DFN6 2x2 package maximizes board space efficiency. Consider the adjustable version if non-standard voltages are required. Ensure external ceramic capacitors meet the specified ESR ranges to maintain loop stability under all operating conditions.
Part Context
This device belongs to the LDQ40 family of high-accuracy low-dropout regulators designed by STMicroelectronics. The series offers various fixed and adjustable output options in compact SOT23-5L and DFN6 packages. It targets applications demanding low quiescent current and high power supply rejection ratios in constrained spaces.
Replacement Considerations
LDQ40PU50RY serves as the wettable flanks automotive-grade equivalent. LDQ40PUR is the standard industrial-grade adjustable alternative. Verify pinout and thermal characteristics when substituting with other LDO families.
FAQ
How does the LDQ40PU50R handle output discharge?
The device includes an output active discharge function using an internal open-drain MOSFET with approximately 75 Ω resistance, which discharges the output capacitor when the enable pin is set to zero.
What protection mechanisms are included?
The regulator incorporates internal current limiting, short-circuit protection, and thermal shutdown. Thermal protection activates at a typical junction temperature of 170 °C.
