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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 250MA 6-DFN
- Series：-
- 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)：1.8V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1V @ 250mA
- Current - Output：250mA
- Current - Quiescent (Iq)：5 µA
- Current - Supply (Max)：500 µA
- PSRR：55dB (1kHz)
- Control Features：Current Limit, 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：Automotive
- Qualification：AEC-Q100
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Overview
The LDQ40PU18RY is a high-accuracy, fixed-output low-dropout linear regulator from STMicroelectronics. It provides a stable 1.8 V output with a guaranteed maximum load current of 250 mA. The device 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. It is housed in a compact DFN 2x2 6L package with wettable flanks, designed for automotive-grade reliability under AEC-Q100 Grade 1 standards. The operating junction temperature range spans from -40 °C to +150 °C.
Feature Summary
- AEC-Q100 Grade 1 qualified for automotive environments
- Logic-controlled electronic shutdown with standby current below 0.3 µA
- Integrated Power Good open-drain output signal
- Output active discharge function upon disable
Applications
- EV powertrain systems
- Always-on battery connected applications
- Infotainment and instrument clusters
- Advanced Driver Assistance Systems (ADAS)
Procurement Notes
Verify the specific ordering code LDQ40PU18RY against the manufacturer's official documentation to confirm the fixed 1.8 V output configuration. Ensure the selected package variant matches the required automotive grade specifications. Cross-reference the datasheet revision history to validate the most current electrical characteristics and thermal data before finalizing procurement.
Selection Notes
Select this component when a precise 1.8 V rail is required for sensitive automotive loads. The wide input voltage capability up to 40 V accommodates varying supply conditions. The small DFN footprint is suitable for space-constrained designs. Verify that the external ceramic capacitor values meet the stability requirements specified in the application information section of the datasheet.
Part Context
The LDQ40 series comprises high-precision LDO regulators designed for low-power battery-operated applications. Available in SOT23-5L and DFN 2x2 6L packages, the series offers both fixed and adjustable output options. The PU suffix indicates the DFN 2x2 6L package format, while the RY suffix denotes the specific output voltage and packaging type within the product line.
Replacement Considerations
LDQ40PU25RY
FAQ
What is the purpose of the ADJ pin on the LDQ40PU18RY?
The LDQ40PU18RY is a fixed-output version; therefore, it does not utilize the ADJ pin for voltage adjustment. The ADJ pin is present on the adjustable versions of the LDQ40 series.
How does the Power Good feature function?
The Power Good (PG) pin is an open-drain output that goes low when the output voltage drops below the valid threshold. It remains high-impedance when the output is within the valid range or when the device is disabled.
