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Product Detailed Parameters
- Description：IC REG LINEAR 2.1V 150MA 5-TSOP
- Series：-
- Mfr：NXP USA Inc.
- Package：Bulk
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：5.5V
- Voltage - Output (Min/Fixed)：2.1V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.25V @ 150mA (Typ)
- Current - Output：150mA
- Current - Quiescent (Iq)：35 µA
- Current - Supply (Max)：150 µA
- PSRR：75dB (1kHz)
- Control Features：Enable
- Protection Features：Over Current, Transient Voltage
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：SC-74A, SOT-753
- Supplier Device Package：5-TSOP
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Overview
The LD6815TD/21P,125 is a fixed-output Low Dropout Regulator (LDO) from NXP Semiconductors with a nominal output voltage of 2.1 V. It operates within an input voltage range of 2.3 V to 5.5 V and supports a maximum output current of 150 mA. The device features ultra-high Power Supply Rejection Ratio (PSRR) of 75 dB at 1 kHz and low RMS output noise of 40 µV in the 10 Hz to 100 kHz bandwidth. It includes overcurrent protection and utilizes a pull-down switching transistor for auto-discharge functionality when disabled. The regulator is housed in a compact SOT753 (TSOP5) surface-mount package.
Feature Summary
- Auto discharge function via integrated pull-down switching transistor for low-ohmic output state in shutdown mode
- Ultra-high power supply rejection ratio (PSRR) of 75 dB at 1 kHz for effective noise suppression
- Integrated overcurrent protection to safeguard against short circuits and excessive loads
- Low quiescent current consumption of 0.1 µA in shutdown mode
Applications
- Smartphones
- Tablet PCs
- Mobile handsets
- Portable media players
Procurement Notes
Verify the specific suffix 'P' indicates the pull-down output variant rather than the high-ohmic 'H' version. Confirm the '125' suffix aligns with the required temperature grade and packaging specifications. Ensure the ordering code matches the exact 2.1 V output requirement. Cross-reference the datasheet revision date to confirm the latest electrical characteristics are applied.
Selection Notes
Select this component when a stable 2.1 V rail is required for portable electronics with strict noise sensitivity. The high PSRR makes it suitable for RF-sensitive sections in mobile devices. The auto-discharge feature aids in rapid system shutdown and battery conservation. Verify that the external capacitor ESR remains within the specified limits to ensure stability.
Part Context
This part belongs to the LD6815 series of low dropout regulators designed for small-size applications. The series offers various fixed output voltages ranging from 1.2 V to 3.6 V. It shares the same SOT753 package and general electrical architecture as other variants in the family, differing primarily in output voltage and output stage configuration (high-ohmic vs. pull-down).
Replacement Considerations
LD6815TD/21H,125: Identical electrical performance but provides a high-ohmic output state instead of auto-discharge.
