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NXP Semiconductors LD6815TD/21P,125
- Part No.:
- LD6815TD/21P,125
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD6815TD/21P,125.pdf
- Description:
- IC REG LINEAR 2.1V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:75,000
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Product details
Overview
LD6815TD/21P,125 from NXP Semiconductors is a fixed-output 2.1 V, 150 mA low-dropout linear regulator with ultra-high PSRR (75 dB at 1 kHz), 250 mV dropout at full load, and auto-discharge functionality via integrated pull-down transistor. It operates from 2.3 V to 5.5 V input and delivers ultra-low noise (40 µV RMS, 10 Hz–100 kHz) for powering sensitive analog and RF circuitry in portable electronics.
For engineers reviewing the LD6815TD/21P,125 datasheet, LD6815TD/21P,125 pinout, LD6815TD/21P,125 application, or LD6815TD/21P,125 equivalent, key selection criteria include its 2.1 V fixed output, SOT753 package compatibility, 150 µs startup time, 0.1 µA shutdown current, and auto-discharge capability - critical for battery-powered systems requiring fast output discharge during disable.
Technical Context
The LD6815TD/21P,125 integrates a PMOS pass transistor enabling low dropout and high PSRR performance across 1 kHz–100 kHz. Its enable input (EN) is active-HIGH with TTL-compatible thresholds (VIH ≥ 1.1 V, VIL ≤ 0.4 V), and it features internal overcurrent protection plus thermal shutdown.
Unlike high-ohmic variants (e.g., LD6815TD/21H), the /21P suffix denotes an integrated 100 Ω pull-down transistor that actively discharges the output capacitor during disable mode, achieving 300 µs shutdown time (VOUT → 5% VO(nom)) with 1 µF load capacitance - eliminating need for external discharge circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.1 V ±3% over −40 °C to +85 °C ambient; ensures stable core/bias rail for 2.1 V logic or analog subsystems. |
| Max output current | 150 mA continuous; supports power delivery to multiple low-power peripherals without thermal derating under typical PCB layout. |
| Dropout voltage | 250 mV at 150 mA; enables operation down to VIN = 2.35 V while maintaining regulation - critical for single-cell Li-ion or Li-poly battery systems. |
| PSRR | 75 dB at 1 kHz; suppresses switching noise from upstream DC-DC converters, preserving signal integrity in audio/RF sections. |
| RMS output noise | 40 µV (10 Hz–100 kHz); minimizes phase jitter in clocked circuits and noise floor degradation in precision ADCs/DACs. |
| Quiescent current | 0.1 µA in shutdown (VEN ≤ 0.4 V); extends battery life in always-on standby modes of mobile devices. |
| Startup time | 150 µs to 95% VO(nom); supports fast wake-up sequences in power-managed SoC subsystems. |
Pinout & Package
SOT753 (TSOP5) plastic surface-mount package, 2.9 × 1.5 × 1.0 mm, 5-pin configuration with standard lead pitch (0.95 mm) and exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.3–5.5 V supply; requires ≥0.7 µF input capacitor for stability and transient response. |
| 2 GND | Ground reference | Common return path for input, output, and enable; must connect directly to low-impedance ground plane. |
| 3 EN | Enable control | Active-HIGH logic input; drives internal pass transistor and pull-down switch; VIH ≥ 1.1 V required for regulation. |
| 4 n.c. | No connection | Internally unconnected; must remain floating - no external tie or routing permitted. |
| 5 OUT | Regulated output | Delivers 2.1 V ±3%; integrates 100 Ω pull-down for auto-discharge when EN = LOW. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor discharges output to 5% VO(nom) in 300 µs - eliminates need for external MOSFET or resistor network. |
| Ultra-low shutdown current | 0.1 µA max at VEN ≤ 0.4 V - reduces leakage current in battery-backed systems during deep sleep. |
| High PSRR architecture | 75 dB rejection at 1 kHz achieved via optimized error amplifier and PMOS pass device - maintains clean output under noisy input conditions. |
| ESD robustness | 6 kV HBM rating per JESD22-A114 - withstands handling and board assembly without additional protection circuitry. |
| Stable with ceramic capacitors | Designed for 0.7–1.0 µF X7R MLCCs (ESR 5–500 mΩ); avoids tantalum or electrolytic dependencies for space-constrained designs. |
Applications
| Smartphone Core Power | Tablet PC Audio Codec Supply |
|---|---|
Use Scenario: Powers 2.1 V I/O or auxiliary logic rails in smartphone application processors during active and suspend states. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.1 V with fast enable/disable timing and auto-discharge to meet Android suspend/resume latency requirements. Use Value: Eliminates external discharge FET, reducing BOM count and PCB area while ensuring rapid rail collapse to prevent back-powering of disabled subsystems. | Use Scenario: Supplies clean 2.1 V bias to high-fidelity audio codecs in tablets, where PSRR and noise directly impact SNR. IC Role / Device Role / Timing Role: Low-noise, high-PSRR post-regulator filtering switching converter ripple before audio DAC/ADC stages. Use Value: 40 µV RMS noise and 75 dB PSRR preserve >100 dB SNR in 24-bit audio paths without added LC filtering. |
| Digital Still Camera Sensor Bias | Portable Media Player RF Front-End |
Use Scenario: Provides stable 2.1 V supply to CMOS image sensor analog front-end and PLL circuits in compact DSC modules. IC Role / Device Role / Timing Role: Precision LDO with tight output accuracy (±3%) and low drift over temperature supporting sensor calibration stability. Use Value: ±3% output tolerance ensures consistent sensor gain and white balance accuracy across −40 °C to +85 °C operating range. | Use Scenario: Powers 2.1 V local oscillator and mixer bias in Bluetooth/Wi-Fi combo modules within portable media players. IC Role / Device Role / Timing Role: Ultra-low-noise LDO isolating RF circuitry from noisy system power rails. Use Value: 40 µV RMS noise prevents reciprocal mixing and phase noise degradation in sub-GHz ISM band receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD6815TD/21H,125 | Same 2.1 V output, but high-ohmic (3-state) output in disable mode - no auto-discharge. | Requires external discharge path for fast rail collapse; unsuitable where rapid output discharge is mandatory. | Select /21H only if system uses external discharge control or tolerates slower output decay. |
| Torex XC6219B212MR-G | 2.1 V fixed output, 150 mA, SOT-23-5 package; PSRR = 65 dB @ 1 kHz; no integrated auto-discharge. | Lacks pull-down transistor; higher noise (50 µV RMS); smaller footprint but lower thermal performance. | Choose for space-constrained layouts where auto-discharge is handled externally and PSRR margin >10 dB is acceptable. |
Compared with LD6815TD/21H,125 and XC6219B212MR-G, the LD6815TD/21P,125 uniquely combines 2.1 V regulation, 75 dB PSRR, and integrated 100 Ω pull-down - enabling faster, simpler, and more reliable power sequencing in battery-critical portable designs without added components.
Availability
LD6815TD/21P,125 is available at Aetrix Electronics and suitable for smartphone core power, tablet audio codec supply, digital still camera sensor bias, portable media player RF front-end, and other portable electronics applications requiring stable component supply with guaranteed long-term availability.
Supply support for LD6815TD/21P,125 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.
The LD6815 series was designed specifically for ultra-low-noise, high-PSRR power management in space-constrained portable electronics - emphasizing fast enable/disable timing, minimal external components, and robust operation across wide temperature and input voltage ranges.
FAQ
What is the output voltage tolerance of the LD6815TD/21P,125 over temperature?
The LD6815TD/21P,125 guarantees ±3% output voltage accuracy over the full operating ambient temperature range of −40 °C to +85 °C. At +25 °C, the tolerance tightens to ±0.5%, ensuring precise biasing for sensitive analog circuits. This specification is verified per NXP's Product data sheet Rev. 2 (December 2012) and applies to the LD6815TD/21P,125 under recommended operating conditions with 1 µF output capacitance.
Does the LD6815TD/21P,125 require an input capacitor?
Yes, the LD6815TD/21P,125 requires a minimum 0.7 µF ceramic input capacitor (X7R, ±30% tolerance) placed close to the IN and GND pins to ensure stability and suppress input transients. The recommended value is 1.0 µF, matching the test condition used for startup time (150 µs) and PSRR (75 dB) specifications in the LD6815TD/21P,125 datasheet.
How does the auto-discharge function work in the LD6815TD/21P,125?
When the EN pin is driven LOW (≤0.4 V), the LD6815TD/21P,125 activates an internal 100 Ω pull-down transistor between OUT and GND, discharging the output capacitor to 5% of VO(nom) in 300 µs (with 1 µF CL). This eliminates reliance on external discharge components and ensures safe, rapid rail collapse - a key feature distinguishing the LD6815TD/21P,125 from high-ohmic variants like LD6815TD/21H.
What is the maximum allowable input voltage for the LD6815TD/21P,125?
The absolute maximum input voltage for the LD6815TD/21P,125 is +6.0 V for 4 ms transients, per its limiting values table. For continuous operation, the recommended input range is 2.3 V to 5.5 V. Exceeding 5.5 V continuously risks exceeding the 800 mW total power dissipation limit and may trigger thermal shutdown - both specified in the LD6815TD/21P,125 datasheet.
Can the LD6815TD/21P,125 be used with ceramic output capacitors?
Yes, the LD6815TD/21P,125 is fully stable with 0.7–1.0 µF X7R ceramic capacitors (ESR 5–500 mΩ), as confirmed in Section 10.1 and Table 9 of the official datasheet. It does not require tantalum or aluminum electrolytic capacitors, simplifying design and improving reliability in portable applications where the LD6815TD/21P,125 is commonly deployed.
LD6815TD/21P,125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
LD6815TD/21P,125 FAQ
1.How can I place an order for LD6815TD/21P,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6815TD/21P,125 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LD6815TD/21P,125 reliable?
The price and inventory of LD6815TD/21P,125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6815TD/21P,125 is usually 5 days.
3.What payment methods are accepted for LD6815TD/21P,125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6815TD/21P,125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6815TD/21P,125?
LD6815TD/21P,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6815TD/21P,125 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LD6815TD/21P,125?
For technical support, including LD6815TD/21P,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6815TD/21P,125 requirements.
6.How does Aetrix verify that LD6815TD/21P,125 is sourced from the original manufacturer or authorized distributors?
All LD6815TD/21P,125 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LD6815TD/21P,125 meets industry standards.
7.What is the process for return or replacement of LD6815TD/21P,125?
All LD6815TD/21P,125 units undergo pre-shipment inspection (PSI). If there is an issue with LD6815TD/21P,125, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LD6815TD/21P,125 part is unused and in its original packaging.
Return procedure for LD6815TD/21P,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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