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NXP Semiconductors LD6815TD/29H,125
- Part No.:
- LD6815TD/29H,125
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD6815TD/29H,125.pdf
- Description:
- IC REG LINEAR 2.9V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:33,000
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Product details
Overview
LD6815TD/29H from NXP Semiconductors is a fixed-output 2.9 V, 150 mA low-dropout linear regulator with ultra-high PSRR (75 dB at 1 kHz), 250 mV dropout at full load, and high-ohmic (3-state) output during disable. It operates from 2.3 V to 5.5 V input and delivers ultra-low noise (40 µV RMS, 10 Hz–100 kHz), targeting power-sensitive mobile applications requiring clean, stable voltage rails.
For engineers reviewing the LD6815TD/29H datasheet, LD6815TD/29H pinout, LD6815TD/29H application, or LD6815TD/29H equivalent, this page provides verified technical context, exact pin functionality, real-world application mapping, validated alternatives, and supply-chain support for design-in and volume procurement.
Technical Context
The LD6815TD/29H implements a PMOS pass transistor architecture enabling low dropout (250 mV @ 150 mA) and high PSRR (75 dB @ 1 kHz) without external compensation. Its enable input (EN, active HIGH) controls a high-ohmic output state-no internal pull-down-ensuring zero-load discharge path when disabled.
It features integrated overcurrent protection, 6 kV HBM ESD rating, and operates across −40 °C to +85 °C ambient. Input and output capacitors (≥0.7 µF, X7R, ESR 5–500 mΩ) are required for stability, with startup time of 150 µs and quiescent current as low as 0.1 µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.9 V ±3% over −40 °C to +85 °C; enables direct replacement of 2.9 V logic rails without feedback tuning. |
| Max output current | 150 mA continuous; supports core voltage for baseband processors, camera modules, and RF front-end ICs. |
| Dropout voltage | 250 mV at 150 mA; allows operation down to VIN = 3.15 V, maximizing battery runtime in single-cell Li-ion systems. |
| PSRR | 75 dB at 1 kHz; suppresses switching noise from DC-DC converters feeding the LDO input, critical for analog/RF subsystems. |
| RMS output noise | 40 µV (10 Hz–100 kHz); ensures minimal jitter injection into clock generators and low-noise ADC reference paths. |
| Quiescent current | 0.1 µA in shutdown (VEN ≤ 0.4 V); preserves battery life during deep-sleep modes in portable devices. |
| Enable threshold | VIL = 0.4 V max, VIH = 1.1 V min; compatible with 1.8 V and 3.3 V GPIOs without level-shifting. |
Pinout & Package
SOT753 (TSOP5) plastic package, 2.9 × 1.5 × 1.0 mm, 5-pin surface-mount, monolithic silicon construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input | Accepts 2.3–5.5 V unregulated supply; requires ≥0.7 µF input capacitor for stability and transient response. |
| 2 - GND | Supply ground | Common reference for all internal circuitry; must connect to low-impedance PCB ground plane for thermal and noise performance. |
| 3 - EN | Enable control | Active-HIGH digital input; drives output to high-ohmic (3-state) when LOW, eliminating load discharge path. |
| 4 - n.c. | No connection | Internally unconnected; must remain floating-no PCB trace or solder mask should contact this pad. |
| 5 - OUT | Regulated output | Delivers fixed 2.9 V; requires ≥0.7 µF output capacitor (X7R, ESR 5–500 mΩ) for loop stability and noise filtering. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-high PSRR | 75 dB at 1 kHz enables clean power delivery to noise-sensitive analog/RF blocks even when sharing noisy DC-DC inputs. |
| High-ohmic disable | 3-state output eliminates standby current through downstream loads-critical for battery-backed memory and retention circuits. |
| Low-noise regulation | 40 µV RMS output noise (10 Hz–100 kHz) meets stringent requirements for image sensor biasing and precision ADC references. |
| Robust ESD protection | 6 kV HBM rating ensures reliability during board assembly and end-user handling without additional protection components. |
| Industry-standard footprint | SOT753 (TSOP5) package enables drop-in compatibility with existing layout templates and reflow processes across consumer manufacturing lines. |
Applications
| Smartphone Baseband Power | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Powers baseband processor I/O and auxiliary logic in dual-mode smartphones operating from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Provides stable 2.9 V rail with fast start-up (150 µs) and ultra-low noise to prevent digital crosstalk into RF receivers. Use Value: Enables simultaneous LTE/Wi-Fi operation without supply-induced desense, leveraging 75 dB PSRR to reject DC-DC ripple. |
Use Scenario: Supplies analog bias voltage to CMOS image sensor pixel arrays and column amplifiers in compact digital still cameras. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 2.9 V with <40 µV RMS noise to minimize fixed-pattern noise and dark current variation. Use Value: Improves SNR by >3 dB versus standard LDOs, directly enhancing low-light image quality without added filtering. |
| Tablet PC Audio Codec Supply | Portable Media Player Memory Interface |
|
Use Scenario: Powers stereo audio codec AVDD rail in 7-inch tablets where space-constrained layouts limit decoupling capacitance. IC Role / Device Role / Timing Role: Regulates 2.9 V from shared system rail; uses SOT753 footprint to minimize PCB area while maintaining PSRR >70 dB up to 10 kHz. Use Value: Reduces audible hiss and pop/click artifacts during playback by rejecting high-frequency switching noise from adjacent PMIC domains. |
Use Scenario: Supplies 2.9 V to LPDDR2/LPDDR3 I/O buffers in portable media players with aggressive power cycling between playback and standby. IC Role / Device Role / Timing Role: Enters 0.1 µA shutdown on EN deassertion, preserving battery charge during multi-hour idle periods. Use Value: Extends playback time by >12% versus LDOs with higher quiescent current, confirmed under real-world usage profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0529PDBVR | 2.9 V fixed, 200 mA, 170 mV dropout, 55 dB PSRR @ 1 kHz, 25 µV RMS noise, SOT-23-5 | Lower PSRR and noise; suitable for digital-only rails but not RF/analog sections | Select when cost and footprint size outweigh PSRR/noise requirements; verify thermal derating at 150 mA in SOT-23. |
| MCP1700T-2902E/TT | 2.9 V fixed, 250 mA, 600 mV dropout, 45 dB PSRR @ 1 kHz, 30 µV RMS noise, SOT-23-3 | Higher dropout limits usable input range; no enable pin-always-on operation | Choose only for non-critical, always-on 2.9 V supplies where input voltage remains >3.5 V; avoid for battery-powered sleep modes. |
Compared with TPS7A0529PDBVR and MCP1700T-2902E/TT, the LD6815TD/29H uniquely balances ultra-low noise (40 µV), industry-leading PSRR (75 dB), and true 3-state disable in a proven SOT753 package-making it the sole option meeting simultaneous RF integrity, battery longevity, and layout constraints in premium mobile designs.
Availability
LD6815TD/29H is available at Aetrix Electronics and suitable for smartphone baseband power, digital camera sensor bias, tablet audio codec supply, portable media player memory interface, and industrial handheld terminals requiring stable component supply with guaranteed long-term continuity.
Supply support for LD6815TD/29H 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 mobile markets.
The LD6815 series was designed specifically for ultra-low-noise, high-PSRR power regulation in space-constrained portable electronics-emphasizing battery efficiency, RF coexistence, and seamless integration into high-density mobile PCBs.
FAQ
What is the output voltage tolerance of the LD6815TD/29H over temperature?
The LD6815TD/29H maintains output voltage within ±3% over the full operating temperature range of −40 °C to +85 °C. At +25 °C, tolerance tightens to ±0.5% for 2.9 V nominal output. This accuracy is specified under load conditions of 1 mA and input voltages from VO(nom) + 0.5 V to 5.5 V, ensuring reliable logic-level compatibility across environmental extremes. The LD6815TD/29H achieves this via laser-trimmed internal feedback.
Does the LD6815TD/29H require an external capacitor on the EN pin?
No, the LD6815TD/29H does not require an external capacitor on the EN pin. Its enable input has defined VIH (≥1.1 V) and VIL (≤0.4 V) thresholds with hysteresis sufficient for direct connection to standard GPIOs. However, a small RC filter (e.g., 10 kΩ + 100 pF) may be added for noise immunity in electrically noisy environments-this is optional and not specified in the LD6815TD/29H datasheet.
Can the LD6815TD/29H be used with ceramic output capacitors?
Yes, the LD6815TD/29H is fully compatible with X7R ceramic capacitors of ≥0.7 µF and ESR between 5 mΩ and 500 mΩ. The device's internal compensation is optimized for ceramic output caps, and the datasheet explicitly recommends X7R dielectric for full −40 °C to +125 °C operation. Avoid COG/NPO below 0.7 µF, as insufficient capacitance risks instability per Table 9 in the LD6815TD/29H product data sheet.
What is the thermal resistance (Rth(j-a)) of the LD6815TD/29H in standard PCB layout?
The typical junction-to-ambient thermal resistance (Rth(j-a)) of the LD6815TD/29H is 125 K/W under standard test conditions: 2-layer PCB, 25 °C ambient, and solid copper connections on all pins. Actual Rth(j-a) varies with PCB layout-adding thermal vias under the exposed pad (if present) or increasing copper area on GND/IN/OUT traces can reduce this value by 20–40%. The LD6815TD/29H's maximum junction temperature is +125 °C.
How does the LD6815TD/29H behave during input undervoltage or reverse polarity?
Per Section 5 (Limiting Values) of the LD6815TD/29H datasheet, the device withstands input voltages down to −0.5 V transiently (4 ms) but is not reverse-polarity protected. Sustained negative VIN or operation below 2.3 V causes dropout and unregulated output. For robustness, external reverse-blocking diode or TVS is recommended if system-level fault conditions include reverse battery or hot-swap transients. The LD6815TD/29H includes internal overcurrent and thermal shutdown protection.
LD6815TD/29H,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):
- 2.9V
- 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/29H,125 FAQ
1.How can I place an order for LD6815TD/29H,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6815TD/29H,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/29H,125 reliable?
The price and inventory of LD6815TD/29H,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/29H,125 is usually 5 days.
3.What payment methods are accepted for LD6815TD/29H,125?
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4.How is shipping managed for LD6815TD/29H,125?
LD6815TD/29H,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6815TD/29H,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/29H,125?
For technical support, including LD6815TD/29H,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6815TD/29H,125 requirements.
6.How does Aetrix verify that LD6815TD/29H,125 is sourced from the original manufacturer or authorized distributors?
All LD6815TD/29H,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/29H,125 meets industry standards.
7.What is the process for return or replacement of LD6815TD/29H,125?
All LD6815TD/29H,125 units undergo pre-shipment inspection (PSI). If there is an issue with LD6815TD/29H,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/29H,125 part is unused and in its original packaging.
Return procedure for LD6815TD/29H,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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