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NXP Semiconductors LD6815TD/15P,125
- Part No.:
- LD6815TD/15P,125
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD6815TD/15P,125.pdf
- Description:
- IC REG LINEAR 1.5V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,311
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Product details
Overview
LD6815TD/15P,125 from NXP Semiconductors is a fixed-output 1.5 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/15P,125 datasheet, LD6815TD/15P,125 pinout, LD6815TD/15P,125 application, or LD6815TD/15P,125 equivalent, key selection criteria include its 1.5 V fixed output, SOT753 package compatibility, enable-controlled auto-discharge behavior, and high PSRR performance under dynamic load conditions typical in mobile SoC power domains.
Technical Context
The LD6815TD/15P,125 integrates a PMOS pass transistor with internal compensation, enabling stable operation with only 1 µF ceramic output capacitance. Its enable input (active HIGH) controls both regulation and the dedicated pull-down switch that actively discharges the output during shutdown - a critical feature for fast system power sequencing.
This device implements overcurrent protection, thermal shutdown, and ESD robustness (6 kV HBM). Its 0.1 µA shutdown quiescent current and 150 µs startup time support battery-powered applications requiring rapid wake/sleep transitions without output voltage overshoot or undershoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±2% (TA = −40 °C to +85 °C); ensures precise core voltage for 1.5 V logic rails. |
| Max Output Current | 150 mA continuous; supports single-core microcontrollers or sensor subsystems. |
| Dropout Voltage | 250 mV at 150 mA; enables >95% efficiency at 1.75 V input, extending battery runtime. |
| PSRR | 75 dB at 1 kHz; suppresses switching noise from upstream DC-DC converters feeding noisy supply rails. |
| RMS Output Noise | 40 µV (10 Hz–100 kHz); minimizes jitter in clock generators and SNR degradation in ADCs. |
| Startup Time | 150 µs to 95% of VOUT; meets fast wake-up requirements in always-on sensor nodes. |
| Shutdown Current | 0.1 µA typical; reduces standby leakage in multi-rail systems with coordinated enable sequencing. |
| Enable Threshold | VIH = 1.1 V min; compatible with 1.8 V GPIOs without level-shifting. |
Pinout & Package
SOT753 (TSOP5) plastic surface-mount package, 2.9 × 1.5 × 1.0 mm, 5-pin lead frame with exposed pad not present. Compatible with standard reflow profiles per J-STD-020C MSL1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.3 V–5.5 V unregulated supply; requires ≥0.7 µF ceramic decoupling capacitor. |
| 2 GND | Power ground | Common reference for input, output, and enable; must connect directly to PCB ground plane. |
| 3 EN | Enable control | Active-HIGH digital input; drives internal pass transistor and pull-down switch simultaneously. |
| 4 n.c. | No connection | Internally unconnected; no external trace or solder required; avoid routing signals underneath. |
| 5 OUT | Regulated output | Delivers 1.5 V ±2%; connects to load and 1 µF ceramic output capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor actively discharges output to <5% VOUT in 300 µs, preventing floating states during sleep. |
| Ultra-low noise | 40 µV RMS output noise (10 Hz–100 kHz) enables clean power for RF front-ends and precision analog sensors. |
| High PSRR | 75 dB rejection at 1 kHz allows co-location with noisy DC-DC converters without additional filtering. |
| Low shutdown current | 0.1 µA quiescent draw in disabled mode extends shelf life and battery hold time in IoT endpoints. |
| ESD robustness | 6 kV Human Body Model rating eliminates need for external ESD protection on enable and output lines. |
| Stable with small capacitors | Guaranteed stability with 0.7–1.0 µF X7R ceramic output caps; reduces BOM count and board area vs. larger electrolytics. |
Applications
| Smartphone Core Power | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Powers 1.5 V I/O interface and memory controller in smartphone application processors during active and low-power modes. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 1.5 V rail with fast enable/disable timing synchronized to CPU power states. Use Value: Auto-discharge prevents back-powering of downstream circuits during suspend, eliminating unintended wake events and leakage paths. |
Use Scenario: Supplies bias voltage to CMOS image sensor analog front-end where noise and transient response directly impact image quality. IC Role / Device Role / Timing Role: Low-noise, high-PSRR post-regulator cleaning up switched-mode supply ripple before sensor analog chain. Use Value: 40 µV RMS noise and 75 dB PSRR preserve SNR and reduce fixed-pattern noise in low-light capture. |
| Tablet PC Audio Codec | Portable Media Player DAC |
|
Use Scenario: Provides clean 1.5 V supply to audio codec's reference voltage and bias circuitry in tablet PCs. IC Role / Device Role / Timing Role: Dedicated LDO isolating audio subsystem from noisy main SoC power domain during playback and recording. Use Value: Ultra-low noise floor prevents audible hiss; 150 µs startup ensures glitch-free audio resume after deep sleep. |
Use Scenario: Delivers stable 1.5 V to stereo DAC in portable media players, where battery voltage varies from 4.2 V down to 3.0 V. IC Role / Device Role / Timing Role: Input-voltage-tolerant LDO maintaining regulation across full Li-ion discharge curve with minimal dropout. Use Value: 250 mV dropout at 150 mA enables usable runtime down to 1.75 V input, maximizing battery capacity utilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6215B152MR-G | Same 1.5 V output, 150 mA, SOT-25 package; 70 dB PSRR (1 kHz), 30 µV noise; no auto-discharge. | Lacks pull-down switch; requires external discharge path for fast shutdown sequencing. | Preferred when board space permits discrete discharge resistor and PSRR margin >5 dB is acceptable. |
| Richtek RT9193-15GB | 1.5 V, 300 mA, SOT-25; 65 dB PSRR (1 kHz), 50 µV noise; 1 µA shutdown current; no auto-discharge. | Higher current capability but lower PSRR and higher noise; no integrated discharge path. | Chosen when future-proofing for higher load current is prioritized over noise/PSRR and external discharge is acceptable. |
Compared with LD6815TD/15P,125, the XC6215B152MR-G offers lower noise but sacrifices auto-discharge and PSRR; the RT9193-15GB trades PSRR and noise for higher current and slightly higher quiescent draw - neither provides the integrated discharge functionality critical for tightly sequenced mobile power architectures.
Availability
LD6815TD/15P,125 is available at Aetrix Electronics and suitable for smartphone core power, digital camera sensor bias, tablet PC audio codec, and portable media player DAC applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LD6815TD/15P,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 regulation in space-constrained portable electronics, emphasizing fast transient response, minimal external components, and robust enable-controlled sequencing.
FAQ
What is the output voltage tolerance of the LD6815TD/15P,125 over temperature?
The LD6815TD/15P,125 maintains ±2% output voltage accuracy over the full operating ambient temperature range of −40 °C to +85 °C. At room temperature (25 °C), the tolerance tightens to ±0.5%, ensuring reliable 1.5 V rail integrity for voltage-sensitive logic and analog blocks throughout the device's thermal envelope.
Does the LD6815TD/15P,125 require an input capacitor?
Yes, the LD6815TD/15P,125 requires a minimum 0.7 µF ceramic input capacitor (X7R dielectric recommended) placed close to the IN and GND pins. This stabilizes the input supply against source impedance and prevents oscillation during load transients, especially when fed from high-impedance sources like battery protection ICs or long PCB traces.
How does the auto-discharge function work in the LD6815TD/15P,125?
When the EN pin is driven LOW, the LD6815TD/15P,125 disables regulation and activates an internal 100 Ω pull-down transistor between OUT and GND. This discharges the output capacitor to <5% of nominal voltage within 300 µs, preventing residual voltage from interfering with downstream power sequencing or causing latch-up in powered-off circuitry.
Can the LD6815TD/15P,125 be used with a 1.0 µF output capacitor?
Yes, the LD6815TD/15P,125 is fully stable with a 1.0 µF X7R ceramic output capacitor, which is the recommended value for optimal transient response and PSRR. The device specifies a minimum of 0.7 µF and maximum effective ESR of 500 mΩ, making standard 0603/0805 X7R caps ideal without requiring tantalum or polymer alternatives.
What is the thermal resistance (Rth(j-a)) of the LD6815TD/15P,125 in standard layout?
The typical junction-to-ambient thermal resistance of the LD6815TD/15P,125 is 125 K/W under standard two-layer PCB conditions (25 °C ambient, solid copper connections to all pins). Layout optimization-such as using internal ground/power planes and multiple vias-can reduce this value, but 125 K/W is the design baseline for worst-case junction temperature calculation at 150 mA load.
LD6815TD/15P,125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- 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/15P,125 FAQ
1.How can I place an order for LD6815TD/15P,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6815TD/15P,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/15P,125 reliable?
The price and inventory of LD6815TD/15P,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/15P,125 is usually 5 days.
3.What payment methods are accepted for LD6815TD/15P,125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6815TD/15P,125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6815TD/15P,125?
LD6815TD/15P,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6815TD/15P,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/15P,125?
For technical support, including LD6815TD/15P,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6815TD/15P,125 requirements.
6.How does Aetrix verify that LD6815TD/15P,125 is sourced from the original manufacturer or authorized distributors?
All LD6815TD/15P,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/15P,125 meets industry standards.
7.What is the process for return or replacement of LD6815TD/15P,125?
All LD6815TD/15P,125 units undergo pre-shipment inspection (PSI). If there is an issue with LD6815TD/15P,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/15P,125 part is unused and in its original packaging.
Return procedure for LD6815TD/15P,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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