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NXP Semiconductors LD6815TD/25P,125
- Part No.:
- LD6815TD/25P,125
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD6815TD/25P,125.pdf
- Description:
- IC REG LINEAR 2.5V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:54,000
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Product details
Overview
LD6815TD/25P,125 from NXP Semiconductors is a fixed-output 2.5 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 enabled via integrated pull-down transistor. It operates from 2.3 V to 5.5 V input and delivers low-noise (40 µV RMS, 10 Hz–100 kHz) power for precision analog and RF circuitry in portable consumer devices.
For engineers reviewing the LD6815TD/25P,125 datasheet, LD6815TD/25P,125 pinout, LD6815TD/25P,125 application, or LD6815TD/25P,125 equivalent, key selection criteria include its 0.1 µA shutdown quiescent current, 150 µs startup time, TSOP5 (SOT753) package compatibility, and verified auto-discharge behavior-critical for battery-powered systems requiring rapid output discharge during disable.
Technical Context
The LD6815TD/25P,125 integrates a PMOS pass transistor with internal feedback loop compensation optimized for stability with 0.7–1.0 µF ceramic output capacitors. Its enable input (EN, active HIGH) controls both regulation and the dedicated pull-down switch that actively discharges the output node to <5% VO(nom) within 300 µs of disable.
Designed for high-PSRR noise suppression in sensitive signal chains, it maintains 75 dB rejection at 1 kHz while delivering 40 µV RMS output noise across 10 Hz–100 kHz-enabled by monolithic silicon construction and optimized internal biasing. Thermal resistance is specified at 125 K/W (junction-to-ambient, typical, two-layer PCB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.5 V ±2% (Tamb = −40 °C to +85 °C), enabling direct replacement of 2.5 V logic rails without external resistors. |
| Max output current | 150 mA continuous; supports peak loads up to 200 mA (short-term), sufficient for powering multiple low-power ICs on a single rail. |
| Dropout voltage | 250 mV at 150 mA load, allowing operation down to VIN = 2.75 V while maintaining regulated 2.5 V output-critical for Li-ion battery discharge profiles. |
| PSRR | 75 dB at 1 kHz, rejecting switching noise from upstream DC-DC converters and preserving signal integrity in audio/RF sections. |
| Output noise | 40 µV RMS (10 Hz–100 kHz), minimizing jitter in clock buffers and noise in ADC reference supplies. |
| Quiescent current | 0.1 µA in shutdown (VEN ≤ 0.4 V), reducing standby power loss in always-on subsystems like real-time clocks or sensors. |
| Startup time | 150 µs to 95% of 2.5 V (with 1 µF output cap), supporting fast wake-up sequences in mobile SoC power domains. |
| Shutdown discharge | Pull-down resistance ≈100 Ω enables <300 µs output discharge to 0.05 × VO(nom), preventing floating nodes and latch-up in multi-rail systems. |
Pinout & Package
SOT753 (TSOP5) plastic surface-mount package, 2.9 × 1.5 × 1.0 mm body size, 5-pin configuration with standard lead pitch (0.95 mm) and thermal pad-compatible footprint per Figure 16.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input supply | Accepts 2.3–5.5 V; requires ≥0.7 µF input capacitor for stability and transient response. |
| 2 GND | Power ground reference | Common return path for input, output, and enable; must connect to low-impedance ground plane. |
| 3 EN | Enable control input | Active-HIGH logic (VIH ≥ 1.1 V); drives internal regulator and pull-down switch simultaneously. |
| 4 n.c. | No connection | Internally unconnected; must remain floating-no external tie or routing permitted. |
| 5 OUT | Regulated output | Delivers 2.5 V ±2%; connects to load and 0.7–1.0 µF ceramic capacitor with ESR 5–500 mΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor ensures rapid, controlled output discharge (<300 µs) during disable-eliminates need for external bleeder resistors. |
| Ultra-low shutdown IQ | 0.1 µA quiescent current in disabled state preserves battery life in long-duration sleep modes (e.g., IoT sensor nodes). |
| High PSRR architecture | 75 dB rejection at 1 kHz achieved via optimized error amplifier gain and PMOS pass device-suppresses ripple from noisy switchers feeding the LDO. |
| ESD robustness | 6 kV HBM rating protects against handling damage during assembly and field operation in handheld environments. |
| Stable with small ceramics | Guaranteed stability with 0.7–1.0 µF X7R MLCC output capacitors-reduces BOM count and board area vs. larger tantalum solutions. |
Applications
| Smartphone Power Management | Digital Still Camera Sensor Supply |
|---|---|
Use Scenario: Providing clean 2.5 V bias to image signal processors (ISPs) and CMOS image sensors during burst capture mode. IC Role / Device Role / Timing Role: Low-noise post-regulator delivering stable voltage to analog front-end circuits with minimal supply-induced pixel noise. Use Value: 40 µV RMS output noise prevents fixed-pattern noise and banding artifacts; 150 mA capacity supports dual-sensor configurations. | Use Scenario: Powering high-speed ADCs and precision reference buffers in compact DSC modules with tight thermal constraints. IC Role / Device Role / Timing Role: Precision voltage source decoupling digital and analog domains to maintain ENOB and SNR specifications. Use Value: 75 dB PSRR suppresses noise from flash charging circuits and motor drivers sharing the same battery rail. |
| Tablet PC Audio Codec Rail | Mobile Internet Device RF Front-End |
Use Scenario: Supplying 2.5 V to stereo audio codecs during playback, where low THD+N is mandatory. IC Role / Device Role / Timing Role: Ultra-low-noise LDO isolating codec analog supply from noisy digital SoC domains. Use Value: 40 µV RMS noise directly translates to >100 dB SNR in 24-bit audio paths; 250 mV dropout enables use with partially discharged batteries. | Use Scenario: Biasing low-noise amplifiers (LNAs) and mixer stages in LTE/Wi-Fi front-ends where supply ripple degrades receiver sensitivity. IC Role / Device Role / Timing Role: High-PSRR local regulator filtering switching noise from system PMIC outputs. Use Value: 75 dB PSRR at 1 kHz rejects DC-DC ripple from adjacent 2.4 GHz/5 GHz RF bands, improving adjacent channel rejection by ≥3 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78025DRVR | Lower IQ (500 nA), same 2.5 V output, but only 150 mA max and no auto-discharge; PSRR = 65 dB @ 1 kHz. | Lacks integrated pull-down; requires external discharge circuit for fast shutdown-increasing component count and layout complexity. | Select when ultra-low standby power dominates over discharge speed and PSRR performance. |
| MCP1703T-2502E/MB | 2.5 V output, 250 mA rating, 60 dB PSRR @ 1 kHz, no auto-discharge, higher dropout (330 mV @ 250 mA). | Higher dropout limits usable input range; absence of discharge function risks residual voltage in multi-rail sequencing. | Choose when higher output current is required and PSRR/noise specs are relaxed relative to LD6815TD/25P,125. |
Compared with TPS78025DRVR and MCP1703T-2502E/MB, the LD6815TD/25P,125 uniquely combines 75 dB PSRR, 40 µV noise, 0.1 µA shutdown IQ, and integrated auto-discharge-making it optimal for space-constrained, battery-sensitive designs where rapid, reliable rail shutdown and ultra-clean power are co-required.
Availability
LD6815TD/25P,125 is available at Aetrix Electronics and suitable for smartphone power management, digital still camera sensor supply, tablet PC audio codec rails, and mobile internet device RF front-end applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LD6815TD/25P,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 belongs to NXP's high-performance analog power management portfolio, designed specifically for portable consumer electronics demanding ultra-low noise, high PSRR, and intelligent power sequencing-including auto-discharge for safe multi-rail system shutdown.
FAQ
What is the maximum input voltage rating for the LD6815TD/25P,125?
The LD6815TD/25P,125 has an absolute maximum input voltage (VIN) rating of +6.0 V for 4 ms transients, with recommended operating range from 2.3 V to 5.5 V. Exceeding 6.0 V-even briefly-may cause permanent damage per IEC 60134 limiting values. For sustained operation, VIN must remain within the 2.3–5.5 V window to ensure regulation, stability, and thermal safety of the LD6815TD/25P,125.
Does the LD6815TD/25P,125 require an external output capacitor, and what value is recommended?
Yes, the LD6815TD/25P,125 requires an external ceramic output capacitor for stability and transient response. The datasheet specifies a minimum capacitance of 0.7 µF and recommends 1.0 µF (X7R dielectric, ±30% tolerance) with ESR between 5 mΩ and 500 mΩ. Using less than 0.7 µF risks oscillation or poor load regulation; the LD6815TD/25P,125 is not stable without this external capacitor.
How does the auto-discharge function of the LD6815TD/25P,125 operate during shutdown?
When the EN pin is driven LOW (≤0.4 V), the LD6815TD/25P,125 disables regulation and activates an internal ~100 Ω pull-down transistor between OUT and GND. This discharges the output capacitor to <5% of 2.5 V (i.e., <0.125 V) within 300 µs, preventing floating nodes and ensuring safe, predictable power-down sequencing in multi-rail systems using the LD6815TD/25P,125.
What is the thermal resistance (Rth(j-a)) of the LD6815TD/25P,125, and how does PCB layout affect it?
The typical junction-to-ambient thermal resistance (Rth(j-a)) of the LD6815TD/25P,125 is 125 K/W under standard test conditions (two-layer PCB). Layout significantly impacts actual performance: connecting all pins-especially GND-to large copper areas, adding thermal vias beneath the package, and avoiding solder-mask over thermal pads can reduce effective Rth(j-a) by up to 30%, improving power handling and reliability of the LD6815TD/25P,125.
Is the LD6815TD/25P,125 compatible with lead-free reflow soldering processes?
Yes, the LD6815TD/25P,125 is qualified for lead-free reflow soldering per J-STD-020C. As a SOT753 package with thickness <1.6 mm and volume <350 mm³, it requires a peak temperature of 260 °C. Moisture sensitivity level (MSL) compliance must be observed-baking per JEDEC standards is required if exposed beyond floor life. The LD6815TD/25P,125's monolithic silicon construction ensures robustness through standard reflow profiles.
LD6815TD/25P,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):
- 2.5V
- 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/25P,125 FAQ
1.How can I place an order for LD6815TD/25P,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6815TD/25P,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/25P,125 reliable?
The price and inventory of LD6815TD/25P,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/25P,125 is usually 5 days.
3.What payment methods are accepted for LD6815TD/25P,125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6815TD/25P,125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6815TD/25P,125?
LD6815TD/25P,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6815TD/25P,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/25P,125?
For technical support, including LD6815TD/25P,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6815TD/25P,125 requirements.
6.How does Aetrix verify that LD6815TD/25P,125 is sourced from the original manufacturer or authorized distributors?
All LD6815TD/25P,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/25P,125 meets industry standards.
7.What is the process for return or replacement of LD6815TD/25P,125?
All LD6815TD/25P,125 units undergo pre-shipment inspection (PSI). If there is an issue with LD6815TD/25P,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/25P,125 part is unused and in its original packaging.
Return procedure for LD6815TD/25P,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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