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NXP Semiconductors LD6816CX4/C25P,315
- Part No.:
- LD6816CX4/C25P,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-UFBGA, WLCSP
- Datasheet:
-
LD6816CX4/C25P,315.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:27,000
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Product details
Overview
LD6816CX4/C25P from NXP Semiconductors is a 2.5 V fixed-output, 150 mA ultra-low-dropout linear regulator in WLCSP4 package, featuring 45 mV dropout at full load, 30 µVRMS output noise (10 Hz–100 kHz), and auto-discharge functionality via integrated pull-down transistor. It operates from 2.3 V to 5.5 V input and delivers stable power to noise-sensitive analog/digital cores in space-constrained mobile devices.
For engineers reviewing the LD6816CX4/C25P datasheet, LD6816CX4/C25P pinout, LD6816CX4/C25P application, or LD6816CX4/C25P equivalent, this page provides verified specifications, validated pin functions, confirmed use cases in portable electronics, and two technically documented alternative parts with explicit functional and application-level distinctions.
Technical Context
The LD6816CX4/C25P implements a PMOS pass transistor architecture enabling ultra-low dropout (45 mV @ 150 mA) and fast start-up (<150 µs). Its enable input (active HIGH) controls both regulation and the integrated 100 Ω pull-down switch that actively discharges the output during disable-critical for system-level power sequencing in battery-powered applications.
It integrates over-temperature shutdown (160 °C trigger, 20 K hysteresis), current limiting (600 mA short-circuit), and 55 dB PSRR at 1 kHz. The 0.76 mm × 0.76 mm × 0.47 mm WLCSP4 package uses 0.4 mm pitch solder bumps and supports reflow-only assembly per J-STD-020C MSL-1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.5 V ±2 % over −40 °C to +85 °C ambient; enables direct replacement of 2.5 V logic rails without external feedback. |
| Dropout voltage | 45 mV typical at 150 mA load; allows operation with VIN as low as 2.545 V, maximizing battery runtime in single-cell Li-ion systems. |
| PSRR | 55 dB at 1 kHz; suppresses switching noise from upstream DC-DC converters feeding sensitive RF or ADC circuitry. |
| Output noise | 30 µVRMS (10 Hz–100 kHz); meets low-noise requirements for precision analog sensors and high-SNR audio codecs. |
| Quiescent current | 0.1 µA typical in shutdown (VEN ≤ 0.4 V); minimizes leakage current in always-on subsystems like real-time clocks. |
| Enable threshold | VIH = 1.1 V min, VIL = 0.4 V max; compatible with 1.8 V and 3.3 V GPIOs without level-shifting. |
| Pull-down resistance | 100 Ω typical; ensures rapid discharge of 1 µF output capacitance in <300 µs, preventing floating states during power-down. |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP4), 0.76 mm × 0.76 mm × 0.47 mm, 0.4 mm bump pitch, Pb-free/RoHS/halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (GND) | Supply ground reference | Primary thermal and electrical return path; must connect to large copper pour for thermal dissipation and noise control. |
| A2 (EN) | Active-HIGH enable input | Drives internal regulator and pull-down transistor; 0.1 µA shutdown current achieved when held ≤0.4 V. |
| B1 (OUT) | Regulated output voltage | Delivers 2.5 V to load; includes integrated 100 Ω pull-down to GND when EN = LOW for auto-discharge. |
| B2 (IN) | Input supply voltage | Accepts 2.3–5.5 V; requires ≥0.7 µF X7R ceramic capacitor with 5–500 mΩ ESR for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 45 mV at 150 mA enables >98 % efficiency at 2.5 V output from 2.6 V input-critical for extending Li-ion battery life. |
| Auto-discharge function | Integrated 100 Ω pull-down transistor on OUT pin ensures controlled discharge during disable, eliminating need for external bleed resistors. |
| Low-noise regulation | 30 µVRMS noise floor supports clean power delivery to RF transceivers, high-resolution ADCs, and PLLs without additional filtering. |
| Robust protection | Thermal shutdown (160 °C), current limit (600 mA), and 10 kV HBM ESD rating ensure reliability in handheld and wearable environments. |
| Miniaturized packaging | 0.76 mm × 0.76 mm WLCSP4 footprint saves >70 % board area vs. SOT-23-5, enabling integration into ultra-thin smartphones and wearables. |
Applications
| Smartphone Application Processor Core | Digital Still Camera Image Sensor |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series CPU cores requiring tightly regulated 2.5 V with fast transient response during burst-mode operation. IC Role / Device Role / Timing Role: Primary LDO supplying core voltage; enables dynamic voltage scaling and rapid enable/disable during sleep/wake cycles. Use Value: 45 mV dropout preserves headroom for battery sag; <150 µs start-up time meets Android Fast Boot timing constraints. |
Use Scenario: Supplying CMOS image sensor analog front-end (AFE) where supply noise directly impacts SNR and dark current. IC Role / Device Role / Timing Role: Low-noise bias rail generator; decouples sensor from noisy digital domain supplies. Use Value: 30 µVRMS noise and 55 dB PSRR prevent switching artifacts from appearing in captured images. |
| Portable Media Player Audio Codec | Personal Navigation Device GPS Front-End |
|
Use Scenario: Delivering clean 2.5 V to stereo audio DAC/ADC ICs in battery-operated MP3 players and Bluetooth headsets. IC Role / Device Role / Timing Role: Dedicated low-noise analog supply; isolated from digital switching noise by PSRR and layout separation. Use Value: Meets THD+N < −100 dB requirements; eliminates audible hiss caused by regulator noise coupling into audio paths. |
Use Scenario: Powering GPS RF front-end LNA and downconverter stages in handheld navigation units operating under weak-signal conditions. IC Role / Device Role / Timing Role: Ultra-stable local oscillator and mixer bias supply; rejects noise from baseband processor and display drivers. Use Value: 55 dB PSRR at 1 kHz prevents LO phase noise degradation, maintaining GPS acquisition sensitivity below −155 dBm. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0525PDBVR | 2.5 V, 200 mA, 170 mV dropout @ 200 mA, SOT-23-5 package (2.9 mm × 1.6 mm) | Larger footprint; no auto-discharge; higher quiescent current (2.5 µA typical in shutdown) | Select when board space permits larger package and auto-discharge is not required for system sequencing. |
| MCP1700T-2502E/MB | 2.5 V, 250 mA, 175 mV dropout @ 250 mA, SOT-23-3 package; no enable pin or auto-discharge | Fixed-on operation only; lacks EN control and output discharge capability | Select for cost-sensitive, always-on applications where enable control and fast discharge are unnecessary. |
Compared with TPS7A0525PDBVR and MCP1700T-2502E/MB, the LD6816CX4/C25P uniquely combines ultra-low dropout (45 mV), integrated auto-discharge, and sub-1 mm² WLCSP4 packaging-making it optimal for miniaturized, battery-efficient portable systems requiring precise power sequencing and noise immunity.
Availability
LD6816CX4/C25P is available at Aetrix Electronics and suitable for smartphone application processors, digital camera image sensors, portable media player audio codecs, and personal navigation device GPS front-ends requiring stable component supply with guaranteed long-term availability.
Supply support for LD6816CX4/C25P 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 specializing in secure connectivity solutions for automotive, industrial, and consumer electronics, with leadership in power management and RF technologies.
The LD6816 series was designed specifically for ultra-miniaturized, battery-powered portable devices demanding ultra-low dropout, low noise, and active output discharge-targeting next-generation smartphones, wearables, and IoT edge sensors.
FAQ
What is the nominal output voltage and tolerance of the LD6816CX4/C25P?
The LD6816CX4/C25P provides a fixed 2.5 V output with ±2 % tolerance over −40 °C to +85 °C ambient temperature and 1 mA to 150 mA load current. This accuracy is maintained across input voltages from 2.3 V to 5.5 V and ensures compatibility with 2.5 V logic families without external trimming or feedback components.
Does the LD6816CX4/C25P include an auto-discharge function, and how does it operate?
Yes, the LD6816CX4/C25P includes an integrated auto-discharge function. When the EN pin is driven LOW, an internal 100 Ω pull-down transistor connects the OUT pin to GND, discharging external capacitors in under 300 µs. This eliminates floating outputs and simplifies power sequencing in multi-rail systems-no external resistor is needed.
What is the minimum recommended output capacitor for stable operation of the LD6816CX4/C25P?
The LD6816CX4/C25P requires a minimum 0.7 µF X7R ceramic capacitor at the OUT pin, with recommended value of 1.0 µF and ESR between 5 mΩ and 500 mΩ. Using a 1.0 µF capacitor ensures stability across temperature and load, while also optimizing shutdown time and transient response performance.
How does the LD6816CX4/C25P compare to standard LDOs in terms of dropout voltage and efficiency?
The LD6816CX4/C25P achieves 45 mV typical dropout at 150 mA-less than one-third the dropout of conventional LDOs. At 2.5 V output, this allows operation from as low as 2.545 V input, increasing usable battery capacity by up to 12 % in single-cell Li-ion systems compared to LDOs with 150+ mV dropout.
Is the LD6816CX4/C25P RoHS-compliant and suitable for lead-free reflow assembly?
Yes, the LD6816CX4/C25P is Pb-free, RoHS-compliant, halogen- and antimony-free (dark green compliant), and qualified for lead-free reflow soldering per J-STD-020C. Its WLCSP4 package has a peak reflow temperature rating of 260 °C (MSL-1), supporting standard Pb-free manufacturing processes without moisture baking.
LD6816CX4/C25P,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- LD6816
- Package/Case:
- 4-UFBGA, WLCSP
- Packaging:
- Bulk
- Product Status:
- Active
- 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):
- 0.075V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 250 µA
- PSRR:
- 55dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Transient Voltage
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-WLCSP (0.76x0.76)
LD6816CX4/C25P,315 FAQ
1.How can I place an order for LD6816CX4/C25P,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/C25P,315 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 LD6816CX4/C25P,315 reliable?
The price and inventory of LD6816CX4/C25P,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6816CX4/C25P,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/C25P,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/C25P,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/C25P,315?
LD6816CX4/C25P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/C25P,315 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 LD6816CX4/C25P,315?
For technical support, including LD6816CX4/C25P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/C25P,315 requirements.
6.How does Aetrix verify that LD6816CX4/C25P,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/C25P,315 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 LD6816CX4/C25P,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/C25P,315?
All LD6816CX4/C25P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/C25P,315, 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 LD6816CX4/C25P,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/C25P,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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