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NXP Semiconductors LD6816CX4/25H,315
- Part No.:
- LD6816CX4/25H,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
LD6816CX4/25H,315.pdf
- Description:
- IC REG LINEAR 2.5V 150MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
LD6816CX4/25H 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 55 dB PSRR at 1 kHz-designed for power-sensitive mobile interfaces in smartphones and portable media players.
For engineers reviewing the LD6816CX4/25H datasheet, LD6816CX4/25H pinout, LD6816CX4/25H application, or LD6816CX4/25H equivalent, this page delivers verified electrical specs, thermal behavior, enable timing, high-ohmic shutdown state, and WLCSP4 layout guidance-critical for miniaturized battery-powered designs requiring stable low-noise biasing.
Technical Context
The LD6816CX4/25H implements a PMOS pass transistor architecture enabling ultra-low dropout (45 mV @ 150 mA) and fast start-up (<150 µs). Its internal voltage reference and error amplifier maintain ±0.5% output accuracy over temperature and load, with built-in over-temperature and current-limit protection.
Unlike P-variant devices, the /25H suffix denotes high-ohmic (3-state) output during disable-no pull-down transistor-making it suitable for systems where output isolation is required. ESD robustness reaches ±10 kV HBM, and operation is guaranteed from −40 °C to +85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±0.5% at 25 °C; ±3% over −40 °C to +85 °C - ensures stable core/bias rail for precision analog or low-voltage logic. |
| Dropout Voltage | 45 mV typical at 150 mA - enables regulation down to VIN = 2.545 V, maximizing battery runtime in single-cell Li-ion or Li-poly systems. |
| PSRR | 55 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters, critical for ADC reference or RF bias supplies. |
| Output Noise | 30 µVRMS (10 Hz–100 kHz) - low enough for noise-sensitive analog circuits like audio codecs or sensor front-ends. |
| Quiescent Current | 0.1 µA typical in shutdown (VEN ≤ 0.4 V) - minimizes leakage in always-on subsystems such as real-time clocks or wake-up controllers. |
| 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. |
| Thermal Resistance | Rth(j-a) = 130 K/W - requires PCB copper pour under die for reliable 150 mA operation at 85 °C ambient. |
Pinout & Package
LD6816CX4/25H uses a 0.4 mm pitch Wafer-Level Chip-Scale Package (WLCSP4), measuring 0.76 mm × 0.76 mm × 0.47 mm, with four solder bumps in a 2×2 array and laser-marked index area at bump A1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (B2) | Input voltage supply | Accepts 2.3 V–5.5 V; must be decoupled with ≥1 µF X7R ceramic capacitor near the pin to ensure stability and transient response. |
| OUT (B1) | Regulated output | Delivers fixed 2.5 V; high-ohmic (3-state) when disabled-no auto-discharge-requires external pull-down if active-low reset coordination is needed. |
| GND (A1) | Ground reference | Primary return path; must connect directly to large PCB ground plane via multiple vias to minimize impedance and thermal resistance. |
| EN (A2) | Enable control input | Active-HIGH logic; drives regulator ON when ≥1.1 V; pulls output into high-Z state when <0.4 V; no internal pull-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 45 mV @ 150 mA enables operation with minimal headroom-ideal for extending battery life in single-cell applications. |
| Low-noise regulation | 30 µVRMS noise supports clean power for RF transceivers, precision ADCs, and audio amplifiers without additional filtering. |
| Fast enable response | <150 µs start-up time allows rapid power sequencing in multi-rail systems and low-power wake-up scenarios. |
| High-ohmic disable mode | True 3-state output isolates downstream circuitry during sleep-prevents backfeeding and unintended biasing of powered-off sections. |
| Robust thermal protection | 160 °C shutdown with 20 K hysteresis prevents latch-up and enables safe recovery after overload or poor heatsinking. |
Applications
| Smartphone Core Logic Supply | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Powering ARM Cortex-M core or FPGA configuration logic from a shared 3.3 V rail in space-constrained smartphone mainboard. IC Role / Device Role / Timing Role: Low-noise, fast-response LDO providing isolated 2.5 V domain with precise voltage tolerance and zero backfeed during deep-sleep states. Use Value: Enables >99% system uptime with <150 µs wake latency and eliminates noise coupling into sensitive digital logic paths. |
Use Scenario: Supplying image sensor analog front-end (AFE) and column ADC in compact digital still cameras. IC Role / Device Role / Timing Role: Stable 2.5 V bias source with ultra-low RMS noise and high PSRR to preserve dynamic range and SNR in low-light capture. Use Value: Reduces need for external RC filtering, saving board area while maintaining >72 dB SNR performance across operating temperature. |
| Portable Media Player Audio Codec | GPS/GLONASS Front-End Reference |
|
Use Scenario: Delivering clean 2.5 V reference to stereo DAC/ADC in battery-powered media players with aggressive size targets. IC Role / Device Role / Timing Role: Ultra-low-noise LDO with 30 µVRMS output and 55 dB PSRR at 1 kHz, placed adjacent to audio ICs on dense HDI substrate. Use Value: Achieves THD+N < −95 dB without ferrite beads or LC filters, simplifying layout and reducing BOM cost. |
Use Scenario: Providing regulated 2.5 V to GNSS RF front-end LNA and mixer stages in personal navigation devices. IC Role / Device Role / Timing Role: High-PSRR, low-dropout regulator rejecting switching noise from PMU DC-DC converters while maintaining tight voltage accuracy. Use Value: Improves carrier-to-noise ratio (C/N₀) by >2 dB in urban canyon environments by minimizing supply-induced phase noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P252MR | 2.5 V fixed, 150 mA, SOT-25 package (2.9 mm × 2.8 mm); dropout 160 mV @ 100 mA; PSRR 40 dB @ 1 kHz; no enable pin. | Larger footprint, no enable control, higher dropout-less suitable for ultra-miniaturized or sequenced power systems. | Select when board space permits larger package and enable functionality is unnecessary; verify thermal derating above 85 °C. |
| Richtek RT9013-25PB | 2.5 V fixed, 300 mA, DFN-6 (1.5 mm × 1.5 mm); dropout 250 mV @ 300 mA; PSRR 60 dB @ 1 kHz; 1 µA quiescent current in shutdown. | Higher current capability but larger dropout and different pinout; includes active-low enable and thermal foldback. | Prefer for higher-load applications (>150 mA) where 250 mV dropout is acceptable and thermal foldback is desired over hard shutdown. |
Compared with XC6206P252MR and RT9013-25PB, LD6816CX4/25H offers the smallest form factor (0.76 mm²), lowest dropout (45 mV), and true high-Z disable-making it optimal for ultra-thin mobile designs demanding minimal voltage overhead and strict output isolation.
Availability
LD6816CX4/25H is available at Aetrix Electronics and suitable for smartphone power management, portable media player audio subsystems, and GPS front-end biasing requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LD6816CX4/25H 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 LD6816 series was designed specifically for ultra-miniaturized portable electronics-delivering ultra-low dropout, low noise, and high PSRR in wafer-level chip-scale packaging to meet stringent size and power-efficiency requirements of modern smartphones and wearables.
FAQ
What is the maximum input voltage rating for LD6816CX4/25H?
The absolute maximum input voltage for LD6816CX4/25H is +6.0 V for transient conditions up to 4 ms. For continuous operation, the recommended input range is 2.3 V to 5.5 V. Exceeding 6.0 V-even briefly-may cause permanent damage due to junction breakdown. Always include input transient suppression if used in noisy or hot-swap environments.
Does LD6816CX4/25H support automatic output discharge during shutdown?
No, LD6816CX4/25H does not provide auto-discharge. The "H" suffix explicitly indicates high-ohmic (3-state) output during disable-meaning the OUT pin floats with no internal pull-down. To actively discharge downstream capacitance, an external resistor or dedicated discharge FET must be added. In contrast, /25P variants integrate a 100 Ω pull-down switch.
What is the minimum required output capacitor for stable operation of LD6816CX4/25H?
LD6816CX4/25H 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. Capacitor tolerance must be ±30% or better across −40 °C to +125 °C. Using smaller or higher-ESR capacitors risks oscillation or degraded load transient response.
How does the thermal performance of LD6816CX4/25H depend on PCB layout?
LD6816CX4/25H has a typical Rth(j-a) of 130 K/W, but this value assumes optimal PCB layout: solid copper connections from all four bumps to large ground/power planes, with multiple thermal vias under the die. Without adequate copper area and vias, junction temperature can exceed 125 °C even at 100 mA, triggering thermal shutdown.
Is LD6816CX4/25H RoHS-compliant and halogen-free?
Yes, LD6816CX4/25H is fully RoHS-compliant, lead-free, and meets NXP's "dark green" standard-free of halogen and antimony compounds. It conforms to JEDEC J-STD-020 moisture sensitivity level (MSL) 1, allowing unlimited floor life at ≤30 °C/60% RH, and is qualified per NX1-00023 for consumer applications.
LD6816CX4/25H,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 4-XFBGA, WLCSP
- 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):
- 0.075V @ 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)
LD6816CX4/25H,315 FAQ
1.How can I place an order for LD6816CX4/25H,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/25H,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 LD6816CX4/25H,315 reliable?
The price and inventory of LD6816CX4/25H,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6816CX4/25H,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/25H,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/25H,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/25H,315?
LD6816CX4/25H,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/25H,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 LD6816CX4/25H,315?
For technical support, including LD6816CX4/25H,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/25H,315 requirements.
6.How does Aetrix verify that LD6816CX4/25H,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/25H,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 LD6816CX4/25H,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/25H,315?
All LD6816CX4/25H,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/25H,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 LD6816CX4/25H,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/25H,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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