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NXP Semiconductors LD6816CX4/C18P,315
- Part No.:
- LD6816CX4/C18P,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-UFBGA, WLCSP
- Datasheet:
-
LD6816CX4/C18P,315.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:72,000
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Product details
Overview
LD6816CX4/C18P,315 from NXP Semiconductors is a 1.8 V fixed-output, 150 mA ultra-low-dropout linear regulator in a 0.4 mm pitch WLCSP4 package (0.76 × 0.76 × 0.47 mm), 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 powers low-voltage analog/digital interfaces in space-constrained portable electronics.
For engineers reviewing the LD6816CX4/C18P,315 datasheet, LD6816CX4/C18P,315 pinout, LD6816CX4/C18P,315 application, or LD6816CX4/C18P,315 equivalent, key selection criteria include its 1.8 V output accuracy (±0.5% at +25°C), 55 dB PSRR at 1 kHz, <150 µs startup time, and WLCSP4 thermal performance (Rth(j-a) = 130 K/W) for high-density mobile PCB layouts.
Technical Context
The LD6816CX4/C18P,315 implements a PMOS pass transistor architecture enabling ultra-low dropout (45 mV @ 150 mA) and stable operation with only 1.0 µF ceramic output capacitance. Its enable input (EN) accepts active-HIGH logic (VIH ≥ 1.1 V) and drives internal circuitry to achieve fast turn-on (<150 µs) and controlled shutdown (tsd = 300 µs) with 100 Ω pull-down resistance for rapid output discharge.
Internally, it integrates over-temperature shutdown (Tsd = 160°C, 20 K hysteresis), current limiting (Isc = 600 mA), and ESD protection (10 kV HBM). The device operates across −40°C to +85°C ambient and supports input voltages from 2.3 V to 5.5 V while maintaining ±3% output voltage tolerance over temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±0.5% (at +25°C, 1 mA load); ±3% over −40°C to +85°C ensures stable core supply for 1.8 V I/O domains |
| Dropout Voltage | 45 mV typical at 150 mA load - enables regulation from 1.845 V input, critical for battery-powered systems near end-of-life |
| PSRR | 55 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input |
| Output Noise | 30 µVRMS (10 Hz–100 kHz) - low enough for noise-sensitive analog circuits like ADC references or RF bias rails |
| Quiescent Current | 0.1 µA typical in shutdown (VEN ≤ 0.4 V) - minimizes battery drain in always-on standby modes |
| Enable Threshold | VIL ≤ 0.4 V / VIH ≥ 1.1 V - compatible with 1.8 V logic families without level-shifting |
| Thermal Resistance | Rth(j-a) = 130 K/W - requires solid copper pour under package for reliable 150 mA continuous operation at +85°C ambient |
Pinout & Package
LD6816CX4/C18P,315 uses a 4-bump Wafer-Level Chip-Scale Package (WLCSP4) with 0.4 mm pitch and footprint 0.76 mm × 0.76 mm. The package includes backside coating for enhanced mechanical robustness and moisture resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (A1) | Supply ground reference | Primary return path for load current and internal bias; must connect to large copper area for thermal and noise control |
| EN (A2) | Active-HIGH enable input | Controls regulator state; logic HIGH (>1.1 V) enables output; logic LOW (<0.4 V) disables and activates pull-down transistor |
| OUT (B1) | Regulated 1.8 V output | Delivers up to 150 mA; requires ≥1.0 µF X7R ceramic capacitor with 5–500 mΩ ESR for stability and transient response |
| IN (B2) | Input voltage supply | Accepts 2.3–5.5 V; must be filtered to meet PSRR performance; decoupling capacitor recommended close to pin |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor on OUT pin during disable - rapidly discharges downstream capacitance to prevent floating or latch-up in power sequencing |
| Ultra-low noise regulation | 30 µVRMS output noise (10 Hz–100 kHz) - eliminates need for additional filtering in precision analog signal chains |
| Fast transient response | <150 µs startup time to 95% of 1.8 V - supports dynamic power gating in mobile SoC subsystems |
| Robust thermal protection | 160°C junction shutdown with 20 K hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design |
| Miniaturized packaging | 0.76 mm × 0.76 mm × 0.47 mm WLCSP4 with backside coating - enables placement in tight spaces behind displays or under batteries |
Applications
| Smartphone Application Processor I/O Rails | Digital Still Camera Image Sensor Bias |
|---|---|
Use Scenario: Powering 1.8 V I/O banks of application processors in smartphones during active and low-power states. IC Role / Device Role / Timing Role: Primary low-noise, fast-response LDO delivering clean 1.8 V supply with auto-discharge during sleep mode transitions. Use Value: Enables precise voltage tracking and rapid power-state transitions without output voltage overshoot or residual charge affecting processor reset behavior. |
Use Scenario: Supplying bias voltage to CMOS image sensor analog front-end circuits in compact digital cameras. IC Role / Device Role / Timing Role: Low-noise 1.8 V regulator stabilizing sensor reference and pixel readout circuitry during exposure and readout phases. Use Value: Reduces image noise floor by suppressing supply-induced temporal noise, directly improving SNR in low-light capture. |
| Portable Media Player Audio Codec | Personal Navigation Device GPS Baseband |
Use Scenario: Providing regulated 1.8 V supply to stereo audio codec ICs in battery-powered media players. IC Role / Device Role / Timing Role: Ultra-low-noise LDO isolating sensitive audio DAC/ADC circuitry from noisy system power rails. Use Value: Achieves >95 dB SNR in audio playback by minimizing power-supply-induced distortion and jitter in clock domains. |
Use Scenario: Powering GPS baseband processor I/O and RF interface circuits in handheld navigation devices. IC Role / Device Role / Timing Role: Compact, thermally efficient LDO supporting cold-start acquisition and continuous tracking under varying battery voltage. Use Value: Maintains stable 1.8 V operation down to 2.3 V input, extending usable battery life during weak-signal GPS lock scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B182MR-G | Same 1.8 V output, 150 mA rating, and WLP-4 package; higher quiescent current (1 µA vs. 0.1 µA in shutdown) and no auto-discharge | Lacks integrated pull-down; requires external discharge circuit for power sequencing compliance | Choose when lowest shutdown IQ is not required and board space allows discrete discharge solution |
| Rohm BD70522GUL | 1.8 V, 500 mA output; larger DFN-6 package (1.2 × 1.2 mm); 250 mV dropout at full load vs. 45 mV | Higher current capability but significantly higher dropout limits use in low-VIN battery scenarios | Prefer when system demands >150 mA or needs integrated soft-start, but not for ultra-low-VIN operation |
Compared with XC6219B182MR-G and BD70522GUL, LD6816CX4/C18P,315 uniquely combines sub-50 mV dropout, 0.1 µA shutdown IQ, and monolithic auto-discharge in a 0.76 mm² footprint-making it optimal for miniaturized, battery-sensitive portable designs requiring precise power sequencing.
Availability
LD6816CX4/C18P,315 is available at Aetrix Electronics and suitable for smartphone power management, digital camera sensor biasing, and portable navigation device GPS baseband applications requiring stable component supply and long-term lifecycle support.
Supply support for LD6816CX4/C18P,315 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 portable electronics requiring low-noise, low-dropout regulation with intelligent power sequencing - targeting space-constrained applications where WLCSP packaging and auto-discharge are essential.
FAQ
What is the nominal output voltage and tolerance of the LD6816CX4/C18P,315?
The LD6816CX4/C18P,315 delivers a fixed 1.8 V output with ±0.5% tolerance at +25°C and 1 mA load, tightening to ±3% across −40°C to +85°C ambient and 1–150 mA load range. This accuracy ensures reliable operation of 1.8 V I/O interfaces without external feedback adjustment.
Does the LD6816CX4/C18P,315 support auto-discharge, and how does it work?
Yes, the LD6816CX4/C18P,315 includes an integrated pull-down transistor that activates when the EN pin is driven LOW, pulling the OUT pin to GND through a 100 Ω path. This auto-discharge function rapidly drains downstream capacitance, preventing unintended wake-up or latch-up during power-down sequences.
What is the minimum required output capacitor for stable operation of the LD6816CX4/C18P,315?
The LD6816CX4/C18P,315 requires a minimum 0.7 µF ceramic output capacitor (X7R dielectric recommended), with 1.0 µF specified as typical. Capacitor ESR must be between 5 mΩ and 500 mΩ; values outside this range risk instability or degraded transient response.
How does the LD6816CX4/C18P,315 perform under low-input-voltage conditions?
The LD6816CX4/C18P,315 operates down to 2.3 V input and maintains regulation until VIN drops within 45 mV of 1.8 V (i.e., VIN ≥ 1.845 V at 150 mA). This ultra-low dropout enables extended runtime from single-cell Li-ion batteries nearing end-of-discharge.
Is the LD6816CX4/C18P,315 RoHS-compliant and halogen-free?
Yes, the LD6816CX4/C18P,315 is Pb-free, RoHS-compliant, and fully halogen- and antimony-free (NXP "dark green" compliance standard), meeting environmental requirements for consumer and portable electronics markets globally.
LD6816CX4/C18P,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):
- 1.8V
- 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/C18P,315 FAQ
1.How can I place an order for LD6816CX4/C18P,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/C18P,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/C18P,315 reliable?
The price and inventory of LD6816CX4/C18P,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/C18P,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/C18P,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/C18P,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/C18P,315?
LD6816CX4/C18P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/C18P,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/C18P,315?
For technical support, including LD6816CX4/C18P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/C18P,315 requirements.
6.How does Aetrix verify that LD6816CX4/C18P,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/C18P,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/C18P,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/C18P,315?
All LD6816CX4/C18P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/C18P,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/C18P,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/C18P,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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