My Inquiry
My Account
NXP Semiconductors LD6816CX4/18P,315
- Part No.:
- LD6816CX4/18P,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
LD6816CX4/18P,315.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LD6816CX4/18P,315 from NXP Semiconductors is a 1.8 V fixed-output, 150 mA ultra-low-dropout linear regulator in WLCSP4 package (0.76 mm × 0.76 mm × 0.47 mm), featuring 45 mV dropout at full load, 30 µVRMS output noise (10 Hz–100 kHz), and integrated auto-discharge pull-down transistor for rapid output discharge during disable. It serves as a precision local power rail for low-voltage analog/digital circuitry in space-constrained portable electronics.
For engineers reviewing the LD6816CX4/18P,315 datasheet, LD6816CX4/18P,315 pinout, LD6816CX4/18P,315 application, or LD6816CX4/18P,315 equivalent, key selection criteria include its 1.8 V fixed output with ±0.5% accuracy at +25 °C, active-HIGH enable interface, 150 µs startup time, and WLCSP4-compatible reflow soldering profile - all critical for battery-powered mobile SoC subsystems requiring fast transient response and low quiescent current.
Technical Context
The LD6816CX4/18P,315 implements a PMOS pass transistor architecture enabling ultra-low dropout (45 mV @ 150 mA) and high PSRR (55 dB @ 1 kHz). Its internal reference generator and feedback network deliver tight output voltage regulation across temperature (±3% over −40 °C to +85 °C) and load (1 mA–150 mA).
Unlike high-ohmic disable variants (e.g., /xxH), this /xxP suffix denotes an integrated pull-down switch (Rpd = 100 Ω typical) that actively discharges the output node during shutdown, eliminating external discharge resistors and reducing system-level power-down latency in multi-rail mobile platforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±0.5% at +25 °C; enables direct powering of 1.8 V I/O domains without external feedback components. |
| Dropout Voltage | 45 mV typical at 150 mA; allows operation from 2.3 V input down to 1.845 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 the LDO input. |
| Output Noise | 30 µVRMS (10 Hz–100 kHz); supports noise-sensitive analog circuits like ADC references and RF bias rails. |
| Quiescent Current | 70–100 µA active; 0.1 µA typical in shutdown; extends standby time in always-on sensor nodes. |
| Enable Threshold | VIH = 1.1 V min, VIL = 0.4 V max; compatible with 1.8 V GPIO logic without level-shifting. |
| Startup Time | <150 µs to 95% of 1.8 V; meets fast wake-up timing requirements in mobile application processors. |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP4), 0.4 mm pitch, 0.76 mm × 0.76 mm footprint, 0.47 mm height, Pb-free/RoHS/halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (A1) | Supply ground reference | Primary return path for regulator current; must connect to solid ground plane for thermal and noise performance. |
| EN (A2) | Active-HIGH enable input | Drives internal pass transistor; logic HIGH ≥1.1 V enables regulation; logic LOW ≤0.4 V disables with auto-discharge active. |
| OUT (B1) | Regulated output voltage | Delivers stable 1.8 V to load; includes integrated 100 Ω pull-down for rapid discharge when EN = LOW. |
| IN (B2) | Input supply voltage | Accepts 2.3 V–5.5 V; requires ≥0.7 µF X7R ceramic capacitor with ESR 5–500 mΩ for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor on OUT pin ensures sub-300 µs output discharge during disable - eliminates need for external resistor and saves PCB area. |
| Ultra-low noise regulation | 30 µVRMS output noise (10 Hz–100 kHz) enables clean power for precision analog blocks without additional filtering. |
| High PSRR at low frequency | 55 dB rejection at 1 kHz suppresses ripple from buck converter switching frequencies and their harmonics. |
| Thermal & current protection | Over-temperature shutdown at 160 °C with 20 K hysteresis and current limiting prevent damage under fault conditions. |
| Miniaturized WLCSP4 footprint | 0.76 mm × 0.76 mm package enables placement directly beneath BGA SoCs or in narrow board edges - ideal for smartphones and wearables. |
Applications
| Mobile Application Processor I/O Rail | Low-Power Sensor Interface |
|---|---|
|
Use Scenario: Powering 1.8 V I/O banks of application processors in smartphones during active and sleep modes. IC Role / Device Role / Timing Role: Local LDO providing regulated 1.8 V with fast enable/disable control synchronized to processor power states. Use Value: Auto-discharge ensures rapid I/O voltage collapse during deep-sleep entry, preventing leakage through unpowered peripherals. |
Use Scenario: Supplying analog front-end (AFE) and ADC reference voltage in wearable health monitors. IC Role / Device Role / Timing Role: Ultra-low-noise 1.8 V source decoupled from noisy digital supplies. Use Value: 30 µVRMS noise and 55 dB PSRR preserve signal integrity for sub-12-bit medical-grade measurements. |
| RF Transceiver Bias Rail | Camera Module Core Logic |
|
Use Scenario: Delivering clean 1.8 V bias to RF power amplifiers and LNAs in cellular IoT modules. IC Role / Device Role / Timing Role: Low-noise, high-PSRR post-regulator isolating RF circuitry from noisy system DC-DC outputs. Use Value: 45 mV dropout enables efficient operation from shared 2.5 V intermediate bus, minimizing thermal dissipation. |
Use Scenario: Powering image signal processor (ISP) core logic and MIPI interface in compact digital cameras. IC Role / Device Role / Timing Role: Fast-starting (≤150 µs), small-footprint LDO meeting tight sequencing and space constraints. Use Value: WLCSP4 package allows direct mounting under camera module connector, reducing trace inductance and EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0518PDBVR | 1.8 V, 200 mA, 170 mV dropout (typ), SOT-23-5 package (2.9 mm × 1.6 mm) | Larger footprint; no auto-discharge; higher dropout limits use with lower input voltages | Select when board space permits larger package and auto-discharge is not required. |
| MCP1700T-1802E/TT | 1.8 V, 250 mA, 175 mV dropout (typ), SOT-23-3 package; no enable pin or auto-discharge | Fixed-on operation only; lacks enable control and output discharge capability | Select for cost-sensitive, always-on applications where enable sequencing and fast shutdown are unnecessary. |
Compared with TPS7A0518PDBVR and MCP1700T-1802E/TT, LD6816CX4/18P,315 delivers superior miniaturization (0.58 mm² vs. 4.64 mm² and 2.5 mm²), lower dropout (45 mV vs. 170/175 mV), and unique auto-discharge - making it optimal for space- and power-constrained mobile designs requiring precise enable control.
Availability
LD6816CX4/18P,315 is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor subsystems, and compact camera modules requiring stable component supply, consistent WLCSP4 packaging, and guaranteed automotive-grade reliability screening.
Supply support for LD6816CX4/18P,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 leader specializing in secure connectivity solutions for automotive, industrial, and mobile markets, with broad analog and power management IP.
The LD6816 series was designed specifically for ultra-miniaturized, low-noise power delivery in portable consumer electronics - emphasizing wafer-level packaging, sub-50 mV dropout, and integrated system-level features like auto-discharge.
FAQ
What is the nominal output voltage and tolerance of the LD6816CX4/18P,315?
The LD6816CX4/18P,315 provides a fixed 1.8 V output with ±0.5% tolerance at +25 °C and ±3% over the full operating temperature range (−40 °C to +85 °C). This accuracy is achieved via laser-trimmed internal feedback resistors and is specified in Table 9 of the NXP datasheet under ΔVO parameter conditions.
Does the LD6816CX4/18P,315 include an auto-discharge function, and how does it operate?
Yes, the LD6816CX4/18P,315 includes an integrated pull-down transistor that activates when the EN pin is driven LOW, pulling the OUT pin to GND through a typical 100 Ω resistance. This feature ensures rapid discharge of output capacitance (tsd(reg) < 300 µs), eliminating the need for external discharge resistors in portable systems.
What is the recommended output capacitor for stable operation of the LD6816CX4/18P,315?
The LD6816CX4/18P,315 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. The capacitor must meet ±30% tolerance over −40 °C to +125 °C per Table 10 and Section 10.1 of the NXP datasheet.
What are the thermal limitations and junction-to-ambient resistance of the LD6816CX4/18P,315?
The LD6816CX4/18P,315 has a maximum junction temperature of +125 °C and a typical Rth(j-a) of 130 K/W under standard two-layer PCB conditions (Table 8). Effective thermal performance requires solid copper connections on all pins and avoidance of solder-mask under the die to minimize thermal resistance.
How does the LD6816CX4/18P,315 differ from the /xxH variant in disable behavior?
Unlike the LD6816CX4/18H which enters a high-impedance (3-state) output condition when disabled, the LD6816CX4/18P,315 actively pulls the OUT pin LOW via its integrated 100 Ω pull-down transistor. This difference is explicitly defined in Section 1.1 and Table 4 of the NXP datasheet and determines system-level discharge requirements.
LD6816CX4/18P,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):
- 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)
LD6816CX4/18P,315 FAQ
1.How can I place an order for LD6816CX4/18P,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/18P,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 LD6816CX4/18P,315 reliable?
The price and inventory of LD6816CX4/18P,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6816CX4/18P,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/18P,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/18P,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/18P,315?
LD6816CX4/18P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/18P,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 LD6816CX4/18P,315?
For technical support, including LD6816CX4/18P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/18P,315 requirements.
6.How does Aetrix verify that LD6816CX4/18P,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/18P,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 LD6816CX4/18P,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/18P,315?
All LD6816CX4/18P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/18P,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 LD6816CX4/18P,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/18P,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD6816CX4/18P,315 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
