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NXP Semiconductors LD6816CX4/18H,315
- Part No.:
- LD6816CX4/18H,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
LD6816CX4/18H,315.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
LD6816CX4/18H,315 from NXP Semiconductors is a 1.8 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 high-ohmic (3-state) output during disable-designed for power-sensitive mobile interfaces including smartphone baseband and camera sensor rails.
For engineers reviewing the LD6816CX4/18H,315 datasheet, LD6816CX4/18H,315 pinout, LD6816CX4/18H,315 application, or LD6816CX4/18H,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 footprint compatibility with space-constrained portable PCB layouts.
Technical Context
The LD6816CX4/18H,315 implements a PMOS pass transistor architecture enabling ultra-low dropout operation down to 45 mV at 150 mA, with internal voltage reference and error amplifier delivering tight output regulation across −40°C to +85°C ambient. Its enable input (VEN) accepts active-HIGH logic with VIH ≥1.1 V and VIL ≤0.4 V, independent of input voltage.
Thermal protection triggers shutdown at 160°C junction temperature with 20 K hysteresis, while overcurrent limiting caps peak output at 300 mA (for VO(nom) ≥1.8 V) and short-circuit current at 600 mA. The device operates from 2.3 V to 5.5 V input and requires only a 1.0 µF X7R ceramic output capacitor for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±0.5% at +25°C; ±3% over −30°C to +85°C - ensures stable core voltage for low-power ASICs and image sensors. |
| Dropout Voltage | 45 mV typical at 150 mA - enables operation with minimal VIN–VOUT headroom, extending battery runtime in single-cell Li-ion systems. |
| PSRR | 55 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding noisy power domains. |
| Output Noise | 30 µVRMS (10 Hz–100 kHz) - meets stringent noise requirements for analog front-ends and RF bias rails. |
| Quiescent Current | 70–100 µA active; 0.1 µA in shutdown - minimizes standby power loss in always-on subsystems. |
| Startup Time | <150 µs to 95% of 1.8 V - supports fast wake-up sequences in power-gated mobile SoC domains. |
| Enable Threshold | VIH = 1.1 V min; VIL = 0.4 V max - compatible with 1.8 V GPIO without level-shifting. |
Pinout & Package
LD6816CX4/18H,315 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 arranged in a 2×2 grid and index area marking bump A1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (A1) | Supply ground reference | Primary return path for regulator current; must connect to low-impedance ground plane for noise and thermal performance. |
| EN (A2) | Active-HIGH enable input | Controls regulator state; drives high (>1.1 V) to activate, low (<0.4 V) to enter high-ohmic shutdown mode. |
| OUT (B1) | Regulated output voltage | Delivers 1.8 V to load; presents high-impedance (3-state) when disabled-no auto-discharge required. |
| IN (B2) | Input voltage supply | Accepts 2.3–5.5 V; requires local 1 µF ceramic decoupling close to pin for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 45 mV at 150 mA enables use with <2.0 V input sources (e.g., partially discharged Li-ion cells). |
| Low-noise regulation | 30 µVRMS noise supports clean power for precision analog circuits without external filtering. |
| Fast enable control | <150 µs startup and 300 µs shutdown times allow dynamic power sequencing in multi-rail systems. |
| High-ohmic disable | Open-circuit output during shutdown isolates downstream circuitry, preventing backfeed or leakage paths. |
| Robust protection | Integrated thermal shutdown (160°C), current limiting (300 mA peak), and 10 kV HBM ESD rating ensure field reliability. |
Applications
| Smartphone Baseband Core | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Powers ARM-based application processor cores requiring tightly regulated 1.8 V with fast transient response during burst-mode operation. IC Role / Device Role / Timing Role: Primary LDO for SoC I/O or memory interface domain, activated synchronously with system wake-up signals. Use Value: 45 mV dropout extends usable battery range; 55 dB PSRR rejects noise from shared PMIC switchers; 0.1 µA shutdown current preserves battery during sleep. |
Use Scenario: Supplies bias voltage to CMOS image sensor analog front-end, where supply noise directly impacts image SNR. IC Role / Device Role / Timing Role: Low-noise post-regulator placed after main DC-DC converter to clean residual ripple before sensor analog chain. Use Value: 30 µVRMS output noise prevents fixed-pattern noise in captured images; WLCSP4 footprint fits tight space behind camera module. |
| Portable Media Player Audio Codec | Bluetooth LE SoC I/O Rail |
|
Use Scenario: Provides clean 1.8 V to stereo audio codec's digital I/O interface, minimizing jitter and data corruption. IC Role / Device Role / Timing Role: Dedicated LDO for codec SPI/I²S interface, enabled only during playback to reduce system idle power. Use Value: High-ohmic disable prevents signal contention on shared bus lines; ±0.5% output accuracy maintains timing margin for high-speed serial links. |
Use Scenario: Supplies 1.8 V to Bluetooth 5.0 SoC GPIO and radio interface pins in wearables with strict size constraints. IC Role / Device Role / Timing Role: Compact point-of-load regulator co-located with SoC, controlled by host MCU enable signal. Use Value: 0.76 mm × 0.76 mm WLCSP4 package saves >60% board area vs. SOT-23; 1.1 V VIH enables direct drive from 1.8 V microcontroller outputs. |
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 at 200 mA; SOT-23-5 package; 12 µVRMS noise | Higher dropout limits use in low-headroom battery systems; larger SOT-23 footprint increases layout area | Choose when lower noise is critical and board space allows SOT-23; avoid if VIN < 2.0 V or miniaturization is mandatory. |
| MCP1700T-1802E/TT | 1.8 V, 250 mA, 178 mV dropout at 250 mA; SOT-23-3 package; 30 µVRMS noise; no enable pin | No enable function eliminates sequencing control; higher dropout reduces efficiency in Li-ion discharge curve | Choose for cost-sensitive, always-on applications where enable control and ultra-low dropout are not required. |
Compared with TPS7A0518PDBVR and MCP1700T-1802E/TT, LD6816CX4/18H,315 delivers superior dropout performance in the smallest footprint, enabling longer battery life and tighter integration in next-gen portable designs-without sacrificing noise or accuracy.
Availability
LD6816CX4/18H,315 is available at Aetrix Electronics and suitable for smartphone baseband, camera sensor bias, portable media player audio, Bluetooth LE SoC I/O, and wearable power management applications requiring stable component supply and long-term lifecycle support.
Supply support for LD6816CX4/18H,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 focused on secure connectivity solutions for automotive, industrial, and consumer markets, with deep expertise in power management ICs and RF technologies.
The LD6816 series was designed specifically for ultra-miniaturized, low-noise power delivery in battery-powered mobile devices-emphasizing wafer-level packaging, sub-50 mV dropout, and robust protection for high-reliability portable electronics.
FAQ
What is the nominal output voltage and tolerance of LD6816CX4/18H,315?
The LD6816CX4/18H,315 provides a fixed 1.8 V output with ±0.5% tolerance at +25°C and ±3% over the full operating temperature range (−30°C to +85°C). This accuracy is verified per Table 9 in the NXP datasheet and ensures reliable operation for 1.8 V I/O standards in mobile SoCs and sensors.
Does LD6816CX4/18H,315 support auto-discharge functionality?
No, LD6816CX4/18H,315 does not include auto-discharge. As indicated by the "H" suffix, it features a high-ohmic (3-state) output during disable-meaning the OUT pin floats rather than pulling low. For auto-discharge, select "P" or "CxxP" variants like LD6816CX4/18P.
What is the minimum recommended output capacitor for LD6816CX4/18H,315?
The LD6816CX4/18H,315 requires a minimum 0.7 µF X7R ceramic capacitor at the OUT pin, with 1.0 µF recommended for optimal stability and transient response. Equivalent Series Resistance (ESR) must be between 5 mΩ and 500 mΩ, and the capacitor must meet ±30% tolerance over temperature.
Can LD6816CX4/18H,315 operate from a 2.0 V input supply?
No-LD6816CX4/18H,315 has a minimum input voltage of 2.3 V per Table 7. At 1.8 V output, a 2.0 V input falls below the required headroom even for ultra-low dropout operation. Valid input range is strictly 2.3 V to 5.5 V for guaranteed regulation and protection functionality.
What package type and dimensions does LD6816CX4/18H,315 use?
LD6816CX4/18H,315 uses a Wafer-Level Chip-Scale Package (WLCSP4) with 0.4 mm bump pitch, measuring 0.76 mm × 0.76 mm × 0.47 mm. It features four solder bumps in a 2×2 array, with bump A1 serving as the index corner-fully documented in Figure 24 and Table 14 of the NXP datasheet.
LD6816CX4/18H,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)
LD6816CX4/18H,315 FAQ
1.How can I place an order for LD6816CX4/18H,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/18H,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 LD6816CX4/18H,315 reliable?
The price and inventory of LD6816CX4/18H,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6816CX4/18H,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/18H,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/18H,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/18H,315?
LD6816CX4/18H,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/18H,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 LD6816CX4/18H,315?
For technical support, including LD6816CX4/18H,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/18H,315 requirements.
6.How does Aetrix verify that LD6816CX4/18H,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/18H,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 LD6816CX4/18H,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/18H,315?
All LD6816CX4/18H,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/18H,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 LD6816CX4/18H,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/18H,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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