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NXP Semiconductors LD6816CX4/23P,315
- Part No.:
- LD6816CX4/23P,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
LD6816CX4/23P,315.pdf
- Description:
- IC REG LINEAR 2.3V 150MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:54,000
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Product details
Overview
LD6816CX4/23P,315 from NXP Semiconductors is a 2.3 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 LD6816CX4/23P,315 datasheet, LD6816CX4/23P,315 pinout, LD6816CX4/23P,315 application, or LD6816CX4/23P,315 equivalent, this page provides verified specifications, validated pin functions, confirmed WLCSP4 footprint details, and real-world use cases for portable electronics power rail design.
Technical Context
The LD6816CX4/23P,315 integrates a precision bandgap reference, error amplifier, and PMOS pass transistor with thermal shutdown and current limiting. Its enable input (active HIGH) controls fast start-up (<150 µs) and controlled shutdown (300 µs), while the internal pull-down transistor ensures rapid output discharge when disabled - critical for multi-rail sequencing in battery-powered systems.
Designed for low-noise operation, it achieves 55 dB PSRR at 1 kHz and maintains ±0.5% output accuracy over temperature (−40 °C to +85 °C) and load (1–150 mA). The 0.4 mm pitch WLCSP4 package (0.76 × 0.76 × 0.47 mm) supports high-density PCB layouts without compromising thermal performance (Rth(j-a) = 130 K/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.3 V ±2% (Tamb = −40 °C to +85 °C; IOUT = 1 mA) |
| Dropout voltage | 45 mV typical at 150 mA - enables efficient operation near battery end-of-life (e.g., Li-ion ≥2.35 V) |
| Quiescent current | 0.1 µA typical in shutdown mode - extends standby time in always-on subsystems |
| Output noise | 30 µVRMS (10 Hz–100 kHz) - suitable for powering RF transceivers and ADC reference rails |
| PSRR | 55 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters |
| Enable threshold | VIH = 1.1 V min; VIL = 0.4 V max - compatible with 1.8 V and 3.3 V logic interfaces |
| Pull-down resistance | 100 Ω typical - discharges output to <10% VOUT in ≤300 µs for safe power sequencing |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP4), 0.4 mm pitch, 0.76 mm × 0.76 mm × 0.47 mm body size, 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; requires ≥1.1 V to activate; pulls low to disable and engage auto-discharge |
| OUT (B1) | Regulated output voltage | Delivers 2.3 V to load; includes integrated 100 Ω pull-down transistor active only during disable state |
| IN (B2) | Input voltage supply | Accepts 2.3–5.5 V; requires local 1 µF X7R ceramic capacitor (min 0.7 µF, ESR 5–500 mΩ) for stability |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor on OUT pin ensures rapid discharge during disable - eliminates floating outputs in multi-voltage domain systems |
| Ultra-low noise regulation | 30 µVRMS output noise enables clean power for RF front-ends and precision analog circuits without external filtering |
| Fast transient response | Start-up time <150 µs and shutdown time ≤300 µs support dynamic power gating in low-power microcontrollers |
| Robust protection suite | Thermal shutdown (160 °C), overcurrent limiting (600 mA short-circuit), and 10 kV HBM ESD rating ensure field reliability |
| Miniaturized packaging | 0.76 mm × 0.76 mm WLCSP4 footprint saves >70% board area vs. SOT-23 - ideal for smartphones and wearables |
Applications
| Smartphone Application Processor Core Rail | Digital Still Camera Image Sensor Bias |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU core logic operating at 2.3 V in battery-powered smartphones. IC Role / Device Role / Timing Role: Primary LDO delivering tightly regulated, low-noise 2.3 V supply; sequenced via EN signal synchronized with SoC power management unit. Use Value: 45 mV dropout extends usable battery range by maintaining regulation down to 2.35 V input; auto-discharge prevents back-powering during deep-sleep mode. |
Use Scenario: Supplies bias voltage to CMOS image sensor analog front-end in compact digital cameras. IC Role / Device Role / Timing Role: Low-noise LDO providing stable 2.3 V reference for pixel readout circuitry; enabled only during active capture phase. Use Value: 30 µVRMS noise minimizes fixed-pattern noise in captured images; fast <150 µs start-up reduces shutter lag. |
| Portable Media Player Audio Codec Supply | Personal Navigation Device GPS Baseband IC |
|
Use Scenario: Delivers clean 2.3 V power to stereo audio codec in handheld media players. IC Role / Device Role / Timing Role: Dedicated LDO isolating sensitive audio circuitry from noisy system rails; disabled during playback pause to conserve battery. Use Value: 55 dB PSRR at 1 kHz rejects ripple from shared DC-DC converter; auto-discharge prevents pop/click artifacts during resume. |
Use Scenario: Supplies 2.3 V to GPS baseband processor in battery-operated navigation units. IC Role / Device Role / Timing Role: Low-quiescent-current LDO (0.1 µA shutdown) enabling long-duration cold-start acquisition without draining backup battery. Use Value: Ultra-small WLCSP4 footprint allows placement directly under GPS module; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B231MR-G | 2.3 V fixed output, 150 mA, 65 mV dropout (at 100 mA), no auto-discharge, SOT-25 package | Lacks pull-down transistor; requires external discharge circuit for sequencing-critical designs | Choose when board space permits larger SOT-25 and auto-discharge is unnecessary |
| Richtek RT9013-23GB | 2.3 V fixed output, 300 mA, 250 mV dropout (at 300 mA), 50 µVRMS noise, WDFN-6 package | Higher dropout and noise; larger 1.2 mm × 1.2 mm package; no integrated pull-down | Choose only if higher output current is required and WLCSP4 miniaturization is not critical |
Compared with LD6816CX4/23P,315, the XC6219B231MR-G offers similar voltage/accuracy but lacks auto-discharge and occupies 5× more board area, while the RT9013-23GB trades off noise performance and footprint efficiency for higher current capability - neither matches the LD6816CX4/23P,315's combination of ultra-low dropout, ultra-low noise, and integrated discharge in WLCSP4.
Availability
LD6816CX4/23P,315 is available at Aetrix Electronics and suitable for smartphone power management, digital camera sensor biasing, portable audio codec supplies, and GPS baseband IC regulation requiring stable component supply with guaranteed long-term availability.
Supply support for LD6816CX4/23P,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, low-noise, battery-powered portable electronics - emphasizing sub-50 mV dropout, <1 µA shutdown current, and WLCSP packaging for next-generation mobile devices.
FAQ
What is the nominal output voltage of the LD6816CX4/23P,315?
The LD6816CX4/23P,315 delivers a fixed nominal output voltage of 2.3 V, with guaranteed accuracy of ±2% over temperature (−40 °C to +85 °C) and load (1–150 mA). This value is laser-marked as "L" on the WLCSP4 package per Table 12 of the datasheet, confirming its P-version (pull-down) and 2.3 V output configuration.
Does the LD6816CX4/23P,315 include an auto-discharge function?
Yes, the LD6816CX4/23P,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 auto-discharge function ensures rapid output voltage decay (<300 µs to 10% VOUT) - essential for safe power sequencing in multi-rail portable systems.
What is the recommended output capacitor for stable operation of the LD6816CX4/23P,315?
The LD6816CX4/23P,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. Capacitor ESR must be between 5 mΩ and 500 mΩ; placement should be adjacent to the WLCSP4 package with short, low-inductance traces to ground.
What is the thermal resistance (Rth(j-a)) of the LD6816CX4/23P,315 in typical PCB layout?
The LD6816CX4/23P,315 has a typical junction-to-ambient thermal resistance (Rth(j-a)) of 130 K/W under standard test conditions (2-layer PCB, Tamb = 25 °C). Achieving this value requires solid copper connections on all four bumps - especially GND (A1) - and optional thermal vias beneath the package to inner ground/power planes.
How does the LD6816CX4/23P,315 compare to the H-version (e.g., LD6816CX4/23H) in disable behavior?
Unlike the LD6816CX4/23H, which enters a high-ohmic (tri-state) output condition when disabled, the LD6816CX4/23P,315 actively pulls the OUT pin LOW via its integrated 100 Ω transistor. This fundamental difference makes the LD6816CX4/23P,315 suitable for applications requiring automatic discharge, while the H-version is used where output floating is acceptable or desired.
LD6816CX4/23P,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):
- 2.3V
- 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)
LD6816CX4/23P,315 FAQ
1.How can I place an order for LD6816CX4/23P,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/23P,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 LD6816CX4/23P,315 reliable?
The price and inventory of LD6816CX4/23P,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6816CX4/23P,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/23P,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/23P,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/23P,315?
LD6816CX4/23P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/23P,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 LD6816CX4/23P,315?
For technical support, including LD6816CX4/23P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/23P,315 requirements.
6.How does Aetrix verify that LD6816CX4/23P,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/23P,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 LD6816CX4/23P,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/23P,315?
All LD6816CX4/23P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/23P,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 LD6816CX4/23P,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/23P,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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