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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

NXP Semiconductors LD6816CX4/C28P,315

Name: LD6816CX4/C28P,315
Brand: NXP Semiconductors
SKU: LD6816CX4/C28P,315
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD6816CX4/C28P,315

Manufacturer:: NXP Semiconductors

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 4-UFBGA, WLCSP

Datasheet:: LD6816CX4/C28P,315.pdf

Description:: IC REG LINEAR FIXED LDO REG

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LD6816CX4/C28P,315 from NXP Semiconductors is a 2.8 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 µV_RMS 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 rails in space-constrained portable electronics.

For engineers reviewing the LD6816CX4/C28P,315 datasheet, LD6816CX4/C28P,315 pinout, LD6816CX4/C28P,315 application, or LD6816CX4/C28P,315 equivalent, key selection criteria include its 2.8 V fixed output, WLCSP4 footprint compatibility, enable-controlled auto-discharge behavior, low-noise performance for RF/analog subsystems, and thermal shutdown protection at 160 °C.

Technical Context

The LD6816CX4/C28P,315 implements a PMOS pass transistor architecture enabling ultra-low dropout (45 mV @ 150 mA) and fast start-up (<150 µs). Its internal reference and error amplifier maintain ±0.5% output accuracy over temperature and load, while the dedicated EN pin (VIH = 1.1 V, VIL = 0.4 V) controls both regulation and active pull-down discharge.

Unlike high-ohmic disable variants, this part integrates a 100 Ω pull-down switch on OUT during disable mode-enabling rapid output voltage decay (tsd(reg) = 300 µs with 1 µF load capacitor)-critical for sequencing in multi-rail systems. PSRR reaches −55 dB at 1 kHz and remains >−40 dB up to 100 kHz under 150 mA load.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8 V ±2% over −40 °C to +85 °C; ensures stable core voltage for 2.8 V I/O interfaces without external feedback.
Dropout Voltage	45 mV typical at 150 mA; enables operation with VIN as low as 2.845 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 sensitive RF or ADC circuits.
Output Noise	30 µV_RMS (10 Hz–100 kHz); meets low-noise requirements for precision analog sensors and audio codecs.
Quiescent Current	0.1 µA typical in shutdown (VEN ≤ 0.4 V); minimizes leakage current in always-on system standby modes.
Enable Threshold	VIH = 1.1 V min, VIL = 0.4 V max; compatible with 1.8 V and 3.3 V GPIO logic without level-shifting.
Pull-down Resistance	100 Ω typical; discharges 1 µF output capacitance to 5% of 2.8 V in <300 µs, supporting tight power sequencing windows.

Pinout & Package

LD6816CX4/C28P,315 uses a 4-bump Wafer-Level Chip-Scale Package (WLCSP4) with 0.4 mm pitch, dimensions 0.76 mm × 0.76 mm × 0.47 mm, and backside coating for enhanced mechanical robustness and moisture resistance.

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	Controls LDO activation and triggers integrated pull-down transistor when logic LOW (≤0.4 V).
OUT (B1)	Regulated output voltage	Delivers 2.8 V to load; includes internal 100 Ω pull-down to GND when disabled for auto-discharge.
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 enables rapid voltage decay (<300 µs) during disable-critical for safe power sequencing in multi-voltage SoC designs.
Ultra-low noise output	30 µV_RMS noise (10 Hz–100 kHz) supports clean power delivery to RF transceivers, high-resolution ADCs, and audio amplifiers without additional filtering.
High PSRR across frequency	−55 dB at 1 kHz and >−40 dB up to 100 kHz under 150 mA load-effectively isolates noise from noisy DC-DC sources in mixed-signal applications.
Low dropout architecture	45 mV dropout at 150 mA allows operation with minimal headroom (e.g., 2.845 V IN for 2.8 V OUT), extending usable battery range in portable devices.
Robust protection suite	Includes over-temperature shutdown (160 °C), current limiting (600 mA short-circuit), and 10 kV HBM ESD protection-reducing need for external protection components.

Applications

Smartphone Baseband Power	Digital Camera Sensor Bias
Use Scenario: Powers baseband processor I/O banks requiring precise 2.8 V rail with fast transient response and minimal noise coupling into RF front-end. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.8 V to baseband ASIC I/O interface; enabled/disabled synchronously with processor sleep/wake cycles. Use Value: Auto-discharge ensures rapid rail collapse during deep-sleep entry, preventing unintended leakage paths; 30 µV_RMS noise avoids corruption of adjacent RF receive sensitivity.	Use Scenario: Supplies bias voltage to CMOS image sensor analog front-end where supply ripple directly impacts image SNR and fixed-pattern noise. IC Role / Device Role / Timing Role: Low-noise post-regulator for sensor analog core; sequenced after main camera power rail using EN control. Use Value: −55 dB PSRR at 1 kHz rejects switching noise from camera module DC-DC; 45 mV dropout enables use of partially discharged battery without brownout risk.
Portable Media Player Audio Codec	Bluetooth LE Module I/O Interface
Use Scenario: Provides clean 2.8 V supply to stereo audio DAC/ADC in battery-powered media players where audible noise must be minimized. IC Role / Device Role / Timing Role: Dedicated low-noise LDO for audio signal chain; enabled only during playback/recording to conserve power. Use Value: 30 µV_RMS output noise eliminates hiss in headphone output; 0.1 µA shutdown current extends standby time between user sessions.	Use Scenario: Powers 2.8 V I/O interface of Bluetooth Low Energy SoC in wearables, where compact size and sequencing reliability are critical. IC Role / Device Role / Timing Role: Compact WLCSP4 LDO supplying BLE radio digital I/O; EN synchronized to host MCU's peripheral power management. Use Value: 0.76 mm × 0.76 mm footprint saves PCB area in space-constrained wristbands; auto-discharge prevents bus contention during BLE reset sequences.

Smartphone Baseband Power

Digital Camera Sensor Bias

Use Scenario: Powers baseband processor I/O banks requiring precise 2.8 V rail with fast transient response and minimal noise coupling into RF front-end.

IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.8 V to baseband ASIC I/O interface; enabled/disabled synchronously with processor sleep/wake cycles.

Use Value: Auto-discharge ensures rapid rail collapse during deep-sleep entry, preventing unintended leakage paths; 30 µV_RMS noise avoids corruption of adjacent RF receive sensitivity.

Use Scenario: Supplies bias voltage to CMOS image sensor analog front-end where supply ripple directly impacts image SNR and fixed-pattern noise.

IC Role / Device Role / Timing Role: Low-noise post-regulator for sensor analog core; sequenced after main camera power rail using EN control.

Use Value: −55 dB PSRR at 1 kHz rejects switching noise from camera module DC-DC; 45 mV dropout enables use of partially discharged battery without brownout risk.

Portable Media Player Audio Codec

Bluetooth LE Module I/O Interface

Use Scenario: Provides clean 2.8 V supply to stereo audio DAC/ADC in battery-powered media players where audible noise must be minimized.

IC Role / Device Role / Timing Role: Dedicated low-noise LDO for audio signal chain; enabled only during playback/recording to conserve power.

Use Value: 30 µV_RMS output noise eliminates hiss in headphone output; 0.1 µA shutdown current extends standby time between user sessions.

Use Scenario: Powers 2.8 V I/O interface of Bluetooth Low Energy SoC in wearables, where compact size and sequencing reliability are critical.

IC Role / Device Role / Timing Role: Compact WLCSP4 LDO supplying BLE radio digital I/O; EN synchronized to host MCU's peripheral power management.

Use Value: 0.76 mm × 0.76 mm footprint saves PCB area in space-constrained wristbands; auto-discharge prevents bus contention during BLE reset sequences.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6219B282MR-G	2.8 V fixed output, 150 mA, 60 mV dropout (typ), no auto-discharge; SOT-25 package (2.9 mm × 2.8 mm).	Larger footprint; lacks pull-down function-requires external discharge circuit for sequencing.	Select when board area permits larger package and auto-discharge is not required; offers similar noise (25 µV_RMS) but higher dropout reduces battery efficiency.
Richtek RT9013-28GB	2.8 V fixed output, 500 mA, 250 mV dropout (typ), no auto-discharge; DFN-6 (2.0 mm × 2.0 mm).	Higher current rating but significantly higher dropout and no integrated pull-down; larger than WLCSP4.	Choose for higher load margin (up to 500 mA) where sequencing is handled externally; trade-off is 5.6× larger footprint and reduced light-load efficiency.

Compared with LD6816CX4/C28P,315, the XC6219B282MR-G provides lower noise but sacrifices miniaturization and auto-discharge; the RT9013-28GB trades off footprint and dropout for higher current capacity-neither matches the LD6816CX4/C28P,315's combination of ultra-low dropout, WLCSP4 size, and integrated discharge in a 2.8 V LDO.

Availability

LD6816CX4/C28P,315 is available at Aetrix Electronics and suitable for smartphone baseband power, digital camera sensor bias, portable media player audio codec, and Bluetooth LE module I/O interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LD6816CX4/C28P,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 markets, with leadership in power management, RF, and microcontroller technologies.

The LD6816 series was designed specifically for ultra-miniaturized portable electronics demanding ultra-low dropout, low noise, and integrated power sequencing-targeting smartphones, wearables, and imaging modules where board space and battery life are critical constraints.

FAQ

What is the nominal output voltage of the LD6816CX4/C28P,315?

The LD6816CX4/C28P,315 delivers a fixed nominal output voltage of 2.8 V, with guaranteed accuracy of ±2% over the full operating temperature range (−40 °C to +85 °C) and load conditions (1 mA to 150 mA). This value is confirmed in Table 5 of the NXP datasheet under "Type number extension of pull-down output in WLCSP4 with backside coating" where LD6816CX4/C28P maps to 2.8 V.

Does the LD6816CX4/C28P,315 include an auto-discharge function?

Yes, the LD6816CX4/C28P,315 includes an integrated auto-discharge function: when the EN pin is driven LOW, an internal 100 Ω pull-down transistor connects the OUT pin to GND, discharging a 1 µF output capacitor to 5% of 2.8 V in under 300 µs. This behavior is explicitly defined for the "CxxP" variant family in Section 1.1 and Table 5 of the datasheet.

What package type and dimensions does the LD6816CX4/C28P,315 use?

The LD6816CX4/C28P,315 uses a Wafer-Level Chip-Scale Package (WLCSP4) with backside coating, measuring 0.76 mm × 0.76 mm × 0.47 mm and 0.4 mm bump pitch. Dimensions are specified in Table 15 (Figure 25) of the datasheet, confirming the "C" prefix denotes the coated variant with slightly increased package thickness (A = 0.47–0.55 mm).

What is the maximum input voltage rating for the LD6816CX4/C28P,315?

The absolute maximum input voltage rating for the LD6816CX4/C28P,315 is +6.0 V for 4 ms transients, as stated in Table 6 ("Limiting values") of the datasheet. The recommended operating input voltage range is 2.3 V to 5.5 V per Table 7, ensuring reliable regulation and thermal performance within specification.

How does the LD6816CX4/C28P,315 achieve low output noise performance?

The LD6816CX4/C28P,315 achieves 30 µV_RMS output noise (10 Hz–100 kHz) through optimized internal bandgap reference design, low-noise error amplifier topology, and careful layout isolation-all verified in Table 9 ("Electrical characteristics") and Figure 12 ("Noise density"). Performance is measured with 1 µF X7R output capacitor and zero load current.

LD6816CX4/C28P,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):: 2.8V

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/C28P,315 FAQ

1.How can I place an order for LD6816CX4/C28P,315 through Aetrix?

Please submit a Request for Quotation (RFQ) for LD6816CX4/C28P,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/C28P,315 reliable?

The price and inventory of LD6816CX4/C28P,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/C28P,315 is usually 5 days.

3.What payment methods are accepted for LD6816CX4/C28P,315?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/C28P,315 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD6816CX4/C28P,315?

LD6816CX4/C28P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD6816CX4/C28P,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/C28P,315?

For technical support, including LD6816CX4/C28P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/C28P,315 requirements.

6.How does Aetrix verify that LD6816CX4/C28P,315 is sourced from the original manufacturer or authorized distributors?

All LD6816CX4/C28P,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/C28P,315 meets industry standards.

7.What is the process for return or replacement of LD6816CX4/C28P,315?

All LD6816CX4/C28P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/C28P,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/C28P,315 part is unused and in its original packaging.

Return procedure for LD6816CX4/C28P,315:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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