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

NXP Semiconductors LD6816CX4/C27P,315

Name: LD6816CX4/C27P,315
Brand: NXP Semiconductors
SKU: LD6816CX4/C27P,315
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD6816CX4/C27P,315

Manufacturer:: NXP Semiconductors

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

Package:: 4-UFBGA, WLCSP

Datasheet:: LD6816CX4/C27P,315.pdf

Description:: IC REG LINEAR FIXED LDO REG

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LD6816CX4/C27P,315 from NXP Semiconductors is a 2.7 V fixed-output, 150 mA ultra-low-dropout linear regulator in WLCSP4 package with auto-discharge (pull-down) function. It delivers 45 mV dropout at full load, 30 µV_RMS output noise (10 Hz–100 kHz), and 55 dB PSRR at 1 kHz-designed for powering noise-sensitive analog/digital interfaces in space-constrained mobile devices.

For engineers reviewing the LD6816CX4/C27P,315 datasheet, LD6816CX4/C27P,315 pinout, LD6816CX4/C27P,315 application, or LD6816CX4/C27P,315 equivalent, this page provides verified electrical specs, thermal behavior, enable timing, output stability requirements, and real-world substitution guidance for portable power rail design.

Technical Context

The LD6816CX4/C27P,315 integrates a precision bandgap reference, low-noise error amplifier, and NMOS pass transistor optimized for sub-50 mV dropout. Its auto-discharge function uses an internal 100 Ω pull-down switch activated during disable to rapidly discharge output capacitance-critical for sequencing in multi-rail systems.

It operates across −40 °C to +85 °C ambient, supports input voltages from 2.3 V to 5.5 V, and maintains ±0.5% output accuracy at 25 °C with 1 mA load. Over-temperature shutdown triggers at 160 °C with 20 K hysteresis, and current limiting caps peak output at 300 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.7 V ±2% over −40 °C to +85 °C; enables direct replacement of 2.7 V logic rails without external feedback.
Dropout Voltage	45 mV typical at 150 mA; allows operation with VIN as low as 2.745 V, maximizing battery runtime in Li-ion and coin-cell applications.
PSRR	55 dB at 1 kHz; suppresses switching noise from upstream DC-DC converters feeding sensitive RF or ADC circuitry.
Output Noise	30 µV_RMS (10 Hz–100 kHz); meets low-noise requirements for audio codecs, camera sensors, and precision analog front-ends.
Enable Threshold	V_IH = 1.1 V min, V_IL = 0.4 V max; compatible with 1.8 V and 3.3 V GPIOs without level-shifting.
Shutdown Current	0.1 µA typical; reduces system standby power in always-on sensor nodes and wearable devices.
Start-up Time	<150 µs to 95% of 2.7 V; supports fast wake-up from deep-sleep modes in mobile SoCs.

Pinout & Package

LD6816CX4/C27P,315 uses a 0.4 mm pitch Wafer-Level Chip-Scale Package (WLCSP4), measuring 0.76 mm × 0.76 mm × 0.47 mm with 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 to minimize thermal resistance (R_th(j-a) = 130 K/W).
EN (A2)	Active-HIGH enable input	Drives internal pass transistor; logic HIGH ≥1.1 V enables regulation; LOW ≤0.4 V disables with auto-discharge active.
OUT (B1)	Regulated output voltage	Delivers stable 2.7 V; requires ≥1.0 µF X7R ceramic capacitor with ESR 5–500 mΩ for stability and controlled shutdown time.
IN (B2)	Input voltage supply	Accepts 2.3–5.5 V; transient rating up to +6.0 V for 4 ms; decoupling recommended within 2 mm of pin.

Key Features

Feature	Design Value
Auto-discharge function	Integrated 100 Ω pull-down switch discharges output to <10% V_OUT in ≤300 µs-enables clean power sequencing and prevents floating outputs.
Ultra-low noise performance	30 µV_RMS output noise ensures minimal jitter injection into clock-sensitive circuits like PLLs and high-speed ADCs.
High PSRR at low frequencies	55 dB rejection at 1 kHz mitigates ripple from buck converter switching edges, preserving signal integrity in mixed-signal ICs.
Thermal and current protection	160 °C over-temperature shutdown with 20 K hysteresis and 300 mA peak current limit prevent damage during fault conditions.
Miniaturized WLCSP4 package	0.76 mm × 0.76 mm footprint with 0.4 mm bump pitch enables placement in tight spaces-ideal for smartphones, TWS earbuds, and compact IoT modules.

Applications

Smartphone Baseband Power	Wearable Sensor Hub Supply
Use Scenario: Powers 2.7 V I/O interface of cellular modem baseband processor during active data transmission. IC Role / Device Role / Timing Role: Primary LDO delivering clean, sequenced 2.7 V rail with fast start-up and auto-discharge for modem sleep/wake cycles. Use Value: Enables <150 µs wake-up latency and eliminates residual charge on shared bus lines-reducing inter-rail coupling and improving RF isolation.	Use Scenario: Supplies 2.7 V to MEMS accelerometer/gyroscope cluster in fitness tracker with intermittent motion sensing. IC Role / Device Role / Timing Role: Low-quiescent-current (0.1 µA) LDO providing regulated voltage only during sensor sampling bursts. Use Value: Extends battery life by minimizing standby leakage while maintaining rapid response to motion-triggered wake events.
Digital Camera Image Sensor Bias	Bluetooth Audio Codec Reference
Use Scenario: Provides ultra-low-noise 2.7 V bias for CMOS image sensor analog front-end in compact digital still cameras. IC Role / Device Role / Timing Role: Low-noise LDO rejecting power supply ripple to preserve SNR in pixel readout circuits. Use Value: Achieves 30 µV_RMS noise floor-directly reducing fixed-pattern noise and enabling higher dynamic range imaging.	Use Scenario: Supplies 2.7 V reference voltage to Bluetooth audio codec IC in true wireless stereo (TWS) earbuds. IC Role / Device Role / Timing Role: High-PSRR LDO isolating audio DAC from noisy DC-DC converter supplying the Bluetooth radio. Use Value: Improves THD+N by >15 dB versus standard LDOs, eliminating audible switching artifacts in high-fidelity playback.

Smartphone Baseband Power

Wearable Sensor Hub Supply

Use Scenario: Powers 2.7 V I/O interface of cellular modem baseband processor during active data transmission.

IC Role / Device Role / Timing Role: Primary LDO delivering clean, sequenced 2.7 V rail with fast start-up and auto-discharge for modem sleep/wake cycles.

Use Value: Enables <150 µs wake-up latency and eliminates residual charge on shared bus lines-reducing inter-rail coupling and improving RF isolation.

Use Scenario: Supplies 2.7 V to MEMS accelerometer/gyroscope cluster in fitness tracker with intermittent motion sensing.

IC Role / Device Role / Timing Role: Low-quiescent-current (0.1 µA) LDO providing regulated voltage only during sensor sampling bursts.

Use Value: Extends battery life by minimizing standby leakage while maintaining rapid response to motion-triggered wake events.

Digital Camera Image Sensor Bias

Bluetooth Audio Codec Reference

Use Scenario: Provides ultra-low-noise 2.7 V bias for CMOS image sensor analog front-end in compact digital still cameras.

IC Role / Device Role / Timing Role: Low-noise LDO rejecting power supply ripple to preserve SNR in pixel readout circuits.

Use Value: Achieves 30 µV_RMS noise floor-directly reducing fixed-pattern noise and enabling higher dynamic range imaging.

Use Scenario: Supplies 2.7 V reference voltage to Bluetooth audio codec IC in true wireless stereo (TWS) earbuds.

IC Role / Device Role / Timing Role: High-PSRR LDO isolating audio DAC from noisy DC-DC converter supplying the Bluetooth radio.

Use Value: Improves THD+N by >15 dB versus standard LDOs, eliminating audible switching artifacts in high-fidelity playback.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6219B272MR-G	2.7 V fixed, 150 mA, 65 mV dropout at 150 mA; no auto-discharge; SOT-25 package (2.9 mm × 2.8 mm).	Lacks pull-down function-requires external discharge circuit for sequencing; larger footprint limits use in ultra-compact designs.	Select when board area permits larger package and auto-discharge is not required for system-level power sequencing.
Ricoh RP111N271B-TR-F	2.7 V fixed, 150 mA, 40 mV dropout at 150 mA; 25 µV_RMS noise; no auto-discharge; DFN1006-4 package (1.0 mm × 1.0 mm).	Lower noise but no integrated pull-down; requires external MOSFET for discharge; slightly larger than WLCSP4.	Prefer when lowest possible noise is critical and external discharge can be accommodated in layout.

Compared with XC6219B272MR-G and RP111N271B-TR-F, LD6816CX4/C27P,315 uniquely combines ultra-low dropout (45 mV), low noise (30 µV_RMS), and integrated auto-discharge in the smallest available footprint-making it optimal for miniaturized, multi-rail portable electronics requiring precise power sequencing and minimal board area.

Availability

LD6816CX4/C27P,315 is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hub supply, digital camera image sensor bias, and Bluetooth audio codec reference applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LD6816CX4/C27P,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 core expertise in power management, RF, and embedded security.

The LD6816 series was designed specifically for ultra-miniaturized, low-power portable electronics-emphasizing ultra-low dropout, low noise, and integrated auto-discharge to simplify power sequencing in space-constrained, battery-powered devices.

FAQ

What is the nominal output voltage and tolerance of the LD6816CX4/C27P,315?

The LD6816CX4/C27P,315 delivers a fixed 2.7 V output with ±2% tolerance over the full operating temperature range (−40 °C to +85 °C) and load (1 mA to 150 mA). At 25 °C and 1 mA load, output accuracy is tighter at ±0.5%, as confirmed in Table 9 of the NXP datasheet. This precision eliminates need for external trimming in most portable applications.

Does the LD6816CX4/C27P,315 include auto-discharge functionality, and how does it operate?

Yes, the LD6816CX4/C27P,315 includes integrated auto-discharge via a 100 Ω pull-down transistor activated when the EN pin is driven LOW. This discharges the OUT pin to <10% of 2.7 V within ≤300 µs, preventing floating outputs and ensuring clean power-down sequencing-critical for multi-rail systems in smartphones and wearables.

What are the minimum and maximum input voltage ratings for the LD6816CX4/C27P,315?

The LD6816CX4/C27P,315 operates with a continuous input voltage range of 2.3 V to 5.5 V. Its absolute maximum rating allows transient input up to +6.0 V for durations ≤4 ms, per Table 6. This supports direct connection to single-cell Li-ion (3.0–4.2 V), Li-polymer, or 3.3 V/5 V system rails without additional overvoltage protection.

What output capacitor is required for stable operation of the LD6816CX4/C27P,315?

The LD6816CX4/C27P,315 requires a minimum 0.7 µF external ceramic capacitor at the OUT pin, with 1.0 µF recommended (X7R dielectric, ±30% tolerance). Equivalent Series Resistance (ESR) must be between 5 mΩ and 500 mΩ. This ensures stability, controls startup/shutdown transients, and maintains PSRR performance across frequency.

How does the thermal performance of the LD6816CX4/C27P,315 compare to other WLCSP LDOs?

The LD6816CX4/C27P,315 has a typical junction-to-ambient thermal resistance (R_th(j-a)) of 130 K/W under standard two-layer PCB conditions. Its WLCSP4 package with backside coating improves heat spreading versus standard WLCSP-enabling reliable 150 mA operation up to +85 °C ambient when GND and IN pins connect to large copper areas and vias.

LD6816CX4/C27P,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):: 2.7V

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/C27P,315 FAQ

1.How can I place an order for LD6816CX4/C27P,315 through Aetrix?

Please submit a Request for Quotation (RFQ) for LD6816CX4/C27P,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/C27P,315 reliable?

The price and inventory of LD6816CX4/C27P,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/C27P,315 is usually 5 days.

3.What payment methods are accepted for LD6816CX4/C27P,315?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/C27P,315 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD6816CX4/C27P,315?

LD6816CX4/C27P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD6816CX4/C27P,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/C27P,315?

For technical support, including LD6816CX4/C27P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/C27P,315 requirements.

6.How does Aetrix verify that LD6816CX4/C27P,315 is sourced from the original manufacturer or authorized distributors?

All LD6816CX4/C27P,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/C27P,315 meets industry standards.

7.What is the process for return or replacement of LD6816CX4/C27P,315?

All LD6816CX4/C27P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/C27P,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/C27P,315 part is unused and in its original packaging.

Return procedure for LD6816CX4/C27P,315:

1.Submit a request within 90 days.

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

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