My Inquiry
My Account
NXP Semiconductors LD6816CX4/33P,315
- Part No.:
- LD6816CX4/33P,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
LD6816CX4/33P,315.pdf
- Description:
- IC REG LINEAR 3.3V 150MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,391
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LD6816CX4/33P,315 from NXP Semiconductors is a 3.3 V fixed-output, 150 mA ultra-low-dropout linear regulator in WLCSP4 package with auto-discharge (pull-down) functionality. It delivers 45 mV dropout at full load, 30 µVRMS output noise (10 Hz–100 kHz), and 55 dB PSRR at 1 kHz-optimized for power-sensitive mobile interfaces in smartphones and portable media players.
For engineers reviewing the LD6816CX4/33P,315 datasheet, LD6816CX4/33P,315 pinout, LD6816CX4/33P,315 application, or LD6816CX4/33P,315 equivalent, key selection criteria include its 0.76 mm × 0.76 mm WLCSP footprint, active-HIGH enable input, guaranteed 3.3 V ±2% output accuracy over −40 °C to +85 °C, and integrated thermal/overcurrent protection.
Technical Context
The LD6816CX4/33P,315 employs a PMOS pass transistor architecture enabling ultra-low dropout voltage and stable operation with only 1.0 µF ceramic output capacitance. Its internal reference generator and feedback network ensure tight output regulation across line (±0.1 %/V) and load (0.0025 %/mA) variations.
Unlike high-ohmic disable variants (e.g., /xxH), this /xxP version integrates a dedicated pull-down transistor (Rpd = 100 Ω typical) that actively discharges the output during shutdown-critical for systems requiring rapid rail collapse and leakage control in battery-powered standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% over −40 °C to +85 °C; enables direct replacement of standard 3.3 V logic rails without external resistors. |
| Dropout Voltage | 45 mV typical at 150 mA; allows operation with VIN as low as 3.345 V, extending battery runtime in single-cell Li-ion or Li-poly systems. |
| PSRR | 55 dB at 1 kHz; suppresses switching noise from upstream DC-DC converters feeding sensitive analog or RF circuitry. |
| Output Noise | 30 µVRMS (10 Hz–100 kHz); supports low-noise analog sensors, ADC references, and RF front-end biasing without added filtering. |
| Enable Threshold | VIH = 1.1 V min, VIL = 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 quiescent power in deep-sleep states for multi-day battery life in IoT endpoints. |
| Start-up Time | <150 µs to 95% of 3.3 V; meets fast wake-up timing requirements in responsive user-interface subsystems. |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP4), 0.4 mm pitch, 0.76 mm × 0.76 mm × 0.47 mm body size with solder bumps on bottom surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (A1) | Supply ground reference | Primary return path for regulator current; must connect to solid PCB ground plane for thermal and noise performance. |
| 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 3.3 V to load; includes internal pull-down transistor (100 Ω typ.) for rapid discharge when disabled. |
| IN (B2) | Input voltage supply | Accepts 2.3 V to 5.5 V; requires local 1.0 µF X7R ceramic capacitor placed within 2 mm of pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor ensures controlled output discharge during shutdown-eliminates need for external bleeder resistors in space-constrained designs. |
| Ultra-low noise output | 30 µVRMS noise floor enables clean power for precision analog circuits without additional LDO post-regulation stages. |
| High PSRR at low frequency | 55 dB rejection at 1 kHz mitigates ripple from buck converter switching frequencies and their harmonics in mixed-signal SoC power domains. |
| Thermal & overcurrent protection | Automatic shutdown at 160 °C junction temperature with 20 K hysteresis; current limit prevents damage during short-circuit or overload events. |
| ESD robustness | 10 kV HBM rating protects against handling damage during SMT assembly and field operation in handheld consumer devices. |
Applications
| Smartphone Core Logic Power | Portable Media Player Audio Bias |
|---|---|
Use Scenario: Supplying 3.3 V to application processor I/O banks and memory interfaces in compact smartphone PCBs. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout post-regulator delivering stable voltage from a shared 4.2 V battery or intermediate DC-DC rail. Use Value: Enables reliable high-speed digital signaling with minimal voltage margin loss and no external discharge components required. |
Use Scenario: Powering DACs, headphone amplifiers, and audio codec analog sections in battery-operated media players. IC Role / Device Role / Timing Role: Clean, low-noise 3.3 V bias source decoupled from noisy digital supply domains. Use Value: Reduces audible noise floor by suppressing supply-induced distortion; 30 µVRMS noise meets high-fidelity audio requirements. |
| Digital Still Camera Sensor Interface | Personal Navigation Device GPS Front-End |
Use Scenario: Providing regulated 3.3 V to CMOS image sensor I/O and timing controller in ultra-thin camera modules. IC Role / Device Role / Timing Role: Compact, thermally efficient LDO mounted directly adjacent to sensor die on flex PCB. Use Value: 0.76 mm × 0.76 mm WLCSP footprint minimizes board area; 45 mV dropout preserves headroom for battery voltage sag during flash operation. |
Use Scenario: Supplying 3.3 V to GPS/GNSS RF front-end ICs and low-noise amplifiers in handheld navigation units. IC Role / Device Role / Timing Role: Low-PSRR-sensitive LDO isolating RF circuitry from noisy system power rails. Use Value: 55 dB PSRR at 1 kHz rejects switching noise from PMU DC-DC converters, improving GPS signal acquisition sensitivity and time-to-first-fix. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B332MR-G | 3.3 V fixed, 150 mA, 65 mV dropout (typ.), 45 µVRMS noise, SOT-25 package (2.9 mm × 2.8 mm) | Larger footprint; no auto-discharge; higher dropout limits use in low-VIN scenarios | Select when board space permits larger package and auto-discharge is not required. |
| Richtek RT9013-33GB | 3.3 V fixed, 250 mA, 250 mV dropout (typ.), 40 µVRMS noise, DFN-6 (2.0 mm × 2.0 mm) | Higher current capability but significantly higher dropout and noise; no integrated pull-down | Choose for higher load current needs where 3.3 V rail stability under transient load is prioritized over ultra-low dropout. |
Compared with XC6219B332MR-G and RT9013-33GB, the LD6816CX4/33P,315 offers the smallest form factor, lowest dropout, lowest noise, and unique auto-discharge-making it optimal for miniaturized, battery-sensitive designs where rapid rail collapse and efficiency are critical.
Availability
LD6816CX4/33P,315 is available at Aetrix Electronics and suitable for smartphone core logic, portable media player audio bias, digital still camera sensor interface, and personal navigation device GPS front-end applications requiring stable component supply and long-term lifecycle support.
Supply support for LD6816CX4/33P,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 markets.
The LD6816 series was designed specifically for ultra-compact, low-power portable devices-delivering high-performance LDO regulation in wafer-level chip-scale packaging to meet aggressive miniaturization goals in mobile appliances.
FAQ
What is the output voltage tolerance of the LD6816CX4/33P,315 over temperature?
The LD6816CX4/33P,315 guarantees ±2% output voltage accuracy over the full operating ambient temperature range of −40 °C to +85 °C at 1 mA load. At +25 °C, the tolerance tightens to ±0.5%, ensuring precise 3.3 V regulation for logic and analog circuits requiring stable reference levels. This specification is confirmed in Table 9 of the NXP datasheet Rev. 1.
Does the LD6816CX4/33P,315 require an external output capacitor, and what type is recommended?
Yes, the LD6816CX4/33P,315 requires a minimum 0.7 µF external ceramic output capacitor, with 1.0 µF recommended for optimal stability and transient response. NXP specifies X7R dielectric capacitors rated for −40 °C to +125 °C, with ESR between 5 mΩ and 500 mΩ. The capacitor must be placed within 2 mm of the OUT and GND pins to maintain loop stability and minimize noise coupling.
How does the auto-discharge function of the LD6816CX4/33P,315 operate during shutdown?
When the EN pin is driven LOW, the LD6816CX4/33P,315 activates an internal 100 Ω (typical) pull-down transistor between OUT and GND, rapidly discharging the output capacitance. Shutdown time to 10% of nominal voltage is typically 300 µs with a 1.0 µF load. This eliminates reliance on external bleed resistors and ensures predictable power-rail collapse for system-level sequencing and leakage control.
What is the maximum input voltage rating for the LD6816CX4/33P,315, and what happens beyond that limit?
The absolute maximum input voltage for the LD6816CX4/33P,315 is +6.0 V for transients up to 4 ms, per Table 6 of the datasheet. Continuous operation above 5.5 V violates recommended conditions and risks permanent damage. Exceeding +6.0 V-even briefly-may trigger irreversible latch-up or junction breakdown due to internal ESD protection diode conduction, potentially degrading or destroying the LD6816CX4/33P,315.
Is the LD6816CX4/33P,315 RoHS-compliant and halogen-free?
Yes, the LD6816CX4/33P,315 is fully RoHS-compliant and halogen-free, meeting NXP's "dark green" compliance standard. It contains no lead, bromine, chlorine, antimony, or other restricted substances per EU Directive 2011/65/EU and IEC 61249-2-21. This is explicitly stated in Section 1.2 of the product data sheet and verified in the manufacturer's material declarations.
LD6816CX4/33P,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 4-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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)
LD6816CX4/33P,315 FAQ
1.How can I place an order for LD6816CX4/33P,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/33P,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 LD6816CX4/33P,315 reliable?
The price and inventory of LD6816CX4/33P,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6816CX4/33P,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/33P,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/33P,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/33P,315?
LD6816CX4/33P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/33P,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 LD6816CX4/33P,315?
For technical support, including LD6816CX4/33P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/33P,315 requirements.
6.How does Aetrix verify that LD6816CX4/33P,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/33P,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 LD6816CX4/33P,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/33P,315?
All LD6816CX4/33P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/33P,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 LD6816CX4/33P,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/33P,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD6816CX4/33P,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…
