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NXP Semiconductors LD6816CX4/C16P,315
- Part No.:
- LD6816CX4/C16P,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-UFBGA, WLCSP
- Datasheet:
-
LD6816CX4/C16P,315.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:27,000
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Product details
Overview
LD6816CX4/C16P,315 from NXP Semiconductors is a 1.6 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 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 low-voltage analog/digital circuitry in space-constrained portable devices.
For engineers reviewing the LD6816CX4/C16P,315 datasheet, LD6816CX4/C16P,315 pinout, LD6816CX4/C16P,315 application, or LD6816CX4/C16P,315 equivalent, this page provides verified technical context, validated pin functions, confirmed LDO performance metrics (dropout, PSRR, startup time), and real-world use cases in mobile interface power domains requiring sub-2 V supply rails and fast enable/disable response.
Technical Context
The LD6816CX4/C16P,315 implements a PMOS pass transistor architecture enabling ultra-low dropout (45 mV @ 150 mA) and high PSRR (−55 dB @ 1 kHz). Its internal bandgap reference, error amplifier, and thermal/overcurrent protection circuits operate across −40 °C to +85 °C ambient, with shutdown quiescent current of 0.1 µA typical.
Unlike high-ohmic disable variants (e.g., /xxH), this /CxxP suffix denotes backside-coated WLCSP4 with integrated pull-down switch (Rpd = 100 Ω typical), ensuring rapid output discharge (<300 µs shutdown time) during system sleep transitions-critical for battery-powered devices requiring zero standby leakage paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.6 V ±3% over −40 °C to +85 °C; enables direct powering of 1.6 V I/O domains without external feedback. |
| Dropout voltage | 45 mV typical at 150 mA; allows operation with VIN as low as 1.645 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/analog blocks. |
| Output noise | 30 µVRMS (10 Hz–100 kHz); meets low-noise requirements for ADC references and precision sensor signal chains. |
| Startup time | <150 µs to 95% of 1.6 V; supports fast wake-up sequences in always-on subsystems like touch controllers or PMIC sequencers. |
| Shutdown current | 0.1 µA typical; reduces system standby power by >99% versus active mode (155 µA), extending shelf life in IoT edge nodes. |
| Enable threshold | VIH = 1.1 V min, VIL = 0.4 V max; compatible with 1.8 V GPIO logic without level-shifting, simplifying host MCU interface. |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP4) with backside coating; dimensions 0.76 mm × 0.76 mm × 0.47 mm; 0.4 mm bump pitch; Pb-free, RoHS-compliant, halogen-free.
| 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 Rth(j-a) (130 K/W typical). |
| EN (A2) | Active-HIGH enable input | Controls LDO state; drives high (>1.1 V) to activate regulation, low (<0.4 V) to enter auto-discharge shutdown mode. |
| OUT (B1) | Regulated output voltage | Delivers 1.6 V to load; includes integrated 100 Ω pull-down transistor for rapid discharge when EN is low. |
| IN (B2) | Input voltage supply | Accepts 2.3–5.5 V; requires ≥0.7 µF X7R ceramic capacitor (1 µF recommended) with ESR 5–500 mΩ for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor discharges OUT to <10% of 1.6 V within 300 µs after EN deactivation-eliminates need for external bleed resistors in battery-critical designs. |
| Ultra-low noise regulation | 30 µVRMS output noise enables clean power for noise-sensitive analog circuits (e.g., audio codecs, RF front-ends) without additional filtering. |
| High PSRR at low frequency | −55 dB rejection at 1 kHz suppresses ripple from noisy DC-DC sources, preserving signal integrity in mixed-signal SoC power domains. |
| Thermal and current protection | Over-temperature shutdown at 160 °C with 20 K hysteresis and current limiting prevent damage during overload or poor PCB thermal design. |
| Miniaturized WLCSP4 footprint | 0.76 mm × 0.76 mm area occupies <10% of typical SOT-23-5 area-enables placement directly under BGA packages or in tight camera module layouts. |
Applications
| Smartphone Application Processor I/O Supply | Digital Camera Image Sensor Bias |
|---|---|
|
Use Scenario: Powering 1.6 V I/O banks of application processors during active and deep-sleep states in LTE smartphones. IC Role / Device Role / Timing Role: Low-noise, fast-response LDO delivering regulated 1.6 V rail synchronized to processor enable signals. Use Value: Auto-discharge prevents floating I/O lines during suspend, eliminating latch-up risk and reducing system-level ESD susceptibility. |
Use Scenario: Providing clean bias voltage to CMOS image sensor analog front-end circuits in compact digital still cameras. IC Role / Device Role / Timing Role: Ultra-low-noise (30 µVRMS) regulator stabilizing sensor reference voltage during exposure and readout phases. Use Value: Maintains SNR >70 dB by suppressing power-supply-induced pattern noise, critical for low-light image quality. |
| Portable Media Player Audio Codec | Personal Navigation Device GPS Front-End |
|
Use Scenario: Supplying 1.6 V analog core voltage to stereo audio codecs in battery-powered media players. IC Role / Device Role / Timing Role: Low-dropout (45 mV) regulator sustaining output during battery voltage sag below 2.0 V. Use Value: Extends playback time by 12–15 minutes per charge cycle compared to higher-dropout alternatives in single-cell Li-ion systems. |
Use Scenario: Powering GPS RF front-end LNA and mixer stages in handheld navigation devices with aggressive size constraints. IC Role / Device Role / Timing Role: High-PSRR (−55 dB @ 1 kHz) LDO rejecting switching noise from adjacent PMIC DC-DC converters. Use Value: Improves GPS sensitivity by 2.5 dB, enabling faster TTFF (Time-To-First-Fix) in urban canyon environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0516PDBVR | 1.6 V fixed, 200 mA, 170 mV dropout @ 200 mA, SOT-23-5 package (2.9 mm × 1.6 mm) | Larger footprint; no auto-discharge; higher quiescent current (2.5 µA typical in shutdown) | Select when board space permits larger package and auto-discharge is not required for system-level power sequencing. |
| MCP1700T-1602E/TT | 1.6 V fixed, 250 mA, 600 mV dropout @ 250 mA, SOT-23-3 package; no enable pin or auto-discharge | No EN control; higher dropout limits usable input range; lacks thermal/current protection | Choose only for cost-sensitive, non-battery applications where input voltage remains >2.2 V and fast shutdown is unnecessary. |
Compared with TPS7A0516PDBVR and MCP1700T-1602E/TT, LD6816CX4/C16P,315 offers superior miniaturization (0.58 mm² vs. 4.64 mm²/2.32 mm²), lower dropout (45 mV vs. 170/600 mV), and integrated auto-discharge-making it uniquely suited for space- and battery-life-constrained portable electronics.
Availability
LD6816CX4/C16P,315 is available at Aetrix Electronics and suitable for smartphone application processor I/O supplies, digital camera image sensor bias, portable media player audio codecs, and personal navigation device GPS front-ends requiring stable component supply with guaranteed long-term availability.
Supply support for LD6816CX4/C16P,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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.
The LD6816 series was designed specifically for ultra-miniaturized, low-noise power delivery in portable consumer electronics-emphasizing wafer-level packaging, sub-50 mV dropout, and integrated discharge functionality to meet stringent battery life and form factor requirements.
FAQ
What is the nominal output voltage of the LD6816CX4/C16P,315?
The LD6816CX4/C16P,315 delivers a fixed 1.6 V output voltage with ±3% tolerance over −40 °C to +85 °C ambient temperature and 1 mA to 150 mA load current. This value is factory-trimmed and does not require external feedback components, simplifying design for 1.6 V I/O domains in portable SoCs.
Does the LD6816CX4/C16P,315 include auto-discharge functionality?
Yes, the LD6816CX4/C16P,315 integrates a 100 Ω pull-down transistor that actively discharges the OUT pin to <10% of 1.6 V within 300 µs after EN is driven low. This /CxxP suffix explicitly denotes backside-coated WLCSP4 with auto-discharge-confirmed in Table 5 and Figure 3 of the datasheet.
What is the minimum external output capacitance required for stable operation of the LD6816CX4/C16P,315?
The LD6816CX4/C16P,315 requires a minimum 0.7 µF X7R ceramic capacitor at the OUT pin, with recommended value of 1.0 µF and ESR between 5 mΩ and 500 mΩ. This ensures loop stability and controls shutdown time per Table 10 and Section 10.1 of the datasheet.
How does the LD6816CX4/C16P,315 compare to /xxH variants in disable behavior?
Unlike /xxH variants (e.g., LD6816CX4/16H) which enter high-ohmic (3-state) output during disable, the LD6816CX4/C16P,315 enters low-ohmic state via its integrated pull-down transistor. This difference is explicitly defined in Section 1.1 and Figure 3, making /CxxP variants mandatory for applications requiring active output discharge.
What is the thermal resistance (Rth(j-a)) specification for the LD6816CX4/C16P,315?
The LD6816CX4/C16P,315 has a typical junction-to-ambient thermal resistance of 130 K/W under standard test conditions (Tamb = 25 °C, two-layer PCB). Actual performance depends on PCB layout-solid copper connections to GND/IN pins and multi-layer heat-spreading vias are required to approach this value per Section 7 of the datasheet.
LD6816CX4/C16P,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):
- 1.6V
- 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/C16P,315 FAQ
1.How can I place an order for LD6816CX4/C16P,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/C16P,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/C16P,315 reliable?
The price and inventory of LD6816CX4/C16P,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/C16P,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/C16P,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/C16P,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/C16P,315?
LD6816CX4/C16P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/C16P,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/C16P,315?
For technical support, including LD6816CX4/C16P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/C16P,315 requirements.
6.How does Aetrix verify that LD6816CX4/C16P,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/C16P,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/C16P,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/C16P,315?
All LD6816CX4/C16P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/C16P,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/C16P,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/C16P,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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