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NXP Semiconductors LD6816CX4/16P,315
- Part No.:
- LD6816CX4/16P,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
LD6816CX4/16P,315.pdf
- Description:
- IC REG LINEAR 1.6V 150MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:36,000
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Product details
Overview
LD6816CX4/16P,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), featuring 45 mV dropout at full load, 30 µVRMS output noise (10 Hz–100 kHz), and integrated auto-discharge pull-down transistor for low-ohmic output during disable-optimized for power rail sequencing in mobile phone handsets and portable media players.
For engineers reviewing the LD6816CX4/16P,315 datasheet, LD6816CX4/16P,315 pinout, LD6816CX4/16P,315 application, or LD6816CX4/16P,315 equivalent, key selection criteria include guaranteed 1.6 V ±2% output accuracy over −40 °C to +85 °C, 55 dB PSRR at 1 kHz, sub-150 µs startup time, and WLCSP-level thermal resistance (Rth(j-a) = 130 K/W) under standard PCB layout.
Technical Context
The LD6816CX4/16P,315 implements a PMOS pass transistor architecture enabling ultra-low dropout (45 mV typ. at 150 mA) and stable operation with only 1.0 µF ceramic output capacitance. Its enable input (VEN) has defined HIGH/LOW thresholds (VIH ≥ 1.1 V, VIL ≤ 0.4 V), independent of VIN, supporting clean power sequencing in multi-rail systems.
Internal protection includes over-temperature shutdown (Tsd = 160 °C, hysteresis = 20 K), current limiting (Isc = 600 mA), and ESD robustness (±10 kV HBM). The integrated pull-down transistor (Rpd = 100 Ω typ.) actively discharges the output during disable, eliminating residual voltage hold-up in battery-powered devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.6 V ±2% over −40 °C to +85 °C - ensures stable core logic supply for low-voltage SoCs without external feedback. |
| Dropout Voltage | 45 mV typical at 150 mA - enables regulation from 1.645 V input, critical for extending battery runtime in single-cell Li-ion systems. |
| PSRR | 55 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding sensitive analog/RF circuitry. |
| Output Noise | 30 µVRMS (10 Hz–100 kHz) - meets low-noise requirements for ADC reference rails and RF LNA biasing. |
| Quiescent Current | 0.1 µA typical in shutdown (VEN ≤ 0.4 V) - minimizes battery drain in always-on standby modes. |
| Startup Time | <150 µs to 95% of 1.6 V - supports fast wake-up sequences in mobile applications requiring sub-millisecond response. |
| Pull-down Resistance | 100 Ω typical - ensures rapid discharge of 1 µF output cap in <300 µs, preventing unintended wake-up or latch-up. |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP4), 0.4 mm pitch, 0.76 mm × 0.76 mm × 0.47 mm footprint, solder bumps on underside (A1–B2 configuration).
| 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) | Enable control input | Active-HIGH logic interface; drives internal pass transistor and pull-down switch; VIH ≥ 1.1 V required for reliable turn-on. |
| OUT (B1) | Regulated output voltage | Delivers 1.6 V to load; integrates auto-discharge path to GND when EN is LOW - eliminates need for external bleed resistor. |
| IN (B2) | Input voltage supply | Accepts 2.3 V to 5.5 V; requires local 1 µF ceramic decoupling within 2 mm of pin to ensure stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 45 mV at 150 mA enables operation from near-threshold input voltages, maximizing energy extraction from aging batteries. |
| Integrated auto-discharge | 100 Ω pull-down transistor actively sinks output current during disable, eliminating external components and reducing BOM count. |
| Low-noise regulation | 30 µVRMS noise supports precision analog circuits without additional filtering, reducing system-level EMI design effort. |
| High PSRR at 1 kHz | 55 dB rejection of ripple from switching regulators allows clean LDO output even when powered from noisy DC-DC stages. |
| Robust protection suite | Thermal shutdown (160 °C), current limit (600 mA), and ±10 kV HBM ESD rating ensure field reliability in handheld environments. |
Applications
| Smartphone Core Rail | Portable Media Player Audio Bias |
|---|---|
|
Use Scenario: Powering 1.6 V I/O or low-power logic cores in smartphone application processors during active and sleep states. IC Role / Device Role / Timing Role: Primary LDO delivering stable, low-noise 1.6 V supply with fast enable/disable for dynamic voltage scaling. Use Value: 45 mV dropout extends usable battery range by ~30 minutes in single-cell Li-ion systems; auto-discharge prevents leakage-induced wake-up. |
Use Scenario: Providing clean bias voltage to Class-D audio amplifier inputs and DAC reference circuits in portable media players. IC Role / Device Role / Timing Role: Low-noise post-regulator isolating sensitive analog stages from noisy system rails. Use Value: 30 µVRMS noise and 55 dB PSRR prevent audible hiss and switching artifacts in high-fidelity playback. |
| Digital Still Camera Sensor Interface | Personal Navigation Device GPS Front-End |
|
Use Scenario: Supplying regulated 1.6 V to CMOS image sensor I/O interfaces and timing controllers in compact digital cameras. IC Role / Device Role / Timing Role: Compact, thermally efficient LDO meeting tight board space constraints while maintaining signal integrity. Use Value: WLCSP4 footprint (0.76 mm²) enables placement directly adjacent to sensor die; 130 K/W Rth(j-a) sustains 150 mA load at +85 °C ambient. |
Use Scenario: Powering GPS/GNSS RF front-end LNA and mixer bias rails in battery-operated personal navigation devices. IC Role / Device Role / Timing Role: Ultra-low-noise, fast-startup regulator ensuring rapid GNSS signal acquisition after cold start. Use Value: Sub-150 µs startup time reduces TTFF (Time-To-First-Fix); 0.1 µA shutdown current preserves battery for weeks in standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6216D162MR-G | Same 1.6 V output, 150 mA rating, SOT-25 package (2.9 mm × 2.8 mm); higher dropout (120 mV at 150 mA); no auto-discharge. | Requires external pull-down resistor for output discharge; larger footprint limits use in ultra-compact designs. | Choose when board space permits larger package and auto-discharge is not required. |
| Richtek RT9013-16GB | 1.6 V, 300 mA output; SOT-23-5 package; 250 mV dropout at 300 mA; 45 µVRMS noise; no integrated pull-down. | Higher current capability but higher noise and dropout; lacks auto-discharge function entirely. | Choose when higher load current is needed and external discharge circuitry is acceptable. |
Compared with XC6216D162MR-G and RT9013-16GB, the LD6816CX4/16P,315 uniquely combines ultra-low dropout (45 mV), integrated auto-discharge, and WLCSP miniaturization-making it optimal for space-constrained, battery-sensitive portable systems where output rail control and efficiency are co-critical.
Availability
LD6816CX4/16P,315 is available at Aetrix Electronics and suitable for smartphone handsets, portable media players, and digital still cameras requiring stable component supply with guaranteed long-term availability and RoHS-compliant manufacturing.
Supply support for LD6816CX4/16P,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, battery-powered portable electronics-emphasizing ultra-low dropout, low noise, and integrated power-control features like auto-discharge to reduce system-level complexity.
FAQ
What is the output voltage tolerance of LD6816CX4/16P,315 across temperature and load?
The LD6816CX4/16P,315 delivers 1.6 V with ±2% tolerance over −40 °C to +85 °C ambient and 1 mA to 150 mA load current, as verified in Table 9 of the NXP datasheet. This accuracy holds without external trimming, making LD6816CX4/16P,315 suitable for direct powering of 1.6 V logic interfaces without margin overhead.
Does LD6816CX4/16P,315 require an external pull-down resistor for output discharge?
No. LD6816CX4/16P,315 integrates a dedicated pull-down transistor (Rpd = 100 Ω typ.) that actively discharges the output to GND when EN is LOW. This eliminates the need for external bleed resistors, saving PCB area and reducing BOM cost-unlike most competing LDOs such as RT9013-16GB or XC6216D162MR-G.
What is the minimum recommended output capacitor for stable operation of LD6816CX4/16P,315?
The LD6816CX4/16P,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 stability across temperature and load, and directly affects shutdown time-critical for proper power sequencing in portable devices using LD6816CX4/16P,315.
How does the PSRR of LD6816CX4/16P,315 compare at different load currents?
LD6816CX4/16P,315 maintains 55 dB PSRR at 1 kHz across 1 mA to 150 mA loads, as specified in Table 9. Unlike many LDOs whose PSRR degrades significantly with increasing current, LD6816CX4/16P,315 sustains high rejection-enabling clean 1.6 V rails even when driving dynamic digital loads alongside analog circuitry.
Is LD6816CX4/16P,315 compatible with lead-free reflow soldering processes?
Yes. LD6816CX4/16P,315 is qualified for lead-free reflow per J-STD-020C, with peak temperature rating of 260 °C (Table 18). Its WLCSP4 package (volume < 350 mm³, thickness < 1.6 mm) falls in the lowest thermal class, allowing reliable assembly using standard Pb-free profiles without risk of delamination or bump fracture.
LD6816CX4/16P,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):
- 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)
LD6816CX4/16P,315 FAQ
1.How can I place an order for LD6816CX4/16P,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6816CX4/16P,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 LD6816CX4/16P,315 reliable?
The price and inventory of LD6816CX4/16P,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6816CX4/16P,315 is usually 5 days.
3.What payment methods are accepted for LD6816CX4/16P,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6816CX4/16P,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6816CX4/16P,315?
LD6816CX4/16P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6816CX4/16P,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 LD6816CX4/16P,315?
For technical support, including LD6816CX4/16P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6816CX4/16P,315 requirements.
6.How does Aetrix verify that LD6816CX4/16P,315 is sourced from the original manufacturer or authorized distributors?
All LD6816CX4/16P,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 LD6816CX4/16P,315 meets industry standards.
7.What is the process for return or replacement of LD6816CX4/16P,315?
All LD6816CX4/16P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6816CX4/16P,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 LD6816CX4/16P,315 part is unused and in its original packaging.
Return procedure for LD6816CX4/16P,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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