NXP Semiconductors LD6806CX4/18P,315

Overview

LD6806CX4/18P,315 from NXP Semiconductors is a 1.8 V, 200 mA ultra-low-dropout linear regulator in a 0.76 mm × 0.76 mm WLCSP4 package with 60 mV dropout at full load, 30 µV_RMS output noise (10 Hz–100 kHz), and active-HIGH enable control. It features low-ohmic pull-down during disable, thermal shutdown, overcurrent protection, and is optimized for space-constrained mobile power rails including baseband processors and RF transceivers in smartphones.

For engineers reviewing the LD6806CX4/18P,315 datasheet, LD6806CX4/18P,315 pinout, LD6806CX4/18P,315 application, or LD6806CX4/18P,315 equivalent, key selection criteria include its 1.8 V fixed output, 2.3–5.5 V input range, 200 µs startup time, 55 dB PSRR at 1 kHz, and WLCSP4 footprint compatibility with high-density PCB layouts.

Technical Context

The LD6806CX4/18P,315 uses a PMOS pass transistor architecture enabling 60 mV dropout at 200 mA, supporting operation down to VIN = VOUT + 0.06 V. Its internal voltage reference and error amplifier deliver ±0.5% output accuracy at 25 °C and ±3% over −40 °C to +85 °C ambient.

It integrates a dedicated pull-down switch (R_pd = 100 Ω typical) on the OUT pin when disabled (VEN ≤ 0.4 V), ensuring rapid discharge of downstream capacitance. Thermal protection triggers at 160 °C with 20 K hysteresis, and ESD robustness meets 10 kV HBM.

Key Specifications

Pinout & Package

LD6806CX4/18P,315 is housed in a wafer-level chip-scale package (WLCSP4) measuring 0.76 mm × 0.76 mm × 0.47 mm with 0.4 mm pitch solder bumps. The package has no leads and requires reflow soldering only - wave soldering is not supported.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B182MR-G and RT9013-18GB, LD6806CX4/18P,315 delivers superior miniaturization (0.58 mm² vs ≥8.1 mm²), lowest dropout (60 mV), and fastest startup (200 µs), making it optimal for next-generation mobile and wearable platforms where board space and efficiency are constrained.

Availability

LD6806CX4/18P,315 is available at Aetrix Electronics and suitable for mobile handset power management, RF transceiver biasing, and wearable sensor hub applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LD6806CX4/18P,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 mobile markets.

The LD6806 series was designed specifically for ultra-miniaturized, low-noise power regulation in portable electronics - targeting space-constrained applications such as smartphones, wearables, and IoT edge nodes where WLCSP integration and fast enable response are critical.

FAQ

What is the nominal output voltage and tolerance of LD6806CX4/18P,315?

The LD6806CX4/18P,315 provides a fixed 1.8 V output with ±2% initial accuracy at 25 °C and ±3% total variation across −40 °C to +85 °C ambient temperature and 1–200 mA load range. This specification is guaranteed per NXP's Product Data Sheet Rev. 3 (2011), Table 10.

Does LD6806CX4/18P,315 require an external output capacitor, and what are the requirements?

Yes, LD6806CX4/18P,315 requires a minimum 1.0 µF ceramic output capacitor with ESR between 5 mΩ and 500 mΩ, as specified in Table 11 and Section 10.1 of the datasheet. X7R dielectric is recommended to maintain stability across −40 °C to +125 °C. Capacitor value directly affects shutdown time (t_sd(reg)).

How does the enable function operate on LD6806CX4/18P,315?

The LD6806CX4/18P,315 uses an active-HIGH enable input (EN pin A2). The device turns on when V_EN ≥ 1.4 V and shuts down when V_EN ≤ 0.4 V. During shutdown, the integrated 100 Ω pull-down switch actively discharges the output node - a feature distinguishing the "P" variant from the "H" (high-ohmic) version.

What thermal protection features does LD6806CX4/18P,315 include?

LD6806CX4/18P,315 incorporates thermal shutdown that activates at 160 °C junction temperature (T_sd) with 20 K hysteresis (T_sd(hys)). Once triggered, the regulator disables and remains off until junction temperature falls below 140 °C. This behavior is confirmed in Table 10 and Figure 4 block diagram.

Is LD6806CX4/18P,315 compatible with lead-free reflow processes?

Yes, LD6806CX4/18P,315 is Pb-free and RoHS compliant. Its WLCSP4 package is qualified for lead-free reflow per J-STD-020C, with peak temperature classification of 260 °C for packages <1.6 mm thick (A = 0.47 mm typ). Wave soldering is explicitly prohibited per Section 14.