NXP Semiconductors LD6806CX4/18H,315

Overview

LD6806CX4/18H,315 from NXP Semiconductors is a 1.8 V, 200 mA ultra-low-dropout linear regulator in WLCSP4 package (0.76 mm × 0.76 mm × 0.47 mm), featuring 60 mV dropout at 200 mA, 30 µV_RMS output noise (10 Hz–100 kHz), and high-ohmic (3-state) output during disable. It operates from 2.3 V to 5.5 V input and targets power-sensitive mobile handset and media player subsystems requiring stable low-noise bias.

For engineers reviewing the LD6806CX4/18H,315 datasheet, LD6806CX4/18H,315 pinout, LD6806CX4/18H,315 application, or LD6806CX4/18H,315 equivalent, key selection criteria include its 1.8 V fixed output, thermal shutdown (160 °C), ±0.5 % output voltage accuracy at +25 °C, 55 dB PSRR at 1 kHz, and enable threshold (V_IH = 1.4 V, V_IL = 0.4 V).

Technical Context

The LD6806CX4/18H,315 implements a monolithic silicon LDO architecture with internal reference generator, current-limit protection, and thermal watchdog circuitry. Its pass transistor operates in linear mode with minimal V_IN–V_OUT differential, enabling efficient regulation even under tight input headroom constraints typical in battery-powered portable systems.

As a high-ohmic output variant (denoted by 'H'), it disconnects the output via an open-circuit state when disabled-critical for preventing back-powering of downstream circuits. The device integrates ESD protection rated at ±10 kV HBM and supports stable operation with only 1.0 µF ceramic output capacitance.

Key Specifications

Pinout & Package

LD6806CX4/18H,315 uses a wafer-level chip-scale package (WLCSP4) with 0.4 mm pitch, 2×2 bump array, and dimensions 0.76 mm × 0.76 mm × 0.47 mm. It is Pb-free, RoHS-compliant, and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P182MR-G and RT9013-18GB, LD6806CX4/18H,315 delivers superior miniaturization (0.76 mm² vs. ~2.9 mm²), lowest dropout (60 mV), and lowest noise (30 µV_RMS) - making it optimal for space-constrained, battery-operated portable devices demanding high PSRR and fast transient response.

Availability

LD6806CX4/18H,315 is available at Aetrix Electronics and suitable for mobile phone handsets, wireless headsets, portable media players, and smart wearable devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LD6806CX4/18H,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 LD6806 series belongs to NXP's ultra-low-noise, miniaturized LDO product line, engineered specifically for power integrity in space-constrained portable electronics where low dropout, fast enable, and high PSRR are critical.

FAQ

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

The LD6806CX4/18H,315 provides a fixed 1.8 V nominal output voltage with ±0.5 % accuracy at +25 °C and ±3 % over the full operating temperature range (−30 °C to +85 °C). This tight tolerance ensures reliable operation of 1.8 V logic and analog circuitry without external feedback adjustment.

Does the LD6806CX4/18H,315 require an external output capacitor, and what value is recommended?

Yes, the LD6806CX4/18H,315 requires an external ceramic output capacitor for stability. The datasheet specifies a minimum of 1.0 µF (X7R dielectric, ±30 % tolerance), with recommended ESR between 5 mΩ and 500 mΩ. Using this value ensures proper transient response, loop stability, and compliance with the 200 µs start-up time specification.

What is the dropout voltage of the LD6806CX4/18H,315 at full load, and how does it impact system efficiency?

The LD6806CX4/18H,315 exhibits a typical dropout voltage of 60 mV at 200 mA load. This low value allows the device to maintain regulation down to an input voltage of 1.86 V, maximizing usable battery capacity in single-cell Li-ion systems and improving overall power efficiency compared to standard LDOs with >200 mV dropout.

How does the high-ohmic output state of the LD6806CX4/18H,315 function during disable, and why is it beneficial?

When disabled via the EN pin (<0.4 V), the LD6806CX4/18H,315 places its OUT pin in a high-impedance (3-state) condition - effectively disconnecting the output from the internal pass element. This prevents back-powering of upstream sources or leakage into powered-down subsystems, which is essential for safe hot-swap operation and power domain isolation in multi-rail portable designs.

What thermal protection features are integrated into the LD6806CX4/18H,315?

The LD6806CX4/18H,315 incorporates thermal shutdown with a trigger point of 160 °C and 20 K hysteresis (T_sd(hys)). Once tripped, the device disables regulation and holds OFF until junction temperature falls below 140 °C. This safeguard prevents permanent damage during sustained overload, poor PCB heatsinking, or ambient temperature excursions - critical for sealed wearable enclosures.