NXP Semiconductors LD6806CX4/36H,315

Overview

LD6806CX4/36H,315 from NXP Semiconductors is a 3.6 V, 200 mA ultra-low-dropout linear regulator in WLCSP4 package (0.76 mm × 0.76 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 subsystems requiring stable low-noise bias.

For engineers reviewing the LD6806CX4/36H,315 datasheet, LD6806CX4/36H,315 pinout, LD6806CX4/36H,315 application, or LD6806CX4/36H,315 equivalent, key selection criteria include its 3.6 V fixed output, thermal shutdown (160 °C), enable threshold (VIH = 1.4 V), PSRR of −55 dB at 1 kHz, and compatibility with 1 µF X7R ceramic output capacitors.

Technical Context

The LD6806CX4/36H,315 uses a monolithic silicon LDO architecture with internal voltage reference, error amplifier, and PMOS pass transistor. Its high-ohmic output state during disable (EN = LOW) isolates downstream circuitry without pull-down leakage, distinguishing it from P-suffix variants with integrated 100 Ω pull-down.

It integrates thermal protection (160 °C shutdown with 20 K hysteresis), overcurrent limiting, and 10 kV HBM ESD protection. The regulator maintains stability with ≥1.0 µF output capacitance and exhibits load regulation error of ≤0.01 %/mA (WLCSP variant) across 1–200 mA.

Key Specifications

Pinout & Package

LD6806CX4/36H,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 LD6806F/36H and LD6806TD/36H, the LD6806CX4/36H,315 delivers the lowest profile and best thermal performance in space-constrained mobile applications, but requires advanced reflow processes and offers no leaded alternative for prototyping or repair.

Availability

LD6806CX4/36H,315 is available at Aetrix Electronics and suitable for mobile handset power management, wearable sensor hubs, and portable media player displays requiring stable component supply with guaranteed long-term availability.

Supply support for LD6806CX4/36H,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 was designed specifically for miniaturized portable electronics, emphasizing ultra-low dropout, low noise, and high integration in sub-1 mm² packages to meet stringent size and power constraints in mobile handsets and wearables.

FAQ

What is the nominal output voltage of the LD6806CX4/36H,315?

The LD6806CX4/36H,315 provides a fixed nominal output voltage of 3.6 V, with guaranteed tolerance of ±2 % over the full operating temperature range (−40 °C to +85 °C ambient). This value is factory-trimmed and does not require external resistors, making LD6806CX4/36H,315 ideal for applications needing a precise, stable 3.6 V rail without design overhead.

Does the LD6806CX4/36H,315 support enable control, and what are its logic thresholds?

Yes, the LD6806CX4/36H,315 features an active-HIGH enable input (EN) on bump A2. It asserts regulation when EN ≥ 1.4 V and enters high-ohmic shutdown when EN ≤ 0.4 V. These thresholds are independent of input voltage and compatible with 1.8 V and 3.3 V GPIOs, ensuring reliable control in mixed-voltage systems using LD6806CX4/36H,315.

What output capacitor is required for stable operation of the LD6806CX4/36H,315?

The LD6806CX4/36H,315 requires a minimum 1.0 µF X7R ceramic capacitor at the OUT pin, with ESR between 5 mΩ and 500 mΩ. The capacitor must maintain ≥0.7 µF across −40 °C to +125 °C. Using this specified capacitor ensures stability, achieves the rated 200 µs start-up time, and maintains PSRR and noise performance - all critical for proper LD6806CX4/36H,315 operation.

How does the thermal protection work in the LD6806CX4/36H,315?

The LD6806CX4/36H,315 incorporates a junction temperature watchdog that disables regulation at 160 °C and remains off until temperature drops by 20 K (to ~140 °C) before auto-recovery. This hysteresis prevents thermal oscillation. The WLCSP4 package's 130 K/W thermal resistance means power dissipation must be carefully managed - for example, at 200 mA and 60 mV dropout, P_D = 12 mW yields ~1.6 °C rise above ambient, well within safe limits for LD6806CX4/36H,315.

Is the LD6806CX4/36H,315 pin-compatible with other variants in the LD6806 family?

No - the LD6806CX4/36H,315 uses a 4-bump WLCSP4 layout (A1=GND, A2=EN, B1=OUT, B2=IN), which is physically and electrically distinct from the 5-pin SOT753 and 6-pin SOT886 variants. While functional behavior (3.6 V output, high-ohmic disable) is identical, PCB layout, soldering process, and thermal design differ significantly. Substitution requires full redesign - LD6806CX4/36H,315 is not a drop-in replacement for other package types.