NXP Semiconductors LD6806CX4/29H,315

Overview

LD6806CX4/29H,315 from NXP Semiconductors is a 2.9 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 subsystems requiring stable low-noise bias.

For engineers reviewing the LD6806CX4/29H,315 datasheet, LD6806CX4/29H,315 pinout, LD6806CX4/29H,315 application, or LD6806CX4/29H,315 equivalent, key selection criteria include its 2.9 V fixed output, thermal shutdown (160 °C), 55 dB PSRR at 1 kHz, enable threshold (VIH = 1.4 V, VIL = 0.4 V), and WLCSP4 footprint compatibility with space-constrained PCB layouts.

Technical Context

The LD6806CX4/29H,315 implements a PMOS pass transistor architecture enabling ultra-low dropout voltage and fast 200 µs startup time. Its internal reference generator, overcurrent protection, and thermal watchdog operate independently of enable state, ensuring robustness during transient load or overtemperature events.

As a high-ohmic-output variant (suffix 'H'), it disconnects the output via an open-circuit state when disabled-critical for preventing back-powering in multi-rail systems. The device requires ≥1.0 µF X7R ceramic output capacitance with ESR between 5 mΩ and 500 mΩ for stability across −40 °C to +85 °C ambient.

Key Specifications

Pinout & Package

LD6806CX4/29H,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 XC6219B292MR-G and RT9013-29GB, LD6806CX4/29H,315 delivers superior miniaturization (0.76 mm² vs ≥8.2 mm²), lowest dropout (60 mV), and true 3-state disable-making it optimal for next-gen compact mobile and wearable designs demanding tight voltage tolerance and zero-backfeed behavior.

Availability

LD6806CX4/29H,315 is available at Aetrix Electronics and suitable for mobile handset power management, RF transceiver biasing, wearable sensor hubs, and portable media player audio subsystems requiring stable component supply with guaranteed long-term sourcing.

Supply support for LD6806CX4/29H,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 applications.

The LD6806 series was designed specifically for space-constrained, battery-powered consumer electronics-emphasizing ultra-low dropout, low noise, and miniature packaging to extend runtime and reduce PCB area in smartphones and wearables.

FAQ

What is the nominal output voltage of LD6806CX4/29H,315?

The LD6806CX4/29H,315 delivers a fixed nominal output voltage of 2.9 V, with a tolerance of ±2% over the operating temperature range of −30 °C to +85 °C. This value is laser-trimmed during manufacturing and does not require external resistors. The '29H' suffix explicitly denotes the 2.9 V high-ohmic output variant within the LD6806 family.

Does LD6806CX4/29H,315 support enable control, and what are its logic thresholds?

Yes, LD6806CX4/29H,315 features an active-HIGH enable pin (EN). It asserts regulation when EN voltage exceeds 1.4 V (VIH min) and disables output when EN falls below 0.4 V (VIL max). The threshold is independent of input voltage and remains stable across −40 °C to +85 °C ambient, enabling direct interfacing with 1.8 V or 3.3 V microcontroller GPIOs without level shifters.

What output capacitor is required for stable operation of LD6806CX4/29H,315?

LD6806CX4/29H,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 capacitance across −40 °C to +125 °C (±30% tolerance). Using a 1.0 µF, 6.3 V X7R part placed within 2 mm of the WLCSP4 package ensures stability, fast transient response, and compliance with the 200 µs startup specification.

How does the high-ohmic disable feature of LD6806CX4/29H,315 benefit system design?

The high-ohmic (3-state) disable mode of LD6806CX4/29H,315 places the OUT pin in an open-circuit condition when EN is LOW-preventing back-powering of downstream circuits and eliminating leakage paths in multi-rail systems. This avoids unintended wake-up of powered-down peripherals and simplifies power sequencing in mobile SoC platforms where multiple voltage domains must be isolated during sleep states.

Is LD6806CX4/29H,315 compatible with lead-free reflow soldering processes?

Yes, LD6806CX4/29H,315 is fully compatible with lead-free reflow soldering per J-STD-020C. Its WLCSP4 package (thickness 0.47 mm, volume <350 mm³) requires a peak reflow temperature of 260 °C. Moisture sensitivity level (MSL) is 1, permitting unlimited floor life at ≤30 °C/60% RH. Reflow profile must include controlled ramp-up, soak, and cooling phases to avoid solder voiding or bump fracture.