NXP Semiconductors LD6816CX4/30H,315

Overview

LD6816CX4/30H,315 from NXP Semiconductors is a 3.0 V fixed-output, 150 mA ultra-low-dropout linear regulator in WLCSP4 package, featuring 45 mV dropout at full load, 30 µV_RMS output noise (10 Hz–100 kHz), and high-ohmic (3-state) output during disable-designed for power-sensitive mobile interfaces in smartphones and portable media players.

For engineers reviewing the LD6816CX4/30H,315 datasheet, LD6816CX4/30H,315 pinout, LD6816CX4/30H,315 application, or LD6816CX4/30H,315 equivalent, key selection criteria include its 2.3–5.5 V input range, 55 dB PSRR at 1 kHz, <150 µs startup time, thermal/overcurrent protection, and RoHS-compliant 0.76 mm × 0.76 mm × 0.47 mm WLCSP footprint.

Technical Context

The LD6816CX4/30H,315 implements a PMOS pass transistor architecture enabling ultra-low dropout operation and stable regulation across −40 °C to +85 °C ambient. Its enable input (active HIGH) controls a high-impedance output state when disabled-eliminating residual leakage paths without requiring external discharge circuitry.

Internal reference generation, over-temperature shutdown (160 °C with 20 K hysteresis), and current limiting (600 mA short-circuit) ensure robust operation in compact battery-powered systems. The device requires only a 1.0 µF X7R ceramic output capacitor with ESR between 5 mΩ and 500 mΩ for stability.

Key Specifications

Pinout & Package

LD6816CX4/30H,315 uses a 0.4 mm pitch Wafer-Level Chip-Scale Package (WLCSP4) measuring 0.76 mm × 0.76 mm × 0.47 mm, with four solder bumps in a 2×2 array and laser-marked pin A1 index area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD6816CX4/30H,315, the XC6206P302MR trades miniaturization and protection for cost and availability, while the RP111N301B-TR-F offers smaller area at the expense of higher dropout and inverted enable-neither matches the combination of 45 mV dropout, 30 µV noise, and true 3-state disable in a 0.76 mm² WLCSP.

Availability

LD6816CX4/30H,315 is available at Aetrix Electronics and suitable for smartphone power management, portable media player audio subsystems, and GPS receiver front-end biasing requiring stable component supply, long-term lifecycle support, and consistent wafer-level packaging performance.

Supply support for LD6816CX4/30H,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 LD6816 series was designed specifically for ultra-miniaturized, low-noise power regulation in portable consumer electronics-emphasizing wafer-level packaging, sub-50 mV dropout, and integrated protection for battery-operated devices.

FAQ

What is the nominal output voltage and tolerance of the LD6816CX4/30H,315?

The LD6816CX4/30H,315 delivers a fixed 3.0 V output with ±2% tolerance over −40 °C to +85 °C ambient temperature and 1 mA load, per Table 9 in the NXP datasheet. This accuracy is maintained across line and load variations, supporting reliable operation in precision analog and digital I/O domains where stable voltage references are critical. The LD6816CX4/30H,315 achieves this using an internal bandgap reference and trimmed feedback resistors.

Does the LD6816CX4/30H,315 include thermal protection, and what is its shutdown threshold?

Yes, the LD6816CX4/30H,315 integrates over-temperature protection with a shutdown threshold of 160 °C and 20 K hysteresis, as specified in Table 9. When junction temperature exceeds 160 °C, the regulator disables output and remains off until temperature drops below 140 °C. This safeguard prevents permanent damage during sustained overload or poor PCB thermal design. The LD6816CX4/30H,315 relies on its WLCSP4 package's thermal resistance (R_th(j-a) = 130 K/W) and proper copper layout for effective heat dissipation.

What output capacitor is required for stable operation of the LD6816CX4/30H,315?

The LD6816CX4/30H,315 requires a minimum 0.7 µF external ceramic output capacitor (X7R dielectric recommended), with typical value 1.0 µF and ESR between 5 mΩ and 500 mΩ, per Table 10 and Section 10.1. Using a 1.0 µF X7R capacitor ensures stability across −40 °C to +125 °C and avoids oscillation during load transients. Deviating below 0.7 µF risks instability; exceeding 500 mΩ ESR may degrade transient response. The LD6816CX4/30H,315's performance is validated with this configuration.

How does the enable functionality work on the LD6816CX4/30H,315, and what happens to the output when disabled?

The LD6816CX4/30H,315 features an active-HIGH enable pin (EN, A2) with VIH ≥ 1.1 V and VIL ≤ 0.4 V. When EN is pulled LOW, the regulator enters shutdown mode and places the OUT pin (B1) into a high-ohmic (3-state) condition-no internal pull-down or pull-up is activated. This behavior eliminates standby current paths and avoids unintended loading of downstream circuits. The LD6816CX4/30H,315 thus differs from 'P' variants that integrate auto-discharge transistors.

Is the LD6816CX4/30H,315 RoHS-compliant and halogen-free?

Yes, the LD6816CX4/30H,315 is Pb-free, compliant with the EU Restriction of Hazardous Substances (RoHS) Directive, and free of halogen and antimony-meeting NXP's "dark green" environmental standard as stated in Section 1.2. All materials, plating, and packaging meet JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for reflow soldering. The LD6816CX4/30H,315 is qualified for consumer applications per NX1-00023 reliability specification.