NXP Semiconductors LD6816CX4/23H,315

Overview

LD6816CX4/23H,315 from NXP Semiconductors is a 2.3 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 LD6816CX4/23H,315 datasheet, LD6816CX4/23H,315 pinout, LD6816CX4/23H,315 application, or LD6816CX4/23H,315 equivalent, key selection criteria include its 2.3 V output accuracy (±3% over −40 °C to +85 °C), 55 dB PSRR at 1 kHz, sub-150 µs startup time, and WLCSP4 footprint compatibility with high-density portable PCB layouts.

Technical Context

The LD6816CX4/23H,315 employs a PMOS pass transistor architecture enabling ultra-low dropout operation down to 45 mV at 150 mA, with internal voltage reference and error amplifier ensuring stable regulation across input voltages from 2.3 V to 5.5 V. Its enable input (VEN) operates with TTL-compatible thresholds (V_IL ≤ 0.4 V, V_IH ≥ 1.1 V) and drives a high-impedance output state when disabled-no pull-down transistor included.

Thermal protection triggers at 160 °C with 20 K hysteresis, and current limiting caps peak output at 300 mA (for V_OUT ≥ 1.8 V). The device integrates ESD protection rated to ±10 kV HBM and requires a minimum 0.7 µF X7R ceramic output capacitor with ESR between 5 mΩ and 500 mΩ for stability.

Key Specifications

Pinout & Package

LD6816CX4/23H,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 arranged in a 2×2 grid and laser-marked with code "L" indicating 2.3 V / high-ohmic disable mode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD6816CX4/23P, LD6816CX4/23H,315 provides superior domain isolation in multi-rail systems; versus XC6210B232MR-G, it delivers 20 mV lower dropout and 5 µV lower noise in a footprint 95% smaller-critical for modern mobile PCB miniaturization.

Availability

LD6816CX4/23H,315 is available at Aetrix Electronics and suitable for smartphone power management, portable camera sensor biasing, and GPS receiver front-end regulation requiring stable component supply with guaranteed long-term sourcing.

Supply support for LD6816CX4/23H,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, battery-powered portable electronics-delivering ultra-low dropout, low noise, and WLCSP packaging to meet stringent size and efficiency demands of smartphones and wearables.

FAQ

What is the nominal output voltage and tolerance of the LD6816CX4/23H,315?

The LD6816CX4/23H,315 delivers a fixed 2.3 V output with ±3% tolerance over the full operating temperature range of −40 °C to +85 °C. This specification is verified per Table 9 in the NXP datasheet and applies under 1 mA to 150 mA load conditions with input voltage between 2.3 V and 5.5 V. The LD6816CX4/23H,315 does not require external resistors to set output voltage.

Does the LD6816CX4/23H,315 include an auto-discharge function?

No, the LD6816CX4/23H,315 does not include an auto-discharge function. As indicated by the "H" suffix and confirmed in Section 1.1 and Table 1, it enters a high-ohmic (3-state) output state when disabled via the EN pin. In contrast, "P" and "CxxP" variants integrate a pull-down transistor. The LD6816CX4/23H,315 maintains output isolation during shutdown.

What is the recommended output capacitor for stable operation of the LD6816CX4/23H,315?

The LD6816CX4/23H,315 requires a minimum 0.7 µF X7R ceramic capacitor with ESR between 5 mΩ and 500 mΩ at the OUT pin. NXP recommends 1.0 µF as the typical value (Table 10), placed as close as possible to the device. Using capacitors outside this range may cause instability or excessive startup/shutdown transients. The LD6816CX4/23H,315 is not compatible with tantalum or aluminum electrolytic capacitors due to ESR constraints.

How does the enable pin (EN) interface with common logic families?

The EN pin of the LD6816CX4/23H,315 accepts TTL-compatible logic levels: V_IL ≤ 0.4 V (LOW) and V_IH ≥ 1.1 V (HIGH), independent of input voltage. It is directly compatible with 1.8 V and 3.3 V GPIO outputs without level shifters. When left floating, EN defaults to LOW, disabling the regulator and placing OUT in high-ohmic state. The LD6816CX4/23H,315 draws only 0.1 µA in this state.

What thermal derating applies to the LD6816CX4/23H,315 in a standard two-layer PCB layout?

With a two-layer PCB per datasheet conditions, the LD6816CX4/23H,315 has a junction-to-ambient thermal resistance (R_th(j-a)) of 130 K/W (Table 8). At 150 mA load and 5.5 V input, power dissipation reaches ~480 mW, resulting in ~62 °C junction rise above ambient. To stay within the 125 °C max junction limit, ambient must remain below +63 °C. Layout improvements (e.g., thermal vias to inner ground planes) reduce R_th(j-a) and improve margin. The LD6816CX4/23H,315 includes thermal shutdown at 160 °C.