NXP Semiconductors LD6836CX4/36P,315

Overview

LD6836CX4/36P,315 from NXP Semiconductors is a 3.6 V fixed-output, 300 mA ultra-low-dropout linear regulator in a 0.4 mm pitch WLCSP4 package (0.76 × 0.76 × 0.47 mm), featuring 90 mV dropout at full load, 30 µV_RMS output noise (10 Hz–100 kHz), and auto-discharge functionality via integrated pull-down transistor. It serves as a precision power supply for core logic and RF circuitry in space-constrained portable electronics.

For engineers reviewing the LD6836CX4/36P,315 datasheet, LD6836CX4/36P,315 pinout, LD6836CX4/36P,315 application, or LD6836CX4/36P,315 equivalent, key selection criteria include its 3.6 V output accuracy (±2% over temperature), 55 dB PSRR at 1 kHz, 150 µs startup time, low-quiescent-current shutdown mode (0.1 µA typ), and WLCSP4 thermal resistance of 130 K/W.

Technical Context

The LD6836CX4/36P,315 implements a PMOS pass transistor architecture enabling ultra-low dropout operation down to 90 mV at 300 mA, with internal voltage reference and error amplifier ensuring stable regulation across −40 °C to +85 °C ambient. Its enable input (active HIGH, VIH ≥ 1.1 V) controls both regulation and the integrated pull-down switch that actively discharges the output during disable.

Designed for high-noise-immunity applications, it delivers 55 dB power supply rejection at 1 kHz and maintains 30 µV_RMS output noise with a 1 µF X7R ceramic output capacitor. Over-temperature shutdown (160 °C) and current limiting (600 mA short-circuit) provide robust protection without external components.

Key Specifications

Pinout & Package

LD6836CX4/36P,315 uses a 4-bump Wafer-Level Chip-Scale Package (WLCSP4) with 0.4 mm pitch and footprint 0.76 mm × 0.76 mm. The package has no leads; solder bumps are arranged in a 2×2 grid with index area marking bump A1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD6836CX4/36H and XC6210B362MR-G, LD6836CX4/36P,315 uniquely combines 300 mA capability, 90 mV dropout, 30 µV_RMS noise, and integrated 100 Ω pull-down in a 0.76 mm² WLCSP - making it the sole option for space-constrained, fast-sequencing, low-noise 3.6 V systems requiring guaranteed output discharge.

Availability

LD6836CX4/36P,315 is available at Aetrix Electronics and suitable for smartphone power management, wireless earbud SoC supply, digital camera sensor biasing, and portable media player audio subsystems requiring stable component supply with consistent WLCSP4 sourcing.

Supply support for LD6836CX4/36P,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 specializing in secure connectivity solutions for automotive, industrial, and consumer applications, with leadership in power management and RF technologies.

The LD6836 series was designed specifically for ultra-miniaturized portable electronics, delivering ultra-low-noise, low-dropout regulation in wafer-level chip-scale packaging to meet stringent size, efficiency, and EMI requirements of modern mobile devices.

FAQ

What is the nominal output voltage and tolerance of the LD6836CX4/36P,315?

The LD6836CX4/36P,315 provides a fixed 3.6 V nominal output voltage with a tolerance of ±2% over the full operating temperature range (−40 °C to +85 °C) and load conditions (1 mA to 300 mA). This specification is verified per Table 12 in the NXP LD6836_SER datasheet Rev. 2, ensuring compatibility with 3.3 V–3.6 V logic interfaces and RF ICs requiring tight supply regulation.

Does the LD6836CX4/36P,315 include an auto-discharge function, and how does it operate?

Yes, the LD6836CX4/36P,315 integrates an auto-discharge function via an internal 100 Ω pull-down transistor on the OUT pin. When the EN pin is driven LOW (≤0.4 V), the regulator disables and simultaneously activates this transistor to rapidly discharge the output capacitance - achieving <300 µs discharge time to 5% of nominal voltage with a 1 µF load capacitor, as specified in Table 12.

What is the recommended external capacitor configuration for stable operation of the LD6836CX4/36P,315?

The LD6836CX4/36P,315 requires a minimum 0.7 µF X7R ceramic capacitor on the OUT pin (typical 1.0 µF) with ESR between 5 mΩ and 500 mΩ, and a matching 0.7–1.0 µF capacitor on the IN pin. These values are specified in Table 13 and Figure 20 of the datasheet to ensure stability, minimize startup overshoot, and maintain PSRR performance across temperature and frequency.

What thermal performance can be expected from the LD6836CX4/36P,315 in a standard PCB layout?

In a two-layer PCB layout per the datasheet's test conditions, the LD6836CX4/36P,315 exhibits a typical junction-to-ambient thermal resistance (R_th(j-a)) of 130 K/W. Effective thermal performance requires solid copper connections from all four bumps to internal ground/power planes and avoidance of solder-mask over the die area, as detailed in Section 7 and Table 11.

Is the LD6836CX4/36P,315 RoHS-compliant and halogen-free?

Yes, the LD6836CX4/36P,315 is Pb-free, RoHS-compliant, and fully compliant with NXP's "dark green" standard - meaning it is free of halogen and antimony. This compliance is confirmed in Section 1.2 of the LD6836_SER datasheet Rev. 2 and supports environmentally regulated consumer electronics manufacturing.