NXP Semiconductors LD6836CX4/36H,315

Overview

LD6836CX4/36H 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 mm × 0.76 mm × 0.47 mm), featuring 90 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 portable applications including smartphone baseband ICs and camera sensor rails.

For engineers reviewing the LD6836CX4/36H datasheet, LD6836CX4/36H pinout, LD6836CX4/36H application, or LD6836CX4/36H equivalent, this page delivers verified electrical specs, WLCSP4 terminal mapping, thermal resistance (130 K/W), PSRR (55 dB @ 1 kHz), and design-critical enable timing (150 µs startup) - all confirmed against NXP's Rev. 2 Product Data Sheet (Oct 2012).

Technical Context

The LD6836CX4/36H implements a PMOS pass transistor architecture enabling ultra-low dropout (90 mV typ. @ 300 mA) and stable operation with only 0.7 µF external output capacitance. Its internal voltage reference and error amplifier maintain ±0.5% output accuracy over temperature (−40 °C to +85 °C) and load (1–300 mA).

It integrates active-high enable logic (VIH = 1.1 V min), over-temperature shutdown (160 °C), current limiting (600 mA short-circuit), and 10 kV HBM ESD protection. The high-ohmic disable state (no pull-down) preserves downstream circuit biasing integrity in battery-powered sleep modes.

Key Specifications

Pinout & Package

LD6836CX4/36H uses a 4-bump Wafer-Level Chip-Scale Package (WLCSP4) with 0.4 mm pitch and footprint 0.76 mm × 0.76 mm. Solder bumps face down; index area marks bump A1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD6836TD/36H, LD6836CX4/36H offers 3.5× smaller footprint and lower thermal resistance per unit area but requires WLCSP assembly capability; versus TPS7A0536PDBVR, it delivers superior dropout and PSRR at the cost of higher shutdown IQ - making it optimal for space-constrained, noise-sensitive mobile power rails.

Availability

LD6836CX4/36H is available at Aetrix Electronics and suitable for smartphone baseband power, digital camera sensor rails, portable media player audio codecs, and personal navigation device GPS front-ends requiring stable component supply across high-volume production cycles.

Supply support for LD6836CX4/36H 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 mobile applications, with leadership in RF, analog, and power management ICs.

The LD6836 series was designed specifically for miniaturized portable electronics demanding ultra-low-noise, ultra-low-dropout regulation in wafer-level packaging - targeting next-generation smartphones, wearables, and compact imaging devices.

FAQ

What is the minimum input voltage required for stable 3.6 V output from the LD6836CX4/36H?

The LD6836CX4/36H requires a minimum input voltage of 3.69 V (3.6 V + 90 mV dropout) to maintain regulation at 300 mA load. At lighter loads, input can drop further - e.g., 3.62 V at 100 mA - but must remain ≥2.3 V per absolute rating. Input below VO(nom) + Vdo risks dropout and unregulated output.

Does the LD6836CX4/36H require an external output capacitor, and what value is recommended?

Yes, the LD6836CX4/36H requires an external output capacitor for stability. NXP specifies a minimum of 0.7 µF (±30% tolerance, X7R dielectric) with ESR between 5 mΩ and 500 mΩ. A 1.0 µF X7R capacitor is recommended for optimal transient response and PSRR performance across temperature.

How does the high-ohmic disable state of the LD6836CX4/36H affect downstream circuit behavior?

When disabled, the LD6836CX4/36H places its OUT pin in a high-impedance (floating) state - no internal pull-down or pull-up. This preserves voltage on downstream capacitors and avoids unintended discharge paths, critical for retaining bias in analog circuits or memory retention during sleep modes.

What is the thermal performance of the LD6836CX4/36H on a standard 2-layer PCB?

On a standard 2-layer PCB, the LD6836CX4/36H has a junction-to-ambient thermal resistance (R_th(j-a)) of 130 K/W. At 300 mA output and 3.6 V, power dissipation is ~27 mW - resulting in ~3.5 °C junction rise above ambient, well within safe operating limits up to +85 °C ambient.

Can the LD6836CX4/36H be used with a 1.8 V enable signal from an application processor GPIO?

Yes - the LD6836CX4/36H accepts VIH ≥ 1.1 V and VIL ≤ 0.4 V, making it fully compatible with 1.8 V GPIOs. A 1.8 V logic HIGH exceeds the 1.1 V minimum threshold by 0.7 V margin, ensuring robust enable functionality even with trace resistance or noise.