NXP Semiconductors LD6836CX4/18H,315

Overview

LD6836CX4/18H,315 from NXP Semiconductors is a 1.8 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 LD6836CX4/18H,315 datasheet, LD6836CX4/18H,315 pinout, LD6836CX4/18H,315 application, or LD6836CX4/18H,315 equivalent, key selection criteria include its 1.8 V precision output, WLCSP4 footprint constraints, enable-active-HIGH timing (150 µs startup), PSRR of −55 dB at 1 kHz, and thermal shutdown at 160 °C with 20 K hysteresis.

Technical Context

The LD6836CX4/18H,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 delivering ±0.5% output accuracy at 25 °C. Its enable input (VEN) accepts 1.1–5.5 V logic-high signals independent of input supply, and it integrates overtemperature protection with 160 °C trip and 20 K hysteresis.

This device belongs to the LD6836x/xxH variant group, meaning it enters a high-impedance (3-state) output mode when disabled - unlike /xxP variants that activate an internal pull-down transistor. It requires a minimum 0.7 µF X7R ceramic output capacitor (ESR 5–500 mΩ) for stability and exhibits 55 dB PSRR at 1 kHz under 30 mA load.

Key Specifications

Pinout & Package

LD6836CX4/18H,315 uses a 4-bump Wafer-Level Chip-Scale Package (WLCSP4) with 0.4 mm pitch, dimensions 0.76 mm × 0.76 mm × 0.47 mm, and laser-marked pin A1 index. The package 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 LD6836TD/18H, the LD6836CX4/18H,315 saves >85% board area but trades 10 mV higher dropout and slightly worse thermal resistance; versus AP7361D-18YG-13, it delivers superior noise immunity and field-reliability via 10 kV HBM protection - critical for handheld electronics.

Availability

LD6836CX4/18H,315 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 with guaranteed long-term manufacturability.

Supply support for LD6836CX4/18H,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 LD6836 series is part of NXP's ultra-low-noise, miniaturized power management portfolio - engineered specifically for space- and noise-constrained portable electronics where WLCSP integration, sub-100 mV dropout, and 10 kV ESD robustness are mandatory.

FAQ

What is the nominal output voltage and tolerance of the LD6836CX4/18H,315?

The LD6836CX4/18H,315 provides a fixed 1.8 V output with ±0.5% tolerance at 25 °C and ±3% over the full operating temperature range (−40 °C to +85 °C). This accuracy is maintained across input voltages from 2.3 V to 5.5 V and load currents up to 300 mA, making it suitable for precision 1.8 V I/O rail applications without external trimming.

Does the LD6836CX4/18H,315 require an external output capacitor, and what are the specifications?

Yes, the LD6836CX4/18H,315 requires a minimum 0.7 µF X7R ceramic output capacitor with ESR between 5 mΩ and 500 mΩ for stable operation. The recommended value is 1.0 µF, and capacitor tolerance must be ±30% or better across −40 °C to +125 °C. Failure to meet these specs may cause oscillation or degraded transient response.

How does the enable functionality work on the LD6836CX4/18H,315?

The LD6836CX4/18H,315 features an active-HIGH enable input (EN) with VIH ≥ 1.1 V and VIL ≤ 0.4 V. When EN is pulled high, the device starts regulating within 150 µs; when pulled low, it enters high-ohmic (3-state) output mode - isolating the OUT pin completely. No external pull-up or pull-down resistors are required due to internal biasing.

What thermal protection features does the LD6836CX4/18H,315 include?

The LD6836CX4/18H,315 incorporates overtemperature shutdown at 160 °C with 20 K hysteresis, plus output current limiting to protect against short-circuit faults. These features operate independently of enable state and remain active even during disable, ensuring safe thermal behavior in all operating conditions - critical for sealed portable enclosures.

Is the LD6836CX4/18H,315 compatible with lead-free reflow soldering processes?

Yes, the LD6836CX4/18H,315 is qualified for lead-free reflow soldering per J-STD-020C. Its WLCSP4 package has a moisture sensitivity level (MSL) compliant with standard handling protocols, and the peak reflow temperature profile must not exceed 260 °C for ≤30 seconds. Proper PCB land pattern per Figure 26 is required to ensure reliable solder joint formation.