NXP Semiconductors LD6836CX4/25H,315

Overview

LD6836CX4/25H,315 from NXP Semiconductors is a 2.5 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 high-ohmic (3-state) output during disable. It serves as a precision local power rail for core logic or RF circuitry in space-constrained portable electronics.

For engineers reviewing the LD6836CX4/25H,315 datasheet, LD6836CX4/25H,315 pinout, LD6836CX4/25H,315 application, or LD6836CX4/25H,315 equivalent, key selection criteria include its 2.5 V output accuracy (±0.5% at +25°C), 55 dB PSRR at 1 kHz, 150 µs startup time, and thermal shutdown at 160°C - all validated for operation across −40°C to +85°C ambient.

Technical Context

The LD6836CX4/25H,315 implements a PMOS pass transistor architecture enabling ultra-low dropout and low quiescent current (0.1 µA in shutdown). Its internal bandgap reference and error amplifier deliver tight output regulation under varying line (±0.1%/V) and load (0.0025%/mA) conditions.

As a high-ohmic output variant (denoted by "H"), it disconnects the output via an open-drain configuration when disabled - eliminating leakage paths and preserving downstream bias integrity in multi-rail power sequencing. ESD protection meets 10 kV HBM per IEC 61340-3-1.

Key Specifications

Pinout & Package

LD6836CX4/25H,315 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 are arranged in a 2×2 grid; bump A1 is index-marked.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD6836CX4/25P, LD6836CX4/25H,315 offers true high-impedance disable for voltage domain isolation, while TPS7A0525PDBVR trades current capability and dropout for slightly reduced size - making LD6836CX4/25H,315 optimal for 300 mA, noise-sensitive, sequenced 2.5 V rails.

Availability

LD6836CX4/25H,315 is available at Aetrix Electronics and suitable for smartphone power management, portable camera modules, Bluetooth LE wearables, and other compact consumer electronics requiring stable component supply with guaranteed long-term sourcing.

Supply support for LD6836CX4/25H,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.

The LD6836 series was designed specifically for miniaturized portable electronics requiring ultra-low-noise, high-accuracy, and space-efficient power regulation - targeting smartphones, wearables, and imaging devices.

FAQ

What is the nominal output voltage and tolerance of the LD6836CX4/25H,315?

The LD6836CX4/25H,315 delivers a fixed 2.5 V output with ±0.5% initial accuracy at +25°C and ±3% over −40°C to +85°C ambient. This tight tolerance ensures reliable operation of 2.5 V I/O interfaces and analog circuitry without external feedback adjustment. The specification is verified per Table 12 in the NXP LD6836_SER datasheet Rev. 2.

Does the LD6836CX4/25H,315 require an external output capacitor, and what value is recommended?

Yes, the LD6836CX4/25H,315 requires a minimum 0.7 µF X7R ceramic capacitor on the OUT pin for stability, with 1.0 µF recommended. Equivalent Series Resistance (ESR) must be between 5 mΩ and 500 mΩ. This capacitor placement directly impacts startup time and load transient response - undersizing risks oscillation, especially in high-frequency portable designs using the LD6836CX4/25H,315.

How does the high-ohmic disable feature of the LD6836CX4/25H,315 function during power-down sequencing?

When the EN pin is driven LOW (≤0.4 V), the LD6836CX4/25H,315 places the OUT pin in a high-impedance (3-state) condition - effectively disconnecting the output from the pass element. This prevents back-feeding, eliminates leakage paths, and allows independent discharge of downstream capacitance. Unlike P-variant parts, LD6836CX4/25H,315 does not integrate a pull-down transistor, making it ideal for strict voltage-domain isolation in multi-rail systems.

What is the maximum input voltage and thermal limit for continuous operation of the LD6836CX4/25H,315?

The LD6836CX4/25H,315 supports input voltages from 2.3 V to 5.5 V continuously, with transient tolerance up to +6.0 V for 4 ms. Its junction temperature must remain ≤+125°C for reliable operation, with thermal shutdown activating at +160°C (20 K hysteresis). At 300 mA load and +85°C ambient, the WLCSP4 package's 130 K/W junction-to-ambient thermal resistance requires adequate PCB copper area to avoid derating.

Is the LD6836CX4/25H,315 RoHS-compliant and halogen-free?

Yes, the LD6836CX4/25H,315 is fully RoHS-compliant, lead-free, and halogen- and antimony-free - meeting NXP's "dark green" compliance standard. This ensures environmental safety and compatibility with lead-free reflow soldering profiles (peak temperature ≤260°C), as confirmed in Section 1.2 and Table 3 of the LD6836_SER product data sheet.