NXP Semiconductors LD6816CX4/27H,315

Overview

LD6816CX4/27H,315 from NXP Semiconductors is a 2.7 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 LD6816CX4/27H,315 datasheet, LD6816CX4/27H,315 pinout, LD6816CX4/27H,315 application, or LD6816CX4/27H,315 equivalent, key selection criteria include its 2.7 V output accuracy (±0.5% at +25°C), 55 dB PSRR at 1 kHz, <150 µs startup time, and thermal shutdown at 160°C-critical for compact battery-powered systems requiring stable low-noise biasing.

Technical Context

The LD6816CX4/27H,315 uses a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across 10 Hz–100 kHz. Its enable input (active HIGH, VIH ≥1.1 V) controls a high-impedance output state-no pull-down transistor-making it suitable for systems requiring isolation between power domains during standby.

Internal over-temperature protection (160°C trip with 20 K hysteresis) and current limiting (600 mA short-circuit) operate independently of external components. The device maintains ±3% output voltage tolerance over −40°C to +85°C ambient and supports 0.7–1.0 µF X7R ceramic output capacitors with 5–500 mΩ ESR.

Key Specifications

Pinout & Package

LD6816CX4/27H,315 is housed in a 0.76 mm × 0.76 mm × 0.47 mm Wafer-Level Chip-Scale Package (WLCSP4) with 0.4 mm bump pitch and Pb-free, RoHS-compliant construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD6816CX4/27H,315, the XC6219B272MR-G trades miniaturization and 3-state disable for cost and simplicity, while the RP114K271D-TR-F achieves smaller footprint at the expense of ESD robustness and missing thermal hysteresis data-making LD6816CX4/27H,315 optimal for high-reliability portable systems demanding proven 10 kV HBM and 20 K thermal recovery.

Availability

LD6816CX4/27H,315 is available at Aetrix Electronics and suitable for smartphone power management, portable camera sensor biasing, GPS receiver front-end supplies, and audio codec regulation requiring stable component supply with guaranteed long-term availability.

Supply support for LD6816CX4/27H,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 markets, with leadership in power management ICs and RF technologies.

The LD6816 series was designed specifically for ultra-compact, low-noise power regulation in battery-powered mobile devices-emphasizing miniaturization (WLCSP4), efficiency (ultra-low dropout), and signal integrity (high PSRR, low noise).

FAQ

What is the output voltage tolerance of LD6816CX4/27H,315 over temperature?

The LD6816CX4/27H,315 maintains ±3% output voltage tolerance across the full operating ambient temperature range of −40°C to +85°C. At +25°C, the tolerance tightens to ±0.5%, ensuring precise 2.7 V regulation for timing-critical logic and analog circuits. This specification is verified per Table 9 in the NXP datasheet Rev. 1 (2012), with no derating required under recommended conditions.

Does LD6816CX4/27H,315 support automatic discharge when disabled?

No, LD6816CX4/27H,315 does not provide auto-discharge functionality. As indicated by the "H" suffix and confirmed in Section 1.1 and Table 1, this variant enters a high-ohmic (3-state) output condition during disable-leaving the output floating. Auto-discharge is only available in "P" and "CxxP" variants, which integrate a pull-down transistor. LD6816CX4/27H,315 requires external circuitry if rapid output discharge is needed.

What is the minimum recommended output capacitor for stable operation of LD6816CX4/27H,315?

The LD6816CX4/27H,315 requires a minimum 0.7 µF X7R ceramic capacitor at the OUT pin, with ESR between 5 mΩ and 500 mΩ, as specified in Table 10 and Section 10.1. A 1.0 µF X7R capacitor is recommended for optimal transient response and PSRR performance. Using lower capacitance risks instability, while exceeding 1.0 µF increases shutdown time but does not harm regulation.

Can LD6816CX4/27H,315 operate with an input voltage below 2.7 V?

Yes, LD6816CX4/27H,315 can operate with input voltages as low as 2.3 V, but regulation is only maintained when VIN exceeds VOUT + V_DO. With a typical dropout of 45 mV at 150 mA, the device delivers regulated 2.7 V output down to VIN = 2.745 V. Below that, output voltage drops linearly with input-enabling graceful brown-out behavior in battery-powered systems.

What is the thermal resistance (R_th(j-a)) of LD6816CX4/27H,315 on a standard PCB?

The typical junction-to-ambient thermal resistance (R_th(j-a)) of LD6816CX4/27H,315 is 130 K/W under standard test conditions (T_amb = 25°C, two-layer PCB), as stated in Table 8. Actual performance depends heavily on PCB layout: solid copper connections to GND and IN pins, use of inner-layer heat spreaders, and avoidance of solder-mask under the die all reduce effective R_th(j-a) by up to 40%.