NXP Semiconductors LD6816CX4/13H,315

Overview

LD6816CX4/13H,315 from NXP Semiconductors is a 1.3 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 LD6816CX4/13H,315 datasheet, LD6816CX4/13H,315 pinout, LD6816CX4/13H,315 application, or LD6816CX4/13H,315 equivalent, key selection criteria include its 1.3 V output accuracy (±0.5% at +25°C), 55 dB PSRR at 1 kHz, <150 µs startup time, and WLCSP4 footprint compatibility with space-constrained PCB layouts.

Technical Context

The LD6816CX4/13H,315 implements a PMOS pass transistor architecture enabling ultra-low dropout operation down to 45 mV at 150 mA, with internal voltage reference and error amplifier ensuring stable regulation across −40°C to +85°C ambient. Its enable input (EN) operates with TTL-compatible thresholds (V_IL ≤ 0.4 V, V_IH ≥ 1.1 V) and drives a high-impedance output state when disabled-no pull-down transistor included.

Thermal protection triggers shutdown at 160°C junction temperature with 20 K hysteresis, while overcurrent limiting caps peak output at 300 mA and short-circuit current at 600 mA. The device requires a minimum 0.7 µF X7R ceramic output capacitor (1.0 µF typical) with ESR between 5 mΩ and 500 mΩ for stability.

Key Specifications

Pinout & Package

LD6816CX4/13H,315 uses a 0.4 mm pitch Wafer-Level Chip-Scale Package (WLCSP4), measuring 0.76 mm × 0.76 mm × 0.47 mm, with four solder bumps arranged in a 2×2 array. The package is Pb-free, RoHS-compliant, halogen- and antimony-free (dark green compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0513PDBVR and MCP1700T-1302E/TT, LD6816CX4/13H,315 delivers superior efficiency in space-constrained systems via its 45 mV dropout and 0.76 mm² WLCSP4 footprint, while its active-HIGH enable and high-ohmic disable support advanced power-domain isolation required in modern mobile SoCs.

Availability

LD6816CX4/13H,315 is available at Aetrix Electronics and suitable for smartphone core logic, digital camera sensor bias, portable media player audio codecs, and Bluetooth LE SoC I/O domains requiring stable component supply with tight voltage tolerance and ultra-miniature packaging.

Supply support for LD6816CX4/13H,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 mobile applications, with leadership in power management, RF, and embedded security.

The LD6816 series was designed specifically for ultra-low-power, space-constrained portable electronics-delivering high-accuracy, low-noise, and ultra-low-dropout regulation in wafer-level chip-scale packaging for next-generation mobile interfaces.

FAQ

What is the nominal output voltage and tolerance of the LD6816CX4/13H,315?

The LD6816CX4/13H,315 provides a fixed 1.3 V nominal output voltage with ±0.5% tolerance at +25°C ambient and ±4% over the full −30°C to +85°C operating range. This accuracy is maintained across input voltages from 2.3 V to 5.5 V and load currents from 1 mA to 150 mA, as verified in Table 9 of the NXP datasheet Rev. 1.

Does the LD6816CX4/13H,315 include an enable pin, and what are its logic thresholds?

Yes, the LD6816CX4/13H,315 features an active-HIGH enable pin (EN, Pin A2) with guaranteed logic thresholds: V_IL ≤ 0.4 V (maximum LOW level) and V_IH ≥ 1.1 V (minimum HIGH level). When EN is pulled below 0.4 V, the LD6816CX4/13H,315 enters shutdown mode and places the OUT pin in a high-ohmic (3-state) condition-no internal pull-down is present.

What output capacitor is required for stable operation of the LD6816CX4/13H,315?

The LD6816CX4/13H,315 requires a minimum 0.7 µF X7R ceramic capacitor at the OUT pin, with 1.0 µF recommended for optimal stability and transient response. The capacitor must exhibit an Equivalent Series Resistance (ESR) between 5 mΩ and 500 mΩ, and must be rated for the full −40°C to +125°C temperature range per Table 10 and Section 10.1 of the datasheet.

How does the dropout voltage of the LD6816CX4/13H,315 compare to conventional LDOs?

The LD6816CX4/13H,315 achieves a typical dropout voltage of just 45 mV at 150 mA output current-significantly lower than conventional LDOs (often >200 mV). This enables operation with minimal input-to-output differential, such as delivering 1.3 V from a 1.345 V source, thereby maximizing usable battery capacity in single-cell Li-ion systems.

Is the LD6816CX4/13H,315 RoHS-compliant and lead-free?

Yes, the LD6816CX4/13H,315 is fully RoHS-compliant, Pb-free, and free of halogen and antimony-meeting NXP's "dark green" environmental standard. Its WLCSP4 package uses lead-free solder bumps and complies with JEDEC J-STD-020 moisture sensitivity Level 1 (unlimited floor life at ≤30°C/60% RH).