NXP Semiconductors LD6815TD/28H,125

Overview

LD6815TD/28H from NXP Semiconductors is a fixed-output 2.8 V, 150 mA low-dropout linear regulator with ultra-high PSRR (75 dB at 1 kHz), 250 mV dropout at full load, and high-ohmic (3-state) output during disable. It operates from 2.3 V to 5.5 V input and delivers ultra-low RMS noise (40 µV, 10 Hz–100 kHz), making it suitable for powering noise-sensitive RF and analog circuitry in portable consumer devices.

For engineers reviewing the LD6815TD/28H datasheet, LD6815TD/28H pinout, LD6815TD/28H application, or LD6815TD/28H equivalent, key selection criteria include its 2.8 V fixed output, 3-state disable behavior (no auto-discharge), 0.1 µA shutdown current, SOT753 package compatibility, and PSRR performance critical for PMIC rail filtering in smartphones and mobile internet devices.

Technical Context

The LD6815TD/28H implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and P-channel pass transistor-enabling stable regulation with minimal headroom. Its high-ohmic disable mode isolates the output without sinking current, preserving downstream capacitance charge.

It requires only 1 µF ceramic output capacitance (X7R, ESR 5–500 mΩ) for stability and achieves 150 µs startup time. Thermal resistance is 125 K/W (junction-to-ambient), supporting operation up to +85 °C ambient with appropriate PCB copper area.

Key Specifications

Pinout & Package

SOT753 (TSOP5) plastic surface-mount package, 2.9 × 1.5 × 1.0 mm body size, 5-pin configuration with standard lead pitch (0.95 mm) and thermal pad-compatible footprint per Figure 16.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0528DBVR and MCP1700-2802E/TO, the LD6815TD/28H uniquely balances ultra-high PSRR, low noise, and 3-state disable in a miniature SOT753 package-making it optimal for next-generation mobile RF and imaging subsystems where signal integrity is non-negotiable.

Availability

LD6815TD/28H is available at Aetrix Electronics and suitable for smartphone baseband power, portable media player audio codec supply, and digital still camera image sensor bias requiring stable component supply across high-volume production cycles.

Supply support for LD6815TD/28H 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 consumer markets.

The LD6815 series was designed specifically for ultra-low-noise, high-PSRR power regulation in battery-powered portable electronics-targeting RF, imaging, and audio subsystems where clean, sequenced, and efficient voltage conversion is essential.

FAQ

What is the output voltage tolerance of the LD6815TD/28H over temperature?

The LD6815TD/28H maintains output voltage accuracy within ±2% over the full operating temperature range of −40 °C to +85 °C. At +25 °C, the tolerance tightens to ±0.5%, ensuring precise biasing for analog circuits such as camera sensor references and RF front-end amplifiers. This specification is verified per Table 8 in the official NXP datasheet Rev. 2 (2012).

Does the LD6815TD/28H provide auto-discharge functionality?

No, the LD6815TD/28H does not include auto-discharge. It belongs to the "H" variant (high-ohmic output), which places the OUT pin in a high-impedance (3-state) condition when disabled via the EN pin. For auto-discharge capability, the "P" variant (e.g., LD6815TD/28P) must be selected, which integrates a 100 Ω pull-down transistor to actively discharge the output capacitor.

What is the minimum recommended output capacitance for stable operation of the LD6815TD/28H?

The LD6815TD/28H requires a minimum external output capacitance of 0.7 µF, with 1.0 µF recommended for optimal transient response and PSRR performance. The capacitor must be X7R dielectric, rated for −40 °C to +125 °C, and exhibit ESR between 5 mΩ and 500 mΩ. Ceramic capacitors meeting these criteria ensure loop stability without requiring additional compensation components.

Can the LD6815TD/28H operate from a 2.5 V input while delivering 2.8 V output?

No-the LD6815TD/28H cannot regulate at 2.8 V from a 2.5 V input. Its dropout voltage is 250 mV at 150 mA, meaning the minimum valid input is 3.05 V (2.8 V + 0.25 V). Operation below this violates the recommended input voltage range (2.3–5.5 V) and results in unregulated output. For 2.5 V input, a lower-output LDO (e.g., 2.3 V or 2.5 V variant) or a different topology is required.

Is the LD6815TD/28H RoHS-compliant and halogen-free?

Yes, the LD6815TD/28H is RoHS-compliant and halogen-free per NXP's environmental compliance documentation. It conforms to EU Directive 2011/65/EU (RoHS 2) and satisfies JEDEC J-STD-709B requirements for halogen content. Full material declarations and compliance certificates are available upon request from Aetrix Electronics for qualifying customers.