Monolithic Power Systems Inc. MP8802DJ-2.85-LF-Z

Overview

MP8802DJ-2.85-LF-Z from Monolithic Power Systems is a fixed-output, low-noise, low-dropout linear regulator delivering 2.85V at up to 250mA with ±2% output voltage accuracy, 250mV dropout at full load, and 70dB PSRR at 1kHz. It operates from 2.7V–6.5V input and integrates thermal shutdown protection. It powers noise-sensitive RF and audio circuitry in mobile handsets and 802.11 PC cards.

For engineers reviewing the MP8802DJ-2.85-LF-Z datasheet, MP8802DJ-2.85-LF-Z pinout, MP8802DJ-2.85-LF-Z application, or MP8802DJ-2.85-LF-Z equivalent, key selection criteria include dropout voltage under 250mA load, PSRR performance at 1MHz and 1kHz, ground current stability across load, thermal shutdown threshold, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MP8802DJ-2.85-LF-Z uses a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR. Its internal 1.222V feedback reference and fixed resistor divider set the precise 2.85V output without external components.

It features enable-controlled startup (EN pin), thermal shutdown at 155°C with 30°C hysteresis, and stable operation with ≥2.2μF low-ESR ceramic output capacitance - critical for PLL VCO and audio codec power rails where ripple and transient response directly impact signal integrity.

Key Specifications

Pinout & Package

MP8802DJ-2.85-LF-Z is housed in a 5-pin TSOT23-5 package (2.9mm × 1.6mm × 0.87mm), optimized for space-constrained portable designs and thermally efficient PCB layout with exposed pad grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO applications.

Compared with XC6206P282MR and ADP121-AUJZ-2.85-R7, MP8802DJ-2.85-LF-Z uniquely delivers 250mA continuous current with 70dB PSRR at 1kHz and integrated thermal hysteresis - making it the only option among the three qualified for simultaneous high-current, high-PSRR, and thermally robust operation in mobile RF subsystems.

Availability

MP8802DJ-2.85-LF-Z is available at Aetrix Electronics and suitable for mobile handset PLL power, 802.11 PC card power, and audio codec power applications requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for SMT assembly.

Supply support for MP8802DJ-2.85-LF-Z 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with core expertise in DC/DC converters, LDOs, and motor drivers for consumer, industrial, and automotive markets.

The MP8802 belongs to MPS's ultra-low-noise LDO product line, engineered specifically for powering noise-critical RF and audio subsystems in battery-operated portable electronics where PSRR, dropout, and output stability are non-negotiable.

FAQ

What is the minimum input voltage required for MP8802DJ-2.85-LF-Z to maintain regulation?

The MP8802DJ-2.85-LF-Z requires a minimum input voltage of 3.1V to sustain 2.85V output at 250mA load, based on its 250mV dropout specification. At lighter loads, input can drop to 2.7V while maintaining regulation. Operation below 2.7V violates the absolute minimum input rating and may cause instability or shutdown.

Can the FB pin be left floating in the fixed-output MP8802DJ-2.85-LF-Z?

Yes - the FB pin is internally connected to the fixed resistor divider and must remain unconnected (floating) in fixed-output variants like MP8802DJ-2.85-LF-Z. Connecting external components to FB will disrupt regulation and is explicitly prohibited in the datasheet.

Does MP8802DJ-2.85-LF-Z require an external feed-forward capacitor for stability?

No - the MP8802DJ-2.85-LF-Z is internally compensated and stable with standard 2.2μF ceramic output capacitance. An external feed-forward capacitor between FB and OUT is optional and only recommended to improve transient response in adjustable configurations; it is unnecessary and unused in this fixed-voltage variant.

What is the thermal resistance θJA for MP8802DJ-2.85-LF-Z in standard PCB layout?

The junction-to-ambient thermal resistance (θJA) for MP8802DJ-2.85-LF-Z in a standard 4-layer JEDEC PCB layout is 220°C/W. This value assumes recommended copper pour area under the exposed pad and proper via placement; actual θJA improves significantly with enhanced thermal land design per the datasheet layout guidelines.

Is MP8802DJ-2.85-LF-Z compatible with ceramic capacitors having X5R dielectric?

Yes - the MP8802DJ-2.85-LF-Z is fully compatible with X5R ceramic capacitors ≥2.2μF at the output. The device's internal compensation ensures stability across the capacitance and ESR range typical of X5R types, eliminating need for series resistors or specialized capacitor families.

How does the EN pin behave during power-up if tied directly to IN?

When EN is tied to IN, the MP8802DJ-2.85-LF-Z enables automatically once IN reaches ~1.5V (EN high threshold). This provides seamless, monotonic power-up without external sequencing circuitry - ideal for simple point-of-load applications where controlled startup timing is not required.

What is the maximum allowable power dissipation at +85°C ambient?

At TA = +85°C, maximum continuous power dissipation is calculated as PD(MAX) = (TJ(MAX) − TA)/θJA = (125°C − 85°C)/220°C/W ≈ 182mW. Exceeding this causes thermal shutdown; derating is required for sustained 250mA loads at elevated ambient temperatures.