Monolithic Power Systems Inc. MP8801DJ-2.85-LF-P

Overview

MP8801DJ-2.85-LF-P from Monolithic Power Systems is a fixed-output, low-noise, low-dropout linear regulator delivering 2.85V at up to 150mA with ±2% accuracy over −40°C to +85°C. It operates from 2.7V–6.5V input, features 70dB PSRR at 1kHz, and uses a PMOS pass element for stable low-ESR capacitor compatibility. It powers noise-sensitive RF and audio blocks in mobile handsets.

For engineers reviewing the MP8801DJ-2.85-LF-P datasheet, MP8801DJ-2.85-LF-P pinout, MP8801DJ-2.85-LF-P application, or MP8801DJ-2.85-LF-P equivalent, key selection criteria include dropout voltage (150mV @ 150mA), ground current (125μA), thermal shutdown threshold (155°C), FB regulation (1.222V), and TSOT23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MP8801DJ-2.85-LF-P integrates an internal resistor divider to fix VOUT at 2.85V while retaining full adjustability via external FB network (1.25V–5V). Its PMOS pass transistor enables ultra-low dropout and eliminates reverse-current risk during input transients.

It delivers high power supply rejection-70dB at 1kHz and 30dB at 1MHz-with 300nV/√Hz output voltage noise, making it suitable for powering PLL VCOs and audio codec analog rails where supply-induced jitter or distortion must be minimized.

Key Specifications

Pinout & Package

MP8801DJ-2.85-LF-P is housed in a 5-pin TSOT23-5 package (2.9mm × 1.6mm × 0.95mm height) with exposed thermal pad connected to GND for enhanced thermal dissipation. The package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B285MR-G and ADP125ARHZ-2.85-R7, MP8801DJ-2.85-LF-P uniquely balances 150mA capability, 300nV/√Hz noise, 70dB PSRR, EN control, and thermal protection in a compact TSOT23-5 package-making it optimal for RF and audio subsystems where noise, size, and functional safety are co-prioritized.

Availability

MP8801DJ-2.85-LF-P is available at Aetrix Electronics and suitable for mobile handset RF power, 802.11 PC card regulation, and audio codec analog rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP8801DJ-2.85-LF-P 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 power management ICs, including DC/DC converters, LDOs, LED drivers, and motor drivers for consumer, industrial, and automotive markets.

The MP8801 series was designed specifically for noise-critical analog and RF subsystems in portable wireless devices, emphasizing ultra-low output noise, high PSRR, and minimal solution footprint.

FAQ

What is the minimum input voltage required for regulation at 2.85V output?

The MP8801DJ-2.85-LF-P maintains regulation down to VIN = VOUT + dropout voltage. With 150mV dropout at 150mA, the minimum input is 3.0V. At lighter loads, dropout decreases-e.g., 100mV at 100mA yields a 2.95V minimum input. Input must remain ≥2.7V per absolute rating.

Can the MP8801DJ-2.85-LF-P be used in adjustable-output mode?

Yes. Though configured for 2.85V output, the FB pin remains accessible. By disconnecting the internal divider and connecting an external R1/R2 network (with R2 = 10kΩ ±1%), VOUT can be set from 1.25V to 5V using VOUT = 1.222V × (1 + R1/R2). R1 + R2 should be ≤100kΩ for accuracy.

Is a feed-forward capacitor required for stability?

No. The MP8801DJ-2.85-LF-P is stable with standard 1μF–10μF X5R/X7R ceramic output capacitors and does not require a feed-forward capacitor. However, adding a 100nF ceramic capacitor in parallel with R1 improves transient response in adjustable configurations-this is optional, not mandatory.

What thermal derating applies in a 4-layer PCB layout?

With θJA = 220°C/W on a JEDEC 4-layer board, maximum continuous power dissipation at 25°C ambient is PD(MAX) = (125°C − 25°C)/220°C/W ≈ 455mW. At 150mA and 3.0V dropout, power dissipation is 450mW-near limit. Reduce load or improve copper area if ambient exceeds 25°C.

Does the EN pin have internal pull-up or pull-down?

No. The EN pin has no internal pull-up or pull-down. It must be actively driven: ≥1.5V to enable, ≤0.4V to disable. For automatic startup, connect EN directly to IN. For controlled sequencing, drive EN from a GPIO or power-good signal with <1μA leakage.

How does the 1.222V FB threshold affect output accuracy?

The 1.222V feedback reference has ±0.025V tolerance (1.197V–1.246V) at 25°C, contributing directly to output error in adjustable mode. In fixed 2.85V mode, internal resistor matching dominates accuracy (±2%), making FB tolerance irrelevant unless externally modified.

Are there layout recommendations for minimizing noise coupling?

Yes. Place 1μF IN and OUT capacitors within 2mm of their respective pins; route FB traces short and away from noisy signals; connect GND pins directly to a solid ground plane; and use thermal pad (pin 2) as primary GND return path to reduce impedance and improve PSRR.