Monolithic Power Systems Inc. MP20249DC-MC-LF-P

Overview

MP20249DC-MC-LF-P from Monolithic Power Systems is a dual-channel, ultra-low-noise, high-PSRR linear regulator with fixed 2.8V and 1.2V outputs, ±1% accuracy, 75mV dropout at 200mA per channel, and 16µV_RMS output noise (100Hz–1kHz) without bypass capacitors. It delivers up to 200mA per LDO from a 2.3V–6.0V input and targets noise-sensitive analog rails in compact battery-powered systems.

For engineers reviewing the MP20249DC-MC-LF-P datasheet, MP20249DC-MC-LF-P pinout, MP20249DC-MC-LF-P application, or MP20249DC-MC-LF-P equivalent, key selection criteria include dual independent enable control, WLCSP package footprint constraints, low-noise performance under light-to-full load, PSRR above 65dB at 1kHz, and output discharge functionality for rapid rail collapse.

Technical Context

The MP20249 integrates two independent P-channel MOSFET-based LDOs with separate EN1/EN2 inputs, internal 50pF noise-reduction capacitance per channel, and active pull-down circuitry enabling fast output discharge. Each regulator features dedicated current-limit and thermal shutdown circuits with 150°C trip point and 15°C hysteresis.

It operates with 1µF ceramic output capacitors across full load range (1mA–200mA), achieves 65dB PSRR at 1kHz and 55dB at 100kHz, and maintains stable regulation down to 2.3V input-enabling use after buck converters or directly from single-cell Li-ion batteries.

Key Specifications

Pinout & Package

MP20249DC-MC-LF-P uses a 1.0mm × 1.5mm, 6-ball WLCSP (Wafer-Level Chip Scale Package) with 0.4mm pitch and bottom-side solder balls. The package is optimized for minimal PCB area and thermal performance via direct die attachment to board copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6223D2812MR-G and RP512L2812-TR, MP20249DC-MC-LF-P uniquely combines independent enable control, integrated output discharge, lowest noise (16µV_RMS), and highest PSRR (65dB) in a 1.0×1.5mm WLCSP-making it optimal for space- and noise-constrained dual-rail portable designs.

Availability

MP20249DC-MC-LF-P is available at Aetrix Electronics and suitable for cellular mobile phones, digital cameras, handheld medical sensors, wireless LAN modules, and post-DC/DC regulation requiring stable component supply across extended production lifecycles.

Supply support for MP20249DC-MC-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP20249 belongs to MPS's ultra-low-noise LDO product line, engineered specifically for noise-critical, space-constrained applications in mobile, imaging, and wireless infrastructure where PSRR, output stability, and package size are primary constraints.

FAQ

What is the minimum input voltage required for MP20249DC-MC-LF-P to regulate both outputs?

The MP20249DC-MC-LF-P requires a minimum input voltage of 2.3V to maintain regulation across its full operating temperature range (−40°C to +85°C). At 2.3V input, the 2.8V output cannot be sustained-but the 1.2V output remains functional with sufficient headroom. For simultaneous 2.8V/1.2V operation, VIN must be ≥3.3V to satisfy the 75mV dropout requirement on the higher rail.

Can MP20249DC-MC-LF-P operate with zero external capacitors?

No. While the device achieves ultra-low noise without external bypass capacitors, it requires ≥1µF ceramic capacitors on both VOUT1 and VOUT2 for stability across all loads, and a ≥1µF capacitor on VIN for input filtering and transient response. Omitting these violates the stability criteria defined in the datasheet and risks oscillation or poor load regulation.

How does the output discharge function behave when only one channel is disabled?

Only the disabled channel activates its internal 80Ω discharge FET-VOUT2 discharges independently when EN2 is low, while VOUT1 remains regulated if EN1 is high. This behavior is confirmed in the "Operation" section and typical performance curves showing individual channel shutdown waveforms.

Is MP20249DC-MC-LF-P RoHS compliant and halogen-free?

Yes. The "-LF" suffix in MP20249DC-MC-LF-P explicitly denotes lead-free and RoHS-compliant packaging per JEDEC J-STD-609. The device meets IPC-1752A material declaration requirements and contains no brominated flame retardants or chlorine-based compounds.

What thermal derating applies to MP20249DC-MC-LF-P at 85°C ambient?

With θ_JA = 250°C/W, the maximum continuous power dissipation at T_A = 85°C is calculated as (125°C − 85°C)/250°C/W = 160mW. For V_IN = 4.2V and V_OUT1 = 2.8V delivering 200mA, power dissipation is (4.2 − 2.8) × 0.2 = 280mW-exceeding the limit. Derating requires reducing load current or improving PCB thermal design (e.g., added copper area) to maintain T_J ≤ 125°C.

Does MP20249DC-MC-LF-P support adjustable output voltages?

No. MP20249DC-MC-LF-P is a fixed-output device with factory-trimmed 2.8V and 1.2V channels. Adjustable versions (e.g., MP20249DN) exist but require external feedback resistors and are not pin-compatible. The "MC" in the part number denotes the specific 2.8V/1.2V configuration.