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

Overview

MP20249DC-MC-LF-Z from Monolithic Power Systems is a dual-channel, ultra-low-noise linear regulator with fixed 2.8V and 1.2V outputs, 1% accuracy, 200mA per channel output capability, 16µV_RMS output noise (100Hz–1kHz), and 65dB PSRR at 1kHz-designed for powering noise-sensitive analog/RF blocks in battery-powered mobile devices.

For engineers reviewing the MP20249DC-MC-LF-Z datasheet, MP20249DC-MC-LF-Z pinout, MP20249DC-MC-LF-Z application, or MP20249DC-MC-LF-Z equivalent, key selection criteria include dual independent enable control, WLCSP-6 package footprint constraints, dropout voltage ≤75mV at full load, output discharge functionality, and stability with 1µF ceramic capacitors without external bypass.

Technical Context

The MP20249 employs internal P-channel MOSFET pass elements enabling low dropout (60mV @150mA) and near-zero quiescent current in shutdown (0.12µA). Its architecture integrates two independent error amplifiers, reference filters, and thermal/current protection circuits per channel, with no shared bias or feedback paths.

Each LDO features dedicated EN pins (EN1/EN2), independent output discharge MOSFETs, and separate 50pF internal bypass structures that eliminate need for external bypass capacitors while achieving 16µV_RMS noise-critical for RF front-end and precision ADC supply rails.

Key Specifications

Pinout & Package

MP20249DC-MC-LF-Z is housed in a 1.0mm × 1.5mm, 6-ball WLCSP (Wafer-Level Chip Scale Package) with 0.4mm pitch and bottom-side solder balls. The package supports automated reflow assembly and provides minimal PCB footprint for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6223D2812MR-G and RP512L2812-AE, MP20249DC-MC-LF-Z uniquely delivers 16µV_RMS noise with zero external bypass, independent EN control in smallest WLCSP-6 footprint, and guaranteed 1µF stability-making it optimal for next-gen compact RF/analog systems where noise, size, and sequencing matter most.

Availability

MP20249DC-MC-LF-Z is available at Aetrix Electronics and suitable for cellular mobile phones, digital cameras, wireless LAN modules, and post DC-to-DC regulation applications requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for SMT production.

Supply support for MP20249DC-MC-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 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 space-constrained, battery-powered applications demanding sub-20µV_RMS noise, dual-rail independence, and minimal external components.

FAQ

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

The absolute minimum input voltage is 2.3V per the datasheet, but functional regulation requires VIN ≥ VOUT + 0.5V. For this part (2.8V/1.2V outputs), stable operation begins at VIN ≥ 3.3V for Channel 1 and VIN ≥ 1.7V for Channel 2-however, both channels require VIN ≥ 3.3V to avoid dropout on the 2.8V rail. Below 3.3V, only the 1.2V channel remains regulated until VIN drops below 1.7V.

Does MP20249DC-MC-LF-Z require external bypass capacitors to achieve its specified 16µV_RMS noise?

No. The 16µV_RMS noise specification is measured with no external bypass capacitor-enabled by an integrated 50pF internal filter structure per channel. Adding external bypass caps does not improve noise performance and may destabilize the loop if improperly sized or placed.

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

Only the disabled channel activates its internal 80Ω discharge path. When EN1 is low and EN2 is high, VOUT1 discharges rapidly while VOUT2 remains regulated and unaffected. This behavior is confirmed in the "Operation" section and validated in typical performance curves showing independent channel shutdown waveforms.

Can MP20249DC-MC-LF-Z be used with input voltages above 6.0V?

No. The absolute maximum input voltage is 6.5V, but the recommended operating range ends at 6.0V. Exceeding 6.0V risks violating SOA limits-even briefly-due to increased power dissipation in the P-MOSFET pass devices. At VIN = 6.5V and IOUT = 200mA, power dissipation exceeds 700mW, triggering thermal shutdown in the WLCSP-6 package.

What is the thermal resistance (θ_JA) of MP20249DC-MC-LF-Z in standard PCB layout?

The datasheet specifies θ_JA = 250°C/W for the WLCSP-6 package on a 4-layer JEDEC-standard PCB (JESD51-7). This value assumes 1-inch² copper pour under the package and 2oz copper layers. Without thermal vias or enhanced ground planes, actual θ_JA may exceed 300°C/W, limiting continuous 200mA operation above 60°C ambient.

Is MP20249DC-MC-LF-Z compatible with 0.9V GPIOs for enable control?

No. The EN input low threshold (V_IL) is 0.4V max, and high threshold (V_IH) is 1.2V min. A 0.9V GPIO cannot reliably assert EN high-it falls within the undefined logic region (0.4V–1.2V) and may cause erratic channel enable/disable behavior. Minimum recommended EN drive is 1.2V for logic high.

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

No. MP20249DC-MC-LF-Z is a fixed-output device with factory-trimmed 2.8V and 1.2V channels. MPS offers adjustable variants (e.g., MP20249DN) in different packages, but this specific part number has no external feedback pins or resistor-divider interface-output voltages are laser-trimmed during wafer test.