Monolithic Power Systems Inc. MP21148GQD-P

Overview

MP21148GQD-P from Monolithic Power Systems is a monolithic synchronous step-down DC/DC converter with integrated 120mΩ P-channel and 80mΩ N-channel MOSFETs, delivering up to 1A continuous output current from 2.3V–5.5V input while regulating output down to 0.6V. It employs constant-on-time control in forced CCM for fast transient response, low output ripple, and stable operation with ceramic capacitors - ideal for powering low-voltage I/O rails in portable and wearable devices.

For engineers reviewing the MP21148GQD-P datasheet, MP21148GQD-P pinout, MP21148GQD-P application, or MP21148GQD-P equivalent, key selection considerations include its 2.4MHz switching frequency, EN-controlled power sequencing, 100% duty cycle capability, output discharge function, and QFN-6 (1.0mm×1.5mm) ultra-small footprint for space-constrained designs.

Technical Context

The MP21148GQD-P uses a constant-on-time (COT) control architecture with input voltage feed-forward to maintain near-constant 2.4MHz switching frequency across input (2.3V–5.5V) and output (0.6V–VIN) ranges. Its internal high-side P-FET and low-side N-FET switches enable synchronous rectification without external diodes.

It integrates soft-start (0.5ms), hiccup-mode short-circuit protection, thermal shutdown (160°C), and under-voltage lockout (2.25V rising threshold with 150mV hysteresis). The FB pin senses output via resistor divider with 600mV ±6mV reference, and the OUT pin provides both output power rail and input sense for accurate regulation.

Key Specifications

Pinout & Package

MP21148GQD-P is housed in an ultra-compact QFN-6 package (1.0mm × 1.5mm, 0.4mm height) with exposed thermal pad for enhanced power dissipation. The package complies with JEDEC MO-220 and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with TPS62130ARGTR and RT7295BGJ6F, MP21148GQD-P uniquely combines 1A capability, output discharge, 2.4MHz operation, and QFN-6 size - making it optimal for space- and safety-critical portable systems where controlled shutdown and minimal footprint are mandatory.

Availability

MP21148GQD-P is available at Aetrix Electronics and suitable for wireless networking cards, portable medical sensors, and battery-powered wearables requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP21148GQD-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 MP21148 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for compact, battery-operated systems demanding high efficiency, fast transient response, and minimal external component count.

FAQ

What is the minimum input voltage required for MP21148GQD-P to regulate a 1.2V output?

The MP21148GQD-P requires a minimum input voltage of 2.3V to operate, regardless of output voltage setting. At 1.2V output, it maintains regulation down to ~2.4V input due to internal headroom and MOSFET R_DS(on) drop - confirmed by datasheet operating conditions and typical performance curves.

Does MP21148GQD-P support forced PWM mode, or is it strictly CCM-only?

The MP21148GQD-P operates exclusively in forced Continuous Conduction Mode (CCM) using constant-on-time control. It does not support discontinuous conduction mode (DCM) or pulse-frequency modulation (PFM); this ensures consistent 2.4MHz switching and predictable EMI behavior across all load conditions.

How does the output discharge function behave during EN deactivation?

When EN is pulled low or left floating, the MP21148GQD-P disables switching and activates an internal 1kΩ discharge path between OUT and GND. This safely discharges output capacitance within milliseconds - verified by electrical characteristics table (R_DIS = 1kΩ) and operation section describing automatic discharge on disable.

Can MP21148GQD-P drive a 10µH inductor, or is 1µH mandatory?

The MP21148GQD-P is optimized for 0.47µH–2.2µH inductors per datasheet recommendations. A 10µH inductor would cause excessive peak current, poor transient response, and potential instability - the 2.4MHz switching frequency and COT architecture require low-inductance values to maintain control loop integrity.

Is the QFN-6 (1.0mm×1.5mm) package of MP21148GQD-P lead-free and RoHS-compliant?

Yes - the MP21148GQD-P uses a lead-free, halogen-free QFN-6 package fully compliant with EU RoHS Directive 2011/65/EU, as explicitly stated in the "All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive" notice on page 1 of the datasheet.

What thermal derating applies above +85°C ambient temperature?

With θ_JA = 220°C/W (QFN-6, 4-layer PCB), the MP21148GQD-P delivers full 1A output up to +85°C ambient. Above that, output current must be linearly reduced: at +105°C ambient, max continuous current drops to ~0.73A; thermal shutdown triggers at +125°C junction temperature, per absolute maximum ratings.

Does MP21148GQD-P require an external bootstrap capacitor?

No - the MP21148GQD-P uses a charge-pump-based gate driver for its internal high-side P-channel MOSFET, eliminating the need for an external bootstrap capacitor. This simplifies layout and reduces BOM count, as confirmed by block diagram (no bootstrap node shown) and absence of bootstrap pin in pin functions table.