Monolithic Power Systems Inc. MP2151GTF-15-P

Overview

MP2151GTF-15-P from Monolithic Power Systems is a fixed-output 1.5V, 1A synchronous step-down DC/DC converter with 25μA quiescent current, constant-on-time (COT) control, and integrated 80mΩ/50mΩ MOSFETs. It operates from 2.5V–5.5V input, delivers ±1% output accuracy over temperature, and includes output discharge, OVP, SCP, and thermal shutdown-designed for space-constrained battery-powered devices requiring stable low-voltage rail generation.

For engineers reviewing the MP2151GTF-15-P datasheet, MP2151GTF-15-P pinout, MP2151GTF-15-P application, or MP2151GTF-15-P equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for low-I_Q buck conversion in portable and I/O power systems.

Technical Context

The MP2151GTF-15-P implements a constant-on-time (COT) control architecture with input voltage feed-forward, enabling fast transient response and stable 1.1MHz switching across its 2.5V–5.5V input range. Its internal high-side P-channel and low-side N-channel MOSFETs (80mΩ/50mΩ R_DS(ON)) eliminate external switch requirements and support 100% duty-cycle operation for ultra-low dropout.

It integrates a dedicated power-good (PG) open-drain output with ±10%/+15% regulation window, output discharge via internal 200Ω resistor when disabled, and hiccup-mode short-circuit protection triggered at ≥1.8A peak switch current. The fixed 1.5V output is trimmed to 1485–1515mV at 25°C (±1% FB reference of 600mV).

Key Specifications

Pinout & Package

SOT563 package (1.6mm × 1.6mm × 0.55mm), thermally enhanced with exposed pad; pin-compatible with MP2151GTF-12/-18/-25/-33 variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output buck converter applications.

Compared with TPS62231DRYR and ADP2119ACPZ-R7, MP2151GTF-15-P uniquely combines fixed 1.5V output, integrated PG, output discharge, and COT control in SOT563-making it optimal for space- and power-constrained portable systems requiring autonomous power management.

Availability

MP2151GTF-15-P is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, low-voltage I/O interfaces, and multi-function printer ASIC supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2151GTF-15-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, with design focus on efficiency, integration, and miniaturization for portable, automotive, and industrial applications.

The MP2151 product line targets ultra-compact, low-quiescent-current DC/DC conversion for battery-powered and energy-sensitive systems-emphasizing minimal external components, robust protection, and seamless power sequencing.

FAQ

What is the maximum recommended PCB trace length between MP2151GTF-15-P and the output capacitor?

Maximum trace length from OUT and GND pins to the output capacitor should not exceed 3mm. Longer traces increase parasitic inductance, degrading transient response and potentially causing output voltage overshoot during load steps. Use wide, short copper pours and place the 10–22μF ceramic capacitor directly adjacent to the OUT and GND pins with minimum via count.

Does MP2151GTF-15-P require an external pull-up resistor on the PG pin?

Yes. The PG pin is open-drain and requires an external pull-up resistor (100–500kΩ) to either VIN or VOUT. A 220kΩ resistor is recommended for optimal noise immunity and rise time. Without this resistor, PG remains floating and cannot assert a valid logic-high signal to downstream reset controllers.

Can MP2151GTF-15-P operate with a 2.4V input supply?

No. The absolute minimum input voltage is 2.5V, and the under-voltage lockout (UVLO) rising threshold is 2.3–2.45V. At 2.4V, the device may not start or could cycle unpredictably. For 2.4V sources, consider using MP2151GTF (adjustable version) with external feedback or a different regulator rated down to 2.0V.

How does the output discharge function behave during EN deactivation?

When EN is pulled low or floats, the internal 200Ω discharge MOSFET activates immediately, sinking current from the output capacitor to GND. This discharges a typical 22μF output cap from 1.5V to <100mV in <1ms-ensuring safe, controlled power-down without residual voltage holding up downstream logic states.

Is thermal derating required for continuous 1A operation in SOT563 package?

Yes. At ambient temperatures above +60°C, output current must be derated per θ_JA = 80°C/W. With 1.5W max power dissipation, junction temperature rises ~8°C at 1A (assuming 0.15V dropout × 1A = 150mW). Full 1A is sustainable up to +115°C ambient, but PCB copper area and airflow should be verified per JEDEC JESD51-7 test conditions.

What is the purpose of the 100ns minimum off-time specification?

The 100ns minimum off-time prevents inductor current runaway during large load transients by enforcing a lower bound on switching period. It ensures the low-side MOSFET remains on long enough to fully demagnetize the inductor, maintaining stability in COT control and avoiding subharmonic oscillation at light loads.

Does MP2151GTF-15-P support forced PWM mode?

No. MP2151GTF-15-P operates exclusively in automatic COT mode with AAM (asynchronous modulation) at light loads. It lacks a MODE pin or external control to force continuous PWM; instead, it transitions seamlessly between CCM, DCM, and sleep mode based on load current and output ripple.