Monolithic Power Systems Inc. MP2240GJ-P

Overview

MP2240GJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 80mΩ/30mΩ MOSFETs, delivering 3A continuous output current across 6V–16V input and adjustable 0.8V–14.4V output. It operates at fixed 800kHz switching frequency with current-mode control, thermal shutdown, over-current hiccup protection, and external soft-start/AAM programming-used in notebook I/O power rails requiring compact, high-efficiency regulation.

For engineers reviewing the MP2240GJ-P datasheet, MP2240GJ-P pinout, MP2240GJ-P application, or MP2240GJ-P equivalent, key selection criteria include verified 3A load capability at 12V_IN, 800kHz fixed-frequency operation for EMI predictability, TSOT-23-8 package thermal performance (θ_JA = 100°C/W), and feedback reference accuracy (791–823mV).

Technical Context

The MP2240GJ-P employs peak-current-mode control with an internal 0.807V reference and error amplifier driving a COMP node to regulate output voltage via duty-cycle modulation. Its fixed-frequency oscillator initiates PWM cycles, while cycle-by-cycle current limiting triggers hiccup mode during sustained overloads.

It integrates a 5V internal LDO (VCC) powered from VIN, bootstrap circuitry for high-side gate drive, and AAM pin-controlled asynchronous modulation to optimize light-load efficiency. UVLO activates at 4.9V (rising) with 1.1V hysteresis, and thermal shutdown engages at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MP2240GJ-P is housed in an 8-pin TSOT-23 package with exposed thermal pad (JEDEC MO-193BA), optimized for low θ_JA (100°C/W) on standard 4-layer PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2240GJ-P, MP2315GJ-Z offers higher current headroom and lower conduction loss but sacrifices switching frequency flexibility, while TPS563201DDF provides simpler layout (6-pin) and faster transient response but lacks AAM-based efficiency optimization at light loads.

Availability

MP2240GJ-P is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box SoC supplies, flat-panel monitor logic rails, and distributed telecom power nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MP2240GJ-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP2240 belongs to MPS's high-efficiency synchronous buck converter product line, designed specifically for space-constrained consumer and computing systems needing integrated power stages, programmable light-load behavior, and robust protection in ultra-small packages.

FAQ

What is the minimum recommended output capacitor value for stable operation?

The MP2240GJ-P requires ≥22μF ceramic output capacitance with X5R/X7R dielectric for stable regulation at 3A load. Lower values risk instability due to insufficient phase margin; the internal compensation is optimized for 22–47μF range with ≤5mΩ ESR. Using <10μF risks audible switching noise and output overshoot during load transients.

Can the MP2240GJ-P operate with a 5V input supply?

No-MP2240GJ-P has a 6V minimum input voltage due to its internal UVLO threshold of 4.9V (rising) and requirement for sufficient headroom to sustain the 5V VCC LDO. At 5V input, the VCC rail drops below regulation, disabling control circuitry and causing startup failure or erratic operation.

How does the AAM pin affect efficiency versus output ripple?

Driving AAM to 0.3V–0.5V enables asynchronous mode below ~300mA load, improving light-load efficiency by 8–12% but increasing output ripple by 2–3× compared to CCM. Higher AAM voltages (>0.6V) force continuous conduction mode, reducing ripple to <15mVpp but lowering efficiency by ~5% at 50mA load.

Is an external bootstrap diode required for reliable operation?

An external bootstrap diode (e.g., 1N4148) is optional but recommended when duty cycle exceeds 65% (e.g., 5V_OUT from 12V_IN) to maintain BST voltage above 2.2V UVLO threshold. Without it, bootstrap capacitor discharge may cause high-side driver dropout, leading to increased switching loss and thermal stress.

What is the maximum allowable PCB trace length between FB and the output resistor divider?

FB trace length must be ≤2mm with no vias to minimize noise coupling and parasitic capacitance. Longer traces introduce phase lag that degrades loop stability and causes oscillation at ~200kHz; the 10–50nA FB bias current makes the node highly susceptible to EMI from SW/BST routing.

Does the MP2240GJ-P support parallel operation for higher current?

No-MP2240GJ-P lacks current-sharing pins or synchronization inputs. Parallel connection causes unequal current distribution due to mismatched R_DS(on) and propagation delays, risking thermal runaway in one device. For >3A, use MP2315GJ-Z or multi-phase controllers like MP8765.

What thermal derating applies above 85°C ambient temperature?

At 100°C ambient, maximum continuous output current derates to 2.2A (27% reduction) based on θ_JA = 100°C/W and 150°C max junction temperature. Derating follows linear interpolation: I_OUT(T_A) = 3A × (1 − (T_A − 25)/125). Forced airflow improves this by up to 35%.