Monolithic Power Systems Inc. MP2313GJ-P

Overview

MP2313GJ-P from Monolithic Power Systems is a high-frequency synchronous step-down DC/DC converter with integrated 110mΩ/50mΩ MOSFETs, delivering 1A continuous output current across a 4.5V–24V input range, fixed 2MHz switching frequency, and adjustable 0.8V–VIN×0.83 output voltage - deployed in notebook I/O power rails and flat-panel display bias supplies.

For engineers reviewing the MP2313GJ-P datasheet, MP2313GJ-P pinout, MP2313GJ-P application, or MP2313GJ-P equivalent, key selection criteria include AAM light-load mode behavior, TSOT23-8 thermal performance under 1A load, 1.5ms internal soft-start timing, and EN pin's 1.4V rising threshold with 150mV hysteresis for reliable enable sequencing.

Technical Context

The MP2313GJ-P operates in peak-current-mode control with fixed 2MHz oscillator, enabling fast transient response and simplified loop compensation. Its internal error amplifier compares FB voltage against a trimmed 798mV reference, generating COMP voltage to regulate high-side MOSFET on-time.

AAM (Advanced Asynchronous Modulation) dynamically shifts operation between PWM and PFM modes based on load: a resistor from AAM pin to GND sets the transition threshold via a 6.2μA internal current source, while hiccup-mode OCP activates when FB drops below 400mV for >100ns, reducing average short-circuit current.

Key Specifications

Pinout & Package

MP2313GJ-P is housed in a thermally enhanced TSOT23-8 package with 0.65mm pitch, requiring exposed pad soldering for optimal θJA = 100°C/W performance. Pin 1 (AAM) controls light-load modulation; Pin 5 (BST) supplies floating gate drive for the high-side MOSFET.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT6220AGQW and TPS62130ARGTR, MP2313GJ-P delivers optimal balance of 1A capability, ultra-compact TSOT23-8 footprint, and configurable AAM mode - making it ideal for space-limited, cost-sensitive 12–24V input systems where 2MHz operation and minimal external components are critical.

Availability

MP2313GJ-P is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box SoC core supplies, flat panel display bias rails, and industrial sensor node power conversion requiring stable component supply across multi-year production cycles.

Supply support for MP2313GJ-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, headquartered in Kirkland, Washington, with global design and support centers.

The MP2313 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for compact, efficient point-of-load regulation in consumer, computing, and industrial equipment operating from 4.5V–24V inputs.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2313GJ-P requires ≥22μF ceramic output capacitance with X5R/X7R dielectric for stable regulation at 1A load. Lower values risk instability due to insufficient phase margin; ESR must be ≤10mΩ for full 2MHz bandwidth support. Layout proximity to FB pin is critical - place capacitor within 3mm of pins 4 and 8.

Can the MP2313GJ-P operate with an input voltage below 4.5V?

No - the absolute minimum operating input is 4.5V per datasheet specifications. Below this, UVLO disables the internal regulator and prevents startup. The 3.9V UVLO rising threshold ensures reliable turn-on only when VIN exceeds 4.5V, preventing erratic behavior during brownout conditions.

How does the AAM pin affect light-load efficiency and output ripple?

A lower AAM voltage (via larger R_AAM) extends PFM mode deeper into light load, improving efficiency but increasing output ripple due to variable-frequency operation. Higher AAM voltage narrows PFM range, reducing ripple but degrading efficiency below ~100mA. Optimal R_AAM balances both - typically 100kΩ for 3.3V outputs.

Is an external bootstrap diode required for all applications?

An external bootstrap diode (e.g., IN4148) is recommended only when duty cycle exceeds 65% - i.e., V_OUT/V_IN > 0.65 - such as 5V output from 7V input. It prevents BST capacitor discharge during high-duty cycles, sustaining gate drive strength and minimizing HS MOSFET conduction loss.

What is the maximum allowable junction temperature during continuous 1A operation?

The MP2313GJ-P thermal shutdown triggers at 150°C junction temperature, with 20°C hysteresis. Under typical PCB conditions (4-layer, 1-in² copper), continuous 1A operation at 24V input reaches ~115°C junction temp - well within safe margin. Derating is required above 85°C ambient unless thermal pad is fully soldered to inner ground plane.

Does the FB pin require external compensation components?

No - the MP2313GJ-P features fully internal compensation optimized for standard 1μH inductors and 22μF ceramic output capacitors. Adding external RC networks destabilizes the control loop; only the feedback resistor divider (R1/R2) is required to set VOUT, per equation R2 = R1 × (0.798V / (VOUT − 0.798V)).

How does hiccup-mode OCP behave during a sustained output short?

When FB drops below 400mV for >100ns, the MP2313GJ-P enters hiccup mode: it disables switching for ~10ms, then attempts restart. This limits average power dissipation to ~0.5W during short-circuit, preventing thermal damage. Recovery occurs automatically once the short is removed and FB rises above 400mV.