Monolithic Power Systems Inc. MPQ2314GJ-P

Overview

MPQ2314GJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 120mΩ high-side and 50mΩ low-side MOSFETs, delivering 2A continuous output current across 4.5V–24V input range. It operates at fixed 500kHz switching frequency (syncable 200kHz–2MHz), supports AAM power-save mode, and regulates output voltage down to 0.8V in notebook I/O and flat-panel display power rails.

For engineers reviewing the MPQ2314GJ-P datasheet, MPQ2314GJ-P pinout, MPQ2314GJ-P application, or MPQ2314GJ-P equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and protection behavior, and real-world design constraints for compact 2A buck conversion in space-constrained industrial and consumer systems.

Technical Context

The MPQ2314GJ-P implements peak-current-mode control with internal 0.8V reference and optimized compensation, enabling stable regulation without external loop components. Its AAM (Advanced Asynchronous Modulation) logic uses an internal 6.2μA current source and user-set resistor on AAM pin to dynamically transition between CCM and PFM modes based on load and COMP voltage thresholds.

Bootstrap operation relies on external BST capacitor and internal floating driver with UVLO (2.2V rising threshold, 150mV hysteresis); EN/SYNC pin serves dual function-digital enable control and external clock synchronization up to 2MHz-with defined pulse width limits (high <1.6μs, low <6μs) to prevent unintended switching.

Key Specifications

Pinout & Package

MPQ2314GJ-P is housed in an 8-pin TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density PCB layouts with exposed thermal pad (GND-connected). Pin 1 is marked by dot; pin numbering follows standard counter-clockwise orientation from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MP2314GJ-Z, MPQ2314GJ-P offers identical performance in sample-friendly packaging; versus TPS54202HDDCR, it delivers higher integration (no external FETs), lower quiescent current, and built-in AAM - reducing total solution size by 40% and simplifying layout for space-constrained embedded systems.

Availability

MPQ2314GJ-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 industrial HMI panels requiring stable component supply across long-lifecycle production runs.

Supply support for MPQ2314GJ-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 interface applications.

The MPQ2314 belongs to MPS's MPQ-series of integrated synchronous buck converters, designed specifically for compact, high-efficiency DC/DC conversion in consumer, computing, and industrial edge devices where thermal and board-area constraints dominate.

FAQ

What is the maximum recommended output current for MPQ2314GJ-P at 24V input?

The MPQ2314GJ-P delivers 2A continuous output current across its full 4.5V–24V input range. At 24V input, thermal performance depends on PCB copper area and airflow; with 2oz copper and 1in² thermal pad, it sustains 2A at ambient ≤65°C per datasheet Figure 11. Derating to 1.6A is advised above 85°C ambient.

Can MPQ2314GJ-P operate without an external bootstrap diode?

Yes - the MPQ2314GJ-P uses internal bootstrap charging via the SW–BST path and does not require an external diode. An external Schottky diode (e.g., IN4148) is optional only when VOUT ≥5V and duty cycle >65% to improve high-side gate drive efficiency and reduce BST capacitor stress.

How is the AAM threshold voltage set, and what resistor value yields 0.6V?

The AAM pin has an internal 6.2μA current source. To set VAAM = 0.6V, use R = 0.6V / 6.2μA ≈ 96.8kΩ - a standard 97.6kΩ (1%) resistor achieves 0.605V. This value balances light-load efficiency and transient response for 5V output applications per Figure 6 in the datasheet.

What is the minimum output voltage achievable with MPQ2314GJ-P?

The MPQ2314GJ-P supports output voltages down to 0.8V, set by the internal 0.791V feedback reference and external resistor divider. The FB pin voltage is trimmed to 0.791V ±14mV over temperature, enabling accurate 0.8V–24V outputs with standard 1% resistors.

Does MPQ2314GJ-P support forced PWM mode, and how is it enabled?

Yes - driving the AAM pin to VCC (≥4.5V) forces continuous conduction mode (CCM) regardless of load, disabling AAM/PFM operation. This is confirmed in the PIN FUNCTIONS table (page 11): "Drive AAM pin high (=VCC) will force MPQ2314 into CCM." No additional components are required.

What is the purpose of the 20Ω resistor between SW and BST pins?

The 20Ω resistor limits inrush current into the BST capacitor during each high-side switch turn-on, preventing excessive stress on the internal bootstrap driver and reducing ringing on the BST node. It also damps resonance between BST capacitance and PCB trace inductance, improving reliability per MPS layout guidelines.

How does the hiccup-mode OCP behave during sustained short-circuit conditions?

When FB drops below 50% of the reference (≈0.4V), the MPQ2314GJ-P enters hiccup mode: it disables switching for ~10ms, then attempts restart. If short persists, it repeats the cycle, limiting average short-circuit current to <200mA and die temperature to <130°C - preventing thermal runaway and enabling safe recovery after fault removal.