Monolithic Power Systems Inc. MP2314SGJ-P

Overview

MP2314SGJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 140mΩ high-side and 65mΩ low-side MOSFETs, delivering 2A continuous output current across a 4.5V–24V input range. It operates at a fixed 500kHz switching frequency with AAM power-save mode, internal soft-start, and full protection including OCP, OVP, and thermal shutdown. It targets compact I/O power rails in portable electronics requiring stable 0.8V–VIN adjustable output.

For engineers reviewing the MP2314SGJ-P datasheet, MP2314SGJ-P pinout, MP2314SGJ-P application, or MP2314SGJ-P equivalent, key selection criteria include its TSOT23-8 footprint, 1.5ms internal soft-start timing, 791mV feedback reference voltage, and bootstrap-capacitor-dependent high-side gate drive - all critical for layout-sensitive, space-constrained buck designs.

Technical Context

The MP2314SGJ-P uses peak-current-mode control with a fixed 500kHz oscillator and supports automatic pulse-frequency modulation (PFM) via its AAM pin to maintain high light-load efficiency. Its internal 5.1V LDO powers bias circuitry across the full input range, while cycle-by-cycle over-current protection triggers hiccup mode during sustained overload.

Feedback regulation relies on a precision 791mV reference and error amplifier with optimized internal compensation; output voltage is set externally via resistor divider on FB. The bootstrap circuit (BST–SW) enables high-side N-channel MOSFET drive, requiring external 0.1–1μF capacitor and optional external diode for >65% duty cycles.

Key Specifications

Pinout & Package

MP2314SGJ-P is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density PCB layouts with exposed thermal pad connection to GND plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2314SGJ-P, MP2315DJ-LF-Z offers higher current headroom at the cost of footprint and thermal derating, while RT7297BZSP trades integration for flexibility - making MP2314SGJ-P optimal for space-constrained, efficiency-critical 2A applications where internal FETs and AAM are decisive.

Availability

MP2314SGJ-P is available at Aetrix Electronics and suitable for notebook I/O power, flat-panel display bias, digital set-top box SoC supplies, and industrial HMI subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2314SGJ-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 focus on energy-efficient DC/DC conversion, motor drivers, and LED lighting solutions.

The MP2314S product line delivers compact, high-efficiency synchronous buck converters for space- and thermal-constrained applications in consumer, computing, and industrial markets - designed to replace linear regulators and discrete switchers with minimal external components.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2314SGJ-P is optimized for 44μF ceramic output capacitance, as validated in the typical application circuit. Using ≥33μF X5R/X7R ceramic capacitors with ≤10mΩ ESR ensures stable regulation and meets ripple requirements across 0–2A load steps. Lower values may cause instability or excessive output voltage deviation under transient load.

Can the MP2314SGJ-P operate with an input voltage below 4.5V?

No - the absolute minimum operating input voltage is 4.5V, enforced by internal UVLO with 4.05V rising threshold and 750mV hysteresis. Below this, the IC remains disabled. Attempting operation at 4.2V or lower will prevent startup and may cause erratic behavior due to insufficient VCC regulation.

How does the AAM pin affect light-load efficiency?

The AAM pin sets the COMP voltage threshold that triggers PFM mode: when V_COMP falls below V_AAM, the internal clock is gated and pulse skipping begins. Setting V_AAM ≈ 0.4×V_REF (e.g., 316mV) maximizes light-load efficiency while maintaining acceptable output ripple and transient response per Figure 6 in the datasheet.

Is an external bootstrap diode required?

An external bootstrap diode (e.g., 1N4148) is recommended only when duty cycle exceeds 65% - i.e., when V_OUT/V_IN > 0.65, such as 5V output from 6.5V input. It improves BST capacitor recharge efficiency and reduces power loss in the internal charge path, especially in high-duty-cycle, high-temperature environments.

What is the maximum allowable RMS current in the input capacitor?

The worst-case RMS input capacitor current is half the maximum load current (I_LOAD/2 = 1A for 2A output), occurring at V_IN = 2×V_OUT. Therefore, the input capacitor must be rated for ≥1A RMS ripple current. A 22μF X5R ceramic capacitor with ≥1.5A RMS rating meets this requirement while minimizing voltage ripple.

Does the MP2314SGJ-P support forced PWM mode?

No - the MP2314SGJ-P does not offer a dedicated forced-PWM pin or register. It operates exclusively in automatic PWM/AAM hybrid mode. To enforce continuous conduction mode (CCM), tie the AAM pin to VCC or leave it floating; this disables AAM and forces fixed-frequency PWM across all load conditions.

What is the thermal resistance θ_JA for the TSOT23-8 package?

The specified junction-to-ambient thermal resistance (θ_JA) for MP2314SGJ-P in TSOT23-8 is 100°C/W, measured on a 4-layer JEDEC JESD51-7 PCB. Achieving this value requires proper thermal pad soldering to a ≥1cm² GND copper pour with ≥4 thermal vias - inadequate layout can raise θ_JA to >150°C/W and trigger thermal shutdown at <1.5A.