Monolithic Power Systems Inc. MP2314SGJ-Z

Overview

MP2314SGJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 140mΩ high-side and 65mΩ low-side MOSFETs, delivering 2A continuous output current across a 4.5V–24V input range and adjustable output down to 0.8V. 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 space-constrained consumer and embedded systems.

For engineers reviewing the MP2314SGJ-Z datasheet, MP2314SGJ-Z pinout, MP2314SGJ-Z application, or MP2314SGJ-Z equivalent, key selection considerations include its TSOT23-8 footprint, 1.5ms internal soft-start timing, 791mV feedback reference voltage, and bootstrap capacitor requirements for high-duty-cycle operation - all critical for stable 5V/3.3V/1.8V point-of-load designs.

Technical Context

The MP2314SGJ-Z uses peak-current-mode control with an internal 5.1V LDO (VCC) powering error amplifier, PWM comparator, and gate drivers. Its current-sense architecture enables fast transient response and supports hiccup-mode over-current protection triggered when FB falls below 50% of VREF.

Advanced Asynchronous Modulation (AAM) dynamically disables the internal clock under light load by comparing COMP voltage against an externally set AAM threshold, enabling PFM operation while maintaining regulation via feedback-controlled pulse skipping - distinct from fixed-frequency PWM-only controllers.

Key Specifications

Pinout & Package

MP2314SGJ-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density on compact PCBs. The exposed pad (Pin 4 GND) must be soldered to a thermal pad for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2314SGJ-Z, MP2315DJ-LF-Z trades AAM efficiency for higher current and better thermal performance, while RT6220HGQW sacrifices integration and protection for layout and control flexibility - making MP2314SGJ-Z optimal for cost-sensitive, space-constrained 2A PoL applications needing full protection and light-load optimization.

Availability

MP2314SGJ-Z is available at Aetrix Electronics and suitable for notebook I/O power, industrial PLC modules, smart home hub core rails, and automotive display supplies requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for MP2314SGJ-Z 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 a 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, industrial, and automotive electronics - emphasizing integration, protection, and ease of use.

FAQ

What is the minimum output voltage achievable with MP2314SGJ-Z?

The MP2314SGJ-Z supports output voltages down to 0.8V, set by the internal 791mV feedback reference and an external resistor divider. This enables direct generation of common low-voltage rails like 1.2V, 1.8V, and 3.3V without post-regulation, provided the divider tolerances and layout parasitics are controlled within ±1% total error budget.

Does MP2314SGJ-Z require an external bootstrap diode?

An external bootstrap diode (e.g., 1N4148) is recommended only when duty cycle exceeds 65% - typically when V_IN > 1.5×V_OUT (e.g., 12V→3.3V). It improves BST capacitor charging efficiency and reduces power loss in the internal charge pump, especially critical in high-duty-cycle 5V/3.3V applications.

How does the AAM mode affect light-load efficiency?

In AAM mode, the MP2314SGJ-Z skips switching cycles under light load (<100mA), reducing switching losses and lowering quiescent current to ~1μA. This raises efficiency from ~65% (PWM-only) to >85% at 10mA load, without compromising regulation accuracy or requiring external control signals.

What is the purpose of the 6.7μA current source at the AAM pin?

The internal 6.7μA current source at the AAM pin establishes a precise bias point for the external resistor divider, enabling accurate calculation of the AAM threshold voltage using Equation (4) from the datasheet. It ensures consistent light-load transition behavior across temperature and process variation without trimming.

Can MP2314SGJ-Z operate with a pre-biased output?

Yes - MP2314SGJ-Z supports monotonic start-up into pre-biased outputs. During startup, it refreshes the BST capacitor and synchronizes the soft-start ramp with the existing V_OUT level at FB, preventing reverse current flow or output collapse that could disrupt downstream logic or memory initialization sequences.

What is the maximum allowable input voltage for sustained operation?

The absolute maximum input voltage is +26V, but the recommended operating range is 4.5V to 24V. Sustained operation above 24V risks exceeding the 28V transient rating on the SW pin and may trigger thermal shutdown due to increased power dissipation in the internal MOSFETs, especially at high ambient temperatures.

How is over-voltage protection implemented on the FB pin?

OVP monitors FB voltage continuously: if it exceeds 120% of V_REF (≈950mV), the IC forces the low-side MOSFET fully on to sink up to –800mA, actively discharging the output capacitor. Protection exits only when FB falls below 109% of V_REF (≈862mV), ensuring robust recovery from transient overvoltage events.