Monolithic Power Systems Inc. MP2303ADN-LF-P

Overview

MP2303ADN-LF-P from Monolithic Power Systems is a synchronous buck DC-DC converter integrating 150mΩ high-side and 80mΩ low-side MOSFETs, delivering 3A continuous output current across 4.7V–28V input range with fixed 360kHz switching frequency and 0.80V feedback reference. It regulates down to 0.80V output voltage, supports ceramic output capacitors, and features cycle-by-cycle over-current protection, UVLO (3.95V), and <1μA shutdown current - used in notebook power rails and distributed supply pre-regulation.

For engineers reviewing the MP2303ADN-LF-P datasheet, MP2303ADN-LF-P pinout, MP2303ADN-LF-P application, or MP2303ADN-LF-P equivalent, key selection criteria include input voltage range compatibility, thermal performance in SOIC8E package, soft-start programmability via SS pin, and feedback loop compensation design using COMP node.

Technical Context

The MP2303ADN-LF-P employs current-mode control with internal transconductance error amplifier (GEA = 550–1100 μA/V) and 360kHz oscillator for fast transient response and stable regulation. Its functional block includes integrated high/low-side N-MOSFETs, bootstrap charge circuit (BS/SW), and over-voltage protection latching at 0.95V FB threshold.

Operation requires external bootstrap capacitor (≥0.01μF) between SW and BS pins to drive the high-side gate above VIN; EN enables digital on/off control with 1.3V rising threshold and 205mV hysteresis; FB senses output via resistive divider referenced to 0.80V ±2.5% over temperature.

Key Specifications

Pinout & Package

MP2303ADN-LF-P is housed in an 8-pin SOIC-EP (SOIC8E) package with exposed thermal pad connected to Pin 4 (GND). The thermally enhanced layout supports up to 2.5W power dissipation at +25°C ambient (θJA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2303ADN-LF-P, MP2338DN-LF-Z offers higher current and frequency in same footprint but requires updated compensation; LM2678SD-3.3/NOPB trades integration for input voltage headroom, increasing board area and reducing peak efficiency by ~4%.

Availability

MP2303ADN-LF-P is available at Aetrix Electronics and suitable for industrial PLC power supplies, notebook subsystem rails, telecom pre-regulators, and automotive display modules requiring stable component supply and long-term sourcing continuity.

Supply support for MP2303ADN-LF-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, WA, with global design and support operations.

The MP2303A belongs to MPS's synchronous buck regulator product line, engineered for compact, efficient DC-DC conversion in space- and thermal-constrained applications such as portable electronics and industrial controls.

FAQ

What is the maximum recommended output voltage for MP2303ADN-LF-P?

The MP2303ADN-LF-P supports output voltages up to 25V, set by the FB resistive divider. This is limited by the absolute maximum voltage rating of the FB pin (6V) and practical stability constraints of the compensation network at high VOUT. Operation above 12V requires careful attention to loop gain and ESR zero placement.

Can MP2303ADN-LF-P operate with a 3.3V input supply?

No - the minimum operating input voltage is 4.7V, enforced by internal UVLO (3.95V typical). At 3.3V input, the device remains in shutdown mode and will not regulate. For sub-4.7V applications, consider MPS's MP210x or MP214x series of low-input buck regulators.

Is an external Schottky diode required for MP2303ADN-LF-P operation?

No - the MP2303ADN-LF-P integrates both high- and low-side MOSFETs for synchronous rectification. An external Schottky diode is optional and only recommended to improve light-load efficiency by bypassing the low-side MOSFET's body diode conduction losses in specific high-duty-cycle scenarios.

How is thermal performance affected by the exposed pad connection?

The exposed thermal pad (connected to Pin 4/GND) must be soldered to a dedicated PCB copper pour tied to ground. Without this, θJA degrades from 50°C/W to >70°C/W, risking thermal shutdown at >1.5A load. Minimum recommended pad area is 120 mm² with ≥4 thermal vias to inner ground planes.

What happens if the SS pin is left floating?

Leaving the SS pin unconnected disables soft-start, causing immediate full-output voltage ramp at enable. This may induce large inrush current, potentially tripping upstream current limits or causing output overshoot. Always tie SS to GND through a capacitor or directly to GND to ensure controlled startup.

Does MP2303ADN-LF-P support adjustable switching frequency?

No - the MP2303ADN-LF-P uses an internal fixed-frequency oscillator set to 360kHz (±14% over temperature). Frequency cannot be adjusted externally. For programmable frequency, consider MPS's MP2451 or MPQ4312, which offer resistor-set or SYNC-input options.

What is the purpose of the BS-to-SW capacitor, and what value is recommended?

The BS-to-SW capacitor (≥0.01μF, X7R ceramic) provides charge storage to drive the high-side MOSFET gate above VIN. It is replenished each time SW pulls low. A 0.1μF capacitor is recommended for robustness across temperature and load; smaller values risk shoot-through or reduced efficiency at high duty cycles.