Monolithic Power Systems Inc. MP2303ADN-LF

Overview

MP2303ADN-LF 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 and supports adjustable soft-start for inrush control in industrial power rails.

For engineers reviewing the MP2303ADN-LF datasheet, MP2303ADN-LF pinout, MP2303ADN-LF application, or MP2303ADN-LF equivalent, key selection criteria include its integrated FETs, current-mode control architecture, thermal shutdown at 160°C, UVLO threshold of 3.95V, and compatibility with low-ESR ceramic output capacitors in compact SOIC8E packaging.

Technical Context

The MP2303ADN-LF employs peak-current-mode control with internal transconductance error amplifier (GEA = 550–1100 μA/V) and 360kHz oscillator (±10% over temperature), enabling fast transient response and stable regulation across wide VIN and VOUT ranges. Its block diagram integrates a 5V internal regulator for gate drive, OVP latch at 0.95V on FB, and cycle-by-cycle current limiting using sensed switch current.

Operation requires external bootstrap capacitor between SW and BS pins to enable high-side N-MOSFET drive; EN pin provides digital on/off control with 1.3V rising threshold and 205mV hysteresis, while SS pin sets soft-start duration via external capacitor (e.g., 0.1μF → 15ms). Shutdown supply current is <3.0μA.

Key Specifications

Pinout & Package

MP2303ADN-LF uses thermally enhanced SOIC8E (8-pin, exposed pad) package per JEDEC MS-012 BA, with 50°C/W θ_JA on 4-layer PCB. Exposed pad must be connected to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2303ADN-LF, MP2338DN-LF offers higher current and frequency but demands revised compensation and layout; LM2678SD-3.3/NOPB lacks synchronous rectification, increasing conduction loss and thermal stress-making MP2303ADN-LF optimal for compact, efficient 3A POL conversion.

Availability

MP2303ADN-LF is available at Aetrix Electronics and suitable for industrial motor drives, medical diagnostic equipment, ruggedized IoT gateways, and point-of-load conversion requiring stable component supply and RoHS-compliant packaging.

Supply support for MP2303ADN-LF 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 design centers in the US, China, and Taiwan.

The MP2300 series targets cost-sensitive, space-constrained DC-DC conversion in industrial, computing, and consumer applications-emphasizing integration, thermal robustness, and ease of use with minimal external components.

FAQ

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

The MP2303ADN-LF supports output voltages up to 25V, set by the feedback divider ratio (V_OUT = 0.80 × (1 + R1/R2)). This limit is enforced by internal OVP circuitry tripping at 0.95V on FB, corresponding to ~23.75V at the output. Operation above 25V risks OVP latch and requires external clamping.

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

No. The MP2303ADN-LF has a minimum input voltage of 4.7V per datasheet specifications and UVLO activation at 3.95V. At 3.3V, the device remains in undervoltage lockout and will not start or regulate. For sub-5V inputs, consider MPS's MP2101 or MP2143 families.

Is an external Schottky diode required for proper operation?

No. The MP2303ADN-LF uses synchronous rectification with integrated low-side MOSFET, eliminating the need for an external diode. However, adding a Schottky (e.g., B340) from SW to GND may improve efficiency by ~1–2% under light loads by bypassing the body diode conduction loss during dead-time.

How does the bootstrap capacitor value affect performance?

A minimum 0.01μF ceramic capacitor between SW and BS is required to sustain high-side gate drive. Values <0.01μF risk insufficient charge transfer, causing high-side FET dropout and regulation failure. Larger values (e.g., 0.1μF) improve reliability under high-duty-cycle conditions (e.g., 5V→3.3V) but add no benefit beyond 0.1μF.

What is the purpose of the exposed pad on the SOIC8E package?

The exposed pad on MP2303ADN-LF's SOIC8E package serves dual functions: it provides primary thermal dissipation path (reducing θ_JA by ~20°C/W) and acts as the main GND connection for power and signal return. It must be soldered to a dedicated PCB GND plane with ≥4 thermal vias for rated 3A operation and thermal shutdown avoidance.

Does MP2303ADN-LF support forced PWM mode?

No. MP2303ADN-LF operates exclusively in continuous conduction mode (CCM) with peak-current-mode control and no pulse-skipping or PFM capability. Light-load efficiency is maintained via low quiescent current (1.6mA active, <3μA shutdown), but it does not enter discontinuous conduction mode (DCM) or burst mode automatically.

What is the recommended minimum output capacitance?

For stable operation with ceramic output capacitors, a minimum of 22μF is recommended (e.g., two 10μF X7R 0805s in parallel). Lower values risk instability or excessive output ripple; the device is optimized for 22–100μF ceramic banks with ESR <10mΩ. Aluminum electrolytic alternatives require ≥470μF and careful ESR zero compensation.