Monolithic Power Systems Inc. MP2305DS-LF-P

Overview

MP2305DS-LF-P from Monolithic Power Systems is a monolithic synchronous buck regulator integrating 130mΩ high- and low-side N-channel MOSFETs, delivering 2A continuous output current across a 4.75V–23V input range with fixed 340kHz switching frequency and 0.923V feedback reference voltage. It regulates down to 0.923V output, supports adjustable soft-start via external capacitor, and features cycle-by-cycle overcurrent protection - deployed in FPGA/DSP power supplies and notebook DC-DC conversion.

For engineers reviewing the MP2305DS-LF-P datasheet, MP2305DS-LF-P pinout, MP2305DS-LF-P application, or MP2305DS-LF-P equivalent, key selection criteria include its SOIC8 package thermal resistance (θJA = 90°C/W), shutdown supply current (1μA), input UVLO threshold (4.10V typ), and compatibility with low-ESR ceramic output capacitors without external diode requirements in most configurations.

Technical Context

The MP2305DS-LF-P implements current-mode control with internal transconductance error amplifier (GEA = 800μA/V) and COMP-pin-based loop compensation, enabling fast transient response and stable regulation across wide VIN and VOUT ranges. Its functional block includes integrated high-side and low-side switches driven by a bootstrap circuit (BS–SW capacitor ≥0.01μF) and protected by thermal shutdown at 160°C.

It operates with fixed 340kHz oscillator frequency and supports duty cycle up to 90%, requiring external R–C network on COMP for stability. The FB pin senses output via resistive divider referenced to 0.923V, while EN enables digital on/off control with 1.5V typical turn-on threshold and 210mV hysteresis.

Key Specifications

Pinout & Package

MP2305DS-LF-P is housed in an 8-pin SOIC package (JEDEC MS-012 AA, 3.9mm × 4.9mm body, 1.27mm pitch) with exposed pad not electrically connected. Thermal resistance θJA = 90°C/W and θJC = 45°C/W measured per JESD51-7 on 4-layer PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2305DS-LF-P, MP2314S offers higher efficiency and broader temperature operation for future-proof designs, while MP2307DN trades package compatibility for thermal and size advantages - neither matches the original's SOIC8 footprint and legacy design reuse value.

Availability

MP2305DS-LF-P is available at Aetrix Electronics and suitable for networking systems, FPGA power supplies, notebook DC-DC conversion, and green appliance auxiliary rails requiring stable component supply and long-term obsolescence management.

Supply support for MP2305DS-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, with design centers in the US, China, and Taiwan, and global distribution since 1997.

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

FAQ

What is the recommended input capacitor for MP2305DS-LF-P?

A low-ESR ceramic capacitor (X5R/X7R) ≥10μF placed close to the IN and GND pins is recommended. For 12V input, a 10μF/25V MLCC suffices; RMS current rating should exceed half the maximum load current (≥1A). Add a 0.1μF ceramic in parallel for high-frequency noise suppression.

Can MP2305DS-LF-P operate without an external bootstrap capacitor?

No - a minimum 0.01μF ceramic capacitor between BS and SW is mandatory to charge the high-side gate driver. Omitting it prevents high-side MOSFET turn-on, causing regulator failure or excessive heating at the low-side switch.

Is MP2305DS-LF-P RoHS-compliant and lead-free?

Yes - the "-LF" suffix denotes lead-free, RoHS-compliant packaging. All MPS devices meet EU RoHS Directive 2011/65/EU and are halogen-free per IEC 61249-2-21 standards.

What is the minimum output voltage achievable with MP2305DS-LF-P?

The minimum regulated output is 0.923V, set by the internal feedback reference voltage. Output voltages below this cannot be achieved - the FB pin requires exactly 0.923V for regulation, so VOUT = 0.923V × (1 + R1/R2) ≥ 0.923V.

Does MP2305DS-LF-P require an external Schottky diode?

No - the integrated synchronous rectification eliminates body-diode conduction loss. An external Schottky is optional only in high-duty-cycle scenarios (e.g., 5V out from 5.5V in) to marginally improve efficiency; not required for typical 12V→3.3V or 19V→5V use.

How does the EN pin behave during power-up?

EN has 1.5V typical rising threshold and 210mV hysteresis. When pulled high via 100kΩ resistor to VIN, it enables the regulator after internal soft-start begins. If left floating, EN defaults to low due to internal leakage, keeping the device in shutdown.

What is the maximum allowable output capacitance?

No hard upper limit exists, but large output capacitance (>100μF) may destabilize the control loop without compensating C3/C6 values. For ceramic outputs, 22μF is typical; for tantalum/electrolytic, ≤47μF with ESR ≥5mΩ is recommended to maintain phase margin.