Monolithic Power Systems Inc. MP2364DF-LF-P

Overview

MP2364DF-LF-P from Monolithic Power Systems is a dual-channel synchronous step-down DC/DC converter IC with integrated 0.18Ω high-side and 10Ω low-side MOSFETs per channel, delivering 1.5A continuous output current per channel across 4.75V–23V input range, operating at fixed 1.4MHz switching frequency, and supporting adjustable output voltages from 0.92V to 16V - used in DSL modems and set-top boxes for dual-rail I/O and core supply generation.

For engineers reviewing the MP2364DF-LF-P datasheet, MP2364DF-LF-P pinout, MP2364DF-LF-P application, or MP2364DF-LF-P equivalent, key selection criteria include dual-channel current-mode control, thermal shutdown, cycle-by-cycle overcurrent protection, programmable soft-start, and TSSOP20F package with exposed pad for thermal management.

Technical Context

The MP2364DF-LF-P implements independent current-mode control per channel using transconductance error amplifiers (GEA = 630–1230 µA/V) and slope-compensated peak-current sensing, with COMP pins serving as error amplifier outputs for external RC compensation networks. Each channel features dedicated enable/UVLO (VEN rising threshold = 2.50V), soft-start (9kΩ internal pull-up), and feedback (0.92V reference) circuitry.

It integrates two complete buck regulators sharing no internal signal paths - each with separate INA/INB, SWA/SWB, PGA/PGB, SGA/SGB, FBA/FBB, COMPA/COMPB, ENA/ENB, SSA/SSB, BSA/BSB pins - enabling independent voltage programming, sequencing, and fault handling. The 1.4MHz oscillator ensures compact magnetics while maintaining >70% efficiency at 1.5A load across 3.3V and 5V outputs.

Key Specifications

Pinout & Package

MP2364DF-LF-P is housed in a thermally enhanced TSSOP20F package with exposed pad (θ_JA = 40°C/W, θ_JC = 6°C/W), requiring soldering of the exposed pad to a large PCB copper area for reliable 1.5A/channel operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel buck converter applications.

Compared with RTQ2132B-QT and TPS54290PWPR, MP2364DF-LF-P offers optimal balance of size (TSSOP20F), thermal performance (exposed pad), and simplicity (no external boot diodes) for cost-sensitive consumer broadband equipment operating up to +85°C.

Availability

MP2364DF-LF-P is available at Aetrix Electronics and suitable for DSL modems, set-top boxes, cable modems, and distributed telecom power systems requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for MP2364DF-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 expertise in DC/DC conversion, LED drivers, and motor control solutions since 1997.

The MP2364 belongs to MPS's high-density monolithic buck converter product line, designed specifically for space-constrained broadband and consumer electronics where dual-rail efficiency, thermal manageability, and minimal external components are critical.

FAQ

What is the maximum recommended output current per channel for continuous operation?

The MP2364DF-LF-P delivers 1.5A continuous output current per channel under typical conditions (T_A ≤ +85°C, proper PCB thermal design with exposed pad soldered). Derating is required above +85°C ambient or with insufficient copper area; full 1.5A is validated at 12V_IN/3.3V_OUT with 5µH inductor and 22µF ceramic output cap.

Can the two channels be paralleled for higher current output?

Yes - the MP2364DF-LF-P supports single-output mode by connecting INA/INB, SWA/SWB, PGA/PGB, SGA/SGB, FBA/FBB, COMPA/COMPB, ENA/ENB, and SSA/SSB together, achieving up to 3.0A total output with synchronized switching and shared feedback. External current-sharing resistors are not required due to matched internal MOSFETs and error amplifiers.

Is an external bootstrap diode required for standard operation?

No - the MP2364DF-LF-P operates reliably without external bootstrap diodes for V_OUT ≥ 5V and duty cycles <65%. An IN4148 diode from V_OUT to BSA/BSB is only recommended when V_OUT = 3.3V and D >65% (e.g., 12V_IN → 3.3V_OUT) to maintain high-side gate drive strength and efficiency.

What is the minimum output voltage achievable with the internal 0.92V reference?

The minimum regulated output voltage is 0.92V, set by the internal bandgap reference. This is achieved by connecting FBA/FBB directly to the output (R2 = 0Ω, R1 open), as confirmed in the datasheet's "Setting the Output Voltage" section and typical application circuits.

How does the cycle-by-cycle current limit interact with duty cycle and slope compensation?

The current limit threshold increases above 40% duty cycle due to slope compensation - e.g., at 50% duty cycle, effective current limit rises from 2.5A to ~2.8A. This prevents subharmonic oscillation and maintains stability across full load and input ranges, as detailed in Electrical Characteristics Note 4 and Operation section.

What thermal resistance values apply to the TSSOP20F package?

The MP2364DF-LF-P in TSSOP20F has θ_JA = 40°C/W and θ_JC = 6°C/W when mounted on a 1" square, 1 oz copper PCB per JEDEC standards. Actual θ_JA improves significantly with larger thermal pads and internal copper planes - measured data shows ≤28°C/W with 4-layer board and 300mm² exposed pad copper.

Does the device support forced PWM or power-save mode automatically?

The MP2364DF-LF-P operates exclusively in forced continuous conduction mode (CCM) - no automatic pulse-skipping or power-save mode. This ensures constant 1.4MHz switching for predictable EMI and stable light-load regulation, critical for noise-sensitive video and RF subsystems in set-top boxes.