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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP2359DJ-LF-P

Name: MP2359DJ-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP2359DJ-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2359DJ-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-6 Thin, TSOT-23-6

Datasheet:: MP2359DJ-LF-P.pdf

Description:: IC REG BUCK ADJ 1.2A TSOT23-6

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Product details

Overview

MP2359DJ-LF-P from Monolithic Power Systems is a current-mode synchronous step-down DC/DC converter with integrated 0.35Ω high-side MOSFET, delivering up to 1.2A output current across 4.5V–24V input range, fixed 1.4MHz switching frequency, and adjustable output from 0.81V to 15V. It operates in TSOT23-6 package and supports battery-powered industrial sensors requiring compact, efficient local regulation.

For engineers reviewing the MP2359DJ-LF-P datasheet, MP2359DJ-LF-P pinout, MP2359DJ-LF-P application, or MP2359DJ-LF-P equivalent, key selection criteria include thermal shutdown threshold (150°C), cycle-by-cycle overcurrent protection (1.8A limit), feedback voltage accuracy (±2.5% at 0.81V), and bootstrap capacitor integration for high-duty-cycle operation.

Technical Context

The MP2359DJ-LF-P implements peak-current-mode control with internal slope compensation, enabling stable loop response without external compensation components. Its error amplifier compares FB voltage against a trimmed 0.81V bandgap reference and drives PWM comparator via integrated ramp generator synchronized to 1.4MHz oscillator.

Bootstrap circuitry (BST pin) supplies gate drive above VIN for the internal N-channel MOSFET switch, supporting duty cycles up to 87%. Fault handling includes cycle-by-cycle current limiting triggered when sensed inductor current exceeds 1.8A, plus thermal shutdown activation at 150°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 24V - supports wide-range industrial power rails and 12V/24V battery systems without pre-regulation.
Output Voltage Range	0.81V to 15V - adjustable via external resistor divider; enables direct generation of 3.3V, 5V, or 12V logic/system rails.
Switching Frequency	Fixed 1.4MHz - allows use of small external inductors (e.g., 4.7µH) and ceramic capacitors while avoiding AM radio band interference.
Peak Output Current	1.2A - sufficient for powering microcontrollers, RF modules, and sensor signal chains in space-constrained designs.
Feedback Voltage	0.810V ±2.5% - high-accuracy reference enables tight output regulation (<±1% typical under load transients).
Shutdown Quiescent Current	0.1μA - enables ultra-low-power system sleep modes without compromising fast wake-up capability.
Internal MOSFET R_DS(ON)	0.35Ω - reduces conduction loss and improves efficiency up to 92% at 1A load with 12V input.

Pinout & Package

MP2359DJ-LF-P is housed in a thermally enhanced TSOT23-6 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density PCB layouts and capable of 0.568W continuous power dissipation at +25°C ambient.

Pin/Terminal	Circuit Role	Design Meaning
1 BST	Bootstrap supply node	Connects external 0.1µF ceramic capacitor between BST and SW to generate floating gate-drive voltage for high-side MOSFET.
2 GND	Power and signal ground reference	Primary return path for switching current and feedback reference; must be routed outside high-di/dt paths to avoid noise coupling into FB.
3 FB	Output voltage feedback input	Senses divided output voltage; internal 0.81V reference sets regulation point; foldback activates below 250mV during short-circuit.
4 EN	Enable control input	Active-high logic input; device enabled when voltage ≥1.2V; internal 0.1μA pull-down ensures default-off state.
5 IN	Main power input	Accepts 4.5V–24V unregulated supply; requires local 4.7µF X5R/X7R ceramic decoupling capacitor near pin.
6 SW	Switch node output	Drives external Schottky diode (e.g., B230A) and inductor; carries high di/dt switching current; layout critical for EMI control.

Key Features

Feature	Design Value
Stable with low-ESR ceramic output capacitors	Eliminates need for electrolytic or tantalum capacitors; enables compact, long-life, low-impedance output filtering using standard 22µF X5R ceramics.
Thermal shutdown with automatic recovery	Halts switching at 150°C junction temperature and resumes operation once die cools below hysteresis threshold - prevents permanent damage without external intervention.
Cycle-by-cycle overcurrent protection	Detects peak inductor current exceeding 1.8A each switching cycle, limiting fault energy and enabling robust short-circuit survival.
High-efficiency operation up to 92%	Achieved via low-R_DS(ON) MOSFET and optimized gate drive; reduces thermal load in sealed enclosures and extends battery runtime.
Wide input range with UVLO hysteresis	Turns on at 2.8V (rising) and off at 2.65V (falling); prevents erratic startup/shutdown near brown-out thresholds in automotive or battery-fed systems.

Applications

Industrial Sensor Node Power

USB-C Powered Peripherals

Use Scenario: Compact wireless temperature/humidity sensor powered by single Li-ion cell (3.0–4.2V) or 12V field bus.

IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3V for MCU, radio, and analog front-end.

Use Value: Delivers 1.2A peak current with <100mV output ripple using only 4.7µH inductor and 22µF ceramic output cap - minimizing board area and BOM count.

Use Scenario: USB-C PD sink device requiring 5V rail from variable 5–20V input negotiated via PD controller.

IC Role / Device Role / Timing Role: Secondary buck stage regulating negotiated PD voltage down to fixed 5V for USB downstream ports or Type-A emulation.

Use Value: Fixed 1.4MHz operation avoids interference with USB 2.0 data lines; 0.1μA shutdown current preserves host battery during suspend.

LED Backlight Driver

Pre-regulator for LDOs

Use Scenario: White LED string driver in portable medical display or handheld test equipment with 6–12V input.

IC Role / Device Role / Timing Role: Constant-voltage source driving series LEDs via external current-sense resistor; configured as adjustable 5V/3.3V rail.

Use Value: Supports high-duty-cycle operation (up to 87%) with optional external bootstrap diode (IN4148), improving efficiency >5% at V_OUT=5V/12V_IN.

Use Scenario: Intermediate supply stage feeding low-noise LDOs in audio codec or precision ADC subsystems.

IC Role / Device Role / Timing Role: Efficient pre-regulator reducing dropout voltage stress on downstream linear regulators.

Use Value: 92% peak efficiency at 1A reduces heat generation before sensitive analog stages; low 0.81V FB reference enables precise LDO input margining.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2331H	Higher 2A output current, 2.2MHz switching frequency, improved light-load efficiency (PFM mode), smaller 1.5A current limit threshold.	Preferred for new designs needing higher current headroom or tighter size constraints; not pin-compatible due to different pinout and BST configuration.	Select MP2331H for next-generation designs where 1.2A rating is insufficient or where 2.2MHz enables sub-2.2µH inductors.
RT7297C	1.5A output, 1.5MHz switching, 0.8V reference, integrated soft-start, no BST pin - uses internal charge pump instead.	Better suited for cost-sensitive consumer applications; lacks bootstrap flexibility for high-duty-cycle operation above 65%.	Choose RT7297C when simplified layout (no BST cap/diode) and soft-start are prioritized over maximum efficiency at high V_OUT/V_IN ratios.

Compared with MP2359DJ-LF-P, MP2331H offers higher current and frequency but requires PCB redesign, while RT7297C simplifies layout at the expense of adjustable high-duty-cycle performance and thermal margin.

Availability

MP2359DJ-LF-P is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-C peripheral power management, LED backlight drivers, and LDO pre-regulation requiring stable component supply across extended temperature ranges.

Supply support for MP2359DJ-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 mixed-signal ICs for power management, motion control, and interface applications.

The MP2359 belongs to MPS's high-efficiency DC/DC converter product line, designed specifically for space-constrained industrial, computing, and consumer applications demanding wide-input, low-quiescent-current, and thermally robust step-down regulation.

FAQ

What is the recommended minimum output capacitor value for stable operation?

A minimum 22µF X5R or X7R ceramic capacitor is required at the output to ensure loop stability and limit ripple voltage to <50mV peak-to-peak under full 1.2A load. Lower values risk instability or excessive output voltage deviation during transient events, especially when using inductors below 4.7µH.

Can MP2359DJ-LF-P operate with an input voltage below 4.5V?

No - the absolute minimum operating input voltage is 4.5V per the Recommended Operating Conditions table. Input voltages below this threshold trigger undervoltage lockout (UVLO), disabling switching. The UVLO rising threshold is 2.8V, but functional regulation requires ≥4.5V to sustain gate drive and internal bias circuits.

Is an external bootstrap diode required for all applications?

An external bootstrap diode (e.g., IN4148) is optional and recommended only when V_OUT = 3.3V or 5V and duty cycle exceeds 65% (i.e., V_OUT/V_IN > 0.65). It improves gate drive strength and efficiency under high-duty conditions but adds no benefit for lower-ratio conversions or light loads.

What is the maximum allowable PCB copper area connected to the GND pin?

No maximum area is specified - in fact, connecting the GND pin to the largest feasible solid copper pour significantly improves thermal performance and noise immunity. The datasheet explicitly recommends routing GND to a large copper area to enhance long-term reliability and reduce junction temperature rise under 1.2A load.

Does MP2359DJ-LF-P support forced PWM mode or only auto PFM/PWM?

MP2359DJ-LF-P operates exclusively in forced PWM mode - it does not feature pulse-frequency modulation (PFM) or discontinuous conduction mode (DCM) at light loads. This ensures constant 1.4MHz switching frequency regardless of load, simplifying EMI filtering and avoiding audible noise in sensitive applications.

How is the current limit threshold affected by temperature?

The 1.8A current limit is guaranteed by design and remains stable across –40°C to +85°C ambient. The datasheet notes "Guaranteed by design" for this parameter, and typical performance curves show minimal drift - less than ±5% variation over full temperature range - due to matched internal current-sense architecture.

What failure modes are protected against, and how do protections reset?

MP2359DJ-LF-P provides cycle-by-cycle overcurrent protection (immediate current cutoff per cycle) and thermal shutdown (latches off until junction cools ~15°C below trip point). Both recover automatically: current limiting resets every cycle; thermal shutdown resumes operation after die temperature falls below hysteresis threshold (~135°C).

MP2359DJ-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: SOT-23-6 Thin, TSOT-23-6

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 4.5V

Voltage - Input (Max):: 24V

Voltage - Output (Min/Fixed):: 0.81V

Voltage - Output (Max):: 15V

Current - Output:: 1.2A

Frequency - Switching:: 1.4MHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-6

MP2359DJ-LF-P FAQ

1.How can I place an order for MP2359DJ-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2359DJ-LF-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MP2359DJ-LF-P reliable?

The price and inventory of MP2359DJ-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2359DJ-LF-P is usually 5 days.

3.What payment methods are accepted for MP2359DJ-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2359DJ-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2359DJ-LF-P?

MP2359DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2359DJ-LF-P order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MP2359DJ-LF-P?

For technical support, including MP2359DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2359DJ-LF-P requirements.

6.How does Aetrix verify that MP2359DJ-LF-P is sourced from the original manufacturer or authorized distributors?

All MP2359DJ-LF-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP2359DJ-LF-P meets industry standards.

7.What is the process for return or replacement of MP2359DJ-LF-P?

All MP2359DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2359DJ-LF-P, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MP2359DJ-LF-P part is unused and in its original packaging.

Return procedure for MP2359DJ-LF-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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