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

Monolithic Power Systems Inc. MP2357DJ-LF-P

Name: MP2357DJ-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP2357DJ-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2357DJ-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: MP2357DJ-LF-P.pdf

Description:: IC REG BUCK ADJ 500MA TSOT23-6

Quantity:: RFQ Add To RFQ list

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Inventory:1,660

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Product details

Overview

MP2357DJ-LF-P from Monolithic Power Systems is a monolithic 0.5A, 24V-input synchronous step-down DC/DC converter with fixed 1.4MHz switching frequency, internal 0.35Ω MOSFET, and adjustable output (0.81V–15V) in TSOT23-6 package. It delivers stable regulation for battery-powered industrial sensors and distributed power rails requiring compact, low-noise buck conversion.

For engineers reviewing the MP2357DJ-LF-P datasheet, MP2357DJ-LF-P pinout, MP2357DJ-LF-P application, or MP2357DJ-LF-P equivalent, key selection criteria include its 4.5–24V input range, cycle-by-cycle current limiting, thermal shutdown, 0.1μA shutdown quiescent current, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MP2357DJ-LF-P implements peak current-mode control with integrated error amplifier, slope compensation, and 1.4MHz oscillator - enabling fast transient response and simplified loop stabilization without external compensation. Its bootstrap gate drive supports high-side N-MOSFET operation with external BST capacitor between SW and BST pins.

It features fixed-frequency PWM operation with foldback protection (460kHz at FB < 250mV), under-voltage lockout (2.8V threshold, 150mV hysteresis), and EN-controlled on/off sequencing. The device operates across –40°C to +85°C and integrates cycle-by-cycle current limiting and thermal shutdown for robust fault handling.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 24V - supports wide-range industrial and automotive supply rails without pre-regulation
Output Voltage Range	0.81V to 15V - set via external resistor divider; enables direct powering of core logic, analog rails, and peripherals
Switching Frequency	Fixed 1.4MHz - allows use of small external inductors (e.g., 4.7µH) and reduces EMI filtering burden
Peak Output Current	0.5A - sufficient for low-power microcontrollers, sensors, and interface ICs in space-constrained designs
R_DS(ON)	0.35Ω - minimizes conduction loss and improves efficiency up to 92% at mid-load conditions
Shutdown Current	0.1μA - enables ultra-low-power sleep modes in battery-backed systems
Feedback Voltage	0.810V (typ) - precise reference enables accurate output regulation with ±2.5% tolerance over line/load/temperature

Pinout & Package

MP2357DJ-LF-P is housed in a thermally enhanced TSOT23-6 package (0.95mm pitch, 2.9mm × 1.6mm footprint) with exposed pad for improved heat dissipation. Pin 1 is bottom-left when viewing top marking left-to-right.

Pin/Terminal	Circuit Role	Design Meaning
BST	Bootstrap supply	Connects external 0.1–1µF capacitor between BST and SW to generate gate drive voltage > VIN for internal high-side MOSFET
GND	Power and signal ground	Reference node for feedback and internal circuitry; must be routed outside high-current paths to avoid noise coupling into FB
FB	Output voltage sense	Inputs divided output voltage; internal 0.81V reference sets regulation point; triggers frequency foldback during short-circuit
EN	Enable control	Active-high logic input; ≥1.2V enables regulator; ≤0.4V disables with 0.1μA shutdown current
IN	Main power input	Accepts 4.5–24V unregulated supply; requires local 4.7µF ceramic decoupling to suppress switching transients
SW	Switch node	Drives external Schottky diode (or synchronous rectifier in alternate designs); high dv/dt node requiring tight layout

Key Features

Feature	Design Value
Internal Power MOSFET	0.35Ω R_DS(ON) high-side switch eliminates external FET and driver, reducing BOM count and PCB area
Ceramic-Capacitor Stable	Compensated for low-ESR ceramic output capacitors (e.g., 22µF X5R), eliminating need for electrolytic or tantalum types
Current-Mode Control	Enables inherent cycle-by-cycle current limiting and simplifies compensation design with single-pole response
Thermal Shutdown	Triggers at 150°C junction temperature and auto-recovers after cooldown, preventing permanent damage during overload
UVLO with Hysteresis	2.8V turn-on threshold with 150mV hysteresis prevents oscillation near brown-out conditions

Applications

Industrial Sensor Node Power

USB-Powered Peripheral Regulator

Use Scenario: Compact wireless sensor node powered by 9–24V industrial bus or Li-ion pack with strict size and thermal constraints.

IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3V @ 400mA to MCU, RF transceiver, and analog front-end.

Use Value: TSOT23-6 footprint and 1.4MHz switching enable <10mm² solution size; 0.1μA shutdown extends battery life in sleep mode.

Use Scenario: USB 5V-powered test fixture or docking station requiring clean 1.8V rail for FPGA I/O banks.

IC Role / Device Role / Timing Role: Pre-regulator stepping 5V down to 1.8V before LDO post-regulation.

Use Value: Fixed 1.4MHz frequency avoids audible noise; 0.81V FB reference ensures accurate low-voltage setting with standard resistor ratios.

Automotive Body Control Module

Distributed Telecom Power Rail

Use Scenario: Low-power BCM sub-module (e.g., mirror control, seat position memory) operating from 12V battery with cold-crank tolerance.

IC Role / Device Role / Timing Role: Secondary buck converter generating 5V for microcontroller and CAN transceiver from main 12V rail.

Use Value: 4.5–24V input range survives load-dump and cold-crank events; thermal shutdown protects against enclosure overheating.

Use Scenario: Remote radio unit in small-cell base station requiring isolated 12V auxiliary rail from 48V backplane.

IC Role / Device Role / Timing Role: Point-of-load converter supplying 12V @ 500mA to fan controller and monitoring ICs.

Use Value: High efficiency (>90% at 0.3A) reduces heat in sealed enclosures; cycle-by-cycle current limit handles surge loads from cooling fans.

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 1A output current, 2.2MHz switching, smaller 0.25Ω R_DS(ON), same TSOT23-6 package	Supports higher load currents and faster transient response; requires smaller inductor (2.2µH typical)	Select MP2331H for new designs needing >0.5A or higher efficiency at light loads
TPS62231DRYR	0.6A output, 3MHz switching, 0.8V FB, 2.5–6V input range, WSON-6 package	Narrower input range limits use to USB or regulated 5V sources; higher frequency enables ultra-compact layout	Choose TPS62231DRYR only where input is strictly 5V and board space is critical

Compared with MP2357DJ-LF-P, MP2331H offers higher current capability and efficiency for future-proof designs, while TPS62231DRYR trades input flexibility for ultra-small footprint - making MP2357DJ-LF-P optimal for cost-sensitive 4.5–24V industrial applications requiring proven reliability and minimal external components.

Availability

MP2357DJ-LF-P is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-powered peripherals, and automotive body control modules requiring stable component supply and long-term manufacturability.

Supply support for MP2357DJ-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, motor drive, and automotive applications.

The MP23xx series targets cost-sensitive, space-constrained DC/DC conversion in industrial and consumer systems, emphasizing integration, thermal robustness, and ease of use with minimal external components.

FAQ

What is the recommended minimum inductor value for MP2357DJ-LF-P?

A 1µH to 10µH inductor is recommended, with 4.7µH being typical for 12V-to-3.3V conversion at 500mA. Inductor DCR should be below 200mΩ for best efficiency, and saturation current rating must exceed 0.625A (1.25× 0.5A peak load) to avoid core saturation under full load.

Can MP2357DJ-LF-P operate without an external bootstrap diode?

Yes - the internal bootstrap circuit functions without an external diode for most applications. An external IN4148 diode from VOUT to BST is optional and only beneficial when duty cycle exceeds 65% (e.g., 5V or 3.3V output from 5V or 7V input), improving gate drive margin and efficiency.

Is MP2357DJ-LF-P RoHS compliant and halogen-free?

Yes - the "-LF" suffix denotes lead-free and RoHS-compliant packaging per EU Directive 2011/65/EU. The device meets JEDEC J-STD-020 moisture sensitivity level MSL3 and is halogen-free per IEC 61249-2-21.

How does the frequency foldback feature protect the device during overload?

When FB voltage drops below 250mV (indicating severe overload or short circuit), the oscillator frequency reduces from 1.4MHz to 460kHz. This lowers switching losses and peak inductor current, limiting thermal stress and enabling safe current-limit operation until fault clears or thermal shutdown activates.

What is the maximum allowable continuous output current at 85°C ambient?

At TA = +85°C, the maximum continuous output current is ~0.35A due to thermal derating. With θJA = 220°C/W and TJ(MAX) = 150°C, power dissipation is limited to 145mW, constraining usable current based on VOUT, VIN, and efficiency - consult thermal simulation or bench validation for specific layout conditions.

Does MP2357DJ-LF-P support forced PWM or power-save mode?

No - MP2357DJ-LF-P operates exclusively in fixed-frequency PWM mode. It does not include pulse-skipping or burst-mode functionality. Light-load efficiency is maintained via low quiescent current (0.8mA typical), but switching frequency remains constant regardless of load.

What is the purpose of the exposed pad on the TSOT23-6 package?

The exposed pad is electrically connected to GND and serves as a primary thermal path to the PCB. It must be soldered to a dedicated thermal pad with ≥4 thermal vias to an internal ground plane to achieve rated power dissipation (0.57W) and maintain junction temperature within specification.

MP2357DJ-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:: 500mA

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

MP2357DJ-LF-P FAQ

1.How can I place an order for MP2357DJ-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2357DJ-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 MP2357DJ-LF-P reliable?

The price and inventory of MP2357DJ-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 MP2357DJ-LF-P is usually 5 days.

3.What payment methods are accepted for MP2357DJ-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2357DJ-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2357DJ-LF-P?

MP2357DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2357DJ-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 MP2357DJ-LF-P?

For technical support, including MP2357DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2357DJ-LF-P requirements.

6.How does Aetrix verify that MP2357DJ-LF-P is sourced from the original manufacturer or authorized distributors?

All MP2357DJ-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 MP2357DJ-LF-P meets industry standards.

7.What is the process for return or replacement of MP2357DJ-LF-P?

All MP2357DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2357DJ-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 MP2357DJ-LF-P part is unused and in its original packaging.

Return procedure for MP2357DJ-LF-P:

1.Submit a request within 90 days.

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

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