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Monolithic Power Systems Inc. MP2359DT-LF-P
- Part No.:
- MP2359DT-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MP2359DT-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1.2A SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,789
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Product details
Overview
MP2359DT-LF-P from Monolithic Power Systems is a monolithic 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 - deployed in battery-powered industrial sensors and distributed power rails.
For engineers reviewing the MP2359DT-LF-P datasheet, MP2359DT-LF-P pinout, MP2359DT-LF-P application, or MP2359DT-LF-P equivalent, this device supports fast transient response via current-mode control, includes cycle-by-cycle overcurrent protection and thermal shutdown, and operates with low-ESR ceramic capacitors for compact point-of-load regulation.
Technical Context
The MP2359DT-LF-P implements a current-mode buck architecture with internal slope compensation, where the error amplifier output directly controls peak inductor current. Its 1.4MHz oscillator enables small external passive components while maintaining stability under wide load and line variations.
Bootstrap gate drive (BST pin) supplies the high-side MOSFET driver above VIN, requiring an external 0.1µF capacitor between BST and SW. Feedback regulation uses a precision 0.81V reference with ±2% tolerance over temperature, and EN pin logic thresholds (1.2V high, 0.4V low) support direct microcontroller interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports 12V/24V industrial rails and wide-range battery inputs without pre-regulation. |
| Output Voltage Range | 0.81V to 15V - set by external resistor divider; 0.81V reference enables low-voltage core supply generation. |
| Switching Frequency | Fixed 1.4MHz - allows use of sub-5mm inductors and reduces output ripple without external frequency programming. |
| Peak Output Current | 1.2A - sustained delivery with thermal shutdown at 150°C junction temperature and 220°C/W θJA in TSOT23-6. |
| Internal MOSFET RDS(ON) | 0.35Ω - minimizes conduction loss at 1A, enabling >92% efficiency at 12V→5V/1A operation. |
| Shutdown Quiescent Current | 0.1μA - extends battery life in always-on systems with enable-controlled sleep mode. |
| Feedback Voltage Accuracy | ±2% (0.790V–0.830V) - ensures tight output regulation across -40°C to +85°C ambient. |
Pinout & Package
MP2359DT-LF-P is housed in a RoHS-compliant SOT23-6 package (JEDEC MO-193 AB), with 1.30mm max height, 2.9mm × 1.6mm footprint, and exposed pad not electrically connected. Pin 1 is bottom-left when top marking "J6" is read left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BST) | Bootstrap Supply | Connects external 0.1µF capacitor to SW to generate floating gate drive voltage for high-side MOSFET. |
| 2 (GND) | Power Ground | Primary return path for switch current and feedback reference; requires dedicated low-impedance PCB copper pour. |
| 3 (FB) | Feedback Input | Senses output voltage via resistor divider; internal 0.81V reference sets regulation point with <0.1µA bias current. |
| 4 (EN) | Enable Control | Logic-level input: ≥1.2V enables regulator; ≤0.4V disables with 0.1µA shutdown current. |
| 5 (IN) | Input Supply | Accepts 4.5V–24V unregulated input; requires local 4.7µF ceramic decoupling near pin. |
| 6 (SW) | Switch Node | Drives external Schottky diode and inductor; high dv/dt node requiring short, low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with ceramic output capacitors | Eliminates need for electrolytic or tantalum caps; enables compact, long-life designs with X5R/X7R 22µF parts. |
| Cycle-by-cycle overcurrent protection | Detects 1.8A switch current limit per cycle, preventing inductor saturation and MOSFET failure during shorts. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and restarts only after cooling by ≥20°C, avoiding thermal oscillation. |
| Frequency foldback under fault | Reduces switching frequency to 460kHz when FB <250mV, lowering power dissipation during output short conditions. |
| Low EMI layout support | Integrated bootstrap diode driver and minimized high-di/dt loop area reduce conducted emissions in Class B applications. |
Applications
| Industrial Sensor Node Power | USB-C Powered Peripherals |
|---|---|
|
Use Scenario: Powering 3.3V MCU, RF transceiver, and analog front-end from a 12V field bus or Li-ion battery pack. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 3.3V at up to 1.2A with fast load-step response for burst-mode wireless transmission. Use Value: 1.4MHz operation enables 4.7µH inductor and 22µF ceramic output cap, reducing board area by 40% vs. 500kHz alternatives. |
Use Scenario: Generating 5V rail from USB-C PD source (5–20V) for portable test equipment with display and data logging. IC Role / Device Role / Timing Role: Input-flexible pre-regulator stepping down variable PD voltage to stable 5V before LDO post-regulation. Use Value: 4.5V–24V input range accommodates full USB-C PD profile; 0.1µA shutdown current preserves host battery during idle. |
| White LED Driver for HMI | Pre-regulator for Linear Regulators |
|
Use Scenario: Driving three parallel WLED strings (3×20mA) from 6–12V automotive supply in dashboard backlighting. IC Role / Device Role / Timing Role: Constant-voltage buck converter with external current-sense resistors setting LED string voltage. Use Value: Fixed 1.4MHz frequency avoids audible noise; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Use Scenario: Reducing 12V or 24V system rail to 3.3V or 5V intermediate voltage before low-noise LDOs powering ADCs or clocks. IC Role / Device Role / Timing Role: High-efficiency pre-regulator minimizing heat dissipation compared to linear solution alone. Use Value: 0.35Ω RDS(ON) and >92% efficiency at 1A cut pre-LDO power loss by >75%, enabling smaller heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2331HDD-LF-Z | Higher 2A rating, 2.2MHz switching, improved light-load efficiency, same SOT23-6 package. | Supports higher current loads and tighter size constraints; replaces MP2359 in new designs per MPS notice. | Select when >1.2A output or faster transient response is required; pinout-compatible but requires updated compensation. |
| TPS562201DDCR | TI part: 2A, 500kHz–1.7MHz adjustable frequency, 3.8V–17V input, 0.6V reference, different pinout. | Offers frequency synchronization and soft-start control; lacks BST pin, requiring external high-side driver for >17V input. | Choose for synchronized multi-rail systems or where TI ecosystem tooling (WEBENCH) is mandated; not drop-in. |
Compared with MP2359DT-LF-P, MP2331HDD-LF-Z delivers higher current and frequency in identical packaging for next-gen designs, while TPS562201DDCR provides design flexibility at the cost of layout redesign and no bootstrap capability above 17V.
Availability
MP2359DT-LF-P is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-C peripheral power, WLED backlighting, and pre-regulator circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MP2359DT-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, headquartered in California and serving global industrial, automotive, and computing markets since 1997.
The MP2359 belongs to MPS's mainstream DC/DC converter product line, designed for cost-sensitive, space-constrained applications requiring robust integration, wide input range, and minimal external components.
FAQ
What is the maximum recommended output current for MP2359DT-LF-P at 24V input?
The MP2359DT-LF-P sustains 1.2A continuous output current across its full 4.5V–24V input range. At 24V input, thermal limits require proper PCB copper area (≥1 cm² on GND pad) and ambient ≤65°C to maintain reliability; derating to 1.0A is advised for extended 85°C operation.
Can MP2359DT-LF-P operate with 3.3V input?
No. The MP2359DT-LF-P has a minimum input voltage of 4.5V due to internal UVLO threshold (2.5–3.1V rising) and gate drive requirements. Operation below 4.5V will cause startup failure or erratic regulation; use MP2307 or MP2317 for sub-4.5V inputs.
Is an external bootstrap diode required for MP2359DT-LF-P?
An external bootstrap diode (e.g., IN4148) is optional and recommended only when VOUT ≥3.3V and duty cycle exceeds 65% (e.g., 12V→3.3V). It improves efficiency by reducing BST capacitor discharge loss, but the internal charge pump suffices for most 5V/12V outputs.
What is the purpose of the frequency foldback feature?
When FB voltage drops below 250mV (indicating severe overload or short circuit), the MP2359DT-LF-P reduces switching frequency from 1.4MHz to 460kHz. This lowers average switch stress and power dissipation, allowing safe operation during fault conditions until thermal shutdown activates.
How does the EN pin behave during power-up?
The EN pin has 1.2V turn-on and 0.4V turn-off thresholds with 150mV hysteresis. During power-up, the device remains disabled until VIN exceeds UVLO (2.8V typical) and EN rises above 1.2V. A 100kΩ pull-up to VIN enables automatic start-up without external control.
What output capacitor ESR is acceptable for stable operation?
The MP2359DT-LF-P is optimized for low-ESR ceramic capacitors (X5R/X7R); ESR <10mΩ is ideal. Electrolytic or tantalum caps with ESR >50mΩ may cause instability or excessive output ripple. A 22µF 0805 X7R ceramic capacitor meets all stability and ripple requirements.
MP2359DT-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-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:
- SOT-23-6
MP2359DT-LF-P FAQ
1.How can I place an order for MP2359DT-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2359DT-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 MP2359DT-LF-P reliable?
The price and inventory of MP2359DT-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 MP2359DT-LF-P is usually 5 days.
3.What payment methods are accepted for MP2359DT-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2359DT-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2359DT-LF-P?
MP2359DT-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2359DT-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 MP2359DT-LF-P?
For technical support, including MP2359DT-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2359DT-LF-P requirements.
6.How does Aetrix verify that MP2359DT-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2359DT-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 MP2359DT-LF-P meets industry standards.
7.What is the process for return or replacement of MP2359DT-LF-P?
All MP2359DT-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2359DT-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 MP2359DT-LF-P part is unused and in its original packaging.
Return procedure for MP2359DT-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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