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Monolithic Power Systems Inc. MP2359DT-LF-Z
- Part No.:
- MP2359DT-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MP2359DT-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1.2A SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,454
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Product details
Overview
MP2359DT-LF-Z 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 targets compact power rails in battery-powered industrial sensors and distributed power systems.
For engineers reviewing the MP2359DT-LF-Z datasheet, MP2359DT-LF-Z pinout, MP2359DT-LF-Z application, or MP2359DT-LF-Z equivalent, key selection criteria include thermal shutdown at 150°C, cycle-by-cycle overcurrent protection, 0.1μA shutdown quiescent current, and TSOT23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The MP2359DT-LF-Z implements peak-current-mode control with internal slope compensation, enabling fast transient response and stable loop behavior without external compensation. Its error amplifier compares FB voltage against a 0.81V bandgap reference and drives PWM comparator input.
Bootstrap circuitry (BST pin) supplies gate drive above VIN for the integrated high-side switch; operation requires a 10nF capacitor between BST and SW. Frequency foldback activates below 250mV FB voltage to limit current during short-circuit faults.
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 generation of 1.8V, 2.5V, 3.3V, or 5V logic rails. |
| Switching Frequency | Fixed 1.4MHz - allows use of small external inductors (e.g., 4.7µH) and ceramic capacitors for compact designs. |
| Peak Output Current | 1.2A - sufficient for powering microcontrollers, RF modules, and sensor interfaces in portable equipment. |
| Internal MOSFET RDS(ON) | 0.35Ω - reduces conduction loss and improves efficiency up to 92% at mid-load under 12V input. |
| Shutdown Quiescent Current | 0.1μA - enables ultra-low-power standby in battery-backed systems with long shelf life. |
| Thermal Shutdown Threshold | 150°C - protects die integrity during sustained overload or poor PCB thermal design. |
Pinout & Package
MP2359DT-LF-Z is housed in a RoHS-compliant SOT23-6 package (JEDEC MO-193 AB), with 1.30mm body height and 0.95mm pitch. Thermal resistance θJA is 220°C/W on standard 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap Supply | Connects to SW via 0.1µF capacitor to generate floating gate drive voltage for high-side MOSFET. |
| 2 GND | Power Ground Reference | Primary return path for feedback and control circuits; must be routed outside high-current D1–C1 loop to avoid noise coupling. |
| 3 FB | Feedback Input | Senses output voltage via resistor divider; 0.81V reference sets regulation point; triggers foldback below 250mV. |
| 4 EN | Enable Control | Logic-level input: ≥1.2V enables regulator; ≤0.4V disables with 0.1μA shutdown current. |
| 5 IN | Main Power Input | Accepts 4.5V–24V unregulated supply; requires local 4.7µF ceramic decoupling to suppress switching transients. |
| 6 SW | Switch Node | Drives external Schottky diode (e.g., B230A) and inductor; carries high dv/dt switching waveform. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with low-ESR ceramics | Eliminates need for electrolytic or tantalum output capacitors-reduces board area and improves reliability. |
| Cycle-by-cycle overcurrent protection | Detects per-cycle peak inductor current exceeding 1.8A, preventing MOSFET failure during output shorts. |
| Integrated bootstrap circuit | Enables self-biased high-side gate drive without external charge pump, simplifying layout and reducing BOM count. |
| Wide input voltage range | Supports direct connection to 12V/24V industrial buses or Li-ion/LiPo battery stacks without intermediate regulators. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and restarts only after cooling by ≥15°C, preventing thermal cycling damage. |
Applications
| Industrial Sensor Node Power | Battery-Powered WLED Driver |
|---|---|
|
Use Scenario: Powering low-power MCU, analog front-end, and wireless transceiver in remote environmental monitoring node. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3V rail from 12V solar-charged battery pack. Use Value: 0.1μA shutdown current extends battery life; 1.4MHz switching enables <5mm² total solution size including inductor and caps. |
Use Scenario: Driving three-series white LEDs from 6–12V input in portable lighting or display backlight. IC Role / Device Role / Timing Role: Constant-voltage buck converter with external current-sense resistor replacing linear LED driver. Use Value: Up to 92% efficiency avoids thermal derating; adjustable VOUT supports 9–12V LED string configurations. |
| Distributed Pre-Regulator | Embedded System Point-of-Load |
|
Use Scenario: Intermediate 5V rail generation before LDOs feeding FPGA I/O banks and memory interfaces. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing heat load on downstream linear regulators. Use Value: 0.35Ω RDS(ON) limits conduction loss; 1.2A capability supports burst-mode loads up to 1A peak. |
Use Scenario: Compact 1.8V or 2.5V supply for ARM Cortex-M microcontroller core in space-limited IoT gateway. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured with precision 1% feedback resistors. Use Value: 0.81V reference tolerance (±2.5%) ensures accurate output setting; current-mode control maintains stability across load steps. |
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 output, 2.2MHz switching, smaller 2x2mm QFN-8 package, lower 0.15Ω RDS(ON). | Requires different PCB footprint and higher-frequency magnetics; better suited for high-density consumer electronics. | Select when >1.2A load or tighter board area constraints exist; not drop-in compatible due to pinout and package change. |
| LM2678SD-ADJ/NOPB | 5A output, 260kHz fixed frequency, SO-8 package, external MOSFET required, no BST pin. | Needs external high-side switch and larger inductor; designed for high-power industrial supplies, not compact portable use. | Choose for robust 5A applications where thermal margin and cost outweigh size constraints; incompatible pinout and control architecture. |
Compared with MP2359DT-LF-Z, MP2331HDD-LF-Z offers higher performance in smaller area but demands layout redesign, while LM2678SD-ADJ/NOPB delivers greater current at lower frequency but increases system size and component count.
Availability
MP2359DT-LF-Z is available at Aetrix Electronics and suitable for industrial sensor nodes, battery-powered LED drivers, and embedded point-of-load converters requiring stable component supply and long-term manufacturability.
Supply support for MP2359DT-LF-Z 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 MP23xx series targets cost-sensitive, space-constrained DC/DC conversion needs in battery-operated and distributed power systems, emphasizing integration, efficiency, and ease of use with minimal external components.
FAQ
What is the maximum recommended output current for MP2359DT-LF-Z?
The device delivers up to 1.2A continuous output current under typical conditions (TA = +25°C, 12V input, 3.3V output). At higher ambient temperatures or elevated input voltages (e.g., 24V), thermal limits reduce practical current to ~0.8A unless PCB copper area and airflow are optimized per the datasheet's θJA = 220°C/W specification.
Can MP2359DT-LF-Z operate with ceramic output capacitors only?
Yes-its current-mode control and internal compensation are explicitly designed for stability with low-ESR ceramic capacitors. The datasheet confirms stable operation using 22µF X5R/X7R ceramics without additional ESR or damping networks, eliminating need for bulk electrolytics.
Is an external bootstrap diode required for MP2359DT-LF-Z?
No-it operates reliably with only the internal bootstrap circuit and a 0.1µF BST–SW capacitor. An external diode (e.g., IN4148) is optional and recommended only when VOUT is 3.3V or 5V and duty cycle exceeds 65%, to improve gate drive efficiency under high-VIN/low-VOUT conditions.
What happens during output short-circuit condition?
When FB voltage drops below 250mV, the oscillator frequency folds back from 1.4MHz to 460kHz, reducing average switch current and limiting power dissipation. Simultaneously, cycle-by-cycle current limiting caps peak inductor current at 1.8A, preventing MOSFET thermal runaway.
How does the EN pin interface with microcontroller GPIO?
The EN pin accepts standard 3.3V or 5V logic levels: pull above 1.2V (e.g., direct MCU GPIO HIGH) to enable; pull below 0.4V (e.g., GPIO LOW or open-drain N-channel FET) to disable. Input current remains ≤0.1μA in shutdown, making it compatible with ultra-low-power wake-up schemes.
Does MP2359DT-LF-Z support adjustable soft-start?
No-soft-start is not user-adjustable. The device incorporates internal soft-start that controls output voltage ramp rate during enable, limiting inrush current and preventing overshoot. Typical startup time to 90% VOUT is ~1ms with 10µF output capacitance.
What is the minimum recommended inductor value for MP2359DT-LF-Z?
The datasheet specifies 1µH as the minimum inductance for stable operation. For 1.2A loads at 1.4MHz, a 4.7µH inductor (e.g., Wurth 7440530047) is recommended to maintain ≤30% peak-to-peak ripple current and optimize efficiency across input voltage range.
MP2359DT-LF-Z 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-Z FAQ
1.How can I place an order for MP2359DT-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2359DT-LF-Z 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-Z reliable?
The price and inventory of MP2359DT-LF-Z 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-Z is usually 5 days.
3.What payment methods are accepted for MP2359DT-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2359DT-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2359DT-LF-Z?
MP2359DT-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2359DT-LF-Z 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-Z?
For technical support, including MP2359DT-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2359DT-LF-Z requirements.
6.How does Aetrix verify that MP2359DT-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2359DT-LF-Z 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-Z meets industry standards.
7.What is the process for return or replacement of MP2359DT-LF-Z?
All MP2359DT-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2359DT-LF-Z, 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-Z part is unused and in its original packaging.
Return procedure for MP2359DT-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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