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Monolithic Power Systems Inc. MP2359DJ-LF-Z
- Part No.:
- MP2359DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP2359DJ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1.2A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,799
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Product details
Overview
MP2359DJ-LF-Z 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. It operates in current-mode control for fast transient response and includes cycle-by-cycle overcurrent protection and thermal shutdown-used in compact WLED drivers and pre-regulator stages.
For engineers reviewing the MP2359DJ-LF-Z datasheet, MP2359DJ-LF-Z pinout, MP2359DJ-LF-Z application, or MP2359DJ-LF-Z equivalent, key selection criteria include its TSOT23-6 footprint, 0.1μA shutdown current, ±2.5% feedback voltage accuracy, bootstrap gate drive architecture, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP2359DJ-LF-Z implements a current-mode buck topology with internal slope compensation and a 1.4MHz oscillator, enabling stable operation with minimal external components. Its error amplifier compares FB voltage against a 0.81V bandgap reference, while the PWM comparator integrates sensed inductor current and ramp compensation to regulate peak current per cycle.
Bootstrap capacitor coupling between SW and BST pins enables high-side MOSFET gate drive above VIN, supporting duty cycles up to 87%. The EN pin provides logic-level on/off control with 1.2V turn-on threshold and sub-1μA quiescent draw in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide industrial and automotive supply rails without pre-regulation |
| Output Voltage Range | 0.81V to 15V - set via external resistor divider; enables 3.3V, 5V, or 12V system rails |
| Switching Frequency | 1.4MHz (typ) - allows use of small 4.7µH inductors and reduces EMI filter size |
| Peak Output Current | 1.2A - sufficient for powering microcontrollers, sensors, or LED strings in space-constrained designs |
| Feedback Voltage Accuracy | ±2.5% at 25°C - ensures tight output regulation under varying load and temperature conditions |
| Shutdown Current | 0.1μA - enables ultra-low-power battery-backed standby modes |
| Internal MOSFET RDS(ON) | 0.35Ω - minimizes conduction loss and improves efficiency at mid-load currents |
Pinout & Package
MP2359DJ-LF-Z is housed in a thermally enhanced TSOT23-6 package (2.9mm × 1.6mm × 0.85mm), optimized for high power density and PCB area efficiency. The exposed pad variant improves thermal dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – BST | Bootstrap supply | Connects to SW through 0.1µF capacitor to generate floating gate drive voltage for high-side MOSFET |
| 2 – GND | Power and signal ground | Reference node for feedback and internal circuitry; must be routed outside high-current diode return path |
| 3 – FB | Output voltage feedback | Senses resistive divider output; internal 0.81V reference sets regulation point; foldback activates below 250mV |
| 4 – EN | Enable control input | Logic-compatible 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 |
| 6 – SW | Switch node | Drives external Schottky diode (or synchronous rectifier); connects to inductor and BST capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Stable with ceramic output capacitors | Eliminates need for electrolytic or tantalum caps-reduces board area and improves reliability |
| Fixed 1.4MHz switching frequency | Enables consistent EMI filtering design and predictable inductor sizing across applications |
| Cycle-by-cycle overcurrent protection | Prevents MOSFET failure during short-circuit or overload by limiting peak inductor current to 1.8A |
| Thermal shutdown with hysteresis | Disables regulator at 150°C junction temperature and re-enables after ~20°C cooldown |
| 0.1μA shutdown quiescent current | Extends battery life in always-on systems such as IoT sensors or backup power monitors |
Applications
| WLED Backlight Driver | Battery-Powered Pre-Regulator |
|---|---|
|
Use Scenario: Driving 3-series white LEDs from 6V–12V battery input in portable displays. IC Role / Device Role / Timing Role: Constant-current step-down controller with adjustable output voltage and high-frequency switching to minimize visible ripple. Use Value: Enables compact, efficient LED biasing without external current-sense resistors or low-frequency dimming artifacts. |
Use Scenario: Generating stable 3.3V or 5V intermediate rail from variable 9V–24V industrial battery or adapter input. IC Role / Device Role / Timing Role: Primary DC/DC converter providing regulated supply to LDOs or microcontrollers in distributed power architectures. Use Value: Delivers 1.2A at >90% efficiency across wide input range, reducing heat buildup in sealed enclosures. |
| Distributed Power System Node | Industrial Sensor Signal Chain Supply |
|
Use Scenario: Local 5V/1A rail generation on modular I/O cards in PLC backplanes with 24V bus input. IC Role / Device Role / Timing Role: Isolated point-of-load converter minimizing noise coupling into analog measurement circuits. Use Value: TSOT23-6 footprint allows placement near load; 1.4MHz operation eases EMI compliance in dense multi-rail systems. |
Use Scenario: Powering precision ADCs, op-amps, and transducer interfaces requiring clean, low-noise 3.3V supply. IC Role / Device Role / Timing Role: Low-ripple, tightly regulated voltage source with fast load-step response for dynamic sensor excitation. Use Value: Current-mode control and ceramic-capacitor stability ensure <10mV p-p output ripple at full load, preserving SNR. |
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 | Successor device with improved efficiency (up to 94%), lower RDS(ON) (0.22Ω), and extended 4.2V–30V input range | Supports higher input voltages and delivers 1.5A continuous current; recommended for new designs requiring longer lifecycle support | Select MP2331H when upgrading for higher efficiency or wider VIN range; not pin-compatible due to different BST configuration |
| TPS562201 | TI part with 2.5V–17V input, 1.2A rating, and adjustable frequency (400kHz–1.8MHz); uses external compensation | Lacks integrated bootstrap diode path; requires more external components but offers greater loop tuning flexibility | Choose TPS562201 if programmable frequency or custom compensation is required; verify layout compatibility with TSOT23-6 footprint |
Compared with MP2359DJ-LF-Z, MP2331H offers higher efficiency and broader input range but requires redesign for BST routing, while TPS562201 trades integration for design flexibility-making MP2359DJ-LF-Z optimal for cost-sensitive, space-constrained legacy designs where fixed 1.4MHz operation suffices.
Availability
MP2359DJ-LF-Z is available at Aetrix Electronics and suitable for distributed power systems, battery-powered pre-regulators, WLED backlight drivers, and industrial sensor signal chain supplies requiring stable component supply and long-term obsolescence management.
Supply support for MP2359DJ-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, with core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP2359 belongs to MPS's mainstream step-down converter product line, designed for cost-effective, high-density power solutions in consumer, industrial, and automotive applications where small footprint and minimal external components are critical.
FAQ
What is the maximum recommended output current for MP2359DJ-LF-Z at 24V input?
The MP2359DJ-LF-Z delivers up to 1.2A peak output current across its full 4.5V–24V input range. At 24V input and 5V output (duty cycle ~21%), thermal limits allow sustained 1.2A operation with proper PCB copper area and airflow. Derating to 1.0A is advised for ambient temperatures above +70°C or enclosed environments without forced cooling.
Can MP2359DJ-LF-Z operate without an external bootstrap diode?
Yes-the MP2359DJ-LF-Z integrates internal charge pump circuitry and does not require an external bootstrap diode under typical operating conditions. An external diode (e.g., IN4148) is only recommended when VOUT is 3.3V or 5V and duty cycle exceeds 65%, to improve high-side gate drive margin and efficiency.
What is the minimum inductor value recommended for stable operation at 1.4MHz?
A 4.7µH shielded power inductor with ≥1.5A saturation current and ≤36mΩ DCR is recommended. The MP2359DJ-LF-Z supports inductors from 1µH to 10µH; 4.7µH balances ripple current (~30% of max load), size, and efficiency. Lower values increase ripple and stress; higher values reduce ripple but extend transient recovery time.
How does the MP2359DJ-LF-Z handle short-circuit conditions?
Under short-circuit, the MP2359DJ-LF-Z enters frequency foldback mode-reducing switching frequency from 1.4MHz to ~460kHz when FB voltage drops below 250mV. This lowers average power dissipation while maintaining cycle-by-cycle current limiting at 1.8A, preventing thermal runaway and enabling safe auto-recovery once fault clears.
Is MP2359DJ-LF-Z RoHS compliant and halogen-free?
Yes-MP2359DJ-LF-Z carries the "-LF" suffix indicating lead-free, RoHS-compliant packaging per EU Directive 2011/65/EU. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is halogen-free per IEC 61249-2-21, with bromine <900 ppm and chlorine <900 ppm.
What is the purpose of the BST pin, and how should it be connected?
The BST pin provides the floating supply for the high-side MOSFET gate driver. It must be connected to the SW node via a 0.1µF ceramic capacitor (X7R, 16V rating). This capacitor charges during the low-side conduction phase and supplies the gate drive voltage needed to fully enhance the high-side switch above VIN during its on-time.
Does MP2359DJ-LF-Z support forced PWM or power-save mode?
No-the MP2359DJ-LF-Z operates exclusively in forced continuous conduction mode (CCM) using fixed-frequency current-mode control. It does not feature pulse-skipping or discontinuous conduction mode (DCM) for light-load efficiency optimization. Quiescent current remains ~1mA across load range, making it best suited for medium-to-heavy load applications.
MP2359DJ-LF-Z 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-Z FAQ
1.How can I place an order for MP2359DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2359DJ-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 MP2359DJ-LF-Z reliable?
The price and inventory of MP2359DJ-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 MP2359DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2359DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2359DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2359DJ-LF-Z?
MP2359DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2359DJ-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 MP2359DJ-LF-Z?
For technical support, including MP2359DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2359DJ-LF-Z requirements.
6.How does Aetrix verify that MP2359DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2359DJ-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 MP2359DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2359DJ-LF-Z?
All MP2359DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2359DJ-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 MP2359DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP2359DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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