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Monolithic Power Systems Inc. MP2354DS-LF-Z
- Part No.:
- MP2354DS-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2354DS-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,637
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Product details
Overview
MP2354DS-LF-Z from Monolithic Power Systems is a monolithic 2A, 23V input, 380kHz synchronous step-down DC/DC converter in an 8-pin SOIC package, featuring internal 0.18Ω high-side MOSFET and 10Ω low-side switch, fixed-frequency current-mode control, and thermal shutdown protection. It delivers stable 2A continuous output across 4.75–23V input for battery chargers and distributed power systems.
For engineers reviewing the MP2354DS-LF-Z datasheet, MP2354DS-LF-Z pinout, MP2354DS-LF-Z application, or MP2354DS-LF-Z equivalent, key selection criteria include its 380kHz fixed switching frequency, programmable UVLO via RUN pin, SYNC input for external clock synchronization, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP2354DS-LF-Z implements peak current-mode control with slope compensation to stabilize operation above 40% duty cycle and prevent subharmonic oscillation. Its transconductance error amplifier (700μA/V typical) drives the COMP pin, which interfaces directly with the current comparator and supports full-loop compensation via external R-C networks.
It integrates bootstrap circuitry with internal 5V supply for high-side gate drive, requires external Schottky diode for low-loss freewheeling, and uses a dedicated SYNC pin accepting 445–600kHz square-wave inputs with <20ns rise time to force oscillator reset and synchronize switching edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 23V - supports wide-input industrial and battery-powered systems without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering FPGAs, microcontrollers, and peripheral rails in embedded systems. |
| Switching Frequency | 380kHz fixed (±9%) - enables compact magnetics while avoiding AM band interference. |
| Feedback Reference Voltage | 1.222V ±2.4% - sets output voltage accuracy via external resistor divider; enables 2.5V–12V outputs. |
| High-Side RDS(ON) | 0.18Ω - minimizes conduction loss at full load, supporting >95% efficiency at mid-load conditions. |
| Thermal Shutdown Threshold | 155°C - protects against sustained overload or poor PCB thermal design without latch-off. |
| Shutdown Quiescent Current | 20μA - enables ultra-low-power standby in battery-critical applications. |
Pinout & Package
MP2354DS-LF-Z is housed in an 8-pin SOIC (SOIC8) package with exposed pad not present; θJA = 105°C/W on 1"² 1 oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SYNC | Synchronization input | Accepts external 445–600kHz square wave to align switching edges; internal 11kΩ pull-down enables default free-running mode. |
| 2 BST | Bootstrap supply node | Connects external 0.1μF ceramic capacitor between BST and LX to generate floating gate drive voltage for high-side MOSFET. |
| 3 VIN | Main power input | Supplies 4.75–23V unregulated input; requires local 10μF ceramic decoupling to suppress high-frequency switching noise. |
| 4 LX | Switch node | Drives external inductor; connects to VIN via high-side switch or GND via low-side switch; high dv/dt node requiring tight layout. |
| 5 GND | Analog and power ground reference | Common return for FB, COMP, RUN, and internal circuits; must be isolated from high-current paths to avoid feedback noise injection. |
| 6 FB | Feedback input | Monitors output voltage via resistive divider; triggers frequency foldback below 700mV during short-circuit events. |
| 7 COMP | Error amplifier output / current comparator input | Interface for loop compensation network (R-C to GND); directly controls peak inductor current and transient response. |
| 8 RUN | Enable and UVLO control | Starts regulation when >2.62V; shuts down below 0.7V; supports programmable UVLO using resistor divider from VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side switches | 0.18Ω high-side + 10Ω low-side MOSFETs eliminate external switch count and simplify BOM for compact designs. |
| Ceramic-capacitor compatible | Stable with low-ESR ceramic output caps (e.g., 22μF X5R/X7R), reducing board area and eliminating electrolytic aging concerns. |
| Programmable UVLO | RUN pin accepts resistor divider from VIN to set custom turn-on threshold, enabling precise brown-in/brown-out control. |
| External clock synchronization | SYNC pin allows deterministic timing alignment across multiple converters, critical for EMI reduction in multi-rail systems. |
| Current-limit foldback under fault | Reduces switching frequency to 35kHz when FB < 700mV, lowering power dissipation during sustained overloads or shorts. |
Applications
| Portable Battery Charger | Distributed Telecom Power |
|---|---|
|
Use Scenario: Step-down conversion from 12V/19V adapter or Li-ion pack to 3.3V/5V for USB charging ICs and PMICs. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated intermediate rail; operates at fixed 380kHz to minimize filter size. Use Value: Internal 0.18Ω MOSFET and 2A rating enable single-chip solution for dual-port 5V/2A chargers without external switches or heatsinking. |
Use Scenario: Intermediate 5V or 12V generation from 24V or 48V telecom backplane in remote radio units and edge nodes. IC Role / Device Role / Timing Role: Pre-regulator feeding LDOs or point-of-load converters; synchronized via SYNC to reduce conducted EMI. Use Value: Wide 4.75–23V input range accommodates fluctuating 24V supplies; thermal shutdown prevents field failure under airflow-limited enclosures. |
| Industrial Sensor Node Power | Automotive Aftermarket Display |
|
Use Scenario: Powering 3.3V MCU, RF transceiver, and analog front-end from 9–18V vehicle battery or 12V industrial bus. IC Role / Device Role / Timing Role: Main system regulator with programmable UVLO to survive cold-crank (down to 6V) and load-dump transients. Use Value: RUN pin UVLO configuration ensures reliable startup only above safe operating voltage; 20μA shutdown current extends battery life in sleep modes. |
Use Scenario: Converting 12V automotive supply to 5V for LCD backlight drivers and HDMI interface logic in infotainment displays. IC Role / Device Role / Timing Role: High-efficiency buck stage operating continuously under variable ambient temperatures (–40°C to +85°C). Use Value: Stable ceramic-capacitor operation eliminates electrolytic leakage and capacitance drift, ensuring consistent brightness control over 10+ year lifespan. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2392DJ-LF-Z | Successor device with 4A output, 500kHz switching, improved light-load efficiency, and integrated boot diode; pin-compatible but requires updated compensation. | Supports higher current loads and tighter EMI requirements; not drop-in due to different COMP network values and higher fSW. | Select when upgrading legacy designs for increased power density or regulatory EMI compliance. |
| LM2678SD-5.0/NOPB | TI part with 5A output, 260kHz fSW, external MOSFETs, and different control architecture (voltage-mode); no SYNC or programmable UVLO. | Requires external high- and low-side FETs and more complex compensation; suited for cost-sensitive, non-synchronized 5V-only systems. | Select only if 5V fixed-output and lower BOM cost outweigh need for integration and synchronization capability. |
Compared with MP2354DS-LF-Z, MP2392DJ-LF-Z offers higher current and modern features but mandates layout and compensation updates, while LM2678SD-5.0/NOPB trades integration for flexibility and cost-neither is a direct replacement without design revision.
Availability
MP2354DS-LF-Z is available at Aetrix Electronics and suitable for distributed power systems, battery chargers, and pre-regulator applications requiring stable component supply amid end-of-life transitions.
Supply support for MP2354DS-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP2354 belongs to MPS's legacy high-voltage buck converter product line, designed for industrial and telecom systems needing robust, integrated 2A regulation with minimal external components.
FAQ
Is MP2354DS-LF-Z still in active production?
No-MP2354DS-LF-Z is officially marked End of Life (EOL) by Monolithic Power Systems, with MP2392 designated as its functional successor. Aetrix Electronics maintains limited legacy stock for last-time buys and design continuity support, but new designs should migrate to MP2392DJ-LF-Z.
What is the maximum achievable output voltage with MP2354DS-LF-Z?
The MP2354DS-LF-Z supports output voltages up to 20V, constrained by the absolute maximum feedback voltage (6V) and practical limits of the external resistor divider. For example, using R2 = 10kΩ and R1 = 154kΩ yields VOUT ≈ 20V (VFB = 1.222V × (1 + 154k/10k)), provided the inductor and output capacitor ratings exceed this level.
Can MP2354DS-LF-Z operate without an external Schottky diode?
No-the MP2354DS-LF-Z lacks a synchronous rectifier low-side MOSFET and relies on an external Schottky diode (e.g., SR22, B230) for freewheeling current path during high-side switch off-time. Omitting it causes catastrophic failure due to inductive kickback and lack of current path.
How does the RUN pin UVLO differ from the EN pin in other buck converters?
The RUN pin combines enable function and adjustable UVLO: rising threshold is 2.5V (typ), hysteresis is 210mV, and pull-up current is 1.3μA (typ). Unlike dedicated EN pins, RUN also sinks current during shutdown (<700mV), enabling precise brown-out recovery and compatibility with RC-based delay circuits for sequencing.
Why does MP2354DS-LF-Z specify two different RDS(ON) values?
It specifies 0.18Ω for the high-side MOSFET (critical for conduction loss during on-time) and 10Ω for the low-side MOSFET (used only for bootstrap capacitor charging during light load and providing a controlled discharge path). The 10Ω value reflects intentional design for gate-drive efficiency-not power handling-and is not used for main current conduction.
What layout guidance applies to the BST and LX pins?
BST and LX form a high dv/dt switching node; the BST capacitor (0.1μF ceramic) must be placed within 2mm of BST and LX pins with minimum loop area. Avoid routing sensitive traces (FB, COMP, RUN) near LX, and use a solid ground plane beneath the IC to contain EMI and stabilize bootstrap coupling.
Does MP2354DS-LF-Z support output voltages below 2.5V?
Yes-though the datasheet highlights 2.5V–12V, the 1.222V feedback reference allows outputs as low as 1.25V using precision resistors (e.g., R2 = 10kΩ, R1 = 200Ω → VOUT ≈ 1.43V). Stability must be verified with ceramic output caps, as low-VOUT designs increase ripple sensitivity and require careful COMP compensation.
MP2354DS-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 1.222V
- Voltage - Output (Max):
- 20.7V
- Current - Output:
- 2A
- Frequency - Switching:
- 380kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP2354DS-LF-Z FAQ
1.How can I place an order for MP2354DS-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2354DS-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 MP2354DS-LF-Z reliable?
The price and inventory of MP2354DS-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 MP2354DS-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2354DS-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2354DS-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2354DS-LF-Z?
MP2354DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2354DS-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 MP2354DS-LF-Z?
For technical support, including MP2354DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2354DS-LF-Z requirements.
6.How does Aetrix verify that MP2354DS-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2354DS-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 MP2354DS-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2354DS-LF-Z?
All MP2354DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2354DS-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 MP2354DS-LF-Z part is unused and in its original packaging.
Return procedure for MP2354DS-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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