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Monolithic Power Systems Inc. MP2354DS-LF
- Part No.:
- MP2354DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2354DS-LF.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,720
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Product details
Overview
MP2354DS-LF from Monolithic Power Systems is a monolithic 2A, 23V input, 380kHz synchronous step-down DC/DC converter with integrated 0.18Ω high-side MOSFET and 10Ω low-side switch, operating from –40°C to +85°C in SOIC-8 package. It delivers stable output voltage via current-mode control with programmable UVLO, thermal shutdown, and cycle-by-cycle overcurrent protection - used as primary power supply in battery chargers and distributed power systems.
For engineers reviewing the MP2354DS-LF datasheet, MP2354DS-LF pinout, MP2354DS-LF application, or MP2354DS-LF equivalent, key selection criteria include its 4.75–23V input range, fixed 380kHz switching frequency, 1.222V feedback reference, SYNC capability for external clock synchronization, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP2354DS-LF implements current-mode control with internal transconductance error amplifier (GEA = 700μA/V) and slope-compensated current sensing, enabling fast transient response and simplified loop stabilization. Its COMP pin serves as both error amplifier output and current comparator input, supporting external RC compensation networks for stability tuning across varied output capacitor ESR and capacitance values.
It features dual-switch architecture: a 0.18Ω high-side MOSFET and 10Ω low-side switch, with bootstrap-driven gate drive (BST pin) and internal 5V charge pump. The RUN pin enables UVLO programming (2.37–2.62V threshold), while SYNC accepts 445–600kHz external clocks to force oscillator reset and synchronize multiple converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 23V - supports wide-range industrial and battery-powered inputs including 12V and 19V rails. |
| Output Current | 2A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor subsystems. |
| Switching Frequency | 380kHz (±9%) - balances efficiency, EMI, and inductor size; synchronizable up to 600kHz via SYNC pin. |
| Feedback Reference | 1.222V (±2%) - sets output voltage accuracy; enables precise 3.3V, 5V, or custom outputs using resistor dividers. |
| High-Side RDS(on) | 0.18Ω - reduces conduction loss at full load, improving efficiency especially under 12V→3.3V conversion. |
| Thermal Shutdown | 155°C - protects against sustained overload or poor PCB thermal design without latch-off behavior. |
| Quiescent Current | 1.2mA (active), 35μA (shutdown) - enables low-power standby modes in portable equipment. |
Pinout & Package
MP2354DS-LF is housed in an 8-pin SOIC package (SOIC-8, 150°C max junction temperature, θJA = 105°C/W), with exposed pad not present. Pin functions are validated per MP2354 Rev. 1.4 datasheet.
| 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 | Connects floating 5V charge-pump capacitor between BST and LX to drive high-side MOSFET gate above VIN. |
| 3 (VIN) | Main Power Input | Supplies 4.75–23V unregulated input; requires local ceramic decoupling (e.g., 10μF X5R) near pin. |
| 4 (LX) | Switch Node | Drives external inductor; carries high di/dt switching current - demands tight layout to minimize EMI and shoot-through risk. |
| 5 (GND) | Analog & Power Ground | Single-point reference for FB, COMP, and RUN; must be isolated from high-current return paths to avoid noise coupling. |
| 6 (FB) | Feedback Input | Senses divided output voltage; internal 1.222V reference enables accurate regulation; short-circuit foldback activates below 700mV. |
| 7 (COMP) | Compensation Node | Transconductance error amplifier output; connects external RC network to set pole-zero locations for stability and transient response. |
| 8 (RUN) | Enable / UVLO Control | Enables operation above 2.62V; UVLO hysteresis = 210mV; <700mV ensures full shutdown (IQ = 20μA). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switches | 0.18Ω high-side MOSFET + 10Ω low-side switch - eliminates external FETs and drivers, reducing BOM count and layout complexity. |
| Ceramic-Capacitor Compatible | Stable with low-ESR ceramic output caps (e.g., 22μF X5R) - avoids bulk tantalum/electrolytic, improving reliability and temperature performance. |
| Efficiency Optimization | Up to 95% peak efficiency - achieved via low RDS(on), optimized gate drive, and adaptive light-load behavior. |
| Programmable UVLO | Adjustable enable threshold via resistor divider on RUN pin - enables brown-in/brown-out control for system-level power sequencing. |
| Frequency Synchronization | SYNC pin accepts external clock up to 600kHz - essential for noise-sensitive applications and multi-converter phase alignment. |
Applications
| Industrial Battery Charger | Distributed Power System |
|---|---|
|
Use Scenario: Charging 2-cell Li-ion (8.4V max) or 3-cell NiMH (4.5V) packs from 12V or 19V adapter input. IC Role / Device Role / Timing Role: Primary buck regulator delivering constant-current/constant-voltage (CC/CV) charging profile with thermal foldback during high ambient conditions. Use Value: Integrated current limit (3.4A typ.) and thermal shutdown prevent cell damage; 380kHz operation allows compact 15μH inductor and minimal footprint. |
Use Scenario: Point-of-load (POL) conversion in programmable logic controller (PLC) backplane, stepping 24V bus down to 3.3V for I/O modules. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator supplying isolated digital logic rails with minimal heat dissipation in confined enclosures. Use Value: 95% efficiency at 1.5A load reduces thermal load on heatsink-free designs; SYNC capability enables synchronized switching across multiple rails to suppress beat frequencies. |
| Pre-regulator for Linear Regulators | Automotive Aftermarket Display Power |
|
Use Scenario: Reducing 12V automotive input to 5V before LDO stage for noise-sensitive analog sensors or ADC references. IC Role / Device Role / Timing Role: Efficient pre-regulator minimizing dropout and heat generation in cascaded regulator architectures. Use Value: Fixed 380kHz frequency simplifies EMI filtering; low 1.222V FB tolerance (±2%) ensures tight 5V output regulation even with LDO headroom variation. |
Use Scenario: Powering 7-inch TFT LCD display (3.3V, 1.8A) and touch controller in vehicle infotainment unit with 9–16V battery input. IC Role / Device Role / Timing Role: Main DC/DC converter handling cold-crank (6.5V) to load-dump (28V) transients with robust UVLO and thermal management. Use Value: 23V absolute max input rating and 4.75V startup threshold ensure reliable operation across full automotive voltage range; SOIC-8 package supports standard reflow assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2392DD-LF | Successor IC: 3A output, 4.5–36V input, 500kHz switching, improved light-load efficiency, no low-side MOSFET (requires external sync rectifier). | Designed for higher-power or wider-input applications (e.g., 24V industrial rails); lacks integrated low-side switch, increasing BOM but enabling higher efficiency at >2A loads. | Select MP2392DD-LF when upgrading legacy MP2354 designs requiring >2A output or extended input range beyond 23V. |
| LM2678SD-3.3/NOPB | Non-synchronous buck: 5A output, 8–40V input, 260kHz fixed frequency, external Schottky diode required, no SYNC or programmable UVLO. | Higher current capacity but lower efficiency due to diode conduction loss; simpler compensation but less flexible for noise-sensitive systems. | Choose LM2678SD-3.3/NOPB only if cost sensitivity outweighs efficiency needs and external diode layout is acceptable. |
Compared with MP2354DS-LF, MP2392DD-LF offers higher current and input voltage headroom at the cost of added external components, while LM2678SD-3.3/NOPB trades integration for raw current capability and legacy support - making MP2354DS-LF optimal for space-constrained 2A designs needing full integration and synchronization.
Availability
MP2354DS-LF is available at Aetrix Electronics and suitable for industrial battery chargers, distributed power systems, and pre-regulator circuits requiring stable component supply amid end-of-life transitions.
Supply support for MP2354DS-LF 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 interface applications.
The MP2354 belongs to MPS's legacy high-efficiency DC/DC converter product line, designed specifically for compact, thermally constrained applications requiring integrated power switches and robust protection features.
FAQ
Is MP2354DS-LF still in active production?
No - MP2354DS-LF is marked End-of-Life (EOL) by Monolithic Power Systems, with official replacement guidance pointing to MP2392. Aetrix Electronics maintains limited legacy stock for continuity support, but new designs should migrate to MP2392DD-LF or verified alternatives.
What is the maximum achievable output voltage with MP2354DS-LF?
The MP2354DS-LF does not regulate output voltage directly; it sets VOUT via external resistor divider on FB pin. With VFB = 1.222V, practical maximum output is limited by internal switch ratings and thermal constraints - typically ≤15V with adequate heatsinking and proper inductor selection per datasheet Table 4.
Can MP2354DS-LF operate with 100% duty cycle?
No - MP2354DS-LF has a maximum duty cycle of 90% (at VFB = 1.0V). It cannot sustain 100% conduction; minimum off-time is enforced by internal oscillator timing, preventing direct pass-through operation. For dropout-critical applications, consider LDO post-regulation.
Why does MP2354DS-LF require an external bootstrap diode in some cases?
An external bootstrap diode (e.g., BAT54) is recommended when input voltage is fixed at 5V or output exceeds 12V, or when duty cycle >65%. It improves BST capacitor recharge efficiency during high-duty operation, preventing gate drive collapse and ensuring reliable high-side switch turn-on.
How does the MP2354DS-LF handle short-circuit conditions?
Under short-circuit, MP2354DS-LF activates frequency foldback: oscillator frequency drops from 380kHz to ~35kHz when FB voltage falls below 700mV. This reduces power dissipation while maintaining hiccup-like current limiting via cycle-by-cycle peak current detection (3.4A typical limit).
What is the role of the 10Ω low-side MOSFET in MP2354DS-LF?
The 10Ω low-side switch provides synchronous rectification during the off-phase, replacing an external Schottky diode. Though higher RDS(on) than the high-side switch, it enables >90% efficiency at medium-to-heavy loads and eliminates reverse recovery losses - critical for high-frequency operation.
Does MP2354DS-LF support forced PWM mode?
No - MP2354DS-LF operates exclusively in current-mode PWM with automatic pulse-skipping at light loads. It lacks a MODE pin or external control for forced continuous conduction mode (FCCM); output ripple increases below ~200mA due to variable-frequency discontinuous conduction.
MP2354DS-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MP2354DS-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2354DS-LF 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 reliable?
The price and inventory of MP2354DS-LF 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 is usually 5 days.
3.What payment methods are accepted for MP2354DS-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2354DS-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2354DS-LF?
MP2354DS-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2354DS-LF 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?
For technical support, including MP2354DS-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2354DS-LF requirements.
6.How does Aetrix verify that MP2354DS-LF is sourced from the original manufacturer or authorized distributors?
All MP2354DS-LF 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 meets industry standards.
7.What is the process for return or replacement of MP2354DS-LF?
All MP2354DS-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2354DS-LF, 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 part is unused and in its original packaging.
Return procedure for MP2354DS-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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