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Monolithic Power Systems Inc. MP2378DS-LF
- Part No.:
- MP2378DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2378DS-LF.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,709
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Product details
Overview
MP2378DS-LF from Monolithic Power Systems is a monolithic 2A, 30V, 385kHz synchronous step-down DC/DC converter in SOIC-8 package with integrated 0.28Ω high-side MOSFET and 6Ω low-side switch, supporting adjustable output from 0.92V to 16V across 4.75–30V input, used in battery chargers and DSL modems for efficient pre-regulation.
For engineers reviewing the MP2378DS-LF datasheet, MP2378DS-LF pinout, MP2378DS-LF application, or MP2378DS-LF equivalent, this page delivers verified electrical parameters, validated SOIC-8 terminal mapping, confirmed soft-start programmability, thermal shutdown behavior, and real-world efficiency vs. load data at 3.3V/2A, 5V, and 2.5V outputs.
Technical Context
The MP2378DS-LF employs current-mode control with slope compensation to stabilize operation above 40% duty cycle, using an internal transconductance error amplifier (GEA = 650–1250 µA/V) and current sense transconductance (GCS = 1.95 A/V) to regulate output via FB pin voltage feedback referenced to 0.92V bandgap.
It integrates bootstrap gate drive circuitry (BS pin), fixed 385kHz oscillator (±13% tolerance), and dual protection: cycle-by-cycle over-current limiting (2.6–3.4A threshold) and thermal shutdown at 160°C, with UVLO hysteresis of 210mV and 23µA shutdown quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports stable power delivery to loads like DSL modem PHYs or battery charge management ICs without external current boosting. |
| Input Voltage Range | 4.75V to 30V - enables direct operation from 12V industrial rails or wide-range battery inputs (e.g., 4S Li-ion up to 16.8V fully charged). |
| Feedback Reference | 0.92V ±2.8% - sets precise output voltage via resistor divider; allows 3.3V output with 10kΩ R2 and 25.8kΩ R1. |
| Switching Frequency | 385kHz typical - balances EMI control and inductor size; supports compact 2.2µH–4.7µH magnetics with <30% ripple current. |
| Efficiency | 95% at 3.3V/2A - minimizes thermal load in space-constrained enclosures; achieved with 0.28Ω high-side and optimized gate drive. |
| Shutdown Current | 23µA - enables ultra-low-power system sleep modes; EN pin must be <0.7V for full disable. |
| Thermal Shutdown | 160°C - protects against sustained overload or poor PCB copper area; auto-recovery after cooldown. |
Pinout & Package
MP2378DS-LF is housed in a standard SOIC-8 package (5.0mm × 6.2mm, 1.27mm pitch) with exposed pad not electrically connected - thermal performance relies on PCB copper area under pins 4 (IN), 3 (SW), and 4 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BS) | Bootstrap Supply | Connects external 10nF capacitor between BS and SW to generate floating ~5V gate drive for high-side MOSFET during switching. |
| 2 (IN) | Main Input Supply | Accepts 4.75–30V unregulated input; requires local 10µF ceramic + 0.1µF bypass near pin to suppress switching noise. |
| 3 (SW) | Power Switch Node | Drives external inductor; connects to IN via high-side MOSFET or GND via low-side switch; carries full AC switching current. |
| 4 (GND) | Analog & Power Ground | Reference for FB, COMP, EN, SS; must be routed outside high-current D1–C1 return path to avoid noise coupling into regulation loop. |
| 5 (FB) | Feedback Input | Senses divided output voltage; internal 0.92V reference compares against divider ratio; frequency foldback activates if FB < 400mV (short-circuit protection). |
| 6 (COMP) | Error Amplifier Output | Transconductance amplifier output (650–1250 µA/V); connects external RC network to set pole-zero for loop stability and transient response. |
| 7 (EN) | Enable / UVLO Input | Active-high enable (threshold 0.7–1.3V); internal 1µA pull-up; UVLO rising threshold 2.50V ±130mV with 210mV hysteresis. |
| 8 (SS) | Soft-Start Control | Connects external capacitor to program startup ramp time; prevents inrush current and output overshoot; open = automatic start. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 0.28Ω high-side + 6Ω low-side MOSFETs eliminate external switches and reduce BOM count by ≥4 components. |
| Ceramic-Capacitor Stable | Compensated for low-ESR ceramic output caps (no tantalum/electrolytic required), enabling smaller, more reliable output filtering. |
| Programmable Soft-Start | External SS capacitor sets controlled output ramp rate - avoids input supply sag and downstream LDO overcurrent during power-up. |
| Current-Mode Control | Enables fast transient response (<10µs recovery) and simplifies loop compensation with single-pole-zero network at COMP pin. |
| Robust Protection Suite | Cycle-by-cycle current limit + thermal shutdown + UVLO ensures safe operation under overload, short-circuit, or brownout conditions. |
Applications
| Battery Charger Pre-Regulator | DSL Modem Power Supply |
|---|---|
Use Scenario: Supplies regulated 3.3V/2A to charging controller ICs (e.g., BQ24xxx) from variable 9–24V wall adapters or automotive inputs. IC Role / Device Role / Timing Role: Primary buck regulator providing stable intermediate rail; handles line/load transients during CC/CV mode transitions. Use Value: 95% efficiency reduces heat in sealed charger enclosures; programmable UVLO prevents operation below minimum battery pack voltage. |
Use Scenario: Powers ADSL/VDLS PHY and analog front-end circuits requiring clean 5V/2A from noisy 12V telecom distribution bus. IC Role / Device Role / Timing Role: Point-of-load converter with fast load-step response to handle bursty line driver activity. Use Value: Current-mode control delivers <10µs transient recovery; SOIC-8 footprint fits dense modem PCB layouts without thermal derating. |
| Distributed Power System Rail | Pre-Regulator for Linear Regulators |
Use Scenario: Generates 2.5V/2A intermediate rail for FPGA I/O banks or microcontroller peripherals in industrial control modules. IC Role / Device Role / Timing Role: High-efficiency buck stage preceding LDOs; supplies low-noise input to downstream regulators. Use Value: Fixed 385kHz switching enables predictable EMI filtering; 23µA shutdown current supports deep-sleep system states. |
Use Scenario: Steps down 12V/24V industrial supply to 3.3V before low-noise LDO (e.g., TPS7A47) for analog sensor signal chains. IC Role / Device Role / Timing Role: Efficient pre-regulator reducing LDO thermal dissipation and improving overall system efficiency. Use Value: Adjustable output (0.92–16V) allows optimization for LDO dropout; thermal shutdown prevents cascade failure if LDO overheats. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 1.5A output, 36V max input, 500kHz fSW, QFN-10 package - higher frequency but lower current rating and no SOIC-8 option. | Preferred for space-constrained designs needing >30V input; unsuitable for 2A continuous loads or legacy SOIC-8 board footprints. | Select when input exceeds 30V or PCB area is limited; verify thermal design for QFN-10 at full load. |
| LM2678SD-3.3/NOPB | 2A output, 40V max input, 260kHz fSW, SOIC-8 - lower switching frequency, no programmable soft-start, 50µA shutdown current. | Compatible pinout but lacks SS pin and has slower transient response; better for cost-sensitive non-battery apps with relaxed efficiency needs. | Choose only if 3.3V fixed output suffices and soft-start is unnecessary; expect larger inductors due to 260kHz operation. |
Compared with MP2378DS-LF, MP2315DJ-LF-Z trades current capability for higher input voltage and frequency, while LM2678SD-3.3/NOPB offers fixed-output simplicity at the cost of design flexibility and efficiency - MP2378DS-LF uniquely balances 2A SOIC-8 integration, programmable features, and 95% efficiency.
Availability
MP2378DS-LF is available at Aetrix Electronics and suitable for battery charger pre-regulators, DSL modem power supplies, and distributed power system rails requiring stable component supply with full RoHS compliance and lead-free finish.
Supply support for MP2378DS-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 power ICs, headquartered in Kirkland, WA, with global design and support centers.
The MP2378 belongs to MPS's high-efficiency DC/DC converter product line, engineered for industrial, telecom, and consumer applications demanding compact size, wide input range, and robust protection without external MOSFETs.
FAQ
What is the minimum input voltage for MP2378DS-LF to start regulation?
The MP2378DS-LF begins regulation when input voltage exceeds the UVLO rising threshold of 2.50V ±130mV. However, stable 2A operation requires VIN ≥4.75V per datasheet specifications - below this, output current capability degrades and may fall below 2A due to reduced duty cycle headroom and increased conduction losses.
Can MP2378DS-LF operate without an external bootstrap capacitor?
No - the BS pin requires a 10nF ceramic capacitor connected between BS and SW to sustain gate drive for the internal high-side MOSFET. Omitting it causes immediate loss of high-side switching, resulting in no output voltage or catastrophic failure under load due to shoot-through risk.
How does the frequency foldback function protect during short-circuit events?
When FB voltage drops below 400mV (indicating severe overload or short), the internal frequency foldback comparator reduces oscillator frequency from 385kHz to 270kHz. This lowers peak inductor current and average power dissipation, preventing thermal runaway while maintaining detectable switching for fault identification.
Is the SOIC-8 package thermally enhanced with an exposed pad?
No - the MP2378DS-LF SOIC-8 package has no electrically or thermally connected exposed pad. Thermal performance relies entirely on PCB copper area connected to pins 2 (IN), 3 (SW), and 4 (GND), with θJA = 105°C/W measured on 1"² of 1oz copper.
What is the maximum recommended output voltage adjustment range?
The MP2378DS-LF supports output voltages from 0.92V to 16V, set by FB divider ratio. At 16V output, ensure input voltage remains ≤30V and that external components (inductor saturation, diode reverse voltage, capacitor ratings) are rated for worst-case stress - especially critical for 16V/2A operation where power dissipation peaks.
Does MP2378DS-LF require an external Schottky diode in all configurations?
Yes - the MP2378DS-LF uses asynchronous topology with internal low-side switch but requires an external Schottky diode (e.g., B220A) from SW to GND to conduct inductor current when the high-side switch is off. Omitting it causes destructive voltage spikes and regulator failure.
How does the soft-start capacitor value affect startup behavior?
The SS pin capacitor sets soft-start duration: larger capacitance increases ramp time linearly. For example, 100nF yields ~5ms ramp; 1µF extends to ~50ms. This directly controls inrush current magnitude and prevents output overshoot - critical when powering sensitive downstream logic or analog circuits.
MP2378DS-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:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 0.92V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 2A
- Frequency - Switching:
- 385kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP2378DS-LF FAQ
1.How can I place an order for MP2378DS-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2378DS-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 MP2378DS-LF reliable?
The price and inventory of MP2378DS-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2378DS-LF is usually 5 days.
3.What payment methods are accepted for MP2378DS-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2378DS-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2378DS-LF?
MP2378DS-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2378DS-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 MP2378DS-LF?
For technical support, including MP2378DS-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2378DS-LF requirements.
6.How does Aetrix verify that MP2378DS-LF is sourced from the original manufacturer or authorized distributors?
All MP2378DS-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 MP2378DS-LF meets industry standards.
7.What is the process for return or replacement of MP2378DS-LF?
All MP2378DS-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2378DS-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 MP2378DS-LF part is unused and in its original packaging.
Return procedure for MP2378DS-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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