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Monolithic Power Systems Inc. MP2358DS-LF-P
- Part No.:
- MP2358DS-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2358DS-LF-P.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,942
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Product details
Overview
MP2358DS-LF-P from Monolithic Power Systems is a fixed-frequency, current-mode synchronous step-down DC/DC converter with integrated 0.18Ω high-side MOSFET and 10Ω low-side switch, delivering 2A continuous output current across 4.75V–23V input range, adjustable output from 0.92V to 16V, and 370kHz switching frequency-used in battery chargers and pre-regulators for linear regulators.
For engineers reviewing the MP2358DS-LF-P datasheet, MP2358DS-LF-P pinout, MP2358DS-LF-P application, or MP2358DS-LF-P equivalent, key selection criteria include its SOIC8 package thermal resistance (105°C/W), 23μA shutdown current, cycle-by-cycle overcurrent protection, and programmable UVLO threshold (2.50V typ) for robust power sequencing in industrial and portable systems.
Technical Context
The MP2358DS-LF-P implements peak current-mode control with internal slope compensation, enabling fast transient response and stable loop behavior with minimal external compensation components. Its functional block includes a transconductance error amplifier (GEA = 830 μA/V typ), 370kHz oscillator, and frequency foldback during short-circuit (240kHz) to limit power dissipation.
It integrates dual MOSFETs in a synchronous buck topology: the 0.18Ω high-side switch supports high efficiency at 2A load, while the 10Ω low-side switch enables bootstrap capacitor charging under light-load conditions. The COMP pin serves as both error amplifier output and current comparator input, directly interfacing with external RC compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous-supports compact power rails for embedded systems without external current boosting. |
| Input Voltage Range | 4.75V to 23V-enables direct operation from 5V, 12V, or 19V supplies, including automotive and industrial bus inputs. |
| Switching Frequency | Fixed 370kHz-balances EMI performance and inductor size; allows use of standard 2.2µH–4.7µH shielded inductors. |
| Feedback Reference | 0.92V ±2.8%-sets output voltage via resistor divider; enables precise 3.3V, 5V, or custom rail generation. |
| Shutdown Current | 23μA-minimizes standby power in battery-backed applications such as portable instrumentation. |
| Thermal Shutdown | 160°C-protects against sustained overload or poor PCB heatsinking in enclosed enclosures. |
| UVLO Threshold | 2.50V (rising), 210mV hysteresis-ensures clean startup and brownout recovery in noisy supply environments. |
Pinout & Package
MP2358DS-LF-P is housed in an SOIC8 package (4.9mm × 6.0mm × 1.75mm), rated for –40°C to +85°C operation, with exposed pad omitted (non-thermal enhanced variant). Thermal resistance θJA = 105°C/W enables 1.3W dissipation at 40°C ambient without forced airflow.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BS) | Bootstrap Supply | Connects to SW node via 10nF ceramic capacitor to generate floating gate drive voltage for high-side MOSFET. |
| 2 (IN) | Power Input | Accepts 4.75V–23V unregulated input; requires local 10µF ceramic + 0.1µF high-frequency bypass capacitor. |
| 3 (SW) | Switch Node | Drives external inductor; carries high di/dt switching current-requires tight layout to minimize EMI and ringing. |
| 4 (GND) | Analog/Digital Ground | Reference for FB, COMP, EN, SS; must be connected to low-impedance ground plane, isolated from power return paths. |
| 5 (FB) | Voltage Feedback | Senses output via resistor divider; 0.92V reference enables accurate regulation even with ±2% resistor tolerance. |
| 6 (COMP) | Error Amplifier Output | Interface for Type II compensation network (R-C series to GND); sets loop bandwidth and phase margin. |
| 7 (EN) | Enable / UVLO Input | Active-high logic control; internal 1.0μA pull-up enables simple resistor-divider UVLO configuration. |
| 8 (SS) | Soft-Start Timing | Connects to external capacitor (e.g., 1nF) to linearly ramp output voltage and limit inrush current at startup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 0.18Ω high-side + 10Ω low-side MOSFETs eliminate external switches and reduce BOM count by 4 components. |
| Ceramic-Capacitor Stable | Operates with low-ESR ceramic output capacitors (≥10µF) without requiring tantalum or electrolytic alternatives. |
| Programmable UVLO | Configurable input undervoltage lockout using external resistor divider on EN pin-no additional IC needed. |
| Current-Limit Protection | 3.4A cycle-by-cycle current limit prevents damage during output short or overload-no external sensing required. |
| Efficiency Optimization | 93% peak efficiency at 3.3V/2A (12V input) enables thermally constrained designs without heatsinks or fans. |
Applications
| Battery Charger | Distributed Power System |
|---|---|
|
Use Scenario: Charging single-cell Li-ion or multi-cell NiMH batteries from 12V or 19V adapters. IC Role / Device Role / Timing Role: Primary step-down regulator providing constant-current/constant-voltage (CC/CV) compliant output with soft-start and thermal foldback. Use Value: 23μA shutdown current extends standby time; programmable UVLO prevents charging below safe battery voltage thresholds. |
Use Scenario: Local point-of-load (POL) conversion in telecom or server backplanes with 12V or 48V intermediate bus. IC Role / Device Role / Timing Role: Synchronous buck converter generating 3.3V or 5V rails for FPGAs, ASICs, or interface ICs with fast load transient response. Use Value: 370kHz fixed frequency simplifies EMI filter design; current-mode control ensures stability across wide output capacitance ranges (10–100µF). |
| Pre-Regulator for Linear Regulators | Industrial Sensor Power Supply |
|
Use Scenario: Reducing 24V industrial supply to 5V before LDOs powering analog front-ends or precision DACs. IC Role / Device Role / Timing Role: Efficient pre-regulator minimizing heat dissipation in linear post-regulation stages. Use Value: 0.92V feedback reference enables tight output tolerance (±1%) after LDO; 93% efficiency reduces thermal load on downstream components. |
Use Scenario: Powering 4–20mA loop-powered sensors or MEMS-based condition monitoring nodes from 12–24V field wiring. IC Role / Device Role / Timing Role: Compact, rugged DC/DC stage delivering regulated 3.3V with fault protection and low quiescent current. Use Value: Thermal shutdown and cycle-by-cycle current limiting ensure reliability in unattended remote deployments; SOIC8 package supports automated optical inspection (AOI). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2357DS-LF-Z | Same SOIC8 package, but 1.5A output rating and 500kHz switching frequency; lower RDS(ON) (0.15Ω) but reduced current capability. | Optimized for lower-power loads (<1.5A); higher fS enables smaller inductors but increases switching losses at high VIN. | Select when board space is critical and load current stays ≤1.5A-reduces inductor footprint by ~30%. |
| TPS54202DRCT | TI part in 10-pin WSON; 2A rating, 400–2.5MHz adjustable frequency, 1.5V–6V VIN min; lacks bootstrap diode support and has higher 26μA shutdown current. | Requires external bootstrap diode for >65% duty cycle; narrower input range excludes 23V operation; no integrated low-side switch. | Choose only if programmable frequency and integrated MOSFET driver are prioritized over input voltage range and simplicity. |
Compared with MP2358DS-LF-P, MP2357DS-LF-Z trades output current for higher switching frequency and lower conduction loss, while TPS54202DRCT offers frequency flexibility at the cost of reduced input range and added external component requirements.
Availability
MP2358DS-LF-P is available at Aetrix Electronics and suitable for battery charger designs, distributed power systems, and industrial sensor power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2358DS-LF-P 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 MP2358 belongs to MPS's high-efficiency, integrated DC/DC converter product line-designed specifically for space-constrained, thermally sensitive applications requiring minimal external components and robust fault protection.
FAQ
What is the maximum recommended output voltage for MP2358DS-LF-P?
The MP2358DS-LF-P supports output voltages up to 16V, set by the FB resistor divider. This limit arises from the internal 0.92V reference and absolute maximum ratings of the COMP and FB pins (≤6V). Exceeding 16V risks violating the FB pin voltage specification under load transients or temperature drift.
Can MP2358DS-LF-P operate without an external Schottky diode?
Yes-MP2358DS-LF-P integrates both high-side and low-side MOSFETs in a synchronous buck architecture, eliminating the need for an external rectifier diode. The 10Ω low-side switch handles freewheeling current, improving efficiency by ~5–8% compared to asynchronous designs.
How does the soft-start function interact with the enable pin?
Soft-start begins only after the EN pin voltage exceeds 2.62V (UVLO rising threshold). The SS pin capacitor charges linearly from GND, ramping the COMP pin reference and thus controlling output voltage rise time. If EN is toggled low during startup, soft-start resets and restarts upon next enable.
What is the minimum inductor value recommended for 3.3V/2A operation at 12V input?
For 3.3V/2A output with 12V input, the datasheet recommends inductor ripple current ≈30% of switch current limit (3.4A), yielding ~1.02A p-p. Using the formula L = (VIN − VOUT) × VOUT / (VIN × fS × ΔIL), minimum inductance is 2.2µH. A 2.2µH or 3.3µH shielded power inductor is typical.
Does MP2358DS-LF-P support forced PWM mode or only PFM at light load?
MP2358DS-LF-P operates exclusively in forced PWM mode-its 370kHz oscillator runs continuously regardless of load. Unlike PFM-capable converters, it maintains constant frequency and predictable EMI signature, but does not reduce switching losses at light loads.
Is the exposed pad on MP2358DS-LF-P electrically connected or thermal-only?
The SOIC8 package used in MP2358DS-LF-P does not feature an exposed thermal pad-unlike the QFN10 variant (MP2358DQ). All eight pins are standard gull-wing leads; thermal management relies solely on PCB copper area connected to Pin 4 (GND) and proper trace width.
What failure modes trigger automatic shutdown beyond thermal events?
In addition to thermal shutdown at 160°C, MP2358DS-LF-P disables switching during cycle-by-cycle overcurrent events (detected when sensed current exceeds 3.4A) and enters low-IQ shutdown when EN falls below 0.7V. No latch-off occurs-operation resumes automatically once fault conditions clear.
MP2358DS-LF-P 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:
- Not For New Designs
- 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):
- 0.92V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 2A
- Frequency - Switching:
- 370kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP2358DS-LF-P FAQ
1.How can I place an order for MP2358DS-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2358DS-LF-P 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 MP2358DS-LF-P reliable?
The price and inventory of MP2358DS-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2358DS-LF-P is usually 5 days.
3.What payment methods are accepted for MP2358DS-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2358DS-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2358DS-LF-P?
MP2358DS-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2358DS-LF-P 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 MP2358DS-LF-P?
For technical support, including MP2358DS-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2358DS-LF-P requirements.
6.How does Aetrix verify that MP2358DS-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2358DS-LF-P 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 MP2358DS-LF-P meets industry standards.
7.What is the process for return or replacement of MP2358DS-LF-P?
All MP2358DS-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2358DS-LF-P, 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 MP2358DS-LF-P part is unused and in its original packaging.
Return procedure for MP2358DS-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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