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Monolithic Power Systems Inc. MP2358DS-LF-Z
- Part No.:
- MP2358DS-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2358DS-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,062
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Product details
Overview
MP2358DS-LF-Z 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 over 4.75V–23V input range. It features 370kHz switching frequency, 0.92V feedback reference, programmable soft-start, cycle-by-cycle over-current protection, and thermal shutdown - deployed in battery chargers and distributed power systems requiring compact, efficient regulation.
For engineers reviewing the MP2358DS-LF-Z datasheet, MP2358DS-LF-Z pinout, MP2358DS-LF-Z application, or MP2358DS-LF-Z equivalent, key selection criteria include its SOIC8 package compatibility, 23μA shutdown quiescent current, 93% peak efficiency at 3.3V/2A, and UVLO threshold of 2.50V with 210mV hysteresis - all critical for industrial power rail design and BOM consolidation.
Technical Context
The MP2358DS-LF-Z implements current-mode control with transconductance error amplifier (GEA = 550–1150 μA/V) and slope-compensated current sensing to ensure stability across wide duty cycles. Its internal 370kHz oscillator sets switching timing, while frequency foldback activates below 400mV FB voltage to limit short-circuit current.
It integrates dual MOSFETs in a non-synchronous buck topology: the 0.18Ω high-side switch handles power delivery, while the 10Ω low-side switch enables bootstrap capacitor charging during light-load conditions. The COMP pin serves as both error amplifier output and current comparator input, enabling direct loop compensation via external RC networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports mid-power rails like FPGA core supplies or motor driver pre-regulators without external heatsinking. |
| Input Voltage Range | 4.75V to 23V - accommodates 5V, 12V, and 24V industrial bus inputs with margin for transients. |
| Switching Frequency | Fixed 370kHz - enables use of small, standard inductors (e.g., 2.2–4.7μH) while avoiding AM radio band interference. |
| Feedback Reference | 0.92V ±2.9% - allows precise output setting from 0.92V to 16V using standard resistor dividers; reduces divider current error. |
| Shutdown Current | 23μA - minimizes system standby power in battery-backed or energy-sensitive applications. |
| UVLO Threshold | Rising edge: 2.50V ±130mV - ensures reliable startup after brownout recovery; hysteresis prevents chatter near threshold. |
| Thermal Shutdown | 160°C - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
MP2358DS-LF-Z uses an SOIC8 (Small Outline Integrated Circuit, 8-pin) package with exposed pad omitted (unlike QFN10 variant), rated for –40°C to +85°C operation. Thermal resistance θJA = 105°C/W enables moderate power dissipation with standard 1 oz copper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BS | Bootstrap Supply | Connects to SW node via 10nF capacitor to generate gate drive voltage > VIN for high-side MOSFET; requires no external diode in most configurations. |
| 2 IN | Power Input | Accepts 4.75–23V unregulated supply; must be decoupled with ≥10μF low-ESR ceramic capacitor placed adjacent to pin. |
| 3 SW | Switch Node | Drives external inductor; carries high di/dt switching current - routing must minimize loop area to reduce EMI and voltage spikes. |
| 4 GND | Power Ground | Primary return path for high-current switching; must connect directly to input/output capacitor ground planes, separate from analog ground. |
| 5 FB | Feedback Input | Senses output voltage via resistive divider; 0.92V reference sets regulation point; sensitive to noise - keep traces short and away from SW. |
| 6 COMP | Compensation Node | Output of transconductance error amplifier; connects to RC network for loop stability tuning - dominant pole/zero placement affects transient response. |
| 7 EN | Enable / UVLO Input | Active-high logic control; <0.7V disables regulator (23μA IQ); 2.50V threshold enables operation; internal 1μA pull-up simplifies interface. |
| 8 SS | Soft-Start | Connects to external capacitor to linearly ramp COMP voltage; controls inrush current and output overshoot during startup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switches | 0.18Ω high-side MOSFET + 10Ω low-side switch - eliminates external FETs and drivers, reducing board space and component count. |
| Ceramic-Capacitor Stable | Operates with low-ESR ceramic output capacitors - avoids bulkier tantalum/electrolytic parts and improves reliability in temperature-cycling environments. |
| Programmable Soft-Start | External capacitor on SS pin sets startup time - prevents input voltage sag and output overshoot in multi-rail systems with sequencing requirements. |
| Cycle-by-Cycle OCP | Current limit threshold of 2.8–3.4A - provides immediate fault response without latch, supporting hiccup-mode recovery in intermittent overload scenarios. |
| Efficiency Optimization | 93% peak efficiency at 3.3V/2A - achieved via low RDS(on) and optimized gate drive, reducing thermal load in enclosed enclosures. |
Applications
| Battery Charger Pre-Regulator | Distributed Power System Rail |
|---|---|
|
Use Scenario: Regulates 12V or 24V bus down to 5V/3.3V for Li-ion charger ICs in portable medical devices. IC Role / Device Role / Timing Role: Primary buck converter supplying constant-voltage input to dedicated charge management IC (e.g., BQ24xxx). Use Value: 23μA shutdown current extends battery shelf life; wide input range tolerates automotive battery fluctuations during engine cranking. |
Use Scenario: Generates isolated 3.3V/2A rail from 12V backplane in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Local point-of-load regulator replacing inefficient linear regulators in space-constrained DIN-rail mounted units. Use Value: 93% efficiency reduces heat buildup in sealed enclosures; SOIC8 package allows automated assembly and rework compatibility. |
| Motor Driver Logic Supply | FPGA Core Voltage Pre-Regulator |
|
Use Scenario: Powers gate drivers and logic circuitry for BLDC motor controllers in HVAC blowers. IC Role / Device Role / Timing Role: Mid-power supply stage between main 24V input and low-noise LDOs feeding MCU and driver ICs. Use Value: 370kHz fixed frequency enables predictable EMI filtering; thermal shutdown prevents damage during stall-current events. |
Use Scenario: Provides 1.2V/2A intermediate rail for Xilinx Spartan-7 FPGA core, preceding final low-noise LDO regulation. IC Role / Device Role / Timing Role: High-efficiency pre-regulator minimizing power loss before ultra-low-noise post-regulation. Use Value: Programmable soft-start prevents FPGA configuration failure due to VCCINT slew rate violations; FB accuracy ±2.9% ensures stable core voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2358DQ-LF-Z | Same die in QFN10 (3mm × 3mm) package with exposed thermal pad; θJA = 50°C/W vs. SOIC8's 105°C/W. | Better thermal performance in high-density layouts; requires reflow-compatible PCB design and tighter layout rules for SW/GND loops. | Select when board space is constrained and thermal headroom is limited; avoid if manual rework or wave soldering is required. |
| TI TPS54202DRCT | 4.5–28V input, 2A, 500kHz, integrated FETs; 12μA shutdown current; different compensation architecture (Type II vs. MP2358's Type III). | Higher switching frequency enables smaller magnetics but increases EMI filtering complexity; lower IQ benefits ultra-low-power standby modes. | Choose when 500kHz operation aligns with system EMI targets or when TI's WEBENCH support is preferred for rapid design validation. |
Compared with MP2358DS-LF-Z, the QFN10 variant offers superior thermal handling for sustained 2A loads, while the TPS54202DRCT trades higher frequency for lower quiescent current and distinct loop compensation - making each optimal for different layout priorities and system-level power budgets.
Availability
MP2358DS-LF-Z is available at Aetrix Electronics and suitable for battery chargers, distributed power systems, motor driver logic supplies, and FPGA pre-regulators requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2358DS-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 MP2358 belongs to MPS's mainstream DC/DC converter product line, designed specifically for cost-sensitive, space-constrained industrial and consumer power supplies requiring high integration and robust protection features.
FAQ
What is the minimum recommended input capacitance for MP2358DS-LF-Z?
The datasheet specifies ≥10μF low-ESR ceramic input capacitance placed adjacent to the IN and GND pins. This value suppresses high-frequency switching ripple and prevents voltage droop during transient load steps. For 24V input applications with >1A load steps, adding a parallel 47μF tantalum or polymer capacitor improves RMS current handling and reduces low-frequency ripple.
Can MP2358DS-LF-Z operate without an external Schottky diode?
Yes - the MP2358DS-LF-Z integrates a 10Ω low-side switch that replaces the external diode in standard buck topologies. However, an external Schottky diode (e.g., B220A) is still required across the inductor to conduct current when the high-side switch is off, as the internal low-side switch is not body-diode-replaced and lacks sufficient conduction capability for full-load operation.
How does the MP2358DS-LF-Z handle short-circuit conditions?
Under short-circuit, the FB voltage drops below 400mV, triggering frequency foldback - the oscillator slows from 370kHz to 240kHz. Simultaneously, cycle-by-cycle current limiting caps peak inductor current at 2.8–3.4A. This dual mechanism limits power dissipation and prevents thermal runaway while maintaining hiccup-like recovery behavior without latching.
Is the SS pin mandatory for functional operation?
No - the SS pin is optional. Leaving it open enables automatic startup with internal soft-start (~1ms). Connecting an external capacitor (e.g., 1nF–10nF) extends startup time linearly, which mitigates inrush current in systems with large output capacitance or strict voltage ramp requirements per IEC 61000-4-5 or MIL-STD-704.
What is the role of the BS pin, and can it be left floating?
The BS pin is the bootstrap supply for the high-side MOSFET gate driver and must never be left floating. It connects to the SW node through a 10nF ceramic capacitor. Without this capacitor, the high-side switch cannot turn on, causing regulator failure. An external bootstrap diode (e.g., IN4148) is optional only for high-duty-cycle applications (e.g., 5V out from 12V in) to improve efficiency.
Does MP2358DS-LF-Z support adjustable switching frequency?
No - the MP2358DS-LF-Z has a factory-trimmed fixed 370kHz oscillator. Frequency variation is ±10% over temperature and input voltage. For designs requiring frequency synchronization or adjustment, consider MPS's MP2338 (synchronizable) or TI's TPS54202 (adjustable via external resistor), as MP2358DS-LF-Z offers no pin or register-based frequency control.
How does thermal performance differ between MP2358DS-LF-Z and MP2358DQ-LF-Z?
MP2358DS-LF-Z in SOIC8 has θJA = 105°C/W, limiting continuous 2A operation to ambient ≤55°C with minimal copper; MP2358DQ-LF-Z in QFN10 achieves θJA = 50°C/W due to its exposed thermal pad, enabling full 2A output up to +85°C ambient with standard 2-layer PCB layout - a 55°C junction rise advantage under identical conditions.
MP2358DS-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:
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP2358DS-LF-Z FAQ
1.How can I place an order for MP2358DS-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2358DS-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 MP2358DS-LF-Z reliable?
The price and inventory of MP2358DS-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 MP2358DS-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2358DS-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2358DS-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2358DS-LF-Z?
MP2358DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2358DS-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 MP2358DS-LF-Z?
For technical support, including MP2358DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2358DS-LF-Z requirements.
6.How does Aetrix verify that MP2358DS-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2358DS-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 MP2358DS-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2358DS-LF-Z?
All MP2358DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2358DS-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 MP2358DS-LF-Z part is unused and in its original packaging.
Return procedure for MP2358DS-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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