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Monolithic Power Systems Inc. MP2357DT-LF-P
- Part No.:
- MP2357DT-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MP2357DT-LF-P.pdf
- Description:
- IC REG BUCK ADJ 500MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:937
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Product details
Overview
MP2357DT-LF-P from Monolithic Power Systems is a current-mode synchronous step-down DC/DC converter with integrated 0.35Ω high-side MOSFET, delivering 0.5A peak output current across 4.5V–24V input range and adjustable 0.81V–15V output. It operates at fixed 1.4MHz switching frequency, supports ceramic output capacitors, and includes cycle-by-cycle over-current protection and thermal shutdown-used in battery chargers and pre-regulators for linear regulators.
For engineers reviewing the MP2357DT-LF-P datasheet, MP2357DT-LF-P pinout, MP2357DT-LF-P application, or MP2357DT-LF-P equivalent, key selection considerations include its TSOT23-6 package footprint, 0.81V feedback reference voltage, 100ns minimum on-time, 2.5–3.1V UVLO threshold, and bootstrap capacitor requirement for gate drive.
Technical Context
The MP2357DT-LF-P implements peak current-mode control with internal slope compensation, enabling stable operation with low-ESR ceramic output capacitors and fast transient response. Its error amplifier compares FB voltage against a 0.81V bandgap reference, while the PWM comparator integrates sensed inductor current and ramp compensation to regulate duty cycle.
It features a bootstrap gate-drive circuit requiring an external BST capacitor between SW and BST pins, supports 87% maximum duty cycle, and enters foldback mode (460kHz) when FB falls below 250mV-critical for short-circuit protection. Thermal shutdown activates at 150°C with automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide industrial and automotive supply rails without pre-regulation |
| Output Voltage Range | 0.81V to 15V - set via external resistor divider; 0.81V reference enables precise low-voltage regulation |
| Switching Frequency | Fixed 1.4MHz - enables compact LC filter design with sub-5µH inductors and <22µF ceramic output caps |
| Peak Output Current | 0.5A - limited by internal current sense and thermal design; derates above 35% duty cycle |
| RDS(ON) | 0.35Ω - reduces conduction loss at 0.5A, enabling >92% efficiency at mid-load with proper layout |
| Shutdown Current | 0.1µA - ensures ultra-low system standby power in battery-powered applications |
| Feedback Voltage | 0.810V (typ) - tight 20mV tolerance enables accurate output setting with standard 1% resistors |
Pinout & Package
MP2357DT-LF-P is housed in a TSOT23-6 package (0.95mm pitch, 2.9mm × 1.6mm footprint), with exposed pad for thermal enhancement. Pin 1 is bottom-left when top marking is read left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap supply node | Connects external 0.1–1µF capacitor to SW; provides floating gate drive voltage ≥VIN for high-side MOSFET |
| GND (Pin 2) | Analog and power ground reference | Must be routed separately from high-current paths to avoid noise coupling into FB and EA circuits |
| FB (Pin 3) | Feedback input | Senses output via resistor divider; 0.81V reference sets regulation point; triggers foldback if <250mV |
| EN (Pin 4) | Enable control input | Active-high logic: device enabled when >1.2V; draws only 2.1µA at 2V; supports sequencing and standby modes |
| IN (Pin 5) | Main power input | Accepts 4.5–24V unregulated supply; requires local 4.7µF ceramic decoupling close to pin |
| SW (Pin 6) | Switch node | Drives external Schottky diode (or synchronous rectifier in alternate designs); high dv/dt node requiring tight layout |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.35Ω MOSFET | Eliminates need for external high-side switch, reducing BOM count and PCB area in space-constrained designs |
| Stable with ceramic output caps | Enables use of small, reliable X5R/X7R MLCCs instead of bulkier electrolytics-improving lifetime and ESR stability |
| 1.4MHz fixed-frequency operation | Permits use of 4.7µH inductors and 22µF output capacitance, cutting solution size by >40% vs. 500kHz converters |
| Cycle-by-cycle current limiting | Provides immediate over-current protection per switching cycle-prevents MOSFET failure during output shorts |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and auto-restarts after cooldown-ensures robustness under sustained overload |
Applications
| Battery Charger | Distributed Power System |
|---|---|
|
Use Scenario: Charging Li-ion or NiMH cells from 9–24V wall adapters or vehicle systems. IC Role / Device Role / Timing Role: Primary buck regulator stepping down unregulated input to precise constant-voltage charge level (e.g., 4.2V). Use Value: 0.81V feedback reference and tight 20mV tolerance enable ±1% output accuracy critical for cell safety and longevity. |
Use Scenario: Local point-of-load conversion in telecom or industrial backplanes with 12V or 24V intermediate bus. IC Role / Device Role / Timing Role: Secondary DC/DC stage delivering 3.3V or 5V to FPGAs, microcontrollers, or sensors. Use Value: 1.4MHz switching allows compact 4.7µH inductors and 22µF ceramic caps-reducing board area by >35% vs. lower-frequency alternatives. |
| Pre-Regulator for Linear Regulators | Industrial Sensor Node Power Supply |
|
Use Scenario: Reducing 24V field bus voltage to ~5V before LDOs powering analog front-ends or precision ADCs. IC Role / Device Role / Timing Role: Efficient pre-regulator minimizing heat dissipation in linear post-regulators. Use Value: 92% peak efficiency at 0.5A load cuts thermal load on downstream LDOs, enabling smaller heatsinks or no heatsink. |
Use Scenario: Powering low-power wireless sensor nodes (e.g., LoRaWAN, NB-IoT) from 12V or 24V industrial sources. IC Role / Device Role / Timing Role: Main power converter operating in burst mode at light loads with 0.1µA shutdown current. Use Value: Ultra-low 0.1µA shutdown current extends battery life in intermittently active monitoring systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2331H | Higher 1A output current, 2.2MHz switching, improved light-load efficiency, same 0.81V FB reference | Supports higher-power loads and tighter ripple specs; requires smaller inductors (2.2µH typical) | Select MP2331H for new designs needing >0.5A or higher switching frequency; MP2357DT-LF-P remains viable for legacy cost-sensitive 0.5A applications |
| TPS560200 | 0.6A output, 1.7MHz, 0.6V FB reference, integrated soft-start, different pinout (SOT23-6) | Requires redesign of feedback network; lacks BST pin-uses internal charge pump instead | Choose TPS560200 only if 0.6V FB simplifies existing divider design or soft-start is mandatory; not pin-compatible |
Compared with MP2331H and TPS560200, MP2357DT-LF-P offers proven reliability in cost-sensitive 0.5A applications but lacks modern features like soft-start and higher frequency-making it suitable for mature designs where footprint and BOM stability are prioritized over feature expansion.
Availability
MP2357DT-LF-P is available at Aetrix Electronics and suitable for battery chargers, distributed power systems, and pre-regulators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2357DT-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 MP2357 belongs to MPS's mainstream buck converter product line, designed for cost-effective, space-constrained DC/DC conversion in industrial, consumer, and telecom equipment where 0.5A output and 24V input capability are essential.
FAQ
What is the recommended input capacitor for MP2357DT-LF-P?
A 4.7µF X5R or X7R ceramic capacitor placed as close as possible to the IN and GND pins is recommended. This value suppresses high-frequency switching noise and limits input surge current. Larger values (e.g., 10µF) may improve hold-up time but are not required for basic stability.
Can MP2357DT-LF-P operate without an external bootstrap diode?
Yes-it operates without an external bootstrap diode under most conditions. An external diode (e.g., 1N4148) from VOUT to BST is only recommended when VOUT ≥ 5V and duty cycle exceeds 65%, to improve gate drive margin and efficiency.
What is the minimum output voltage achievable with MP2357DT-LF-P?
The minimum regulated output voltage is 0.81V, set by the internal bandgap reference. The FB pin must be held at exactly this voltage via resistor divider; outputs below 0.81V cannot be regulated using standard feedback configuration.
How does the MP2357DT-LF-P respond during output short-circuit?
Under short-circuit, FB drops below 250mV, triggering oscillator foldback to 460kHz. Combined with cycle-by-cycle current limiting (0.8A typ), this reduces average power dissipation and prevents thermal runaway-allowing safe hiccup-mode recovery.
Is MP2357DT-LF-P pin-compatible with MP2357DJ?
Yes-both MP2357DT (SOT23-6) and MP2357DJ (TSOT23-6) share identical pinout and electrical specifications. However, their packages differ in footprint and thermal resistance (θJA = 220°C/W for both, but TSOT23-6 has better θJC), so layout and thermal design must match the selected variant.
What is the purpose of the BST pin and how is it configured?
The BST pin supplies gate drive voltage to the internal high-side MOSFET. It must be connected via a 0.1–1µF ceramic capacitor to the SW pin. This forms a flying capacitor that lifts the gate voltage above VIN, enabling full enhancement of the N-channel MOSFET switch.
Why is MP2357 marked "Not Recommended for New Designs"?
MPS recommends MP2331H as a drop-in upgrade offering higher 1A output, 2.2MHz operation, and improved light-load efficiency. MP2357DT-LF-P remains fully qualified and supported for existing designs, with no announced obsolescence date.
MP2357DT-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- 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):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.81V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 500mA
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MP2357DT-LF-P FAQ
1.How can I place an order for MP2357DT-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2357DT-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 MP2357DT-LF-P reliable?
The price and inventory of MP2357DT-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 MP2357DT-LF-P is usually 5 days.
3.What payment methods are accepted for MP2357DT-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2357DT-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2357DT-LF-P?
MP2357DT-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2357DT-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 MP2357DT-LF-P?
For technical support, including MP2357DT-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2357DT-LF-P requirements.
6.How does Aetrix verify that MP2357DT-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2357DT-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 MP2357DT-LF-P meets industry standards.
7.What is the process for return or replacement of MP2357DT-LF-P?
All MP2357DT-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2357DT-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 MP2357DT-LF-P part is unused and in its original packaging.
Return procedure for MP2357DT-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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