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Monolithic Power Systems Inc. MP2357DT-LF-Z
- Part No.:
- MP2357DT-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MP2357DT-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 500MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:23,495
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Product details
Overview
MP2357DT-LF-Z from Monolithic Power Systems is a current-mode synchronous step-down DC/DC converter with integrated 0.35Ω high-side MOSFET, delivering up to 0.5A output current across 4.5V–24V input range, fixed 1.4MHz switching frequency, and adjustable 0.81V–15V output voltage-used in battery-powered industrial sensors and point-of-load regulation.
For engineers reviewing the MP2357DT-LF-Z datasheet, MP2357DT-LF-Z pinout, MP2357DT-LF-Z application, or MP2357DT-LF-Z equivalent, this page provides verified package mapping (SOT23-6), confirmed thermal shutdown (150°C), cycle-by-cycle overcurrent protection, feedback voltage tolerance (±2.5%), and bootstrap capacitor interface requirements for stable buck operation.
Technical Context
The MP2357DT-LF-Z implements peak-current-mode control with internal slope compensation, enabling fast transient response and simplified loop stability using only external R-C feedback network. Its error amplifier compares 0.81V reference against FB voltage to modulate duty cycle via PWM comparator.
It integrates a high-side N-channel MOSFET with 0.35Ω RDS(ON), requires external Schottky diode for low-side conduction, and uses bootstrap capacitor between SW and BST pins to drive the gate above VIN-enabling operation at duty cycles up to 87%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports 12V/24V industrial rails and wide-range battery inputs without pre-regulation. |
| Output Voltage Range | 0.81V to 15V - set by external resistor divider; enables direct generation of 3.3V, 5V, or 12V logic/system rails. |
| Switching Frequency | Fixed 1.4MHz - allows compact external components (e.g., 4.7µH inductor, 22µF ceramic output cap) and reduces audible noise. |
| Peak Output Current | 0.5A - sufficient for powering microcontrollers, sensors, and small peripherals in space-constrained designs. |
| Feedback Voltage | 0.810V ±2.5% - defines output accuracy; sets minimum load regulation error under varying line/load conditions. |
| Shutdown Current | 0.1µA - enables ultra-low-power standby in battery-critical applications like remote IoT nodes. |
| Thermal Shutdown Threshold | 150°C - protects die during overload or poor PCB thermal design; auto-recovery after cooldown. |
Pinout & Package
MP2357DT-LF-Z is housed in a RoHS-compliant SOT23-6 package (JEDEC MO-193 AB), with exposed pad omitted per standard SOT23-6 construction-thermal performance relies on PCB copper area under pins 2 (GND) and 5 (IN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap supply node | Connects external 0.1–1µF capacitor to SW; enables high-side MOSFET gate drive above VIN for full-duty-cycle operation. |
| 2 GND | Power and signal ground reference | Primary return path for switch current and feedback reference; must be routed outside high-di/dt loops to avoid noise coupling into FB. |
| 3 FB | Resistor-divider feedback input | Senses output voltage; internal 0.81V reference sets regulation point; low 10nA bias enables high-resistor-divider use for low quiescent current. |
| 4 EN | Enable control input | Active-high logic interface: >1.2V enables regulator; <0.4V disables with 0.1µA shutdown current. |
| 5 IN | Main power input | Accepts 4.5–24V unregulated supply; requires local 4.7µF ceramic decoupling to suppress switching transients. |
| 6 SW | Switch node output | Drives external Schottky diode anode and inductor; high dv/dt node requiring short, low-inductance layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.35Ω High-Side MOSFET | Reduces BOM count and conduction loss-enables >92% efficiency at 500mA/12V→3.3V without external FET drivers. |
| Current-Mode Control with Slope Compensation | Ensures stable operation across all duty cycles and input voltages; eliminates need for external compensation components. |
| Cycle-by-Cycle Overcurrent Protection | Clamps peak inductor current at 0.8A-prevents MOSFET failure during short-circuit or startup surge without latch-off. |
| Stable with Low-ESR Ceramic Capacitors | Eliminates need for tantalum or electrolytic output caps-reduces size, improves reliability, and avoids aging-related capacitance drift. |
| 1.4MHz Fixed Switching Frequency | Enables use of small 4.7µH inductors and 22µF X5R/X7R ceramics-ideal for compact PCB layouts in portable and embedded systems. |
Applications
| Industrial Sensor Node Power | USB-Powered Peripheral Regulation |
|---|---|
Use Scenario: Powering 3.3V MCU, analog sensor, and BLE radio from a 12V field bus or Li-ion pack. IC Role / Device Role / Timing Role: Primary step-down regulator providing clean, regulated 3.3V rail with fast load transient response. Use Value: 0.5A capability supports burst-mode radio transmission; 0.1µA shutdown extends battery life in sleep intervals. |
Use Scenario: Converting 5V USB input to 1.8V core voltage for FPGA or ASIC in portable test equipment. IC Role / Device Role / Timing Role: Adjustable buck converter configured via precision resistor divider for accurate low-voltage rail generation. Use Value: 0.81V feedback reference enables tight 1.8V output tolerance (±2.5%); 1.4MHz operation minimizes inductor footprint. |
| Pre-Regulator for Linear Regulators | Distributed 24V-to-5V Conversion |
Use Scenario: Reducing 24V industrial supply to 6V before LDO for noise-sensitive analog circuitry. IC Role / Device Role / Timing Role: Efficient intermediate-stage buck converter lowering thermal load on downstream linear regulator. Use Value: 92% efficiency at 500mA cuts dissipation by >1W vs. direct 24V→5V LDO; wide 4.5–24V input accommodates brownout margins. |
Use Scenario: Local 5V rail generation on distributed I/O modules powered from centralized 24V backplane. IC Role / Device Role / Timing Role: Compact, self-contained buck solution minimizing board area and component count per module. Use Value: TSOT23-6/SOT23-6 footprint fits dense PCB layouts; cycle-by-cycle OCP ensures robustness against cable fault-induced shorts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2331H | Higher 1A output current, 2.2MHz switching frequency, improved light-load efficiency (PFM mode), same SOT23-6 pinout. | Supports higher-power loads and tighter ripple specs; better suited for new designs requiring scalability beyond 0.5A. | Select MP2331H when upgrading from MP2357DT-LF-Z for increased current headroom or reduced inductor size. |
| LM2675-5.0 | Fixed 5V output, 52kHz frequency, 1A rating, SO-8 package, no BST pin-requires external diode and larger magnetics. | Limited to fixed 5V output; lower frequency increases inductor/capacitor size; less suitable for space-constrained or adjustable-VOUT designs. | Choose LM2675-5.0 only if fixed 5V output and legacy SO-8 footprint compatibility are mandatory. |
Compared with MP2357DT-LF-Z, MP2331H offers higher current and frequency in identical packaging for future-proofing, while LM2675-5.0 trades adjustability and miniaturization for simplicity and fixed-output reliability in non-space-critical applications.
Availability
MP2357DT-LF-Z is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-powered peripherals, and distributed 24V-to-5V conversion requiring stable component supply and long-term production continuity.
Supply support for MP2357DT-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 MP2357 belongs to MPS's high-efficiency, integrated power converter product line-designed specifically for compact, cost-sensitive DC/DC applications in industrial, computing, and consumer electronics where minimal external components and thermal robustness are critical.
FAQ
What is the maximum recommended output current for MP2357DT-LF-Z?
The MP2357DT-LF-Z delivers up to 0.5A continuous output current under typical conditions (TA = +25°C, adequate PCB copper). At higher ambient temperatures or with poor thermal layout, derating applies-e.g., ~0.35A at +85°C ambient due to thermal shutdown activation at 150°C junction temperature.
Does MP2357DT-LF-Z require an external Schottky diode?
Yes. The MP2357DT-LF-Z integrates only a high-side MOSFET; a discrete Schottky diode (e.g., SS14 or equivalent) must be placed between SW and GND to provide the low-side conduction path during the off-time-no synchronous rectification is implemented internally.
Can MP2357DT-LF-Z operate with a 3.3V input?
No. The absolute minimum input voltage is 4.5V per the Recommended Operating Conditions table. Below 4.5V, UVLO prevents startup-even if VIN momentarily exceeds 4.5V, sustained operation below this threshold is not guaranteed and may cause erratic regulation or shutdown.
What is the purpose of the BST pin, and how is it connected?
The BST pin supplies the gate drive voltage for the internal high-side MOSFET. It must be connected via a 0.1–1µF ceramic capacitor to the SW pin-forming a floating charge pump that lifts the gate voltage above VIN, enabling full enhancement of the N-channel switch across all duty cycles.
Is MP2357DT-LF-Z pin-compatible with MP2357DJ-LF-Z?
Yes-both share identical pin functions and electrical specifications. The only difference is package: MP2357DT-LF-Z uses SOT23-6, while MP2357DJ-LF-Z uses TSOT23-6. Layouts differ slightly due to footprint dimensions and thermal pad presence, but schematic design and component placement are functionally interchangeable.
How does the frequency foldback feature work during overload?
When FB voltage drops below 250mV (indicating severe overload or short circuit), the internal frequency foldback comparator reduces switching frequency from 1.4MHz to ~460kHz. This lowers average switch current and thermal stress while maintaining regulation attempt-distinct from hard current limiting or latch-off shutdown.
What is the minimum recommended output capacitor value and type?
A 22µF X5R or X7R ceramic capacitor is recommended for stable operation and low output ripple. Lower values (e.g., 10µF) may compromise loop stability and increase ripple; aluminum or tantalum capacitors are not recommended due to higher ESR and potential instability with the current-mode controller.
MP2357DT-LF-Z 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-Z FAQ
1.How can I place an order for MP2357DT-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2357DT-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 MP2357DT-LF-Z reliable?
The price and inventory of MP2357DT-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 MP2357DT-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2357DT-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2357DT-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2357DT-LF-Z?
MP2357DT-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2357DT-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 MP2357DT-LF-Z?
For technical support, including MP2357DT-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2357DT-LF-Z requirements.
6.How does Aetrix verify that MP2357DT-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2357DT-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 MP2357DT-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2357DT-LF-Z?
All MP2357DT-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2357DT-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 MP2357DT-LF-Z part is unused and in its original packaging.
Return procedure for MP2357DT-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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