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Monolithic Power Systems Inc. MP2345GJ-P
- Part No.:
- MP2345GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP2345GJ-P.pdf
- Description:
- IC REG BUCK ADJ 2.5A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,882
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Product details
Overview
MP2345GJ-P from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 90mΩ/40mΩ high-side/low-side MOSFETs, delivering 2.5A continuous output current across a 7.5V–26V input range, fixed 600kHz switching frequency, and internal power-save mode for light loads - deployed in RF-enabled devices and flat-panel display standby supplies.
For engineers reviewing the MP2345GJ-P datasheet, MP2345GJ-P pinout, MP2345GJ-P application, or MP2345GJ-P equivalent, this page delivers verified technical context, validated pin functions, confirmed EMI-optimized operation, real-world efficiency curves at 3.3V/5V outputs, and precise thermal shutdown behavior at 150°C junction temperature.
Technical Context
The MP2345GJ-P operates in fixed-frequency peak-current-mode control with an internal 0.791V reference and cycle-by-cycle over-current protection triggering at 3.5–5.5A. Its AAM (Advanced Asynchronous Modulation) power-save mode activates when COMP voltage falls below 0.4V, enabling pulse-skipping PFM operation under light load.
Bootstrap charging uses an external capacitor between SW and BST to sustain the high-side gate driver; VCC is internally regulated from VIN and supports external 5V biasing via diode. UVLO has 6.3V rising threshold with 470mV hysteresis, and soft-start ramps output from 10% to 90% in 0.8–2.2ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 26V - supports wide industrial and automotive supply rails without pre-regulation |
| Output Current | 2.5A continuous - sufficient for powering SoC cores, FPGAs, or display logic rails |
| Switching Frequency | 600kHz fixed - enables compact 10μH inductor selection and predictable EMI filtering |
| Internal MOSFET RDS(on) | 90mΩ (HS) / 40mΩ (LS) - minimizes conduction loss and improves full-load efficiency up to 95% |
| Feedback Reference | 791mV ±16mV - sets precise output voltage via external resistor divider (e.g., 3.3V or 5V) |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during sustained overload or poor PCB thermal design |
| OCP Threshold | 3.5A to 5.5A - provides robust short-circuit protection with hiccup-mode recovery |
Pinout & Package
MP2345GJ-P is housed in a space-saving TSOT23-6 package (1.6mm × 2.9mm × 0.85mm), rated MSL 1, with exposed pad for thermal enhancement. Pin 1 is bottom-left when viewing top marking left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Primary input supply rail | Accepts 7.5V–26V; requires local 22μF low-ESR ceramic decoupling with wide PCB traces |
| 2 SW | Switch node | Drives external inductor; connects to BST capacitor and must be routed away from FB/ANALOG areas |
| 3 GND | Power and signal ground reference | Single-point star ground connection required; tie to thermal pad and input/output capacitors via multiple vias |
| 4 BST | Bootstrap supply for high-side driver | Requires 0.1μF ceramic capacitor between BST and SW; optional external diode from VOUT improves efficiency at 5V |
| 5 VCC | Internal LDO output & bias rail | Decoupled with 0.1–0.22μF capacitor; can be externally biased by 5V rail via diode to reduce quiescent current |
| 6 FB | Feedback input for output regulation | Monitors resistor divider; triggers foldback at 396mV during short-circuit; sensitive to noise - route short and shielded |
Key Features
| Feature | Design Value |
|---|---|
| Low-EMI Switching Edge | SW anti-ringing circuitry suppresses high-frequency radiation, easing EMC compliance in compact layouts |
| Internal Soft Start | 1.5ms typical ramp time prevents output overshoot and inrush current during power-up |
| Power-Save Mode (AAM) | Enables PFM operation below ~100mA load, reducing Iq to 170μA and improving light-load efficiency |
| Hiccup-Mode OCP | Enters periodic restart after over-current fault, limiting average short-circuit current and die temperature rise |
| Optimized Bootstrap Charging | Internal regulation maintains ~4V BST voltage across CBST, ensuring reliable high-side FET turn-on across input range |
Applications
| RF Power Amplifier Bias Supply | Flat-Panel Display Standby Rail |
|---|---|
|
Use Scenario: Provides stable 3.3V/2.5A bias to GaN or LDMOS RF power amplifiers in 5G base station remote radio units. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 12V/24V backplane to clean, low-noise PA supply with fast transient response. Use Value: 95% peak efficiency at 12VIN/5VOUT reduces thermal load; low EMI design avoids interference with adjacent RF front-end circuits. |
Use Scenario: Generates always-on 5V standby voltage for HDMI/USB-C controller and microcontroller in smart TV mainboards. IC Role / Device Role / Timing Role: Standby-mode buck converter operating in AAM mode during system sleep, maintaining <200μA quiescent draw. Use Value: Internal 170μA Iq and hiccup-mode OCP ensure energy compliance (Energy Star Tier 2) and safe fault containment during panel firmware updates. |
| White Goods Control Board | Industrial IoT Sensor Hub |
|
Use Scenario: Powers MCU, display, and motor control logic in refrigerator or washing machine main control boards. IC Role / Device Role / Timing Role: Main 3.3V system rail converter handling variable loads from 10mA (idle) to 2.5A (compressor startup). Use Value: Wide 7.5–26V input accommodates battery-backed or rectified AC inputs; thermal shutdown prevents latch-up during cabinet overheating events. |
Use Scenario: Supplies 5V to multi-sensor fusion module (temperature, humidity, vibration) in predictive maintenance edge gateway. IC Role / Device Role / Timing Role: Isolated secondary-side regulator fed from flyback output, requiring high PSRR and low output ripple. Use Value: 10mVP-P output ripple at 2.5A (measured) ensures ADC reference stability; FB pin's 50nA input current minimizes divider error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2335GJ-Z | Lower 3.3A rating, 500kHz fSW, same TSOT23-6 package but no AAM mode | Lacks light-load PFM; higher Iq (250μA) makes it unsuitable for battery-backed standby rails | Choose only if fixed 500kHz timing sync is required and light-load efficiency is not critical |
| TPS562211DDFR | TI part with 2.5A rating, 650kHz fSW, external compensation, no integrated bootstrap diode path | Requires external loop compensation components; lacks SW anti-ringing, increasing EMI filter burden | Select when design requires adjustable loop bandwidth or compatibility with TI's WEBENCH ecosystem |
Compared with MP2345GJ-P, MP2335GJ-Z trades light-load efficiency for marginally higher current, while TPS562211DDFR adds design flexibility at the cost of board area and EMI mitigation complexity - MP2345GJ-P uniquely balances integration, EMI performance, and ultra-low Iq in a 6-pin footprint.
Availability
MP2345GJ-P is available at Aetrix Electronics and suitable for RF power amplifier biasing, flat-panel display standby supplies, and white goods control boards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2345GJ-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2345 belongs to MPS's high-efficiency synchronous buck converter product line, engineered for compact, low-EMI power delivery in space-constrained consumer, industrial, and telecom applications where thermal performance and light-load efficiency are critical.
FAQ
What is the minimum recommended output voltage for MP2345GJ-P?
The MP2345GJ-P supports adjustable output voltages starting from 3.3V using the internal 0.791V feedback reference and external resistor divider. The datasheet confirms stable regulation down to 3.3V; lower outputs require external reference or different topology due to FB voltage limitation and duty-cycle constraints.
Does MP2345GJ-P require an external bootstrap diode?
No - MP2345GJ-P includes internal bootstrap charging circuitry and operates reliably with only a 0.1μF ceramic capacitor between BST and SW pins. An external diode from VOUT to BST is optional and recommended only for 5V-output designs to improve efficiency by ~1–2% under full load.
How does the hiccup-mode over-current protection behave during sustained short-circuit?
When FB voltage drops below 396mV (indicating severe overload), the MP2345GJ-P enters hiccup mode: it disables switching, waits ~30ms, then attempts restart. This limits average short-circuit current to ~1.25A and keeps junction temperature below 130°C, preventing thermal damage during extended faults.
Can MP2345GJ-P operate with input voltage below 7.5V?
No - the absolute minimum operating input is 7.5V per the Recommended Operating Conditions table. Below this, the UVLO circuit disables the device. The absolute maximum rating allows -0.3V to +28V, but functional operation is guaranteed only within 7.5V–26V.
What is the thermal resistance (θJA) of MP2345GJ-P on a standard 2-layer PCB?
On the EV2345-J-00A 2-layer evaluation board (64mm × 48mm), θJA is measured at 62°C/W. This value assumes proper thermal pad soldering and copper pour; actual performance depends on PCB layout - adding thermal vias to inner ground planes can reduce θJA by 15–25%.
Is MP2345GJ-P compatible with ceramic output capacitors only?
No - MP2345GJ-P supports ceramic, tantalum, or low-ESR electrolytic output capacitors. Ceramic is preferred for lowest ripple and stability; for tantalum/electrolytic, ESR dominates ripple calculation (Equation 9), so values ≤30mΩ are recommended to maintain regulation accuracy and transient response.
What is the purpose of the 15pF capacitor (C5) shown in the typical application schematic?
C5 (15pF) is a feedforward capacitor placed across the upper feedback resistor (R1). It improves phase margin and transient response by introducing a zero in the control loop, compensating for the pole introduced by the output capacitor's ESR and inductor - especially beneficial with low-ESR ceramic outputs.
MP2345GJ-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 24.18V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MP2345GJ-P FAQ
1.How can I place an order for MP2345GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2345GJ-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 MP2345GJ-P reliable?
The price and inventory of MP2345GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2345GJ-P is usually 5 days.
3.What payment methods are accepted for MP2345GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2345GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2345GJ-P?
MP2345GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2345GJ-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 MP2345GJ-P?
For technical support, including MP2345GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2345GJ-P requirements.
6.How does Aetrix verify that MP2345GJ-P is sourced from the original manufacturer or authorized distributors?
All MP2345GJ-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 MP2345GJ-P meets industry standards.
7.What is the process for return or replacement of MP2345GJ-P?
All MP2345GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2345GJ-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 MP2345GJ-P part is unused and in its original packaging.
Return procedure for MP2345GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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