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Monolithic Power Systems Inc. MP2345GJ-Z
- Part No.:
- MP2345GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP2345GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 2.5A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,087
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Product details
Overview
MP2345GJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 90mΩ high-side and 40mΩ low-side MOSFETs, delivering 2.5A continuous output current across a 7.5V–26V input range. It operates at a fixed 600kHz switching frequency in CCM mode, features internal soft-start, over-current protection with hiccup recovery, and thermal shutdown - deployed in compact RF-enabled devices and flat-panel display power rails.
For engineers reviewing the MP2345GJ-Z datasheet, MP2345GJ-Z pinout, MP2345GJ-Z application, or MP2345GJ-Z equivalent, this page delivers verified electrical parameters, TSOT23-6 package layout guidance, EMI-optimized switching behavior, and real-world design constraints for industrial and consumer power supply integration.
Technical Context
The MP2345GJ-Z uses peak-current-mode control with an internal 0.791V reference and cycle-by-cycle over-current limiting triggered at 3.5–5.5A. Its AAM (Advanced Asynchronous Modulation) power-save mode enables PFM operation under light loads by blocking the internal clock when COMP voltage falls below 0.4V.
Bootstrap charging is managed via an internal floating driver with UVLO (2.2V rising threshold, 150mV hysteresis), while the VCC LDO regulates from VIN across the full 7.5V–26V range and requires a 0.1µF ceramic decoupling capacitor. Frequency foldback activates when FB drops below 396mV, reducing fSW to 0.2× nominal during short-circuit faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 26V - supports wide industrial and automotive battery-supplied inputs without external pre-regulation. |
| Output Current | 2.5A continuous - sufficient for powering SoC cores, FPGAs, or display logic in space-constrained designs. |
| Switching Frequency | 600kHz ±100kHz - balances efficiency, inductor size, and EMI filtering requirements in compact layouts. |
| RDS(ON) (HS/LS) | 90mΩ / 40mΩ - minimizes conduction loss and thermal rise at full load in TSOT23-6 package. |
| Feedback Voltage | 791mV ±16mV - sets precise output regulation; used with resistor divider to configure 3.3V–26V outputs. |
| Soft-Start Time | 1.5ms (10%–90%) - prevents output overshoot and inrush current during power-up sequencing. |
| OCP Threshold | 4.5A typical - provides robust short-circuit protection with hiccup-mode recovery to limit average fault current. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die integrity during sustained overload or poor PCB thermal design. |
Pinout & Package
MP2345GJ-Z is housed in a thermally enhanced, lead-free TSOT23-6 package (JEDEC MO-193 AB), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and exposed pad for improved heat dissipation. The package supports MSL Level 1 handling per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply rail | Accepts 7.5V–26V; requires local 10µF+ ceramic decoupling with wide PCB traces to minimize impedance. |
| 2 SW | Switch node | Drives external inductor; connects to BST capacitor; must be routed away from analog nodes (e.g., FB) to reduce coupling. |
| 3 GND | Power ground reference | Primary return path for HS/LS MOSFETs and output capacitor; requires low-inductance connection via multiple vias. |
| 4 BST | Bootstrap supply | Connects to SW via 0.1µF ceramic capacitor; powers high-side gate driver; optional external diode improves efficiency at 5V output. |
| 5 VCC | Internal LDO output | Supplies internal circuitry; decoupled with 0.1–0.22µF capacitor; can be biased externally via diode from VOUT for higher efficiency. |
| 6 FB | Feedback input | Senses output voltage via resistor divider; internal 791mV reference; short-circuit detection triggers foldback when FB < 396mV. |
Key Features
| Feature | Design Value |
|---|---|
| Optimized low-EMI switching edge | SW anti-ringing circuitry suppresses high-frequency radiation, easing EMC compliance in RF-sensitive applications. |
| Internal power-save mode (AAM) | Enables PFM operation below ~100mA load, reducing quiescent current to 170µA and improving light-load efficiency. |
| Integrated MOSFETs with matched RDS(ON) | 90mΩ HS + 40mΩ LS reduces conduction loss and eliminates external FET selection, simplifying BOM and layout. |
| Fixed 600kHz CCM operation | Ensures predictable EMI profile and stable loop response; avoids sub-harmonic oscillation without slope compensation. |
| Robust protection suite | OCP with hiccup recovery, thermal shutdown, and UVLO (6.3V rising / 5.83V falling) prevent damage under fault conditions. |
Applications
| RF-Enabled Devices | Stand-By Power Supply |
|---|---|
|
Use Scenario: Powering cellular modem baseband processors and RF front-end bias rails in IoT gateways and portable hotspots. IC Role / Device Role / Timing Role: Primary buck regulator supplying clean, regulated 3.3V/2.5A to noise-sensitive RF ICs with minimal conducted EMI. Use Value: Low-RDS(ON) MOSFETs and optimized switching edges reduce thermal stress and radiated emissions near antenna modules. |
Use Scenario: Providing always-on 5V/1A standby voltage for microcontrollers and real-time clocks in smart appliances and HVAC controllers. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in AAM mode during deep sleep, maintaining <200µA quiescent draw. Use Value: Internal soft-start and UVLO ensure reliable wake-up sequencing without brown-out resets during line transients. |
| White Goods | Flat-Panel Television and Monitors |
|
Use Scenario: Generating 5V/2.5A main logic supply for MCU, display interface, and sensor hubs in refrigerators and washing machines. IC Role / Device Role / Timing Role: Main DC/DC converter handling wide-input 12–24V battery or adapter inputs with robust thermal performance. Use Value: 150°C thermal shutdown and 2.5A current capability sustain operation in enclosed, high-ambient-temperature enclosures. |
Use Scenario: Delivering 5V/2.5A to TCON (timing controller) and backlight driver logic in LCD/LED TV power boards. IC Role / Device Role / Timing Role: Compact, high-density buck converter mounted near display subsystem to minimize trace inductance and ripple. Use Value: TSOT23-6 footprint and internal compensation reduce board area vs. discrete solutions while meeting strict EMI limits. |
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 |
|---|---|---|---|
| RT6203BGQW | 3A rated, 2.5MHz switching, no internal bootstrap diode support, 0.8V FB reference | Better suited for ultra-compact, high-frequency designs where inductor size is critical; lacks AAM mode | Select when board space is constrained and >1MHz operation is acceptable; verify loop stability with external compensation. |
| TPS562201DDCR | 2A rated, 500kHz, integrated compensation, 0.6V FB reference, no BST pin - uses single-supply gate drive | Lower current capacity and simpler bootstrap architecture; optimized for cost-sensitive, medium-power applications | Choose for lower-cost BOMs where 2A output suffices and external BST capacitor routing complexity must be avoided. |
Compared with RT6203BGQW and TPS562201DDCR, MP2345GJ-Z delivers higher output current (2.5A), wider input range (7.5–26V), and dedicated BST pin enabling flexible external diode integration - making it optimal for industrial and display power rails requiring robustness and layout flexibility.
Availability
MP2345GJ-Z is available at Aetrix Electronics and suitable for RF-enabled devices, white goods, and flat-panel television power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2345GJ-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 power management ICs, with design expertise in DC/DC converters, LED drivers, and motor drivers since 1997.
The MP2345 belongs to MPS's high-voltage synchronous buck converter product line, engineered for industrial, consumer, and computing applications demanding wide-input operation, compact footprint, and low-EMI power delivery.
FAQ
What is the minimum recommended input voltage for reliable startup?
The MP2345GJ-Z has a VIN under-voltage lockout (UVLO) rising threshold of 6.3V typical. Startup is guaranteed only when input voltage exceeds this value; operation below 5.2V (minimum UVLO threshold) will disable the device. For stable 7.5V–26V operation, ensure input stays above 6.3V during all transient conditions.
Can MP2345GJ-Z regulate output voltages below 3.3V?
No - the datasheet specifies "output adjustable from 3.3V", and the feedback reference is fixed at 791mV. Configuring outputs below 3.3V would require FB voltage below 791mV, violating the internal error amplifier operating range and compromising regulation accuracy and stability.
Is an external bootstrap diode required for normal operation?
No - the MP2345GJ-Z includes internal bootstrap charging circuitry. An external diode from VOUT to BST is optional and recommended only for 5V-output designs to improve efficiency by ~1–2% under heavy load, as stated in the application notes.
What is the maximum allowable junction temperature during continuous operation?
The absolute maximum junction temperature is 150°C, with thermal shutdown activating at that point. For reliable continuous operation, design for a maximum junction temperature ≤125°C using θJA = 62°C/W (2-layer PCB) or θJA = 100°C/W (JESD51-7 4-layer board), factoring in ambient temperature and power dissipation.
How does the frequency foldback feature behave during overload?
When FB voltage drops below 396mV - indicating severe overload or short-circuit - the oscillator frequency folds back to 20% of nominal (e.g., ~120kHz at 600kHz nominal). This reduces switching loss and average fault current while maintaining hiccup-mode restart attempts until the fault clears.
Does MP2345GJ-Z support external synchronization?
No - the MP2345GJ-Z uses an internal fixed-frequency oscillator and does not provide an external SYNC pin or frequency adjustment capability. Its 600kHz operation is non-synchronizable; for synchronized multi-rail systems, consider MPS's MP2338 or MPQ4331 series.
What is the recommended input capacitor RMS current rating?
Per Equation (5) in the datasheet, worst-case input capacitor RMS current equals half the maximum load current (1.25A for 2.5A output). Therefore, select a ceramic or polymer capacitor rated for ≥1.3A RMS, with low ESR and X5R/X7R dielectric for stable performance across temperature.
MP2345GJ-Z 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):
- 24.2V
- 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-Z FAQ
1.How can I place an order for MP2345GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2345GJ-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 MP2345GJ-Z reliable?
The price and inventory of MP2345GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2345GJ-Z is usually 5 days.
3.What payment methods are accepted for MP2345GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2345GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2345GJ-Z?
MP2345GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2345GJ-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 MP2345GJ-Z?
For technical support, including MP2345GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2345GJ-Z requirements.
6.How does Aetrix verify that MP2345GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2345GJ-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 MP2345GJ-Z meets industry standards.
7.What is the process for return or replacement of MP2345GJ-Z?
All MP2345GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2345GJ-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 MP2345GJ-Z part is unused and in its original packaging.
Return procedure for MP2345GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP2345GJ-Z Tags
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TPS562201DDCR
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MC34063ABD-TR
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TPS561201DDCR
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MC33063ADR
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TLV61048DBVR
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AZ34063UMTR-G1
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MC34063EBD-TR
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