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Monolithic Power Systems Inc. MP2318GJ-Z
- Part No.:
- MP2318GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2318GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,895
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Product details
Overview
MP2318GJ-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 90mΩ/40mΩ MOSFETs, delivering 2A continuous output current across 4.5V–24V input range, fixed 2MHz switching frequency, and adjustable 0.8V–VIN×0.83 output voltage - deployed in notebook I/O power rails and flat-panel display bias supplies.
For engineers reviewing the MP2318GJ-Z datasheet, MP2318GJ-Z pinout, MP2318GJ-Z application, or MP2318GJ-Z equivalent, this page delivers verified package mapping (TSOT23-8), confirmed AAM power-save mode behavior, thermal shutdown at 150°C, EN threshold of 1.4V typ, and FB reference voltage of 798mV - all critical for compact high-efficiency buck design validation.
Technical Context
The MP2318 operates in peak-current-mode control with internal 0.8V reference and optimized compensation, enabling stable regulation without external loop components. Its AAM (Advanced Asynchronous Modulation) logic dynamically transitions between PWM and PFM based on COMP voltage versus externally set VAAM threshold.
Bootstrap charging is managed via internal floating driver with 2.2V UVLO and 150mV hysteresis; the BST capacitor forms a charge pump with SW node to sustain high-side gate drive. Thermal shutdown activates at 150°C with 20°C hysteresis, and hiccup-mode OCP triggers when FB drops below 400mV under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide industrial and consumer input rails including 12V and 19V systems. |
| Output Current | 2A continuous - sufficient for powering core logic, DDR termination, or display backlight drivers. |
| Switching Frequency | Fixed 2MHz ±15% - enables use of sub-2mm height inductors and reduces output filter size. |
| Feedback Reference | 798mV typ - sets output voltage via resistor divider; tolerance ±1.7% ensures tight VOUT accuracy. |
| HS/LS RDS(on) | 90mΩ / 40mΩ - minimizes conduction loss at full load, supporting >92% efficiency at 12V→3.3V/2A. |
| Quiescent Current | 0.2mA typ in AAM mode - extends battery runtime in always-on subsystems. |
| Thermal Shutdown | 150°C activation - protects die during sustained overload or poor PCB thermal design. |
Pinout & Package
MP2318GJ-Z is housed in an 8-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for space-constrained PCB layouts with exposed thermal pad (pin 4 GND). Pin pitch is 0.65mm; pin 1 is marked by dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AAM | AAM voltage setting input | Connect resistor to GND to define light-load PFM transition point; float or tie to VCC for forced CCM. |
| 2 IN | Main power input | Accepts 4.5–24V; requires local 22µF ceramic decoupling; wide trace routing essential for low impedance. |
| 3 SW | Power switch node | Drives external inductor; high di/dt path - must avoid coupling to analog pins like FB or AAM. |
| 4 GND | System ground reference | Primary return for power and feedback; connect directly to thermal pad and input/output caps with multiple vias. |
| 5 BST | Bootstrap supply for HS gate driver | Requires 0.1µF ceramic cap between BST and SW; internal charge pump sustains gate voltage above VIN. |
| 6 EN | Enable control input | Logic-high ≥1.4V enables regulator; internal 1MΩ pull-down allows direct VIN connection with ≥55kΩ series resistor. |
| 7 VCC | Bias supply output | Internal 5V LDO powers control circuitry; decouple with 0.1µF ceramic close to pin; max 0.22µF allowed. |
| 8 FB | Feedback voltage sense | Monitors resistive divider output; internal 0.8V reference enables precise VOUT adjustment; sensitive to noise. |
Key Features
| Feature | Design Value |
|---|---|
| AAM Power-Save Mode | Automatically shifts to PFM at light loads using programmable AAM threshold - reduces IQ to 0.2mA while maintaining regulation. |
| Integrated Power MOSFETs | 90mΩ HS + 40mΩ LS switches eliminate external FETs and gate drivers - cuts BOM count and layout area by >30%. |
| Internal Soft-Start | 1.5ms typical ramp time - prevents output overshoot and inrush current during startup without external capacitor. |
| Hiccup-Mode OCP | Triggers when FB <400mV; limits average short-circuit current to ~300mA - avoids thermal runaway during sustained faults. |
| Fixed 2MHz Operation | Enables use of 1µH inductors and 22µF ceramic output caps - achieves full regulation in <30mm² footprint. |
Applications
| Portable Notebook I/O Rail | Digital Set-Top Box Core Supply |
|---|---|
Use Scenario: Powers USB controller, PCIe switch, and SATA PHY in ultrabook platforms with 12V or 19V adapter input. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 3.3V/2A with fast transient response to burst data traffic. Use Value: AAM mode extends battery life during idle; 2MHz switching avoids AM radio band interference; TSOT23-8 fits tight motherboard edge zones. |
Use Scenario: Supplies 1.2V/2A to SoC cores and 3.3V/2A to HDMI interface in cable/satellite STB designs. IC Role / Device Role / Timing Role: Dual-rail generation via two MP2318GJ-Z units - one per rail - with independent enable and feedback tuning. Use Value: Internal compensation eliminates loop stability tuning; hiccup OCP prevents field failures from ESD-induced latch-up on HDMI lines. |
| Flat Panel Display Bias | Industrial Human-Machine Interface |
Use Scenario: Generates 5V/2A for LCD timing controller and 1.8V/2A for embedded microcontroller in 24-inch monitor mainboard. IC Role / Device Role / Timing Role: Secondary buck stage downstream of AC/DC front-end; regulates against line ripple and load steps from backlight dimming. Use Value: 4.5–24V input range accommodates 12V/24V universal input; 90mΩ/40mΩ RDS(on) maintains >90% efficiency at full brightness. |
Use Scenario: Powers ARM Cortex-M7 MCU, CAN transceiver, and isolated ADC in factory-floor HMI panel with 24V DC input. IC Role / Device Role / Timing Role: Main system rail converter - withstands 28V transients per ABS MAX rating and provides clean 3.3V for real-time control logic. Use Value: Thermal shutdown at 150°C ensures reliability in unventilated enclosures; EN pin enables firmware-controlled power sequencing. |
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 |
|---|---|---|---|
| RT6220AGQW | 3A rated, 500kHz–2.5MHz programmable frequency, no AAM mode, requires external compensation. | Lacks automatic light-load efficiency optimization; better suited for constant-load industrial sensors than battery-powered UI. | Choose when higher current headroom and frequency flexibility outweigh AAM benefits and layout simplicity. |
| TPS562211DDFR | 2A, 4.5–18V input, 500kHz fixed frequency, integrated compensation, but no AAM or hiccup OCP. | Missing hiccup protection increases risk during CAN bus fault injection tests; lower VIN max excludes 24V systems. | Select only for 12V-only designs where cost sensitivity overrides robustness requirements in harsh environments. |
Compared with RT6220AGQW and TPS562211DDFR, MP2318GJ-Z uniquely combines AAM-based light-load efficiency, hiccup-mode fault containment, and 24V input support in a single TSOT23-8 package - making it optimal for space-limited, battery-aware, and 24V-tolerant applications where reliability and footprint are co-prioritized.
Availability
MP2318GJ-Z is available at Aetrix Electronics and suitable for notebook systems, digital set-top boxes, flat panel television and monitors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2318GJ-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 power ICs, headquartered in Kirkland, WA, with global design and support centers.
The MP2318 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for compact, high-efficiency DC-DC conversion in portable and display electronics where thermal density and board area are critical constraints.
FAQ
What is the minimum recommended input capacitance for MP2318GJ-Z?
A 22µF X5R/X7R ceramic capacitor is recommended at the IN pin, placed as close as possible to pins 2 (IN) and 4 (GND). For 24V input operation, add a 0.1µF ceramic in parallel to suppress high-frequency switching noise. Total RMS current rating must exceed 1A to handle worst-case ripple at VIN = 2×VOUT.
Can MP2318GJ-Z operate with a 3.3V input?
No. The absolute minimum operating input voltage is 4.5V per the Recommended Operating Conditions table. At 3.3V, the internal VCC regulator cannot sustain 5V bias, causing functional failure. The UVLO rising threshold is 3.9V, confirming reliable disable below 4.5V.
How is output voltage adjusted on MP2318GJ-Z?
VOUT is set using a resistor divider from output to GND, with the midpoint connected to FB. With internal 798mV reference, VOUT = 0.798V × (1 + R1/R2). For 3.3V output, R1 = 20kΩ and R2 = 6.34kΩ is a validated combination per MPS Application Note AN106.
Does MP2318GJ-Z require an external bootstrap diode?
An external bootstrap diode (e.g., 1N4148) is optional and recommended only when duty cycle exceeds 65% - i.e., VOUT > 0.65 × VIN. For 12V→5V (42% duty), it is unnecessary; for 12V→8.5V (71%), it improves efficiency by ~1.2% by reducing BST capacitor charging losses.
What is the purpose of the AAM pin, and how is it configured?
The AAM pin sets the COMP voltage threshold that determines transition from PWM to PFM mode. Connect a resistor RAAM from AAM to GND to generate VAAM = 6.2µA × RAAM. For 3.3V output, 320kΩ yields ~2.0V - balancing light-load efficiency and transient response per Figure 7 in the datasheet.
Is thermal derating required for continuous 2A operation in TSOT23-8?
Yes. With θJA = 100°C/W, ambient temperature of 60°C, and 2A load at 12V→3.3V (PDISS ≈ 0.7W), junction temperature reaches ~130°C - within safe limit. Above 60°C ambient or with poor copper pour, reduce load current or add airflow to maintain TJ <125°C.
What happens during EN pin assertion if VIN is below UVLO threshold?
If VIN is below 3.9V (UVLO rising threshold), asserting EN high has no effect - the device remains disabled until VIN rises above threshold. Once enabled, dropping VIN below 3.25V (falling threshold) forces shutdown regardless of EN state, preventing brown-out operation.
MP2318GJ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 19.92V
- Current - Output:
- 2A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2318GJ-Z FAQ
1.How can I place an order for MP2318GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2318GJ-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 MP2318GJ-Z reliable?
The price and inventory of MP2318GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2318GJ-Z is usually 5 days.
3.What payment methods are accepted for MP2318GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2318GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2318GJ-Z?
MP2318GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2318GJ-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 MP2318GJ-Z?
For technical support, including MP2318GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2318GJ-Z requirements.
6.How does Aetrix verify that MP2318GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2318GJ-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 MP2318GJ-Z meets industry standards.
7.What is the process for return or replacement of MP2318GJ-Z?
All MP2318GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2318GJ-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 MP2318GJ-Z part is unused and in its original packaging.
Return procedure for MP2318GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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