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Monolithic Power Systems Inc. MP2318GJ-P
- Part No.:
- MP2318GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2318GJ-P.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:709
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Product details
Overview
MP2318GJ-P from Monolithic Power Systems is a high-frequency synchronous step-down DC/DC converter with integrated 90mΩ/40mΩ MOSFETs, delivering 2A continuous output current across a 4.5V–24V input range, fixed 2MHz switching frequency, and adjustable 0.8V–VIN×DMAX output voltage. It serves as the primary power stage for I/O rails in space-constrained notebook systems and flat-panel displays.
For engineers reviewing the MP2318GJ-P datasheet, MP2318GJ-P pinout, MP2318GJ-P application, or MP2318GJ-P equivalent, key selection criteria include its AAM power-save mode behavior, thermal shutdown threshold (150°C), EN pin hysteresis (80–220mV), and TSOT23-8 package layout constraints for high-current SW/BST routing.
Technical Context
The MP2318GJ-P employs peak current-mode control with internal compensation, enabling stable regulation without external loop components. Its fixed 2MHz oscillator supports compact filter design, while cycle-by-cycle overcurrent protection triggers hiccup mode upon sustained short-circuit conditions.
AAM modulation dynamically transitions between PWM and PFM based on COMP voltage versus externally set AAM reference, optimizing light-load efficiency without compromising transient response. The bootstrap driver uses an internal charge pump with UVLO (2.2V rising threshold) to sustain high-side gate drive during duty cycles up to 83%.
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 adapter supplies. |
| Output Current | 2A continuous - sufficient for powering core logic, DDR termination, or display interface ICs. |
| Switching Frequency | Fixed 2MHz ±15% - enables use of sub-2.2μH inductors and reduces output capacitor size. |
| Feedback Reference | 798mV typical - sets output voltage via resistor divider; tolerance impacts absolute VOUT accuracy. |
| HS/LS RDS(on) | 90mΩ / 40mΩ - low conduction loss enables >92% efficiency at 12V→3.3V/2A. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during sustained overload or poor PCB thermal design. |
| EN Threshold | 1.4V typical rising, 80–220mV hysteresis - ensures clean enable/disable with noise margin in noisy environments. |
Pinout & Package
MP2318GJ-P is housed in an 8-pin TSOT23 package with 0.65mm pitch, requiring tight thermal vias under the exposed pad (GND) and wide copper for SW/BST traces to manage 2A pulsed currents.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AAM | Advanced Asynchronous Modulation control | Resistor-to-GND sets transition point between PWM and PFM modes; floating or pulled high forces CCM operation. |
| 2 IN | Main power input | Accepts 4.5–24V; requires local 22μF ceramic decoupling with low-ESR layout. |
| 3 SW | Switch node | High dv/dt node connecting to inductor; must be routed away from FB/EN to prevent coupling. |
| 4 GND | Power and signal ground | Reference for all voltages; requires direct low-inductance connection to input/output capacitors. |
| 5 BST | Bootstrap supply | Drives high-side MOSFET gate; requires 0.1μF ceramic capacitor between BST and SW pins. |
| 6 EN | Enable control | Digital input with internal 1MΩ pull-down; clamped to 6.5V zener for overvoltage protection. |
| 7 VCC | Bias regulator output | Internal 5V rail; decoupled with 0.1–0.22μF capacitor; powers internal circuitry. |
| 8 FB | Feedback input | Senses output voltage via resistor divider; high-impedance (10–50nA) node sensitive to noise. |
Key Features
| Feature | Design Value |
|---|---|
| AAM Power-Save Mode | Automatically shifts to PFM at light loads using user-adjustable AAM pin voltage, reducing quiescent current to 0.2mA. |
| Integrated Power MOSFETs | 90mΩ HS + 40mΩ LS switches eliminate external FETs and gate drivers, shrinking BOM and layout area. |
| Internal Soft-Start | 1.5ms typical ramp time prevents output overshoot during startup without external timing components. |
| OCP with Hiccup Recovery | Detects overcurrent per cycle and enters periodic restart mode during sustained shorts, limiting average power dissipation. |
| TSOT23-8 Package | 2.9mm × 1.6mm footprint with exposed thermal pad enables high-power density in ultra-thin applications. |
Applications
| Notebook I/O Power Rail | Digital Set-Top Box SoC 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 buck regulator delivering stable 3.3V/2A with fast load transient response to handle burst data transfers. Use Value: Fixed 2MHz operation allows <1μH inductor, reducing solution height to <1.2mm - critical for thin clamshell designs. | Use Scenario: Supplies 1.2V core voltage to ARM-based media processor in cost-sensitive STB designs. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from 12V intermediate bus, supporting dynamic voltage scaling. Use Value: AAM mode achieves >85% efficiency at 50mA load, extending standby battery life in always-on tuner modules. |
| Flat Panel Display Logic Supply | Industrial Human-Machine Interface |
Use Scenario: Generates 5V/2A for timing controller (TCON) and LVDS transmitter in 24-inch LCD monitor. IC Role / Device Role / Timing Role: Main DC/DC stage converting 24V system rail to panel logic voltage with tight line regulation (<±0.5%). Use Value: Wide 4.5–24V input range accommodates both 12V and 24V factory power supplies without redesign. | Use Scenario: Powers microcontroller, touchscreen controller, and CAN transceiver in DIN-rail mounted HMI unit. IC Role / Device Role / Timing Role: Robust power management IC with thermal shutdown and hiccup OCP for unattended operation in harsh environments. Use Value: 150°C thermal shutdown and -40°C to +125°C operating range ensure reliability in enclosed, fanless enclosures. |
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 |
|---|---|---|---|
| MP2315GJ-Z | Lower 1.5A rating, same 2MHz frequency and TSOT23-8 package; lacks AAM mode. | Not suitable for 2A continuous loads; limited to ≤1.5A applications like sensor hubs or low-power peripherals. | Select only when output current requirement is ≤1.5A and light-load efficiency is secondary. |
| RT6220GSP | 3A rating, 500kHz–2.5MHz adjustable frequency, SOP-8 package; no integrated AAM logic. | Requires external compensation and frequency programming; larger footprint but higher current capability. | Choose when 3A output or programmable frequency is required, accepting larger board area and added component count. |
Compared with MP2318GJ-P, MP2315GJ-Z trades current capacity and AAM for cost reduction in lighter loads, while RT6220GSP offers higher current and flexibility at the expense of integration and package size - making MP2318GJ-P optimal for space-constrained 2A applications needing automatic light-load optimization.
Availability
MP2318GJ-P is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box SoC supplies, and flat-panel display logic rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2318GJ-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 power ICs, with over two decades of expertise in DC/DC conversion and motor control solutions.
The MP2318 belongs to MPS's high-frequency synchronous buck converter product line, designed specifically for compact, high-efficiency power delivery in portable and space-constrained consumer electronics.
FAQ
What is the minimum recommended input capacitance for MP2318GJ-P?
The datasheet specifies a minimum 22μF ceramic input capacitor with low ESR, placed as close as possible to the IN and GND pins. This value ensures adequate RMS current handling-especially at VIN = 2×VOUT where input ripple current reaches half the load current-and suppresses high-frequency switching noise from propagating upstream.
Can MP2318GJ-P operate with a 3.3V input supply?
No. The absolute minimum input voltage is 4.5V per the Recommended Operating Conditions table. Attempting operation below this threshold will trigger the 3.9V UVLO rising threshold, preventing startup. For 3.3V input applications, a different regulator such as the MP2307 (3V–24V range) is required.
How does the AAM pin affect light-load efficiency?
The AAM pin sets the COMP voltage threshold that determines the PWM-to-PFM transition point. Lower AAM voltage improves stability and reduces output ripple but degrades light-load efficiency; higher AAM voltage improves efficiency and transient response at the cost of increased ripple. Optimal setting balances these factors per application load profile.
Is an external bootstrap diode required for MP2318GJ-P?
An external bootstrap diode (e.g., 1N4148) is optional and recommended only when VOUT ≥ 3.3V and duty cycle exceeds 65% (i.e., VIN > 5V). It improves high-duty-cycle efficiency by reducing BST capacitor charging losses, but adds component count and layout complexity.
What is the maximum achievable output voltage with MP2318GJ-P?
The maximum output voltage is limited by the maximum duty cycle of 83% and the input voltage: VOUT(MAX) = VIN × 0.83. At VIN = 24V, this yields ~19.9V. However, practical limits arise from feedback resistor voltage ratings and stability-most designs target ≤12V outputs using standard 0805 resistors rated for 100V.
Does MP2318GJ-P support forced PWM mode?
No. MP2318GJ-P does not offer a dedicated forced PWM pin or register control. PWM operation occurs automatically above the AAM threshold; disabling AAM entirely (by pulling AAM to VCC or leaving it floating) forces continuous conduction mode but does not eliminate frequency variation under light loads.
What PCB layout practices are critical for stable MP2318GJ-P operation?
Three practices are essential: (1) short, wide copper traces between IN/GND and their respective pins to minimize switching loop inductance; (2) placement of FB resistors and compensation components within 2mm of the FB pin to avoid noise pickup; and (3) isolation of SW node routing from analog signals (FB, EN, AAM) using ground guard traces or layer separation.
MP2318GJ-P 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-P FAQ
1.How can I place an order for MP2318GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2318GJ-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 MP2318GJ-P reliable?
The price and inventory of MP2318GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2318GJ-P is usually 5 days.
3.What payment methods are accepted for MP2318GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2318GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2318GJ-P?
MP2318GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2318GJ-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 MP2318GJ-P?
For technical support, including MP2318GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2318GJ-P requirements.
6.How does Aetrix verify that MP2318GJ-P is sourced from the original manufacturer or authorized distributors?
All MP2318GJ-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 MP2318GJ-P meets industry standards.
7.What is the process for return or replacement of MP2318GJ-P?
All MP2318GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2318GJ-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 MP2318GJ-P part is unused and in its original packaging.
Return procedure for MP2318GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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