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Monolithic Power Systems Inc. MP2315SGJ-Z
- Part No.:
- MP2315SGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2315SGJ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MP2315SGJ-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 110mΩ/55mΩ MOSFETs, delivering 3A continuous output current across a 4.5V–24V input range, fixed 500kHz switching frequency, and adjustable 0.8V–VIN output voltage-used in notebook I/O power rails and flat-panel display bias supplies.
For engineers reviewing the MP2315SGJ-Z datasheet, MP2315SGJ-Z pinout, MP2315SGJ-Z application, or MP2315SGJ-Z equivalent, this page delivers verified technical context, validated pin functions, confirmed protection features (OCP/OVP/thermal shutdown), AAM power-save mode behavior, and real-world design constraints for compact high-efficiency buck regulation.
Technical Context
The MP2315SGJ-Z employs current-mode control with internal 0.791V feedback reference and cycle-by-cycle over-current limiting, enabling fast transient response and stable loop compensation without external components. Its integrated high-side/low-side MOSFETs operate in synchronous rectification mode to maximize efficiency across load range.
It implements advanced asynchronous modulation (AAM) for light-load efficiency, where AAM pin voltage sets the PWM-to-PFM transition threshold; internal 5.1V VCC LDO powers all circuitry, and bootstrap charging via BST pin enables high-side gate drive with external capacitor and optional diode.
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 | 3A continuous - sufficient for powering FPGA I/O banks, USB-C PD sink rails, or display timing controllers. |
| Switching Frequency | Fixed 500kHz - enables use of compact 4.7µH inductors and reduces EMI filtering complexity. |
| Feedback Reference | 0.791V ±9mV - sets output voltage accuracy; used with external resistor divider for precise 1.05V–5V regulation. |
| Internal MOSFET RDS(on) | 110mΩ (HS) / 55mΩ (LS) - minimizes conduction loss at full load, supporting >92% peak efficiency at 12V→5V/3A. |
| Protection Features | OCP (5.5A typ), OVP (120% VREF trip), thermal shutdown (150°C), hiccup-mode fault recovery - ensures robust operation under short-circuit or over-temp conditions. |
| Quiescent Current | 120μA - enables low-power standby modes in battery-backed systems without compromising wake-up latency. |
Pinout & Package
MP2315SGJ-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density PCB layouts with exposed thermal pad connection to GND plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AAM) | Advanced Asynchronous Modulation control | Sets light-load PFM transition threshold; tie to VCC or float to disable AAM and force CCM operation. |
| 2 (IN) | Main input supply rail | Accepts 4.5V–24V; requires local 22μF ceramic decoupling capacitor placed near pin with low-inductance trace. |
| 3 (SW) | Power switch node | Connects to inductor and bootstrap network; must be routed with wide copper to minimize switching loss and EMI. |
| 4 (GND) | System ground reference | Primary return path for power and feedback; requires direct low-impedance connection to thermal pad and input/output capacitors. |
| 5 (BST) | Bootstrap supply for high-side driver | Requires 0.1μF–1μF ceramic capacitor between BST and SW; external diode recommended for >65% duty cycles. |
| 6 (EN) | Enable control input | Logic-high (>1.4V) enables regulation; internal 1MΩ pull-down allows floating shutdown; clamped at 5.6V Zener. |
| 7 (VCC) | Internal 5.1V LDO output | Supplies internal circuitry; requires 0.1μF–0.22μF ceramic decoupling capacitor placed adjacent to pin. |
| 8 (FB) | Feedback voltage sense | Monitors output via resistor divider; internal 791mV reference enables accurate output setting from 0.8V up to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Co-packaged 110mΩ HS and 55mΩ LS MOSFETs eliminate external switch selection and layout complexity. |
| AAM Light-Load Mode | Reduces switching frequency below 100mA load to maintain >85% efficiency at 1mA, critical for always-on subsystems. |
| Internal Soft-Start | 1.5ms typical ramp time prevents output overshoot and inrush current during power-up into pre-biased loads. |
| Output Over-Voltage Protection | Dynamically forces LS-FET on to discharge output when FB exceeds 120% VREF, protecting downstream logic from 5.5V+ faults. |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C and re-enables at ~130°C, preventing thermal runaway while allowing safe restart after cooling. |
Applications
| Notebook I/O Power Rail | Digital Set-Top Box Core Supply |
|---|---|
Use Scenario: Regulating 5V/3A from 19V adapter for USB 3.0 hub and PCIe switch logic in ultrabook platforms. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with pre-bias start-up capability and monotonic voltage ramp. Use Value: Eliminates need for external MOSFET drivers and compensates for wide input variation without loop redesign. |
Use Scenario: Generating stable 3.3V/3A for SoC I/O, HDMI PHY, and DDR termination in cable/satellite receivers. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with hiccup-mode OCP for reliable field operation. Use Value: Maintains <±1% output regulation across line/load transients and survives sustained short-circuit events. |
| Flat Panel Monitor Bias Supply | Industrial PLC Digital Input Module |
Use Scenario: Providing 1.8V/3A for timing controller and LVDS transmitter in 24-inch LCD panels. IC Role / Device Role / Timing Role: Compact, low-noise buck stage with tight 0.791V reference and minimal external components. Use Value: Enables single-layer PCB implementation with <25mm² footprint and meets EN55022 Class B conducted EMI limits. |
Use Scenario: Delivering isolated 2.5V/3A for microcontroller core and ADC reference in DIN-rail mounted automation modules. IC Role / Device Role / Timing Role: Robust DC-DC stage with UVLO (4.05V rising), thermal shutdown, and -40°C to +125°C operation. Use Value: Ensures uninterrupted operation in unventilated enclosures with ambient temperatures up to 85°C. |
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 |
|---|---|---|---|
| MP2315DJ-LF-Z | Same die, but in smaller DFN-8 (2mm × 2mm) package with wettable flanks; no exposed thermal pad. | Better thermal performance in space-constrained designs; requires different PCB land pattern and reflow profile. | Select when board area is limited and thermal vias to internal layers are impractical. |
| RT7295BGJ8F | 4A rated, 600kHz switching, 120mΩ/70mΩ MOSFETs; lacks AAM mode and has 0.8V reference. | Higher current headroom but lower light-load efficiency; requires external soft-start capacitor. | Choose when peak load exceeds 3A or when fixed-frequency stability is prioritized over ultra-low IQ. |
Compared with MP2315SGJ-Z, MP2315DJ-LF-Z offers superior thermal resistance (θJA = 75°C/W vs. 100°C/W) in tighter footprints, while RT7295BGJ8F trades AAM efficiency for higher current rating and simplified enable sequencing-making each suitable for distinct thermal, size, or load-profile constraints.
Availability
MP2315SGJ-Z is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box core supplies, and flat panel monitor bias circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2315SGJ-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2315S product line targets compact, high-efficiency DC-DC conversion for portable and space-constrained electronics, emphasizing integration, thermal resilience, and ease of system-level validation.
FAQ
What is the minimum output voltage achievable with MP2315SGJ-Z?
The MP2315SGJ-Z supports output voltages down to 0.8V, set by the internal 0.791V feedback reference and external resistor divider. At 0.8V output, the FB pin sees exactly 0.791V; lower outputs are not supported due to reference voltage limitation and internal comparator thresholds.
Can MP2315SGJ-Z operate with a 3.3V input supply?
No-MP2315SGJ-Z has a 4.5V minimum input voltage due to its internal UVLO threshold of 4.05V (rising) and requirement for sufficient headroom across the internal 5.1V VCC LDO. Operation below 4.5V risks erratic startup or complete disablement.
Is an external bootstrap diode required for MP2315SGJ-Z?
An external bootstrap diode (e.g., 1N4148) is recommended only when duty cycle exceeds 65%-typically at VOUT ≥ 5V with VIN ≤ 7.7V. It improves BST capacitor recharge efficiency and prevents bootstrap voltage droop during high-duty-cycle operation.
How does AAM mode affect transient response at light loads?
In AAM mode, transient response degrades slightly due to pulse-skipping behavior: load steps from 1mA to 100mA may exhibit 10–20μs longer recovery than in forced CCM, but output deviation remains within ±2% due to internal error amplifier bandwidth optimization.
What is the maximum allowable ripple current for the input capacitor?
The input capacitor must handle RMS current up to 1.5A (half the 3A load current) under worst-case condition (VIN = 2×VOUT). Ceramic X5R/X7R types rated for ≥2A RMS ripple current and ≥25V WVDC are recommended to ensure reliability and low impedance at 500kHz.
Does MP2315SGJ-Z support pre-biased output start-up?
Yes-MP2315SGJ-Z implements monotonic pre-bias start-up: if the output is already biased before enable, the IC refreshes BST voltage and charges the soft-start capacitor only after detecting valid VFB and VBST thresholds, preventing reverse current flow or output collapse.
What is the thermal resistance (θJA) of the TSOT23-8 package under standard JEDEC 4-layer PCB conditions?
The published θJA for MP2315SGJ-Z in TSOT23-8 is 100°C/W when measured per JESD51-7 on a 4-layer PCB with 1-in² copper pour and 2oz copper weight-this value assumes optimal thermal via placement beneath the exposed pad connected to internal GND planes.
MP2315SGJ-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):
- 22.8V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2315SGJ-Z FAQ
1.How can I place an order for MP2315SGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2315SGJ-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 MP2315SGJ-Z reliable?
The price and inventory of MP2315SGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2315SGJ-Z is usually 5 days.
3.What payment methods are accepted for MP2315SGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2315SGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2315SGJ-Z?
MP2315SGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2315SGJ-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 MP2315SGJ-Z?
For technical support, including MP2315SGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2315SGJ-Z requirements.
6.How does Aetrix verify that MP2315SGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2315SGJ-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 MP2315SGJ-Z meets industry standards.
7.What is the process for return or replacement of MP2315SGJ-Z?
All MP2315SGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2315SGJ-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 MP2315SGJ-Z part is unused and in its original packaging.
Return procedure for MP2315SGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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