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Monolithic Power Systems Inc. MP2315SGJ-P
- Part No.:
- MP2315SGJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2315SGJ-P.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:410
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Product details
Overview
MP2315SGJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 110mΩ high-side and 55mΩ low-side 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-P datasheet, MP2315SGJ-P pinout, MP2315SGJ-P application, or MP2315SGJ-P equivalent, this page delivers verified technical context, validated pin functions, confirmed protection features (OCP/OVP/thermal shutdown), real-world efficiency curves, and precise AAM-mode control behavior for pre-biased load and light-load PFM operation.
Technical Context
The MP2315SGJ-P implements peak-current-mode control with internal 0.791V reference and optimized compensation, enabling stable regulation without external loop components. Its current-sense architecture supports monotonic pre-bias start-up and hiccup-mode OCP recovery during output short-circuit faults.
It integrates a 5.1V internal LDO (VCC) powered from VIN, bootstrap circuitry with 2.2V UVLO on BST, and advanced asynchronous modulation (AAM) that dynamically disables PWM pulses under light loads using a 6.7μA AAM current source and externally set threshold-enabling >90% efficiency at 10mA load while maintaining <20mV output ripple.
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 inputs. |
| Output Current | 3A continuous - sufficient for powering SoC I/O domains, DDR memory termination, and FPGA auxiliary rails. |
| Switching Frequency | Fixed 500kHz - enables compact magnetics (e.g., 4.9μH inductor) and predictable EMI filtering design. |
| Feedback Reference | 0.791V ±1.2% - sets output voltage via external resistor divider; enables 0.8V minimum VOUT for modern low-voltage logic. |
| Internal MOSFET RDS(ON) | 110mΩ HS / 55mΩ LS - reduces conduction loss and thermal stress at full load; eliminates need for external power switches. |
| OVP Threshold | 115–125% of VREF - triggers dynamic regulation by forcing LS-FET on to discharge output, preventing damage to downstream 3.3V/5V ICs. |
| Soft-Start Time | 0.8–2.2ms - prevents output overshoot and inrush current during power-up into pre-biased loads. |
Pinout & Package
MP2315SGJ-P is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), featuring exposed pad for improved heat dissipation and JEDEC MO-193BA compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AAM) | Advanced Asynchronous Modulation control | Accepts external voltage divider to set PFM/PWM transition point; 6.7μA internal current source enables precise light-load efficiency tuning. |
| 2 (IN) | Main power input | 4.5–24V supply rail; requires local 22μF ceramic decoupling capacitor placed near pin to suppress high-frequency switching noise. |
| 3 (SW) | Power switch node | Connects to external inductor; carries high di/dt pulsed current-requires wide copper trace and minimal loop area to reduce EMI. |
| 4 (GND) | System ground reference | Common return for FB, EN, VCC, and power stage; must be solid copper plane with multiple vias to minimize ground bounce. |
| 5 (BST) | Bootstrap supply for high-side driver | Requires 0.1–1μF ceramic capacitor between BST and SW; internal UVLO (2.2V) ensures reliable HS-FET gate drive during duty cycles >65%. |
| 6 (EN) | Enable control input | Digital enable with 1.26–1.54V rising threshold; internal 1MΩ pull-down allows floating-disable; clamped to 5.6V Zener for overvoltage protection. |
| 7 (VCC) | Internal 5.1V LDO output | Supplies internal circuitry; requires 0.1–0.22μF ceramic decoupling; not intended to power external loads. |
| 8 (FB) | Output voltage feedback | Monitors resistive divider output; 10–50nA input bias enables high-resistor-value dividers to minimize quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range (4.5–24V) | Supports single-supply designs across 5V USB PD, 12V industrial, and 19V laptop adapter inputs without external pre-regulation. |
| Synchronous Rectification | Eliminates external Schottky diode, reducing BOM count and improving full-load efficiency by up to 8% versus asynchronous alternatives. |
| AAM Power Save Mode | Reduces light-load quiescent current to 120μA while maintaining tight output regulation and fast transient response (<10μs). |
| Integrated Protection Suite | Combines cycle-by-cycle OCP, output OVP with active discharge, thermal shutdown (150°C), and UVLO-enabling robust field operation without external supervision. |
| Pre-Biased Start-Up | Allows safe startup into powered outputs (e.g., hot-swap systems), avoiding reverse current flow or output voltage collapse during sequencing. |
Applications
| Portable Notebook I/O Power | Digital Set-Top Box Core Rail |
|---|---|
|
Use Scenario: Supplying 3.3V/2.5V I/O banks for Intel/AMD mobile chipsets and PCIe controllers in ultrabooks. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load steps up to 2A/μs while maintaining <±1% output accuracy. Use Value: Enables compact, fanless thermal design via 92% peak efficiency at 1.8V/3A and internal MOSFETs eliminating discrete FET layout complexity. |
Use Scenario: Generating stable 1.2V core voltage for ARM-based media processors in cable/satellite STBs. IC Role / Device Role / Timing Role: Main SoC core supply with monotonic start-up into pre-biased 1.2V rail during system wake-from-sleep transitions. Use Value: Prevents processor lockup via hiccup-mode OCP recovery and maintains <10mV output ripple under 100kHz video burst loads. |
| Flat Panel Display Logic Bias | Industrial Human-Machine Interface (HMI) |
|
Use Scenario: Powering TCON (timing controller) and LVDS transmitter ICs in 24-inch LCD monitors. IC Role / Device Role / Timing Role: Secondary buck stage converting 12V panel supply to 5V/3.3V logic rails with low-noise operation. Use Value: Delivers <20mVpp output ripple at 500kHz switching-critical for minimizing display artifacts and EMI coupling into analog video paths. |
Use Scenario: Providing isolated 5V/3.3V rails for ARM Cortex-M7 microcontrollers and CAN transceivers in factory-floor HMIs. IC Role / Device Role / Timing Role: Primary DC/DC converter operating from 24V industrial bus with extended -40°C to +125°C junction temperature support. Use Value: Ensures uninterrupted operation during voltage sags (down to 4.5V IN) and thermal overload events via robust UVLO hysteresis (750mV) and 20°C thermal hysteresis. |
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, TSOT23-6 package with no AAM pin-lacks programmable light-load mode and uses forced CCM only. | Lower component count but sacrifices >10% light-load efficiency; unsuitable for battery-backed or always-on standby systems. | Select when board space is constrained and light-load efficiency is secondary to cost and simplicity. |
| RT7295BGJ8F | 4A rated, 600kHz, 4.5–24V input, but uses external MOSFETs and requires full compensation network. | Higher peak current capability but increases BOM, layout complexity, and thermal management burden. | Select only when >3A output or custom loop tuning is required; otherwise MP2315SGJ-P offers superior integration. |
Compared with MP2315DJ-LF-Z, MP2315SGJ-P adds AAM control for 120μA quiescent current and smoother light-load transitions; compared with RT7295BGJ8F, it trades off 1A headroom for full integration, reduced footprint, and simplified qualification-making it optimal for space-constrained, cost-sensitive 3A applications.
Availability
MP2315SGJ-P is available at Aetrix Electronics and suitable for notebook systems, digital set-top boxes, and flat-panel television power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2315SGJ-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2315 series belongs to MPS's high-efficiency synchronous buck converter product line, engineered specifically for space-constrained consumer and industrial applications demanding integrated power stages, ultra-low quiescent current, and robust fault protection.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2315SGJ-P is optimized for ceramic output capacitors ≥44μF with low ESR. At 5V/3A operation, a 47μF X7R 0805 capacitor meets stability requirements per Figure 9 in the datasheet; lower values risk instability under transient load steps exceeding 1A/μs due to insufficient phase margin.
Can MP2315SGJ-P safely start into a pre-biased output?
Yes-MP2315SGJ-P supports monotonic pre-bias start-up. During startup, its internal soft-start capacitor charges only after BST voltage exceeds 2.2V and FB voltage is below the reference, preventing reverse current flow and ensuring controlled ramp-up even when VOUT is initially at 3.3V or 5V.
How does the AAM pin affect light-load efficiency?
AAM sets the VCOMP threshold for entering PFM mode: a 1.2V AAM voltage enables >90% efficiency at 10mA load by skipping pulses, while 2.0V raises the transition point, extending CCM operation and improving transient response at the cost of ~30μA higher quiescent current.
What is the maximum allowable input voltage for continuous operation?
The absolute maximum VIN rating is +26V, but continuous operation above 24V violates the Recommended Operating Conditions. Sustained 25V input causes excessive power dissipation (>1.25W) in TSOT23-8, triggering thermal shutdown; derating is required above 24V.
Does MP2315SGJ-P require an external bootstrap diode?
An external bootstrap diode (e.g., 1N4148) is recommended only when VOUT ≥ 5V and duty cycle >65% (i.e., VIN > 7.7V for 5V output). It improves BST capacitor charging efficiency and prevents dropout during high-duty-cycle operation, especially at low input voltages near 4.5V.
How is over-current protection implemented during short-circuit conditions?
MP2315SGJ-P uses cycle-by-cycle OCP with hiccup recovery: when inductor current exceeds 4.5–6.5A, output voltage collapses until FB falls below 50% of VREF, then the IC shuts down for ~10ms before retrying-limiting average short-circuit current to <500mA and preventing thermal runaway.
What PCB layout practices are critical for EMI reduction?
Minimize SW-GND loop area by placing input capacitor (22μF ceramic) within 3mm of IN/GND pins; use solid GND plane under IC; route FB trace away from SW and keep it short (<5mm); place VCC capacitor directly between VCC and GND pins with shortest possible connections.
MP2315SGJ-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):
- 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-P FAQ
1.How can I place an order for MP2315SGJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2315SGJ-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 MP2315SGJ-P reliable?
The price and inventory of MP2315SGJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2315SGJ-P is usually 5 days.
3.What payment methods are accepted for MP2315SGJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2315SGJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2315SGJ-P?
MP2315SGJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2315SGJ-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 MP2315SGJ-P?
For technical support, including MP2315SGJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2315SGJ-P requirements.
6.How does Aetrix verify that MP2315SGJ-P is sourced from the original manufacturer or authorized distributors?
All MP2315SGJ-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 MP2315SGJ-P meets industry standards.
7.What is the process for return or replacement of MP2315SGJ-P?
All MP2315SGJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2315SGJ-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 MP2315SGJ-P part is unused and in its original packaging.
Return procedure for MP2315SGJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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