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Monolithic Power Systems Inc. MP2315GJ-Z
- Part No.:
- MP2315GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2315GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:16,038
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Product details
Overview
MP2315GJ-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC delivering 3A continuous output current with internal 90mΩ/40mΩ MOSFETs, fixed 500kHz switching frequency, and 4.5V–24V input range. It operates in current-mode control with AAM power-save mode and integrates thermal shutdown, OCP hiccup, and internal soft-start - deployed in compact notebook I/O power rails.
For engineers reviewing the MP2315GJ-Z datasheet, MP2315GJ-Z pinout, MP2315GJ-Z application, or MP2315GJ-Z equivalent, key selection criteria include its TSOT23-8 package footprint, 0.8V feedback reference, EN/SYNC dual-function pin, BST bootstrap requirement, and AAM resistor-based light-load mode transition.
Technical Context
The MP2315GJ-Z uses peak-current-mode control with a fixed 500kHz oscillator and supports external synchronization from 200kHz to 2MHz via the EN/SYNC pin. Its internal error amplifier compares FB voltage against a 0.791V typical reference (779–803mV) and drives COMP to regulate high-side MOSFET conduction time.
AAM modulation enables pulse-frequency operation below ~100mA load by blocking internal clock cycles when VCOMP < VAAM, while synchronous rectification maintains >90% efficiency across 0.5–3A at 5V output. Bootstrap charging via BST–SW capacitor sustains high-side gate drive under high duty-cycle conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports 5V, 12V, 19V, and 24V intermediate bus rails without external LDO pre-regulation. |
| Output Current | 3A continuous - sustained with proper PCB copper area and thermal vias per TSOT23-8 θJA = 100°C/W spec. |
| Switching Frequency | Fixed 500kHz (±120kHz) - balances EMI, inductor size, and efficiency; sync-capable up to 2MHz for noise-sensitive systems. |
| Feedback Reference | 791mV typical (779–803mV) - sets output voltage via external resistor divider; enables 0.8V–VIN×D output range. |
| Internal MOSFET Rds(on) | HS: 90mΩ / LS: 40mΩ - reduces conduction loss at full load; enables >92% efficiency at 12V→5V/2A on 2-layer PCB. |
| Quiescent Current | 180μA typical - minimizes standby power in always-on subsystems such as USB-C PD controllers or display logic. |
| Protection Features | OCP hiccup, thermal shutdown (150°C), UVLO (3.9V rising), and AAM-controlled light-load PFM - ensures robust fault recovery without external circuitry. |
Pinout & Package
MP2315GJ-Z is housed in an 8-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for space-constrained portable power rails. The exposed pad is not electrically connected but aids thermal dissipation when soldered to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AAM | Advanced Asynchronous Modulation control | Resistor-to-GND sets AAM threshold voltage (~6.2μA sink); determines CCM-to-PFM transition point for light-load efficiency/stability trade-off. |
| 2 IN | Main input supply | Accepts 4.5–24V; requires local 22μF ceramic decoupling; wide trace routing essential to minimize VIN loop inductance. |
| 3 SW | Power switch node | Drives external inductor; high di/dt node - must be short, wide, and isolated from analog traces (FB, AAM). |
| 4 GND | System ground reference | Return path for output, feedback, and internal regulator; requires low-impedance connection to power plane with multiple vias. |
| 5 BST | Bootstrap supply for HS gate driver | Requires 0.1–1μF capacitor between BST and SW; enables high-side MOSFET turn-on above VIN; external diode recommended for >65% duty cycle. |
| 6 EN/SYNC | Enable input / external clock sync | Logic-high (>1.4V) enables regulation; external 200kHz–2MHz clock applied here overrides internal oscillator with sub-2μs setup/hold timing. |
| 7 VCC | Bias supply output | Regulated ~4.9V output; powers internal circuitry; requires 0.1–0.22μF ceramic decoupling close to pin; max 0.22μF capacitance specified. |
| 8 FB | Feedback input | Compares output voltage divider ratio against 0.791V reference; short trace routing critical to avoid noise-induced instability or overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AAM Power-Save Mode | Enables discontinuous conduction (PFM) below ~100mA via programmable AAM pin; improves light-load efficiency to >85% at 10mA without external components. |
| Integrated High/Low-Side MOSFETs | 90mΩ HS + 40mΩ LS Rds(on) eliminates external FETs and drivers - reduces BOM count and layout complexity for 3A buck designs. |
| Internal Soft-Start | 1.5ms typical ramp time (0.8–1.5ms) - prevents output overshoot during startup; no external capacitor required. |
| Current-Mode Control | Provides inherent cycle-by-cycle overcurrent protection and fast transient response (<10μs) to load steps without external compensation. |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C junction temperature; restarts at ~130°C - protects against sustained overload or poor heatsinking in sealed enclosures. |
Applications
| Notebook I/O Power Rail | Digital Set-Top Box SoC Core Supply |
|---|---|
|
Use Scenario: Powers USB controller, PCIe switch, or SATA bridge ICs requiring stable 3.3V/5V at ≤3A in ultra-thin laptop chassis. IC Role / Device Role / Timing Role: Primary synchronous buck regulator; replaces discrete controller+MOSFET solutions with integrated power stage and AAM for battery-aware efficiency. Use Value: Reduces solution size by 40% vs. controller+FET combo; achieves >90% efficiency at 2A while maintaining <20mV output ripple under dynamic load. |
Use Scenario: Supplies 1.2V/1.8V core voltage to ARM-based media processors in low-cost STB platforms with tight thermal budgets. IC Role / Device Role / Timing Role: Point-of-load (POL) converter; leverages fixed-frequency current-mode control for predictable EMI profile and fast load-step response. Use Value: Delivers 3A at 1.2V with <1% line/load regulation; internal soft-start prevents SoC brownout during cold boot sequences. |
| Flat Panel Monitor Logic Supply | Industrial Display Controller Power |
|
Use Scenario: Generates 5V/3.3V for timing controller (TCON), LVDS transmitter, and backlight MCU in 24-inch LCD monitors. IC Role / Device Role / Timing Role: Secondary buck regulator downstream of main 12V rail; uses EN/SYNC pin to align switching with display frame rate for EMI reduction. Use Value: Synchronization to 60Hz frame clock lowers conducted emissions in CISPR-22 Class B test; AAM extends standby time during screen-off periods. |
Use Scenario: Powers FPGA configuration circuitry and interface transceivers in ruggedized HMI panels operating from 24V industrial bus. IC Role / Device Role / Timing Role: Input-rail tolerant buck converter; withstands 24V ±10% variation and 40V transients via internal UVLO and thermal protection. Use Value: Maintains regulation during brownouts (down to 4.5V); hiccup-mode OCP prevents latch-up during cable short events in field-deployed units. |
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 |
|---|---|---|---|
| MP2393GJ-Z | Successor device with improved 95% peak efficiency, lower 60mΩ/30mΩ Rds(on), and extended 4.2–30V input range. | Supports higher input voltages (e.g., 28V PoE++ systems) and delivers 4A continuous current; pin-compatible but requires updated layout for enhanced thermal performance. | Select MP2393GJ-Z for new designs targeting >93% efficiency at 3A or 24V input; MP2315GJ-Z remains viable for cost-sensitive legacy refreshes within 24V limit. |
| TPS563201DDFR | Texas Instruments part with 4.5–18V input, 3A rating, 500kHz fixed frequency, and 0.8V reference - but lacks AAM and sync capability. | Requires external compensation and has no light-load PFM mode; quiescent current is 240μA vs. MP2315's 180μA, reducing battery runtime in portable use. | Choose TPS563201DDFR only if TI ecosystem alignment or automotive qualification (AEC-Q100 Grade 2) is mandatory; otherwise MP2315GJ-Z offers superior feature integration. |
Compared with MP2315GJ-Z, MP2393GJ-Z delivers higher efficiency and wider input range in the same TSOT23-8 footprint, while TPS563201DDFR trades advanced features for TI-specific support - making MP2315GJ-Z optimal for compact, cost-efficient 24V-input consumer electronics where AAM and sync are design-critical.
Availability
MP2315GJ-Z is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box SoC supplies, and flat panel monitor logic rails requiring stable component supply with full lifecycle support.
Supply support for MP2315GJ-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 MP2315 belongs to MPS's high-density synchronous buck converter product line, engineered for space-constrained consumer and computing applications where integration, efficiency, and thermal performance are prioritized over ultra-low quiescent current.
FAQ
What is the maximum recommended output current for MP2315GJ-Z in a standard 2-layer PCB layout?
The MP2315GJ-Z delivers 3A continuous output current under TA = 25°C with adequate copper area (≥200mm² top/bottom GND planes) and ≥6 thermal vias under the exposed pad. At 60°C ambient, derating to 2.2A is advised per θJA = 100°C/W and thermal shutdown at 150°C junction temperature.
Can MP2315GJ-Z operate with an input voltage below 4.5V?
No - the absolute minimum operating input voltage is 4.5V, enforced by internal UVLO with 3.9V rising threshold and 550mV hysteresis. Below this, the IC remains disabled; applying 4.2V will not initiate regulation, and 3.7V is the guaranteed turn-off point per datasheet specifications.
How does the AAM pin affect light-load efficiency and stability?
The AAM pin sets the COMP voltage threshold that triggers PFM mode: lower AAM voltage improves stability and reduces output ripple but degrades light-load efficiency and transient response; higher AAM improves efficiency and transient behavior at the cost of increased ripple. Optimal value is typically 0.4–0.6V for 5V output, set via 65–100kΩ resistor to GND.
Is an external bootstrap diode required for MP2315GJ-Z?
An external bootstrap diode (e.g., 1N4148) from VCC to BST is recommended only when duty cycle exceeds 65% - i.e., for VOUT ≥ 5V with VIN ≤ 7.7V or VOUT = 3.3V with VIN ≤ 5.1V. It improves high-side gate drive efficiency and reduces BST capacitor stress but is optional for most 12V→5V or 19V→5V applications.
What is the purpose of the frequency fold-back feature triggered by low FB voltage?
When FB drops below 400mV (e.g., during output short-circuit), the oscillator frequency folds back to ~250kHz (0.5×fSW) to reduce switching losses and limit average short-circuit current. This works in tandem with hiccup-mode OCP to maintain safe thermal operation during sustained faults without requiring external current-limit circuitry.
Does MP2315GJ-Z support forced PWM (FPWM) mode?
No - MP2315GJ-Z does not offer a dedicated FPWM pin or register control. It operates exclusively in automatic PFM (via AAM) or CCM (when AAM pin is pulled high to VCC). For true FPWM, designers must select alternatives like MP2338 or MPQ2338 with dedicated MODE pin.
What is the minimum output voltage achievable with MP2315GJ-Z?
The minimum regulated output voltage is 0.8V, set by the internal feedback reference. Output voltages below 0.8V are not supported - attempting to set VOUT < 0.8V via resistor divider causes regulation failure, as the error amplifier cannot drive COMP low enough to sustain duty cycle.
MP2315GJ-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:
- Not For New Designs
- 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
MP2315GJ-Z FAQ
1.How can I place an order for MP2315GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2315GJ-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 MP2315GJ-Z reliable?
The price and inventory of MP2315GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2315GJ-Z is usually 5 days.
3.What payment methods are accepted for MP2315GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2315GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2315GJ-Z?
MP2315GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2315GJ-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 MP2315GJ-Z?
For technical support, including MP2315GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2315GJ-Z requirements.
6.How does Aetrix verify that MP2315GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2315GJ-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 MP2315GJ-Z meets industry standards.
7.What is the process for return or replacement of MP2315GJ-Z?
All MP2315GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2315GJ-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 MP2315GJ-Z part is unused and in its original packaging.
Return procedure for MP2315GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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