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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MPQ2315GJ-Z

Name: MPQ2315GJ-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ2315GJ-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ2315GJ-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-8 Thin, TSOT-23-8

Datasheet:: MPQ2315GJ-Z.pdf

Description:: IC REG BUCK ADJ 3A TSOT23-8

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Product details

Overview

MPQ2315GJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 120mΩ/50mΩ high- and low-side MOSFETs, delivering 3A continuous output current across 4.5V–24V input range, fixed 500kHz switching frequency, and adjustable 0.8V–VIN output voltage - deployed in notebook I/O power and flat-panel display power rails.

For engineers reviewing the MPQ2315GJ-Z datasheet, MPQ2315GJ-Z pinout, MPQ2315GJ-Z application, or MPQ2315GJ-Z equivalent, key selection criteria include AAM light-load efficiency mode, EN/SYNC dual-function pin for enable/synchronization (200kHz–2MHz), thermal shutdown at 150°C, 8-pin TSOT23 package footprint, and internal soft-start (1.5ms typical).

Technical Context

The MPQ2315GJ-Z employs peak-current-mode control with internal 0.8V reference and optimized compensation, enabling fast transient response and stable loop behavior without external compensation components. Its AAM (Advanced Asynchronous Modulation) logic dynamically transitions between PFM and CCM based on V_COMP vs. externally set AAM voltage.

It integrates a floating bootstrap driver for the high-side MOSFET, requiring an external BST capacitor and optional diode for >65% duty cycles. UVLO thresholds are 3.9V (rising) and 3.25V (falling), referenced to internal VCC regulator output, not VIN directly.

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	3A continuous - sufficient for powering core logic, DDR memory termination, or display backlight drivers.
Switching Frequency	Fixed 500kHz (±220kHz variation) - balances EMI performance and inductor size; sync-capable up to 2MHz.
Feedback Voltage	0.791V typical (0.775V–0.807V) - sets output accuracy; enables precise 1.05V–5V regulation via resistor divider.
R_DS(on) (HS/LS)	120mΩ / 50mΩ - minimizes conduction loss at full load, supporting >90% efficiency at mid-load conditions.
Thermal Shutdown	150°C with 20°C hysteresis - protects die during overload or poor PCB thermal design; resumes at ~130°C.
AAM Mode Threshold	Externally set via resistor to GND (6.2μA current source) - determines light-load PFM entry point for ripple/efficiency trade-off.

Pinout & Package

MPQ2315GJ-Z is housed in an 8-pin TSOT23 package (3.0mm × 3.0mm × 0.9mm), optimized for high-density PCB layouts with exposed thermal pad (not electrically connected). Pin 1 is bottom-left when viewing top marking left-to-right.

Pin/Terminal	Circuit Role	Design Meaning
1 AAM	Advanced Asynchronous Modulation control	Resistor-to-GND sets transition voltage between PFM and CCM; tie to VCC to force CCM operation.
2 IN	Main input supply connection	Accepts 4.5V–24V; requires local 22μF ceramic decoupling; wide trace recommended for high di/dt paths.
3 SW	Switch node	Drives external inductor; high dv/dt node - must be routed short and away from FB/EN analog traces.
4 GND	Power and signal ground reference	Primary return path for HS/LS MOSFETs and feedback network; connect to thermal pad and ground plane with multiple vias.
5 BST	Bootstrap supply for high-side driver	Requires 0.1–1μF capacitor between BST and SW; external diode recommended for VOUT ≥ 3.3V and D > 65%.
6 EN/SYNC	Enable and external clock synchronization	Logic-high (>1.25V) enables regulator; AC-coupled external clock (200kHz–2MHz) synchronizes switching edge.
7 VCC	Bias supply output	Internally regulated ~5V (4.6–5.15V); powers internal circuitry; decouple with 0.1–0.22μF ceramic cap.
8 FB	Output voltage feedback input	Compares divided output against 0.8V reference; foldback activates below 400mV during short-circuit events.

Key Features

Feature	Design Value
Integrated Power Stage	120mΩ HS + 50mΩ LS MOSFETs eliminate external switch count and gate-drive complexity.
AAM Light-Load Efficiency	PFM mode reduces quiescent current to 130–240μA, extending battery runtime in portable systems.
Internal Soft-Start	1.5ms typical ramp prevents output overshoot and inrush current during power-up sequences.
Robust Protection Suite	Cycle-by-cycle OCP with hiccup recovery, thermal shutdown (150°C), and UVLO (3.9V/3.25V) ensure system reliability.
Sync-Capable Oscillator	EN pin accepts external clock (200kHz–2MHz) to eliminate beat frequencies in multi-rail systems.

Applications

Notebook I/O Power

Digital Set-Top Box SoC Core Supply

Use Scenario: Providing clean, regulated 1.2V/1.8V/3.3V rails for USB controllers, PCIe switches, and SATA PHYs in ultrabooks.

IC Role / Device Role / Timing Role: Primary buck regulator with tight line/load regulation and fast transient response to handle burst I/O activity.

Use Value: Eliminates need for external MOSFETs and compensation network, reducing BOM count by ≥4 components per rail.

Use Scenario: Delivering 3A at 1.05V–1.2V to ARM-based media processors in cable/satellite STBs under dynamic video decode loads.

IC Role / Device Role / Timing Role: High-efficiency point-of-load converter synchronized to system clock to suppress conducted EMI.

Use Value: AAM mode maintains >85% efficiency at 10mA standby, meeting Energy Star Tier 2 standby power requirements.

Flat-Panel Monitor Logic Supply

Industrial Human-Machine Interface (HMI) Display Backlight Driver Support

Use Scenario: Generating 5V/3.3V for timing controllers (TCON), LVDS transmitters, and microcontroller subsystems in 24-inch LCD monitors.

IC Role / Device Role / Timing Role: Main system power IC with EN/SYNC pin tied to panel controller's clock to reduce radiated emissions.

Use Value: Fixed 500kHz operation allows predictable filter design; TSOT23-8 footprint fits narrow bezel PCB space constraints.

Use Scenario: Supplying stable 5V bias for LED driver ICs (e.g., MPQ3362) in factory-floor HMIs operating in -40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Robust intermediate rail generator with thermal shutdown and hiccup-mode OCP for unattended operation.

Use Value: 150°C thermal shutdown and -40°C to +125°C junction rating ensure reliability in sealed, 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
RT6220AGQW	4.5V–18V input, 3A, 600kHz, no AAM mode, higher IQ (250μA)	Lacks light-load PFM; less suitable for battery-powered displays	Prefer when strict 24V input support is unnecessary and cost is primary constraint.
TPS563201	4.5V–17V input, 3A, 500kHz, integrated compensation, no SYNC pin	No external clock synchronization; limited to standalone operation	Select when board-level EMI control via frequency sync is not required and layout simplicity is prioritized.

Compared with RT6220AGQW and TPS563201, MPQ2315GJ-Z uniquely supports 24V input, AAM for ultra-low-I_Q, and EN/SYNC dual functionality - making it optimal for space-constrained, multi-rail, and wide-input industrial displays.

Availability

MPQ2315GJ-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, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MPQ2315GJ-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 operations.

The MPQ2315 belongs to MPS's high-efficiency synchronous buck converter product line, designed specifically for compact, high-current point-of-load applications in portable and display electronics where thermal density and light-load efficiency are critical.

FAQ

What is the minimum recommended input capacitance for MPQ2315GJ-Z?

A 22μF X5R/X7R ceramic capacitor is recommended at the IN pin, placed as close as possible with short, wide traces. This value meets RMS current and voltage ripple requirements for 3A loads across the 4.5V–24V input range, and provides adequate charge reservoir during high-frequency switching transitions.

Can MPQ2315GJ-Z operate with an output voltage lower than 0.8V?

No - the internal reference is fixed at 0.8V, and the FB pin is designed to regulate precisely to that threshold. Output voltages below 0.8V are not supported; attempting to set V_OUT < 0.8V results in regulation failure and potential instability due to comparator saturation.

How does the AAM pin affect light-load efficiency and output ripple?

A lower AAM voltage (via larger R_AAM) increases PFM mode duration, improving light-load efficiency but increasing output voltage ripple and degrading transient response. A higher AAM voltage extends CCM operation, reducing ripple but raising quiescent current - optimal value is determined empirically per application load profile.

Is an external bootstrap diode required for all designs?

An external bootstrap diode (e.g., 1N4148) from VCC to BST is recommended only when V_OUT ≥ 3.3V and duty cycle > 65% (i.e., V_IN/V_OUT > 1.52). It improves BST capacitor charging efficiency and reduces power loss in the internal bootstrap path.

What is the maximum allowable output capacitor ESR for stable operation?

The MPQ2315GJ-Z supports a wide range of output capacitor ESR values due to its internally optimized compensation. For ceramic capacitors (dominant capacitive impedance), stability is maintained with ESR < 10mΩ; for tantalum/electrolytic (ESR-dominant), stability holds up to 100mΩ, provided total phase margin exceeds 45°.

Does MPQ2315GJ-Z support forced PWM mode?

No - MPQ2315GJ-Z does not offer a dedicated forced-PWM pin or register setting. CCM operation can be enforced by driving the AAM pin to VCC, but this disables light-load efficiency optimization and increases no-load current to ~240μA.

What PCB layout practices are critical for thermal performance?

Thermal performance depends on connecting the exposed thermal pad (under package) to a large internal/external copper pour using ≥4 thermal vias (0.3mm diameter), minimizing θ_JA. Also, keep IN-GND and SW-GND loops small, place input/output caps within 3mm of respective pins, and avoid routing sensitive analog traces near SW or BST nodes.

MPQ2315GJ-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

MPQ2315GJ-Z FAQ

1.How can I place an order for MPQ2315GJ-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ2315GJ-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 MPQ2315GJ-Z reliable?

The price and inventory of MPQ2315GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2315GJ-Z is usually 5 days.

3.What payment methods are accepted for MPQ2315GJ-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2315GJ-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ2315GJ-Z?

MPQ2315GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ2315GJ-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 MPQ2315GJ-Z?

For technical support, including MPQ2315GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2315GJ-Z requirements.

6.How does Aetrix verify that MPQ2315GJ-Z is sourced from the original manufacturer or authorized distributors?

All MPQ2315GJ-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 MPQ2315GJ-Z meets industry standards.

7.What is the process for return or replacement of MPQ2315GJ-Z?

All MPQ2315GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2315GJ-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 MPQ2315GJ-Z part is unused and in its original packaging.

Return procedure for MPQ2315GJ-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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