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Monolithic Power Systems Inc. MPQ2456GJ-Z
- Part No.:
- MPQ2456GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MPQ2456GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MPQ2456GJ-Z from Monolithic Power Systems is a monolithic 0.5A, 50V, 1.2MHz current-mode step-down DC/DC converter with integrated 1Ω power MOSFET, fixed-frequency operation, and internal soft-start. It delivers regulated output from 0.81V to 0.9×VIN across 4.5–50V input, supports ceramic output capacitors, and targets space-constrained industrial power meters and battery chargers.
For engineers reviewing the MPQ2456GJ-Z datasheet, MPQ2456GJ-Z pinout, MPQ2456GJ-Z application, or MPQ2456GJ-Z equivalent, this page provides verified technical context, validated pin functions, confirmed operating limits (e.g., 165°C thermal shutdown, 3.3V UVLO rising threshold), and real-world design implications for high-input-voltage buck conversion.
Technical Context
The MPQ2456GJ-Z implements peak-current-mode control with slope compensation, enabling fast transient response and stable loop behavior with minimal external components. Its error amplifier compares FB voltage against a precise 0.812V bandgap reference and integrates the difference to regulate output.
It features cycle-by-cycle over-current protection triggered at 1.2A typical current limit, frequency foldback (200kHz) during short-circuit faults, and a 0.6ms internal soft-start to prevent output overshoot. The bootstrap (BST) circuit drives the high-side switch gate above VIN using an external capacitor between BST and SW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports wide-range industrial and automotive inputs without pre-regulation |
| Output Voltage Range | 0.81V to 0.9 × VIN - enables adjustable regulation down to sub-1V rails or high-ratio step-downs |
| Switching Frequency | Fixed 1.2MHz (±25%) - allows compact magnetics and reduces EMI filtering burden |
| Peak Output Current | 0.5A - defines maximum continuous load capability under thermal limits in TSOT23-6 |
| Feedback Reference Voltage | 0.812V (±2.5%) - sets output accuracy via external resistor divider; determines VOUT = 0.812 × (1 + R1/R2) |
| Shutdown Quiescent Current | 0.1μA - enables ultra-low-power system sleep modes without external disconnect |
| Thermal Shutdown Threshold | 165°C - protects die integrity; hysteresis of 20°C ensures reliable recovery after fault clearance |
Pinout & Package
MPQ2456GJ-Z is housed in a thermally enhanced TSOT23-6 package with exposed pad (PGND-connected per layout guide), rated for 220°C/W junction-to-ambient thermal resistance on a 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap supply node | Connects external capacitor to SW to generate floating gate drive voltage for internal high-side MOSFET |
| 2 - GND | Power ground reference | Primary return path for power stage; must be isolated from noisy switching paths (e.g., D1–C1 ground) to avoid instability |
| 3 - FB | Output voltage feedback input | Senses resistor-divider tap; internal 0.812V reference sets regulation point; <250mV triggers frequency foldback |
| 4 - EN | Enable control input | Active-high logic input; 1.35V rising threshold enables operation; sink current ≤100μA allows direct VIN biasing |
| 5 - IN | Main power input | Accepts 4.5–50V unregulated supply; requires local 4.7μF ceramic decoupling to suppress switching transients |
| 6 - SW | Power switch output | Drives external inductor; connects internally to MOSFET drain; forms switching node with external diode/capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1Ω Power MOSFET | Eliminates external high-side switch; reduces BOM count and layout complexity for 0.5A applications |
| Stable with Low-ESR Ceramic Capacitors | Enables use of compact, reliable X5R/X7R MLCCs instead of bulkier electrolytics for output filtering |
| 0.6ms Internal Soft-Start | Prevents output overshoot during startup; avoids inrush-induced stress on downstream loads and capacitors |
| Cycle-by-Cycle Over-Current Protection | Responds within one switching cycle to overloads or shorts; prevents MOSFET failure without external sensing |
| Wide Input Range (4.5–50V) | Supports direct connection to 12V/24V/48V industrial buses and battery systems without intermediate regulation |
Applications
| Power Meters | Battery Chargers |
|---|---|
|
Use Scenario: Metering ICs and RF modules in smart electricity meters require clean, isolated 3.3V or 5V rails from 48V PLC or 24V backup batteries. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator supplying microcontroller, ADC, and communication ICs. Use Value: 50V max input withstands surge events on utility-side power; 1.2MHz switching minimizes filter size in sealed meter enclosures. |
Use Scenario: On-board charging circuits for 12V lead-acid or LiFePO₄ batteries in solar generators or portable tools. IC Role / Device Role / Timing Role: Pre-regulator stepping down variable PV or adapter input (e.g., 18–42V) to fixed 14.4V charge voltage. Use Value: Adjustable output (via FB divider) enables precise charge voltage tuning; thermal shutdown prevents damage during prolonged float charging. |
| Distributed Power Systems | WLED Drivers |
|
Use Scenario: Point-of-load conversion in industrial controllers where 24V or 48V backplane supplies multiple 5V/3.3V subsystems. IC Role / Device Role / Timing Role: Local DC/DC converter delivering regulated rail to FPGA I/O banks or sensor interfaces. Use Value: TSOT23-6 footprint saves board area; 0.1μA shutdown current extends standby time in low-power monitoring nodes. |
Use Scenario: Constant-current LED drivers for white LED strings in emergency lighting or signage powered from 12–36V sources. IC Role / Device Role / Timing Role: Voltage-regulated source feeding external constant-current sink (e.g., LM3409 or discrete op-amp circuit). Use Value: High efficiency (>90% at 500mA) reduces thermal load near LEDs; frequency foldback prevents runaway during open-circuit LED faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Same 0.5A/50V rating but 2MHz switching; no internal soft-start; requires external bootstrap diode | Better suited for ultra-compact designs needing smaller inductors; less tolerant of large output caps at startup | Select when board area is critical and startup sequencing is controlled externally |
| LMR14006XDDAR | TI part: 60V input, 0.6A, 1.5MHz, integrated compensation; higher quiescent current (40μA) | Offers better light-load efficiency via Eco-mode; wider temp range (–40°C to +150°C) | Prefer when extended temperature operation or adaptive frequency modulation is required |
Compared with MPQ2456GJ-Z, MP2451DT-LF-Z trades startup robustness for higher frequency miniaturization, while LMR14006XDDAR adds Eco-mode efficiency at the cost of higher static current and different compensation architecture-making MPQ2456GJ-Z optimal for cost-sensitive, thermally constrained 1.2MHz designs with large-output-capacitor startup.
Availability
MPQ2456GJ-Z is available at Aetrix Electronics and suitable for power meters, battery chargers, distributed power systems, and WLED drivers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MPQ2456GJ-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MPQ2456 belongs to MPS's high-voltage buck converter product line, designed specifically for industrial and energy infrastructure applications demanding wide-input-voltage operation, small footprint, and robust fault protection.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MPQ2456GJ-Z is stable with low-ESR ceramic capacitors ≥10µF. Typical designs use 22µF X5R/X7R MLCCs; smaller values (e.g., 10µF) are acceptable if output ripple and transient response remain within spec. Avoid tantalum or aluminum electrolytics due to ESR-related instability.
Can the MPQ2456GJ-Z operate with an input voltage below 4.5V?
No. The absolute minimum operating input is 4.5V per datasheet specifications. Below this, UVLO prevents startup; the rising threshold is 2.9–3.7V, but functional operation only begins above 4.5V. For sub-4.5V inputs, consider the MPQ2452 (2.5–36V range) or MP2451 (3.3–36V).
Is an external bootstrap diode required?
An external bootstrap diode (e.g., 1N4148) is optional and recommended only when duty cycle exceeds 65% (e.g., VOUT ≥ 5V with VIN > 12V) to improve gate drive margin and efficiency. The internal bootstrap circuit functions reliably without it in most 3.3V/5V applications.
How does the frequency foldback feature behave during overload?
When FB voltage drops below 250mV (indicating severe overload or short circuit), the oscillator frequency reduces from 1.2MHz to 200kHz. This lowers peak switch current and thermal stress while maintaining regulation attempt-distinct from full shutdown, allowing automatic recovery once fault clears.
What is the maximum allowable PCB copper area connected to the exposed pad?
The TSOT23-6 exposed pad (connected to GND) may be soldered to unlimited GND copper area. Larger thermal pads significantly reduce θJA-MPS recommends ≥100mm² for optimal thermal performance. Do not isolate the pad; ensure solid solder joint and thermal via stitching to inner GND planes.
Does the MPQ2456GJ-Z support synchronization to an external clock?
No. The MPQ2456GJ-Z uses a fixed internal 1.2MHz oscillator with no SYNC pin or frequency adjustment interface. For synchronizable alternatives, consider the MPQ4470-AEC1 (with SYNC input) or MP2459 (external resistor-programmable frequency).
MPQ2456GJ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 50V
- Voltage - Output (Min/Fixed):
- 0.81V
- Voltage - Output (Max):
- 45V
- Current - Output:
- 500mA
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MPQ2456GJ-Z FAQ
1.How can I place an order for MPQ2456GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2456GJ-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 MPQ2456GJ-Z reliable?
The price and inventory of MPQ2456GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2456GJ-Z is usually 5 days.
3.What payment methods are accepted for MPQ2456GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2456GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2456GJ-Z?
MPQ2456GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2456GJ-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 MPQ2456GJ-Z?
For technical support, including MPQ2456GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2456GJ-Z requirements.
6.How does Aetrix verify that MPQ2456GJ-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2456GJ-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 MPQ2456GJ-Z meets industry standards.
7.What is the process for return or replacement of MPQ2456GJ-Z?
All MPQ2456GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2456GJ-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 MPQ2456GJ-Z part is unused and in its original packaging.
Return procedure for MPQ2456GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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