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Monolithic Power Systems Inc. MPQ2456GJ-P
- Part No.:
- MPQ2456GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MPQ2456GJ-P.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,939
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Product details
Overview
MPQ2456GJ-P from Monolithic Power Systems is a monolithic 0.5A, 50V, 1.2MHz current-mode synchronous step-down DC/DC converter with integrated 1Ω power MOSFET, fixed-frequency operation, and internal compensation - designed for compact industrial and metering power rails requiring wide 4.5–50V input and adjustable 0.81V–0.9×VIN output.
For engineers reviewing the MPQ2456GJ-P datasheet, MPQ2456GJ-P pinout, MPQ2456GJ-P application, or MPQ2456GJ-P equivalent, key selection criteria include its TSOT23-6 thermal performance (θJA = 220°C/W), cycle-by-cycle OCP, 0.1μA shutdown current, bootstrap-driven high-side gate drive, and compatibility with low-ESR ceramic output capacitors in space-constrained designs.
Technical Context
The MPQ2456GJ-P implements peak-current-mode control with slope compensation to ensure stability across duty cycles up to 91%, using an internal 0.812V ±2.5% bandgap reference and error amplifier that integrates FB voltage error. Its oscillator operates at a fixed 1.2MHz (±20%) with foldback to 200kHz under short-circuit fault conditions.
It features a bootstrap-gated N-channel high-side switch requiring external BST capacitor between SW and BST pins, supports automatic soft-start (0.6ms), and includes undervoltage lockout (UVLO) with 3.3V rising threshold and 250mV hysteresis - enabling robust start-up across automotive and industrial input transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports direct connection to 12V/24V/36V/48V industrial buses without pre-regulation |
| Output Voltage Range | 0.81V to 0.9 × VIN - enables adjustable regulation down to sub-1V logic rails or up to 45V pre-bias outputs |
| Switching Frequency | Fixed 1.2MHz (±20%) - allows use of small 10µH inductors and reduces EMI filter size |
| Peak Output Current | 0.5A - delivers sufficient power for auxiliary rails in smart meters and sensor nodes |
| Internal MOSFET RDS(ON) | 1Ω - minimizes conduction loss while maintaining thermal safety in TSOT23-6 package |
| Feedback Reference Voltage | 0.812V ±2.5% - sets output accuracy and defines resistor-divider ratio for precise VOUT setting |
| Shutdown Quiescent Current | 0.1μA - enables ultra-low-power standby in battery-backed or energy-harvesting systems |
Pinout & Package
MPQ2456GJ-P is housed in a thermally enhanced TSOT23-6 package with exposed pad (PGND-connected per layout guide), rated for 0.568W continuous dissipation at +25°C ambient and θJA = 220°C/W on 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap supply node | Connects external 0.1–1µF capacitor to SW to generate floating gate drive voltage for internal high-side MOSFET |
| GND (Pin 2) | Power ground reference | Primary return path for switch current and feedback reference; must be isolated from noisy D1–C1 paths per layout guidelines |
| FB (Pin 3) | Output voltage sensing input | Monitors resistor divider tap; internal 0.812V reference enables precise VOUT programming and triggers foldback below 250mV |
| EN (Pin 4) | Enable control input | Logic-high (>1.35V) enables regulator; 100μA max sink current allows simple resistor-based auto-enable from VIN |
| IN (Pin 5) | Main power input | Accepts 4.5–50V unregulated supply; requires local 4.7µF X5R/X7R ceramic decoupling to suppress switching noise |
| SW (Pin 6) | Switch node output | Drives external Schottky diode and inductor; high dv/dt node requiring tight layout to minimize EMI and ringing |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control with slope compensation | Ensures stable operation across full load and input range without external compensation components |
| Integrated 1Ω high-side MOSFET | Eliminates need for external switch and driver, reducing BOM count and board area in TSOT23-6 footprint |
| 0.6ms internal soft-start | Prevents output overshoot during startup, especially critical when charging large output capacitors (≥2200µF) |
| Cycle-by-cycle over-current protection | Provides immediate current limiting per switching cycle to protect against short-circuit and overload faults |
| Thermal shutdown with 20°C hysteresis | Halts operation at 165°C junction temperature and resumes only after die cools to 145°C, preventing thermal runaway |
Applications
| Power Meters | Distributed Power Systems |
|---|---|
Use Scenario: Metering ICs and RF modules in AMI smart electricity meters require isolated, efficient 3.3V/5V rails from 12–48V PLC or battery inputs. IC Role / Device Role / Timing Role: Primary buck regulator supplying microcontroller, ADC, and communication subsystems with tight line/load regulation. Use Value: Wide 4.5–50V input range accommodates fluctuating PLC bus voltages; 1.2MHz switching enables compact 10µH inductor and low-profile design. | Use Scenario: Point-of-load conversion in telecom or industrial backplanes where multiple distributed 5V/12V rails feed FPGA I/O banks or analog front-ends. IC Role / Device Role / Timing Role: Secondary buck stage stepping down intermediate 12V/24V bus to precise logic or analog supply voltages. Use Value: Adjustable 0.81V–0.9×VIN output supports diverse rail requirements; TSOT23-6 footprint simplifies dense multi-rail layouts. |
| Battery Chargers | WLED Drivers |
Use Scenario: Constant-voltage pre-regulator in multi-cell Li-ion charger circuits, feeding linear or switching charge controllers from variable adapter inputs. IC Role / Device Role / Timing Role: Input-stage buck converter delivering stable intermediate voltage to downstream CC/CV charge management ICs. Use Value: 50V absolute max input withstands 48V adapter surges; 0.1μA shutdown current preserves battery life during storage mode. | Use Scenario: Constant-current LED driver bias supply in automotive interior lighting or industrial status indicators using white LEDs. IC Role / Device Role / Timing Role: Fixed-frequency buck controller regulating current through external sense resistor and series LED string. Use Value: Cycle-by-cycle OCP protects against LED open-circuit failure; frequency foldback prevents thermal stress during short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DJ-LF-Z | Same 0.5A/50V rating but 2MHz switching, no BST pin - uses integrated bootstrap circuitry | Requires smaller inductor (4.7µH) but less tolerant of high-duty-cycle operation above 65% | Preferred for higher-frequency, lower-inductance designs where board space is more constrained than thermal budget |
| LMR14050SDDAR | 50V/0.5A buck with 400kHz–2.5MHz sync capability, higher 2.1A current limit, and integrated BOOT diode | Supports external clock synchronization and offers wider frequency tuning, but larger SO-8 package | Chosen when system-level timing coordination or higher transient current headroom is required |
Compared with MP2451DJ-LF-Z and LMR14050SDDAR, MPQ2456GJ-P provides optimal thermal efficiency in ultra-compact TSOT23-6 form factor with proven reliability in metering and industrial environments, while trading off frequency flexibility for simplicity and cost-effective implementation.
Availability
MPQ2456GJ-P is available at Aetrix Electronics and suitable for power meters, distributed power systems, and battery chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MPQ2456GJ-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MPQ2456 belongs to MPS's industrial-grade buck converter product line, engineered for rugged operation in utility metering, factory automation, and distributed power infrastructure where wide-input, high-reliability, and minimal external component count are critical.
FAQ
What is the minimum recommended output capacitor value for stable operation?
The MPQ2456GJ-P is stable with low-ESR ceramic output capacitors; a minimum of 22µF X5R/X7R is recommended for most applications to ensure loop stability and limit output ripple. Smaller values (e.g., 10µF) may be used with careful compensation but risk instability under light-load conditions.
Does MPQ2456GJ-P require an external bootstrap diode?
An external bootstrap diode (e.g., IN4148) is optional and recommended only when operating at high duty cycles (>65%) - such as with 3.3V or 5V outputs from ≥12V inputs - to improve efficiency by reducing BST capacitor discharge losses. It is not required for standard operation.
Can MPQ2456GJ-P operate with an input voltage below 4.5V?
No - the device has a guaranteed operational input range of 4.5V to 50V. Below 4.5V, UVLO prevents startup; the rising UVLO threshold is 3.3V ±0.4V, but functional regulation begins only above 4.5V per recommended operating conditions.
How does the frequency foldback feature behave during output short-circuit?
When FB voltage drops below 250mV (indicating severe overload or short), the oscillator frequency folds back from 1.2MHz to 200kHz. This reduces switching losses and thermal stress while maintaining current-limit protection, enabling safe hiccup-mode recovery without latch-off.
Is the exposed pad on the TSOT23-6 package electrically connected?
Yes - the exposed pad is internally connected to GND (Pin 2) and must be soldered to a dedicated PGND copper pour for optimal thermal performance and EMI reduction. Layout guidelines specify isolation from noisy high-current return paths to avoid coupling noise into the feedback network.
What is the maximum achievable output voltage accuracy over temperature?
The feedback reference voltage is specified as 0.812V ±2.5% over –40°C to +125°C junction temperature. Combined with 1% resistor tolerance in the divider, total output voltage error remains within ±3.5% across full operating range - sufficient for non-precision auxiliary rails.
Does MPQ2456GJ-P support forced PWM or power-save mode?
No - it operates exclusively in forced continuous conduction mode (CCM) with fixed 1.2MHz frequency. There is no pulse-skipping or discontinuous conduction mode (DCM); light-load efficiency is maintained via low quiescent current (0.85mA typical) rather than frequency modulation.
MPQ2456GJ-P 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-P FAQ
1.How can I place an order for MPQ2456GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2456GJ-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 MPQ2456GJ-P reliable?
The price and inventory of MPQ2456GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2456GJ-P is usually 5 days.
3.What payment methods are accepted for MPQ2456GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2456GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2456GJ-P?
MPQ2456GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2456GJ-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 MPQ2456GJ-P?
For technical support, including MPQ2456GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2456GJ-P requirements.
6.How does Aetrix verify that MPQ2456GJ-P is sourced from the original manufacturer or authorized distributors?
All MPQ2456GJ-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 MPQ2456GJ-P meets industry standards.
7.What is the process for return or replacement of MPQ2456GJ-P?
All MPQ2456GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2456GJ-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 MPQ2456GJ-P part is unused and in its original packaging.
Return procedure for MPQ2456GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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