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Monolithic Power Systems Inc. MP2459GJ-Z
- Part No.:
- MP2459GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP2459GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,487
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Product details
Overview
MP2459GJ-Z from Monolithic Power Systems is a monolithic 0.5A, 55V input, 480kHz current-mode step-down DC/DC converter with integrated 1Ω power MOSFET in TSOT23-6 package. It delivers regulated output voltage adjustable from 0.81V to 0.95×VIN, features cycle-by-cycle over-current protection and thermal shutdown, and is used in battery chargers, power meters, and pre-regulators for linear regulators.
For engineers reviewing the MP2459GJ-Z datasheet, MP2459GJ-Z pinout, MP2459GJ-Z application, or MP2459GJ-Z equivalent, key selection criteria include its 4.5–55V wide input range, 0.1μA shutdown current, fixed 480kHz switching frequency, 0.812V feedback reference, and TSOT23-6 thermal performance (θJA = 220°C/W).
Technical Context
The MP2459GJ-Z implements peak current-mode control with internal slope compensation, enabling fast transient response and stable loop behavior without external compensation. Its error amplifier compares FB voltage against a precise 0.812V bandgap reference and integrates the error to adjust peak inductor current.
Operation relies on a bootstrap circuit (BST–SW) to drive the high-side MOSFET gate above VIN, supporting duty cycles up to 93.5%. Fault management includes cycle-by-cycle current limiting triggered at 1.25A typical, and thermal shutdown activation at 165°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports industrial and automotive battery-fed systems including 12V, 24V, and 48V rails. |
| Output Current | 0.5A peak - sufficient for low-power microcontrollers, sensors, and WLED biasing in space-constrained designs. |
| Switching Frequency | Fixed 480kHz - enables compact magnetics (e.g., 15–22μH inductors) and predictable EMI filtering design. |
| Feedback Reference | 0.812V ±20mV - sets output accuracy; allows resistor-divider programming of VOUT from 0.81V to 0.95×VIN. |
| Internal MOSFET RDS(ON) | 1Ω - limits conduction loss at 0.5A, contributing to up to 90% efficiency at mid-load in typical 12V→5V conversion. |
| Shutdown Current | 0.1μA - enables ultra-low-power system sleep modes without compromising wake-up responsiveness. |
| UVLO Threshold | Rising: 3.3V ±0.4V - prevents erratic startup during brown-out; hysteresis of 250mV ensures clean enable/disable transitions. |
Pinout & Package
MP2459GJ-Z is housed in a thermally enhanced TSOT23-6 package (JEDEC MO-193 AB), featuring an exposed pad for improved heat dissipation. The 6-pin layout supports minimal external component count and high-density PCB placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap supply node | Connects external capacitor between BST and SW to generate gate-drive voltage >VIN for internal high-side MOSFET. |
| 2 - GND | Power and signal ground reference | Low-impedance return path for feedback, control, and switching currents; requires dedicated copper pour and separation from power ground loops. |
| 3 - FB | Output voltage feedback input | Senses resistor-divider output; internal 0.812V reference enables precise regulation; folds back frequency below 250mV to limit fault current. |
| 4 - EN | Enable control input | Logic-level ON/OFF control: active-high with 1.35V rising threshold; 0.1μA input current enables direct MCU GPIO or RC auto-start interface. |
| 5 - IN | Main power input | Accepts 4.5–55V unregulated supply; requires local 4.7μF ceramic decoupling to suppress switching transients and stabilize input impedance. |
| 6 - SW | Switch node output | Drives external Schottky diode and inductor; carries high di/dt; must be routed short and away from analog traces (e.g., FB) to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1Ω power MOSFET | Eliminates external high-side switch, reducing BOM count and PCB area while maintaining 0.5A capability at 55V input. |
| Stable with ceramic output capacitors | Supports low-ESR X5R/X7R 22μF ceramics-no electrolytic or tantalum required-improving reliability and temperature stability. |
| Current-mode control with slope compensation | Enables single-loop stability across full load and line ranges without external compensation components. |
| Frequency foldback under short-circuit | Reduces switching frequency to ~150kHz when FB < 250mV, limiting average inductor current and thermal stress during output faults. |
| Thermal shutdown with hysteresis | Shuts down at 165°C and resumes only after cooling to 145°C, preventing thermal cycling and ensuring safe recovery from overload. |
Applications
| Power Meters | Battery Chargers |
|---|---|
|
Use Scenario: Metering ICs and RF modules in smart electricity meters powered from 12–48V distribution lines. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting raw utility-derived DC to stable 3.3V or 5V for metrology SoCs and wireless transceivers. Use Value: Wide 4.5–55V input accommodates fluctuating meter supply rails; 0.1μA shutdown enables long-term battery backup operation. |
Use Scenario: On-board charging circuits for 2–4 cell Li-ion/LiFePO₄ packs in portable tools and medical devices. IC Role / Device Role / Timing Role: Constant-voltage pre-regulator feeding linear charger ICs or managing CC/CV stages via FB voltage modulation. Use Value: Adjustable output (0.81V–0.95×VIN) supports diverse battery chemistries; cycle-by-cycle OCP protects against cell imbalance faults. |
| Distributed Power Systems | WLED Drivers |
|
Use Scenario: Point-of-load conversion in industrial PLCs or telecom line cards where 24V or 48V backplanes feed multiple sub-systems. IC Role / Device Role / Timing Role: Compact, self-contained buck stage delivering isolated 3.3V/5V rails to FPGA I/O banks, ADCs, and interface logic. Use Value: TSOT23-6 footprint saves board space; 480kHz switching allows small 15μH inductors and reduces filter size versus lower-frequency alternatives. |
Use Scenario: Constant-current LED biasing in automotive interior lighting or industrial status indicators using series-connected WLED strings. IC Role / Device Role / Timing Role: Regulated voltage source for external constant-current LED driver ICs or resistor-based current-setting topologies. Use Value: High 55V input withstands load-dump transients; thermal shutdown prevents LED thermal runaway during ambient temperature excursions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451GJ-Z | Lower 36V max input, 0.6A output, same TSOT23-6 package and 480kHz frequency. | Optimized for 12V/24V systems only; lacks 55V robustness for industrial transients or battery float voltages. | Select when input never exceeds 36V and higher output current margin is needed. |
| LMR36506RNXR | Texas Instruments part: 65V input, 0.6A, 2.1MHz switching, different pinout (6-pin WSON), no BST pin. | Requires external high-side FET drive; higher frequency enables smaller inductors but increases EMI filtering complexity. | Choose for ultra-compact designs needing >2MHz operation and TI ecosystem support. |
Compared with MP2451GJ-Z, the MP2459GJ-Z provides 19V higher input rating critical for 48V battery systems; versus LMR36506RNXR, it offers simpler bootstrap-based gate drive and proven 480kHz EMI profile, though at lower switching frequency.
Availability
MP2459GJ-Z is available at Aetrix Electronics and suitable for power meters, battery chargers, and distributed power systems requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2459GJ-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 design centers in the US, China, and Taiwan.
The MP2459 belongs to MPS's high-voltage buck converter product line, engineered for rugged industrial and energy infrastructure applications where wide input range, thermal resilience, and minimal external components are essential.
FAQ
What is the minimum recommended output capacitor value for stable operation?
The MP2459GJ-Z is stable with low-ESR ceramic capacitors; a 22μF X5R or X7R type is recommended for most applications. Smaller values (e.g., 10μF) may be used with careful loop compensation, but 22μF ensures adequate ripple suppression and phase margin across temperature and load variations.
Can the MP2459GJ-Z operate without an external bootstrap capacitor?
No - the BST pin requires a capacitor (0.1μF to 1μF) connected between BST and SW to generate the gate-drive voltage for the internal high-side MOSFET. Omitting this capacitor prevents proper switch turn-on and causes immediate functional failure.
Does the MP2459GJ-Z support adjustable soft-start?
No - the MP2459GJ-Z does not integrate programmable soft-start. Output voltage rise time is determined by the feedback divider's RC time constant and load capacitance; external soft-start can be implemented via controlled EN ramping or FB pin capacitance.
What is the maximum achievable duty cycle, and how does it affect minimum output voltage?
The MP2459GJ-Z supports up to 93.5% duty cycle. With a 4.5V minimum input, this allows a theoretical minimum VOUT of ~0.81V (per FB reference), but practical minimum is constrained by dropout and ripple - confirmed minimum regulated output is 0.81V across full load and temperature range.
Is an external Schottky diode mandatory, and what specifications are required?
Yes - the MP2459GJ-Z uses external asynchronous rectification. A Schottky diode with ≤0.5V forward voltage, ≥1A average current rating, and fast recovery (<50ns) is required. Recommended types include SS34 or MBR0530; reverse voltage rating must exceed VIN (e.g., 60V min for 55V operation).
How does frequency foldback improve short-circuit protection?
When FB voltage drops below 250mV (indicating severe overload or short), the oscillator frequency reduces from 480kHz to ~150kHz. This lowers average inductor current and power dissipation, preventing thermal runaway while maintaining detectable switching activity for fault diagnostics.
What PCB layout practices are critical for thermal performance?
Maximize copper area connected to the exposed pad (Pin 2 GND) and IN/SW pins; use ≥2 internal ground planes; keep high-current paths (IN→SW→D1→GND) short and wide; isolate FB trace from SW and inductor fields; and avoid thermal reliefs on GND pad connections.
MP2459GJ-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):
- 55V
- Voltage - Output (Min/Fixed):
- 0.81V
- Voltage - Output (Max):
- 52.25V
- Current - Output:
- 500mA
- Frequency - Switching:
- 480kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MP2459GJ-Z FAQ
1.How can I place an order for MP2459GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2459GJ-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 MP2459GJ-Z reliable?
The price and inventory of MP2459GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2459GJ-Z is usually 5 days.
3.What payment methods are accepted for MP2459GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2459GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2459GJ-Z?
MP2459GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2459GJ-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 MP2459GJ-Z?
For technical support, including MP2459GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2459GJ-Z requirements.
6.How does Aetrix verify that MP2459GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2459GJ-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 MP2459GJ-Z meets industry standards.
7.What is the process for return or replacement of MP2459GJ-Z?
All MP2459GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2459GJ-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 MP2459GJ-Z part is unused and in its original packaging.
Return procedure for MP2459GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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