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Monolithic Power Systems Inc. MP4459DQT-LF-Z
- Part No.:
- MP4459DQT-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MP4459DQT-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,634
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Product details
Overview
MP4459DQT-LF-Z from Monolithic Power Systems is a 1.5A, 4MHz, 36V non-synchronous step-down DC/DC converter with integrated 150mΩ high-side MOSFET, current-mode control, and programmable switching frequency. It delivers regulated output from 0.8V to 30V across a 3.8V–36V input range and supports automotive and industrial power rails requiring low quiescent current (120µA) and EMI-sensitive operation at 4MHz.
For engineers reviewing the MP4459DQT-LF-Z datasheet, MP4459DQT-LF-Z pinout, MP4459DQT-LF-Z application, or MP4459DQT-LF-Z equivalent, key selection criteria include its 4MHz programmability for AM/ADSL band avoidance, internal soft-start, precision current limit without sense resistor, ceramic-capacitor stability, and thermal shutdown with 15°C hysteresis.
Technical Context
The MP4459 operates in peak-current-mode control with a 100ns minimum on/off time, enabling stable regulation at high frequencies. Its error amplifier features 200V/V gain and 40–80µA/V transconductance, with COMP clamped between 0.9V and 2.0V during normal operation and pulled to GND in shutdown.
Frequency is set externally via RFREQ (e.g., 18kΩ for 4MHz), and bootstrap charging relies on VIN-to-SW voltage headroom; the floating driver includes UVLO (2.2V rising threshold) and draws ~20µA quiescent current. Thermal shutdown activates at 150°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 36V - supports 12V/24V automotive batteries and industrial 24–36V rails without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in compact systems. |
| Switching Frequency | Up to 4MHz (programmable) - enables use of small inductors and avoids critical EMI bands like AM radio (530–1710kHz). |
| Quiescent Current | 120µA - extends battery life in always-on or low-power wake-up applications such as telematics or remote sensors. |
| Feedback Reference | 0.8V ±2.4% - allows precise output regulation down to 0.8V and up to 30V using standard resistor dividers. |
| High-Side RDS(ON) | 150mΩ - reduces conduction loss and improves efficiency (up to 95%) at 1.5A load under typical conditions. |
| Soft-Start Time | 1.5ms - prevents output overshoot during power-up, eliminating need for external sequencing circuitry. |
Pinout & Package
MP4459DQT-LF-Z is housed in a thermally enhanced 10-pin 3mm × 3mm TQFN package with exposed pad for improved heat dissipation. The package supports high-density PCB layouts and meets RoHS-compliant lead-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch Node | Drives external Schottky diode; requires low-inductance layout to minimize voltage spikes and EMI. |
| 3 EN | Enable Input | Positive logic control (1.5V rise / 1.2V fall thresholds); internal 1µA pull-up enables default operation when floating. |
| 4 COMP | Compensation Node | Error amplifier output; connects to RC network for loop stability-critical for transient response and noise immunity. |
| 5 FB | Feedback Input | Senses output voltage divider; referenced to internal 0.8V bandgap-determines final regulated output accuracy. |
| 6 GND | Power Ground | Common return for control circuitry and output capacitor; must be routed away from high-switching-current paths. |
| 7 FREQ | Frequency Set | Connects to ground via resistor (e.g., 18kΩ for 4MHz); sets oscillator frequency and impacts inductor size/EMI profile. |
| 8, 9 VIN | Input Supply | Primary power input (3.8–36V); requires local 100nF ceramic decoupling close to pins to suppress switching noise. |
| 10 BST | Bootstrap Supply | Charges external capacitor between BST and SW; enables high-side gate drive-requires proper voltage headroom (>2V) during off-time. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Soft-Start | 1.5ms ramp prevents output overshoot and eliminates need for external timing components or sequencing ICs. |
| Precision Current Limit | 2.5A cycle-by-cycle limit without external sense resistor-reduces BOM count and board space while ensuring overcurrent protection. |
| Ceramic Capacitor Stable | Supports low-ESR ceramic output caps without oscillation-enables compact, high-reliability designs with no tantalum/electrolytic dependency. |
| UVLO with Hysteresis | 3.0V turn-on / 2.6V turn-off thresholds prevent erratic startup/shutdown near brown-out conditions in automotive environments. |
| Thermal Shutdown Protection | 150°C trip with 15°C hysteresis ensures safe recovery after overload or poor heatsinking-no latch-up or manual reset required. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powers display controllers and audio codecs in car head units operating from 12V battery with cold-crank dips to 3.8V. IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator delivering 1.5A with fast transient response to handle burst-mode DSP loads. Use Value: 4MHz operation avoids AM band interference; 120µA quiescent current minimizes parasitic drain during vehicle sleep mode. | Use Scenario: Supplies 3.3V to wireless sensor modules (LoRa, BLE) deployed in factory-floor IIoT gateways with 24V DC input. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling >90% efficiency at light loads and supporting wide input variation due to long cable drops. Use Value: 36V absolute max rating tolerates 24V system surges; programmable frequency allows optimization for EMI filter size vs. efficiency trade-off. |
| Distributed Telecom Power | Battery-Powered Medical Monitor |
Use Scenario: Generates 1.8V/2.5V rails for FPGA I/O banks and ADCs in remote radio units powered from 48V PoE-derived supplies. IC Role / Device Role / Timing Role: Intermediate point-of-load regulator stepping 12V down to sub-3V logic rails with tight regulation and low noise. Use Value: 0.8V reference enables accurate low-voltage outputs; current-mode control ensures stability with varying line/load conditions. | Use Scenario: Powers portable ECG monitors running on single-cell Li-ion (3.0–4.2V) or dual-cell alkaline (2.0–3.2V) batteries. IC Role / Device Role / Timing Role: Main system supply delivering 3.3V at up to 1.5A while maintaining ultra-low standby current during patient monitoring intervals. Use Value: 120µA IQ extends battery runtime beyond 72 hours in sleep mode; internal soft-start prevents false trigger of reset circuits. |
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 | 2A output, 2MHz fixed frequency, 4.5–36V input, 120µA IQ, same TQFN-10 package | Lacks frequency programming and has higher RDS(ON) (200mΩ); less suitable for EMI-sensitive 4MHz operation | Select when higher output current is needed and 4MHz is not required; verify thermal margin at full load. |
| LM61480RQR | 3.5A output, 2.1–6MHz programmable, 3–36V input, 15µA IQ, 16-pin QFN | Lower IQ but larger package and higher cost; includes PMOS sync rectifier for higher efficiency at light loads | Prefer for high-current, ultra-low-IQ designs where footprint and BOM cost are secondary to performance. |
Compared with MP2451DT-LF-Z and LM61480RQR, MP4459DQT-LF-Z uniquely balances 4MHz EMI avoidance, 1.5A capability, and minimal external component count in a 3×3mm footprint-making it optimal for space-constrained, frequency-sensitive applications where 120µA IQ and ceramic-capacitor stability are essential.
Availability
MP4459DQT-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and distributed telecom power systems requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for MP4459DQT-LF-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 MP4459 belongs to MPS's high-frequency buck converter product line, engineered for EMI-sensitive, space-constrained applications in automotive, industrial, and battery-powered systems where wide input range and low quiescent current are critical.
FAQ
What is the maximum recommended output voltage for MP4459DQT-LF-Z?
The MP4459DQT-LF-Z supports output voltages from 0.8V to 30V, set by an external resistive divider on the FB pin. The upper limit is constrained by the 36V absolute maximum input rating and internal reference tolerance; operation above 30V risks violating feedback amplifier headroom and stability margins per the datasheet's recommended operating conditions.
Can MP4459DQT-LF-Z operate with a 3.3V input supply?
No-MP4459DQT-LF-Z requires a minimum input voltage of 3.8V per its absolute operating specification. At 3.3V, the internal UVLO (2.7–3.3V threshold) prevents startup, and the 2.6V internal regulator cannot sustain core circuitry. For sub-3.8V inputs, consider MPS's MP2451 or MPQ4420A, which support lower VIN ranges.
Is an external Schottky diode mandatory for MP4459DQT-LF-Z?
Yes-an external Schottky diode is required because MP4459DQT-LF-Z is a non-synchronous buck converter with only an integrated high-side MOSFET. The diode conducts during the low-side interval; selection criteria include ≥40V reverse voltage rating (to exceed max VIN), ≥1.5A average current rating, and low forward voltage to maintain efficiency.
How does the FREQ pin resistor value affect efficiency and thermal performance?
A lower RFREQ (e.g., 18kΩ → 4MHz) increases switching losses and reduces efficiency at medium-to-heavy loads but allows smaller magnetics and better EMI filtering. Higher RFREQ (e.g., 100kΩ → 1MHz) lowers switching loss and improves thermal margin but requires larger inductors and may worsen low-frequency EMI. Optimal selection balances size, efficiency, and spectral constraints per application.
Does MP4459DQT-LF-Z support forced PWM or power-save mode?
No-MP4459DQT-LF-Z operates exclusively in peak-current-mode PWM without pulse-skipping or burst-mode capability. It maintains fixed-frequency operation across all load conditions, ensuring predictable EMI spectrum and consistent transient response-but lacks ultra-low-IQ discontinuous conduction mode for sub-mA loads.
What is the purpose of the exposed thermal pad on the TQFN package?
The exposed pad on the bottom of the MP4459DQT-LF-Z's TQFN-10 package provides a low-thermal-resistance path (θJC = 12°C/W) from the silicon die to the PCB copper. It must be soldered to a solid thermal pad connected to internal/external ground planes to dissipate up to 2.5W at TA = 25°C and prevent thermal shutdown under sustained 1.5A operation.
Can the COMP pin be left unconnected or tied directly to FB?
No-COMP must be connected to an external RC compensation network per the datasheet's design guidelines. Leaving it open causes instability and oscillation; tying it to FB shorts the error amplifier output and disables regulation. Typical networks use 54.9kΩ–147kΩ resistors and 100–220pF capacitors depending on VOUT, L, and CO values.
MP4459DQT-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- 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):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 1.5A
- Frequency - Switching:
- Up to 4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TQFN (3x3)
MP4459DQT-LF-Z FAQ
1.How can I place an order for MP4459DQT-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4459DQT-LF-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 MP4459DQT-LF-Z reliable?
The price and inventory of MP4459DQT-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4459DQT-LF-Z is usually 5 days.
3.What payment methods are accepted for MP4459DQT-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4459DQT-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4459DQT-LF-Z?
MP4459DQT-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4459DQT-LF-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 MP4459DQT-LF-Z?
For technical support, including MP4459DQT-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4459DQT-LF-Z requirements.
6.How does Aetrix verify that MP4459DQT-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP4459DQT-LF-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 MP4459DQT-LF-Z meets industry standards.
7.What is the process for return or replacement of MP4459DQT-LF-Z?
All MP4459DQT-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4459DQT-LF-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 MP4459DQT-LF-Z part is unused and in its original packaging.
Return procedure for MP4459DQT-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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