My Inquiry
My Account
Monolithic Power Systems Inc. MP4459DQT-LF-P
- Part No.:
- MP4459DQT-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MP4459DQT-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP4459DQT-LF-P from Monolithic Power Systems is a 1.5A, 4MHz, 36V non-synchronous step-down DC/DC converter with integrated 150mΩ high-side MOSFET, 120µA quiescent current, and programmable switching frequency. It operates from 3.8V to 36V input, regulates output from 0.8V to 30V, and targets automotive power rails and high-voltage industrial supplies.
For engineers reviewing the MP4459DQT-LF-P datasheet, MP4459DQT-LF-P pinout, MP4459DQT-LF-P application, or MP4459DQT-LF-P equivalent, key selection criteria include input voltage range (3.8–36V), peak output current (1.5A), thermal shutdown threshold (150°C), soft-start time (1.5ms), and FREQ-pin programmability for EMI-sensitive designs.
Technical Context
The MP4459DQT-LF-P uses current-mode control with a transconductance error amplifier (GCS = 4.7 A/V) and internal 0.8V reference for precise output regulation. Its PWM cycle initiates on internal clock edges, with minimum on/off times of 100ns each to support high-frequency operation up to 4MHz.
It implements frequency foldback during startup to prevent inductor current runaway, integrates a 2.6V internal regulator for biasing across full VIN range, and employs bootstrap charging via external BST–SW capacitor to drive the floating high-side gate. Thermal shutdown (150°C trip, 135°C hysteresis) and UVLO (3.0V rising, 2.7V falling) ensure fault-tolerant operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 36V - supports direct connection to automotive battery (cold-crank down to ~4V) and industrial 24V/36V rails without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact embedded systems. |
| Switching Frequency | Programmable up to 4MHz via FREQ pin resistor - enables small external magnetics and avoids AM radio/ADSL interference bands. |
| Quiescent Current | 120µA - enables >1-year battery life in always-on IoT nodes powered by coin cells or Li-SOCl₂ batteries. |
| Feedback Reference | 0.8V ±2.4% - allows accurate output setting from 0.8V to 30V using standard resistor dividers; tolerance directly impacts output accuracy. |
| Internal MOSFET RDS(ON) | 150mΩ at VBST–VSW = 5V - limits conduction loss to <120mW at 1.5A, enabling >90% efficiency at mid-load with proper layout. |
| Soft-Start Time | 1.5ms - prevents output overshoot during power-up while allowing rapid system boot in time-critical applications. |
Pinout & Package
MP4459DQT-LF-P is housed in a thermally enhanced 10-pin 3mm × 3mm TQFN package with exposed thermal pad on underside for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch Node | Drain of internal high-side MOSFET; connects to inductor and Schottky diode cathode; requires low-inductance routing to minimize EMI and voltage spikes. |
| 3 EN | Enable Input | Positive-logic control pin with 1.5V rising / 1.2V falling thresholds; internal 1µA pull-up enables default-on operation when left floating. |
| 4 COMP | Compensation Node | Error amplifier output; connects to RC network for loop stability tuning; clamped between 0.9V and 2.0V during operation. |
| 5 FB | Feedback Input | Senses divided output voltage; compared against internal 0.8V reference to regulate VOUT; high-impedance node requiring clean routing. |
| 6 GND | Power Ground | Primary return path for switch current and control circuitry; must be connected near output capacitor with low-impedance plane to avoid noise coupling. |
| 7 FREQ | Frequency Programming | Connects external resistor to GND to set fS from 0.2MHz to 4MHz; 45kΩ yields nominal 2MHz, 18kΩ yields 4MHz. |
| 8, 9 VIN | Input Supply | High-current input rail for internal regulators and MOSFET driver; requires local 100nF ceramic decoupling placed within 2mm of pins. |
| 10 BST | Bootstrap Supply | Provides gate drive voltage for high-side MOSFET; requires 100nF ceramic capacitor between BST and SW pins for charge recycling. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic capacitor stable | Supports low-ESR ceramic output capacitors without requiring added series resistance-reduces BOM count and board area. |
| Precision current limit | 2.5A typical cycle-by-cycle current limit without external sense resistor-enables robust short-circuit protection with minimal component overhead. |
| Internal soft-start | 1.5ms monotonic VOUT ramp prevents inrush current and overshoot-eliminates need for external timing components in most applications. |
| Wide input range | 3.8V–36V operation covers 5V, 12V, 24V, and automotive 12V/24V systems with cold-crank margin-no external LDO or buck-boost required. |
| Thermal shutdown | 150°C junction trip with 15°C hysteresis-protects die under overload or poor heatsinking while allowing automatic recovery after cooldown. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Powering CAN transceivers, LIN drivers, and sensor signal conditioners in door modules and seat controllers. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator converting 12V battery to logic rails; handles load transients from solenoid actuation. Use Value: 4MHz operation avoids AM band interference; 120µA IQ extends battery life during sleep mode; 36V rating survives load-dump events. |
Use Scenario: Generating isolated 5V and 3.3V supplies for digital I/O expansion cards in modular PLC backplanes. IC Role / Device Role / Timing Role: Non-isolated buck converter delivering 1.5A per rail from 24V field bus; supports hot-swap insertion with controlled startup. Use Value: Wide 3.8–36V input accommodates brownout and overvoltage conditions; 150mΩ RDS(ON) minimizes self-heating in confined card slots. |
| Portable Medical Monitor | Distributed Telecom Power |
|
Use Scenario: Supplying analog front-end (AFE), ADC, and display backlight in handheld patient monitors running on Li-ion packs. IC Role / Device Role / Timing Role: High-efficiency step-down stage converting 7.4V (2S Li-ion) to 3.3V for mixed-signal subsystems; active during both measurement and standby. Use Value: 120µA quiescent current enables multi-week runtime on single charge; ceramic-stable design eliminates electrolytic capacitor aging concerns. |
Use Scenario: Local 5V conversion for remote PHYs and SFP+ modules in distributed base station radios with 48V intermediate bus. IC Role / Device Role / Timing Role: Compact 3×3mm buck regulator mounted directly on daughterboard; delivers 1.5A with minimal footprint and thermal mass. Use Value: 4MHz switching enables use of 2.2µH inductors (<7.5mm² footprint); TQFN package supports automated optical inspection and reflow profiling. |
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 | Lower 0.8A output current; fixed 2MHz frequency; no FREQ pin; 100µA IQ | Suitable only for sub-1A loads; lacks programmability for EMI tuning | Select when cost sensitivity outweighs current/frequency flexibility needs. |
| LM5164QDDARQ1 | Automotive-grade AEC-Q100; 1A output; 1.5MHz max; integrated bootstrap diode; higher 260µA IQ | Qualified for under-hood use; requires larger inductor due to lower fS | Prefer for automotive safety-critical systems requiring qualification evidence. |
Compared with MP4459DQT-LF-P, MP2451DT-LF-Z trades current headroom and frequency control for lower cost and simpler layout, while LM5164QDDARQ1 adds automotive qualification and integrated bootstrap but sacrifices output current and quiescent efficiency.
Availability
MP4459DQT-LF-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP4459DQT-LF-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP4459 belongs to MPS's high-frequency buck converter product line, engineered for compact, high-efficiency power conversion in space-constrained and EMI-sensitive applications such as automotive infotainment and industrial edge nodes.
FAQ
What is the maximum recommended output voltage for MP4459DQT-LF-P?
The MP4459DQT-LF-P supports output voltages up to 30V, set via the FB resistive divider. This is limited by the absolute maximum voltage rating of the FB pin (6V) and internal reference tolerance. For 30V output, R1/R2 ratio must yield ≤6V at FB under all operating conditions, including transient overvoltage.
Can MP4459DQT-LF-P operate with a 2.5V input supply?
No. The MP4459DQT-LF-P has a minimum operating input voltage of 3.8V, enforced by its internal UVLO circuit (rising threshold 3.0V, hysteresis 0.35V). At 2.5V, the device remains in shutdown with <18µA quiescent current and no switching activity.
Is an external bootstrap diode required for reliable operation?
No external bootstrap diode is required-the MP4459DQT-LF-P uses a dedicated internal bootstrap regulator that charges the BST capacitor from VIN during SW low periods. However, a low-VF Schottky diode from SW to GND is mandatory for output rectification and bootstrap capacitor charging path integrity.
How does frequency foldback improve startup reliability?
During startup, frequency foldback reduces switching frequency when output voltage is low, extending minimum off-time and preventing inductor current runaway. This avoids saturation and thermal stress before feedback regulation engages, especially critical with large output capacitors or heavy preloads.
What is the thermal performance of the 3x3mm TQFN package under 1.5A load?
With 2-layer PCB and 1in² copper pour under the exposed pad, θJA is ~50°C/W. At 1.5A output into 5V, power dissipation is ~0.3W, yielding ~15°C rise above ambient-well below the 125°C max operating junction temperature. Full derating applies above 85°C ambient.
Does MP4459DQT-LF-P support synchronous rectification?
No. The MP4459DQT-LF-P is a non-synchronous buck converter requiring an external Schottky diode for freewheeling. It lacks a low-side MOSFET driver or control logic for synchronous operation-this is confirmed by block diagram, pinout (no DRV/PHASE pin), and datasheet functional description.
MP4459DQT-LF-P 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-P FAQ
1.How can I place an order for MP4459DQT-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4459DQT-LF-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 MP4459DQT-LF-P reliable?
The price and inventory of MP4459DQT-LF-P 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-P is usually 5 days.
3.What payment methods are accepted for MP4459DQT-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4459DQT-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4459DQT-LF-P?
MP4459DQT-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4459DQT-LF-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 MP4459DQT-LF-P?
For technical support, including MP4459DQT-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4459DQT-LF-P requirements.
6.How does Aetrix verify that MP4459DQT-LF-P is sourced from the original manufacturer or authorized distributors?
All MP4459DQT-LF-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 MP4459DQT-LF-P meets industry standards.
7.What is the process for return or replacement of MP4459DQT-LF-P?
All MP4459DQT-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4459DQT-LF-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 MP4459DQT-LF-P part is unused and in its original packaging.
Return procedure for MP4459DQT-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP4459DQT-LF-P Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
