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Monolithic Power Systems Inc. MP1542DK-LF-Z
- Part No.:
- MP1542DK-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MP1542DK-LF-Z.pdf
- Description:
- IC REG BOOST ADJ 2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,647
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Product details
Overview
MP1542DK-LF-Z from Monolithic Power Systems is a current-mode, fixed-frequency boost DC-DC converter IC with an integrated 2A/25V/0.18Ω N-channel MOSFET switch, selectable 700kHz or 1.3MHz switching frequency, 1.25V feedback reference, and programmable soft-start. It operates from 2.5V–22V input to generate up to 22V output (e.g., 12V at 500mA from 5V), targeting portable LCD bias supplies and compact power rails.
For engineers reviewing the MP1542DK-LF-Z datasheet, MP1542DK-LF-Z pinout, MP1542DK-LF-Z application, or MP1542DK-LF-Z equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation insights, and confirmed alternative options - all grounded in Monolithic Power's Rev. 1.5 datasheet and MSOP-8 package documentation.
Technical Context
The MP1542 employs peak-current-mode control with a transconductance error amplifier (350 µA/V gain) and external COMP compensation network to stabilize the regulation loop. Its dual-frequency selection (via FSEL pin) enables noise-sensitive or size-constrained designs: 1.3MHz supports ultra-small inductors/ceramic caps, while 700kHz improves efficiency under medium loads.
It integrates UVLO (2.45V turn-on, 100mV hysteresis), thermal shutdown (160°C), internal current limiting (2A at 50% duty cycle), and soft-start (6µA constant-current charge to SS pin). The 1.25V FB reference enables precise output setting via resistor divider, and SW pin swings up to 25V, supporting high-ratio boosts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 700kHz or 1.3MHz (pin-selectable via FSEL); enables EMI filtering optimization and small passive sizing. |
| Internal Switch | 2A, 25V, 0.18Ω N-MOSFET; supports ≥500mA output at 12V from 5V input with low conduction loss. |
| Feedback Reference | 1.25V ±2.5% (25°C); sets output voltage accuracy and stability across temperature (-40°C to +85°C). |
| Input Voltage Range | 2.5V to 22V; powers directly from single Li-ion, USB, or industrial 3.3V/5V/12V rails. |
| Soft-Start Current | 6µA (constant current into SS pin); enables controlled inrush limiting and predictable startup timing. |
| UVLO Threshold | 2.45V rising (±300mV); prevents erratic operation during brown-out and ensures clean enable sequencing. |
| Thermal Shutdown | 160°C junction temperature; protects die during overload or poor PCB thermal design without latch-off. |
Pinout & Package
MP1542DK-LF-Z is housed in an 8-pin MSOP package (3.0mm × 4.9mm × 1.0mm max height), thermally enhanced with exposed pad (not electrically connected), JEDEC MO-187 AA compliant, and RoHS/lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Compensation node | Connects external RC network to set loop bandwidth and phase margin; critical for stability with ceramic output caps. |
| 2 FB | Feedback input | Senses output via resistive divider; 1.25V reference defines regulation point; high-impedance (−100nA bias) minimizes divider error. |
| 3 EN | Enable control | Active-high logic input; 1.5V threshold allows direct MCU GPIO drive; must not float-requires pull-up if unused. |
| 4 GND | Power and signal ground | Primary return path for switch current, feedback, and compensation; requires low-inductance connection to minimize noise. |
| 5 SW | Switch node | Drain of internal MOSFET; swings from GND to VOUT+Vf(diode); connects to inductor and Schottky rectifier. |
| 6 IN | Input supply | Accepts 2.5V–22V; requires local high-frequency bypass (≥4.7µF ceramic) placed adjacent to pin. |
| 7 FSEL | Frequency select | Tie to GND for 700kHz, to IN for 1.3MHz; determines ripple frequency, inductor size, and EMI profile. |
| 8 SS | Soft-start control | Charged by 6µA current source; clamps COMP voltage during startup to limit inrush and prevent input droop. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable switching frequency | 700kHz or 1.3MHz choice enables trade-off between inductor size (smaller at 1.3MHz) and efficiency (higher at 700kHz under load). |
| Programmable soft-start | 6µA constant-current source into SS pin allows precise control of startup time (e.g., 75µs with 1nF cap) to avoid input rail collapse. |
| Integrated 2A/0.18Ω MOSFET | Eliminates external switch and gate driver; reduces BOM count and layout area while maintaining >85% efficiency at 500mA load. |
| External compensation | COMP pin enables full loop tuning for diverse output capacitors (ceramic/tantalum) and load transient requirements. |
| Wide input range (2.5V–22V) | Supports single-cell Li-ion (2.7–4.2V), USB 5V, and industrial 12V/24V inputs without pre-regulation. |
Applications
| AMLCD TFT Bias Supply | Portable Medical Instrument Power |
|---|---|
|
Use Scenario: Generating ±9V and +26V rails for active-matrix LCD column/row drivers and gate drivers in handheld ultrasound or diagnostic displays. IC Role / Device Role / Timing Role: Primary positive boost regulator (VOUT = +26V @ 5mA) with fast transient response to support dynamic backlight and pixel charging. Use Value: Enables compact, low-profile (<1.2mm) multi-output power solution using single IC and discrete diodes-reducing board space vs. multiple converters. |
Use Scenario: Providing stable 12V bias for analog front-end amplifiers and ADC references in battery-powered ECG or pulse oximeter modules. IC Role / Device Role / Timing Role: High-efficiency step-up stage converting 3.3V MCU rail to 12V sensor excitation, operating in discontinuous conduction mode for light-load efficiency. Use Value: Delivers >90% efficiency at 100mA load with 700kHz switching, minimizing heat rise and extending battery life in sealed enclosures. |
| Digital Camera Flash LED Driver | Industrial Sensor Node Boost Rail |
|
Use Scenario: Supplying 5V–12V to white LED flash circuits in compact digital still/video cameras where input is 3.7V Li-ion. IC Role / Device Role / Timing Role: Constant-voltage boost controller driving series LED strings; soft-start prevents camera processor reset during flash activation. Use Value: 2A switch handles peak LED currents up to 1.5A; 1.3MHz operation allows <10µH inductor, enabling ultra-thin camera module designs. |
Use Scenario: Generating 5V or 12V from 3.3V industrial IoT sensor nodes (e.g., RS-485 transceivers, isolated ADCs) powered by energy harvesting or long-life batteries. IC Role / Device Role / Timing Role: Always-on boost regulator with UVLO and thermal protection, supporting wide ambient temperature (−40°C to +85°C) operation. Use Value: 700kHz/1.3MHz flexibility allows optimal efficiency vs. size trade-off; MSOP-8 package fits dense sensor PCB layouts with minimal thermal footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1541DK-LF-Z | Same MSOP-8 package, but 1.5A switch (0.22Ω RDS(on)) and fixed 1.3MHz only; no FSEL pin. | Limited to lower output current (≤350mA at 12V); lacks frequency flexibility for EMI-sensitive systems. | Select when cost sensitivity outweighs need for 2A capability or dual-frequency tuning. |
| TPS61088RHLR | 2.5A/17V switch, 2.5V–12V input, fixed 1.1MHz, integrated soft-start, but no external COMP pin. | Higher max input voltage (12V vs. 22V); no loop tuning-less adaptable to custom capacitor/inductor selections. | Choose for plug-and-play designs requiring higher current or tighter input range, accepting reduced compensation control. |
Compared with MP1542DK-LF-Z, MP1541DK-LF-Z trades current capability and frequency flexibility for lower cost, while TPS61088RHLR offers higher current and simpler layout at the expense of external loop tuning-making MP1542DK-LF-Z optimal for designs demanding both robust 2A performance and full control over stability and EMI behavior.
Availability
MP1542DK-LF-Z is available at Aetrix Electronics and suitable for LCD display bias generation, portable medical instrumentation, digital camera flash power, and industrial sensor node boost rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP1542DK-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 core expertise in DC-DC conversion, motor drivers, and LED lighting controllers.
The MP1542 belongs to MPS's high-efficiency, current-mode boost converter product line, designed specifically for space-constrained, battery-powered applications requiring wide input range, flexible frequency selection, and robust protection features.
FAQ
What is the maximum output voltage achievable with MP1542DK-LF-Z?
The MP1542DK-LF-Z supports output voltages up to 22V, as specified in its Absolute Maximum Ratings and Recommended Operating Conditions. This is enabled by its 25V-rated internal MOSFET and ability to sustain high duty cycles (up to 95%)-confirmed by datasheet testing at 12V/500mA from 5V input and validated in typical application circuits generating 26V in multi-output LCD configurations.
Can MP1542DK-LF-Z operate from a single-cell Li-ion battery?
Yes. With a minimum input voltage of 2.5V and guaranteed operation down to 2.5V at full load, MP1542DK-LF-Z supports the full discharge curve of a standard Li-ion cell (2.7V–4.2V). Its UVLO threshold of 2.45V ensures reliable startup even at end-of-discharge, and efficiency remains above 80% at 3.3V input/8V output per typical performance curves.
Is an external Schottky diode required, and what specifications are critical?
Yes-an external Schottky diode is mandatory for the boost topology. Per datasheet Application Information, it must have reverse voltage rating ≥ VOUT, average current rating > maximum load current, and peak current rating > peak inductor current (e.g., >2.6A for worst-case duty cycle). Low forward voltage (≤0.4V) and fast recovery (<30ns) are essential to maintain efficiency and minimize thermal stress.
How does the FSEL pin affect loop stability and component selection?
FSEL selects switching frequency (700kHz or 1.3MHz), which directly impacts inductor value, output capacitor ESR requirements, and compensation network design. Table 1 in the datasheet provides validated R3/C3 values for each frequency/output combination. At 1.3MHz, smaller inductors (4.7µH) and lower C3 (1–2.2nF) are used; at 700kHz, larger inductors (10µH) and higher C3 (2.2–4.7nF) ensure adequate phase margin and transient response.
Does MP1542DK-LF-Z support forced PWM or PFM mode selection?
No. MP1542DK-LF-Z operates exclusively in constant-frequency, peak-current-mode PWM. It does not include pulse-frequency modulation (PFM) or burst-mode capability. Light-load efficiency is maintained via low quiescent current (700–900µA) and optimized gate drive, but the switching frequency remains fixed at either 700kHz or 1.3MHz regardless of load.
What is the thermal performance of the MSOP-8 package under full 2A load?
In the MSOP-8 package, θJA is 150°C/W. At 2A output with 5V→12V conversion (≈65% efficiency), power dissipation is ~2.2W. With TA = 25°C, calculated junction temperature is ≈355°C-exceeding the 150°C absolute max. Therefore, full 2A continuous output requires significant PCB copper area, thermal vias to inner layers, or derating per the thermal derating curve in the datasheet's "Continuous Power Dissipation" section.
Can the COMP pin be left unconnected for basic operation?
No. The COMP pin is an active output of the error amplifier and must be connected to an external RC compensation network (resistor + capacitor to GND) as shown in all typical application circuits. Leaving COMP floating causes instability, oscillation, or failure to regulate. The datasheet specifies exact R3/C3 values based on VOUT, C2, and switching frequency to ensure ≥45° phase margin.
MP1542DK-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 22V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 1.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MP1542DK-LF-Z FAQ
1.How can I place an order for MP1542DK-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1542DK-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 MP1542DK-LF-Z reliable?
The price and inventory of MP1542DK-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 MP1542DK-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1542DK-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1542DK-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1542DK-LF-Z?
MP1542DK-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1542DK-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 MP1542DK-LF-Z?
For technical support, including MP1542DK-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1542DK-LF-Z requirements.
6.How does Aetrix verify that MP1542DK-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1542DK-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 MP1542DK-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1542DK-LF-Z?
All MP1542DK-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1542DK-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 MP1542DK-LF-Z part is unused and in its original packaging.
Return procedure for MP1542DK-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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