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Monolithic Power Systems Inc. MP1542DK-LF-P
- Part No.:
- MP1542DK-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MP1542DK-LF-P.pdf
- Description:
- IC REG BOOST ADJ 2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,972
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Product details
Overview
MP1542DK-LF-P from Monolithic Power Systems is a current-mode, fixed-frequency boost DC-DC converter with an integrated 2A/0.18Ω/25V N-channel MOSFET switch, supporting selectable 700kHz or 1.3MHz operation, 2.5V–22V input range, and up to 22V output. It delivers 12V at 500mA from a 5V supply in LCD bias and portable power applications.
For engineers reviewing the MP1542DK-LF-P datasheet, MP1542DK-LF-P pinout, MP1542DK-LF-P application, or MP1542DK-LF-P equivalent, key selection criteria include programmable soft-start timing, external compensation flexibility for ceramic capacitor compatibility, UVLO threshold (2.45V rising), thermal shutdown (160°C), and FSEL-controlled frequency selection - all critical for compact, low-noise boost designs.
Technical Context
The MP1542DK-LF-P implements peak-current-mode control with a transconductance error amplifier (GEA = 350 µA/V, AVEA = 1000 V/V) and internal 1.25V reference. Its architecture includes a dedicated COMP pin for two-pole/one-zero loop compensation, enabling stable regulation with low-ESR ceramic output capacitors.
Switching frequency is selected via FSEL pin logic (GND = 700kHz, IN = 1.3MHz), and soft-start is controlled by a 6µA constant-current source charging an external capacitor at SS. The device operates in continuous conduction mode and features a right-half-plane zero requiring crossover frequency placement ≥1 decade below fRHPZ for phase margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 2A continuous, 0.18Ω RDS(on), 25V drain-source max - enables high-efficiency step-up with minimal conduction loss at 500mA load. |
| Input Voltage Range | 2.5V to 22V - supports single-cell Li-ion (2.7–4.2V), 3.3V/5V rails, and wide-input industrial supplies. |
| Output Voltage Range | 3V to 22V - configurable via FB resistor divider (1.25V reference); validated for 8V/12V/18V outputs in LCD and camera bias. |
| Switching Frequency | 700kHz or 1.3MHz (pin-selectable) - allows trade-off between inductor size (smaller at 1.3MHz) and EMI filtering ease (lower freq = simpler filter). |
| Soft-Start Current | 6µA constant current into SS pin - enables precise, adjustable startup ramp time (tSS = 0.0133 × CSS) to limit inrush. |
| Thermal Shutdown | 160°C junction temperature - protects against sustained overload or poor PCB thermal design without latch-off. |
| UVLO Threshold | 2.45V (rising), 100mV hysteresis - prevents erratic startup near battery depletion while avoiding chatter during brownout. |
Pinout & Package
MP1542DK-LF-P is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm height), lead-free and RoHS-compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Compensation node | Connects external RC network to set loop poles/zeros; directly interfaces error amplifier output for stability tuning with ceramic caps. |
| 2 FB | Feedback input | Senses output voltage via resistive divider; 1.25V internal reference enables precise output regulation across temperature (-40°C to +85°C). |
| 3 EN | Enable control | Active-high logic input; 1.5V turn-on threshold allows direct microcontroller GPIO control or pull-up for automatic startup. |
| 4 GND | Power ground | Main return path for switch current and analog circuitry; requires low-inductance connection to minimize noise coupling. |
| 5 SW | Switch node | Drain of internal MOSFET; connects to inductor and Schottky diode anode; swings from GND to up to 25V during operation. |
| 6 IN | Input supply | High-current input rail; requires local ≥4.7µF low-ESR ceramic bypass capacitor placed adjacent to pin for ripple suppression. |
| 7 FSEL | Frequency select | Logic input: tied to GND for 700kHz, to IN for 1.3MHz; determines switching period and influences inductor/capacitor sizing. |
| 8 SS | Soft-start control | Accepts external capacitor charged at 6µA; clamps COMP voltage during startup to limit peak inductor current and input surge. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A Power Switch | 0.18Ω RDS(on) MOSFET eliminates external switch, reducing BOM count and layout area in space-constrained portable designs. |
| Programmable Soft-Start | 6µA constant-current source at SS pin enables predictable, capacitor-timed startup ramp - critical for avoiding input rail collapse in battery-powered systems. |
| External Compensation | Direct access to error amplifier output (COMP) allows full control over loop dynamics, supporting fast transient response with small ceramic output caps (4.7–22µF). |
| Wide Input/Output Range | 2.5V–22V input and 3V–22V output enable single-chip solutions for diverse rails: 3.3V→8V (TFT gate drive), 5V→12V (camera flash), or 12V→18V (AMLCD VGH). |
| FSEL Frequency Selection | Hardware-selectable 700kHz/1.3MHz operation avoids software configuration overhead and ensures deterministic EMI profile across production units. |
Applications
| AMLCD Panel Bias Supply | Portable Camera Flash Driver |
|---|---|
|
Use Scenario: Generating dual ±9V and +26V rails for TFT-LCD gate drivers and source drivers in ultra-thin handheld displays. IC Role / Device Role / Timing Role: Primary boost regulator providing stable, low-noise positive high-voltage rail; operates at 700kHz to reduce EMI coupling into sensitive analog video paths. Use Value: Enables single-chip multi-output bias generation with <1.25% FB reference drift over -40°C to +85°C, ensuring consistent display contrast and grayscale fidelity. |
Use Scenario: Charging a 100µF flash capacitor to 300V in digital still cameras using charge-pump cascading stages fed by MP1542 output. IC Role / Device Role / Timing Role: High-efficiency intermediate boost stage delivering 12V@500mA from 3.7V Li-ion; configured at 1.3MHz to minimize inductor footprint in tight camera module layouts. Use Value: Achieves >85% efficiency at 500mA load with 5V input, reducing thermal stress and extending battery life during rapid flash cycling. |
| Handheld Medical Sensor Interface | Industrial IoT Node Power Management |
|
Use Scenario: Powering analog front-end ICs requiring clean ±5V rails from a single 3.3V coin-cell or energy-harvesting source in portable diagnostic devices. IC Role / Device Role / Timing Role: Primary DC-DC booster feeding a low-noise LDO or charge pump; UVLO (2.45V) prevents malfunction during battery sag under sensor burst sampling. Use Value: Maintains regulation down to 2.5V input, enabling >20% additional usable battery capacity compared to 3.0V-minimum boosters. |
Use Scenario: Providing regulated 12V supply for RS-485 transceivers and 3.3V LDO input in battery-backed industrial telemetry nodes operating in remote locations. IC Role / Device Role / Timing Role: Main system power converter operating in intermittent duty cycle; EN pin enables MCU-controlled sleep/wake sequencing to minimize quiescent current (700µA typ). Use Value: Delivers 90% peak efficiency at light loads (10mA) and integrates thermal shutdown to prevent field failure in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5A switch, 2.7V–12V input, fixed 500kHz/1.1MHz (non-selectable), no external COMP pin. | Lacks programmable compensation and FSEL flexibility; optimized for higher-current USB PD sink applications. | Choose when >2A output current is required and loop tuning simplicity is preferred over fine-grained stability control. |
| RT8535GSP | 2A switch, 2.5V–5.5V input only, fixed 1.5MHz, integrated soft-start (no SS pin), no FSEL option. | Restricted to low-input-voltage applications (e.g., single Li-ion); lacks UVLO hysteresis and thermal foldback. | Choose for cost-sensitive, space-constrained 3.3V→5V/8V boost where input never drops below 2.5V and thermal margin is ample. |
Compared with TPS61088RHLR and RT8535GSP, MP1542DK-LF-P uniquely balances wide input range (2.5V–22V), hardware-selectable frequency, and full external loop control - making it optimal for multi-rail, thermally constrained, or EMI-sensitive portable power designs where stability and startup behavior must be precisely tailored.
Availability
MP1542DK-LF-P is available at Aetrix Electronics and suitable for LCD display bias supplies, portable camera power management, and handheld medical sensor interfaces requiring stable component supply across extended product lifecycles.
Supply support for MP1542DK-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 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 compact, low-noise portable power applications demanding wide input range, flexible frequency selection, and robust protection features.
FAQ
What is the minimum input voltage required for MP1542DK-LF-P to start switching?
The MP1542DK-LF-P begins switching when the input voltage rises above its undervoltage lockout (UVLO) threshold of 2.45V (typical, rising). Below this level, the internal circuitry remains disabled to prevent unstable operation. Startup is guaranteed once VIN exceeds 2.45V and EN is asserted high.
Can MP1542DK-LF-P generate 15V output from a 3.3V input?
Yes - the MP1542DK-LF-P supports output voltages up to 22V. To achieve 15V from 3.3V input, configure the FB resistor divider so that R1 = 8kΩ × (15V − 1.25V) = 110kΩ (with R2 = 10kΩ). Ensure inductor saturation current exceeds peak switch current (~2.2A at 50% duty) and use a ≥25V Schottky diode.
How does the FSEL pin affect inductor selection?
FSEL sets switching frequency: GND = 700kHz → recommend 10µH inductor; IN = 1.3MHz → recommend 4.7µH. Higher frequency allows smaller inductance but increases core loss and requires lower-DCR windings. Inductor RMS current rating must exceed 0.5 × IOUT / (1 − D), where D = 1 − VIN/VOUT.
Is an external Schottky diode mandatory for MP1542DK-LF-P operation?
Yes - the MP1542DK-LF-P uses an external synchronous rectifier diode. A Schottky diode is mandatory due to its low forward voltage (≤0.4V) and fast recovery (<10ns), minimizing conduction loss and reverse-recovery spikes. Diode reverse voltage rating must exceed the programmed output voltage.
What is the purpose of the COMP pin beyond compensation?
The COMP pin provides direct access to the error amplifier output, enabling not only loop compensation but also monitoring of regulation status (e.g., overvoltage detection via external comparator) and dynamic loop adjustment. It is not intended for feedback injection or external biasing - only RC network connection to GND is supported per datasheet.
Does MP1542DK-LF-P support forced PWM mode or discontinuous conduction mode (DCM)?
No - the MP1542DK-LF-P operates exclusively in peak-current-mode continuous conduction mode (CCM) with fixed frequency. It does not include pulse-skipping, burst-mode, or DCM capability. Light-load efficiency is maintained via low quiescent current (700µA typ), not mode switching.
How is thermal performance affected by the MSOP-8 package without thermal pad?
The MSOP-8 package has θJA = 150°C/W (4-layer PCB). At 500mA output with 5V→12V conversion, power dissipation is ~0.3W, resulting in ~45°C junction rise above ambient. Adequate copper pour on GND and IN/SW traces is essential; exceeding 125°C junction temperature triggers thermal shutdown.
MP1542DK-LF-P 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-P FAQ
1.How can I place an order for MP1542DK-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1542DK-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 MP1542DK-LF-P reliable?
The price and inventory of MP1542DK-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 MP1542DK-LF-P is usually 5 days.
3.What payment methods are accepted for MP1542DK-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1542DK-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1542DK-LF-P?
MP1542DK-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1542DK-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 MP1542DK-LF-P?
For technical support, including MP1542DK-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1542DK-LF-P requirements.
6.How does Aetrix verify that MP1542DK-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1542DK-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 MP1542DK-LF-P meets industry standards.
7.What is the process for return or replacement of MP1542DK-LF-P?
All MP1542DK-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1542DK-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 MP1542DK-LF-P part is unused and in its original packaging.
Return procedure for MP1542DK-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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