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Monolithic Power Systems Inc. MP1541DJ-LF-P
- Part No.:
- MP1541DJ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP1541DJ-LF-P.pdf
- Description:
- IC REG BOOST ADJ 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:979
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Product details
Overview
MP1541DJ-LF-P from Monolithic Power Systems is a current-mode 1.3MHz boost converter IC with integrated 0.65Ω MOSFET, operating from 2.5V–6V input to deliver up to 12V/300mA output. It features internal soft-start, 1.25V feedback reference, UVLO (2.45V), thermal shutdown (160°C), and current limit (1.9A), packaged in TSOT23-5 for space-constrained portable power rails.
For engineers reviewing the MP1541DJ-LF-P datasheet, MP1541DJ-LF-P pinout, MP1541DJ-LF-P application, or MP1541DJ-LF-P equivalent, this device is selected for low-input-voltage DC-DC boosting where compact size, fixed-frequency noise control, and battery-friendly startup behavior are critical - especially in flash LED drivers and small LCD bias supplies.
Technical Context
The MP1541DJ-LF-P implements a fixed-frequency (1.3MHz typ.) peak-current-mode control architecture with an internal ramp compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier compares FB voltage against a 1.25V bandgap reference and drives a PWM comparator whose threshold includes both sensed current and slope compensation.
It integrates a 0.65Ω RDS(on) N-channel MOSFET switch, supports duty cycles up to 85%, and uses internal soft-start (120µs) that ramps current limit in three 40µs steps - directly limiting inrush and improving battery longevity in handheld systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.3 MHz typical; enables use of <2mm-height inductors and ceramic capacitors, reducing board area and EMI filtering complexity. |
| Input Voltage Range | 2.5 V to 6 V; supports single-cell Li-ion (3.0–4.2V), LiFePO₄ (2.5–3.6V), and 3.3V/5V rail boosting. |
| Output Voltage Range | 3 V to 22 V; set via external resistor divider; 12 V @ 300 mA achievable from 5 V input. |
| Feedback Reference | 1.25 V ±4% (1.21–1.29 V); defines regulation accuracy and sets output voltage scaling ratio. |
| Current Limit | 1.9 A typical; protects internal MOSFET during overload or short-circuit; limits peak inductor current. |
| Quiescent Current | 635–850 µA; minimizes standby power loss in battery-powered devices with intermittent operation. |
| UVLO Threshold | 2.45 V rising; prevents erratic startup below minimum input; 92 mV hysteresis avoids chatter near cutoff. |
Pinout & Package
MP1541DJ-LF-P is housed in a 5-pin TSOT23 package (2.9 × 1.6 × 1.1 mm), optimized for high-density portable PCB layouts. Thermal resistance θJA = 220°C/W enables operation up to +85°C ambient with minimal copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Power Switch Drain | Connects to inductor and rectifier cathode; swings from GND to up to 22 V; carries full switching current and requires low-inductance routing. |
| 2 - GND | Analog & Power Ground | Common return for FB, EN, and internal circuitry; must be tied to low-impedance ground plane adjacent to IN and CIN. |
| 3 - FB | Feedback Input | Senses output via resistive divider; 1.25 V reference point; high-impedance node requiring short trace and local decoupling. |
| 4 - EN | Enable Control | Active-high logic input (1.3 V threshold); must not float; connects to VIN for automatic startup or MCU GPIO for sequencing. |
| 5 - IN | Input Supply | Accepts 2.5–6 V; requires local 4.7 µF ceramic bypass capacitor placed within 2 mm of pin to suppress ripple and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.65Ω MOSFET | Eliminates external high-side switch, reduces BOM count, and improves efficiency at light-to-moderate loads (≥75% at 100mA). |
| 1.3MHz fixed-frequency operation | Enables consistent EMI profile and predictable filter design; avoids audible noise and simplifies compliance testing. |
| Internal soft-start (120µs) | Ramps current limit in discrete steps to constrain inrush, prevent input droop, and extend primary cell life in flash applications. |
| Thermal shutdown (160°C) | Protects die under sustained overload or poor heatsinking; auto-recovery after cooldown ensures robust field operation. |
| UVLO with 92mV hysteresis | Ensures clean power-on reset and prevents brown-out oscillation during battery discharge or cold start. |
Applications
| Camera Phone Flash | Handheld Computer Power |
|---|---|
Use Scenario: Driving white LEDs for camera flash in smartphones and tablets with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Boost controller generating regulated 12V/300mA pulse output synchronized to camera shutter timing. Use Value: Internal MOSFET and 1.3MHz switching allow compact layout with <2mm-height magnetics, meeting strict Z-height constraints. | Use Scenario: Providing 5V or 12V auxiliary rail for USB peripherals or display backlight in PDAs and rugged handhelds. IC Role / Device Role / Timing Role: Primary step-up regulator converting 3.3V system rail to higher voltage for interface or analog subsystems. Use Value: 2.5V minimum input enables operation down to end-of-discharge battery voltage, extending usable runtime. |
| Digital Camera LCD Bias | External Modem Power |
Use Scenario: Generating positive and negative bias voltages (e.g., +12V, –5V) for small-format TFT LCD panels. IC Role / Device Role / Timing Role: Core boost stage feeding charge-pump or inverting converter; operates continuously during display active time. Use Value: 1.25V FB reference and tight load regulation (<±2%) ensure stable panel contrast and grayscale fidelity. | Use Scenario: Powering RS-232 transceivers or DSL modems from 3.3V or 5V embedded host supplies. IC Role / Device Role / Timing Role: Isolated DC-DC source delivering 12V/150mA to modem PHY layer with fast transient response. Use Value: 1.9A current limit and thermal protection prevent latch-up during line surge or cable fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | 500kHz switching, 0.5A switch current, 2.5V–6V input, 1.24V FB reference | Larger inductors required; lower frequency increases EMI filtering burden but improves light-load efficiency | Prefer when lower EMI priority outweighs board area constraints and higher-frequency noise is unacceptable |
| RT8532GJ6F | 1.2MHz switching, 2A current limit, 2.5V–5.5V input, 1.22V FB reference, QFN-6 package | Higher current capability and tighter FB tolerance (±1.5%), but no EN pin - always-on operation | Prefer when continuous boost operation is needed and enable control is unnecessary or handled externally |
Compared with TPS61040DRVR and RT8532GJ6F, MP1541DJ-LF-P offers superior integration (EN pin + thermal/UVLO + soft-start in TSOT23-5), optimal 1.3MHz frequency for miniaturization, and proven performance in flash LED and portable display applications - making it the preferred choice where size, sequencing control, and reliability under battery discharge are critical.
Availability
MP1541DJ-LF-P is available at Aetrix Electronics and suitable for camera flash circuits, handheld computer power rails, small LCD bias supplies, and external modem power stages requiring stable component supply across production lifecycles.
Supply support for MP1541DJ-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, headquartered in Kirkland, WA, with global design and support centers.
The MP1541 belongs to MPS's low-power DC-DC boost converter product line, designed specifically for space- and battery-sensitive portable electronics requiring compact, efficient, and robust voltage step-up functionality.
FAQ
What is the maximum output voltage achievable with MP1541DJ-LF-P?
The MP1541DJ-LF-P supports output voltages up to 22 V, limited by the absolute maximum rating of the SW pin (–0.3 V to 25 V). Output is set via external resistor divider on the FB pin, with regulation accuracy dependent on FB reference tolerance (±4%) and resistor matching. For stable operation above 15 V, ensure diode reverse voltage rating exceeds VOUT + 20% margin.
Does MP1541DJ-LF-P require external compensation components?
No external compensation is required for basic operation - the MP1541DJ-LF-P is internally compensated. A single 47kΩ–100kΩ resistor in series with the FB node is recommended for stability across load and input variations. Lead-lag networks are optional and only needed if phase margin falls below 45° under worst-case conditions (e.g., low-ESR ceramic output caps with heavy transient loads).
Can MP1541DJ-LF-P drive multiple white LEDs in series?
Yes - with appropriate output capacitor (≥4.7 µF ceramic) and Schottky rectifier (e.g., MBR0520 for ≤500 mA), it can drive up to 3–4 standard white LEDs (3.0–3.4 V each) in series from a 5 V input, delivering ~300 mA at ~12 V. Efficiency remains >80% under these conditions, per the datasheet efficiency curves at VIN = 5 V, VOUT = 12 V.
What is the purpose of the NC pins in the QFN-8 variant, and are they present in MP1541DJ-LF-P?
The QFN-8 variant (MP1541GG) has two NC pins (pins 6 and 7) reserved for factory use and must remain unconnected. MP1541DJ-LF-P uses the TSOT23-5 package, which has only five functional pins - no NC pins. All five pins are assigned: SW, GND, FB, EN, and IN - eliminating ambiguity in layout and assembly.
How does the internal soft-start function impact inrush current during camera flash activation?
The internal soft-start ramps the current limit from zero to full 1.9 A in three 40 µs steps (total 120 µs), limiting peak inrush to <500 mA during flash LED turn-on. This prevents input rail collapse, avoids triggering host PMIC overcurrent protection, and extends lithium battery cycle life by reducing instantaneous stress on the cell's internal impedance.
Is MP1541DJ-LF-P RoHS-compliant and lead-free?
Yes - MP1541DJ-LF-P is RoHS-compliant, lead-free, and halogen-free, as indicated by the "LF" suffix in the part number. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards without special handling.
MP1541DJ-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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):
- 6V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 22V
- Current - Output:
- 300mA
- Frequency - Switching:
- 1.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MP1541DJ-LF-P FAQ
1.How can I place an order for MP1541DJ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1541DJ-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 MP1541DJ-LF-P reliable?
The price and inventory of MP1541DJ-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 MP1541DJ-LF-P is usually 5 days.
3.What payment methods are accepted for MP1541DJ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1541DJ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1541DJ-LF-P?
MP1541DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1541DJ-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 MP1541DJ-LF-P?
For technical support, including MP1541DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1541DJ-LF-P requirements.
6.How does Aetrix verify that MP1541DJ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1541DJ-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 MP1541DJ-LF-P meets industry standards.
7.What is the process for return or replacement of MP1541DJ-LF-P?
All MP1541DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1541DJ-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 MP1541DJ-LF-P part is unused and in its original packaging.
Return procedure for MP1541DJ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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