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Monolithic Power Systems Inc. MP1540DJ-LF-Z
- Part No.:
- MP1540DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP1540DJ-LF-Z.pdf
- Description:
- IC REG BOOST ADJ 200MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,661
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Product details
Overview
MP1540DJ-LF-Z from Monolithic Power Systems is a 5-pin TSOT23-5 current-mode step-up DC/DC converter with 1.3MHz fixed switching frequency, 2.5V–6V input range, 3V–18V output capability, and integrated 0.65Ω MOSFET switch. It delivers up to 200mA at 12V from a 5V supply and features internal soft-start, UVLO (2.45V threshold), thermal shutdown (160°C), and current limiting (1.9A typical) for battery-powered flash and display backlight applications.
For engineers reviewing the MP1540DJ-LF-Z datasheet, MP1540DJ-LF-Z pinout, MP1540DJ-LF-Z application, or MP1540DJ-LF-Z equivalent, key selection criteria include its 1.25V feedback reference accuracy (±4%), 85% maximum duty cycle, 635µA quiescent current, and TSOT23-5 thermal resistance (θJA = 220°C/W), critical for compact portable power designs.
Technical Context
The MP1540DJ-LF-Z implements a peak-current-mode control architecture with a 1.3MHz oscillator and internal slope compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier compares a 1.25V bandgap reference against the FB pin voltage to regulate output via PWM duty adjustment.
It integrates a 0.65Ω N-channel MOSFET switch rated for 20V drain-source voltage, supports automatic startup when EN is tied to VIN, and uses an internal 40µs ramp-based soft-start sequence that increments current limit in three 40µs steps for controlled inrush management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.3MHz fixed - enables use of <2mm-height inductors and ceramic capacitors for ultra-thin portable designs |
| Input Voltage Range | 2.5V to 6V - supports single-cell Li-ion (3.0–4.2V), NiMH (2.4–4.8V), and USB 5V sources |
| Output Voltage Range | 3V to 18V - configurable via external resistor divider; 12V @ 200mA demonstrated in typical application |
| Feedback Reference | 1.25V ±4% - sets output accuracy; used with R1/R2 divider to scale VOUT precisely |
| Current Limit | 1.9A typical - protects internal MOSFET during overload or short-circuit; limits peak inductor current |
| Thermal Shutdown | 160°C - latches off until junction cools; prevents permanent damage under sustained overloads |
| Quiescent Current | 635µA typical - minimizes standby power draw in battery-critical systems like camera flash circuits |
Pinout & Package
MP1540DJ-LF-Z is housed in a 5-pin TSOT23-5 package (2.9mm × 1.6mm × 0.87mm, 0.95mm lead length), optimized for high thermal resistance (θJA = 220°C/W) on standard PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power Switch Drain | Drain node of internal MOSFET; connects to inductor and rectifier diode; swings from GND to up to 20V |
| 2 GND | Power Ground | Primary return path for switch current and IC bias; must be low-impedance connection to minimize noise and thermal rise |
| 3 FB | Feedback Input | Senses output via resistor divider; regulates VOUT by maintaining 1.25V at this pin; sensitive to noise-requires local filtering |
| 4 EN | Enable Control | Active-high logic input; ≥1.3V turns regulator on; ≤1.1V disables; must not float-tie to VIN if unused |
| 5 IN | Input Supply | Connects to input source; requires local 4.7µF+ ceramic bypass capacitor placed adjacent to pin to suppress ripple and EMI |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFET | 0.65Ω RDS(ON) N-channel switch eliminates external FET and reduces BOM count and board area |
| Fixed 1.3MHz Operation | Enables use of small 4.7µH–10µH inductors and 4.7µF–10µF ceramic output caps-no ferrite beads needed |
| Internal Soft-Start | 120µs ramp-up time with stepped current limit prevents input surge and output overshoot at power-on |
| UVLO with Hysteresis | 2.45V turn-on / 2.36V turn-off (92mV hysteresis) avoids oscillation near brownout thresholds |
| Thermal + Current Protection | Combines 160°C thermal shutdown and 1.9A current limit to sustain reliability under transient overloads |
Applications
| Camera Phone Flash | Handheld PDA Backlight |
|---|---|
|
Use Scenario: Driving white LEDs in mobile phone flash modules requiring 12V/200mA pulsed output from a 3.3V–4.2V battery. IC Role / Device Role / Timing Role: Step-up converter providing regulated high-voltage rail; operates in discontinuous conduction mode during brief flash pulses. Use Value: Internal soft-start and 1.3MHz switching minimize input ripple and allow compact 2mm-height magnetics-critical for slim handset form factors. |
Use Scenario: Powering small LCD backlights in PDAs and handheld terminals where input is 5V USB or single-cell Li-ion. IC Role / Device Role / Timing Role: Boost regulator generating stable 12V–15V output; uses EN pin for system-controlled on/off sequencing. Use Value: 635µA quiescent current extends battery runtime during display-active periods; TSOT23-5 footprint saves space on dense PCBs. |
| Digital Camera Display | External Modem Power |
|
Use Scenario: Supplying 12V bias to active-matrix LCD panels in compact digital still/video cameras powered by AA/AAA batteries. IC Role / Device Role / Timing Role: High-efficiency boost converter operating across 2.5V–4.5V input range; maintains regulation as battery discharges. Use Value: 85% max duty cycle and 1.25V FB reference enable precise output setting; UVLO prevents erratic behavior below 2.5V cutoff. |
Use Scenario: Generating 12V rail for RS-232 transceivers or DSL line drivers in portable modems using 5V USB input. IC Role / Device Role / Timing Role: Isolated high-side boost stage delivering clean, low-noise 12V output; EN pin synchronized with modem sleep/wake cycles. Use Value: 220°C/W θJA allows operation without heatsink at 200mA load; internal current limit protects against cable fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVT | 1.0MHz switching, 28V max output, 0.5A switch current, 2.7V min input | Higher output voltage headroom but lower efficiency at 12V/200mA due to lower fSW and higher RDS(ON) | Prefer when >15V output or >300mA load required; less suitable for space-constrained 12V flash designs |
| MAX1706ESA+ | Fixed 500kHz fSW, 28V max output, 1.2A switch current, no integrated soft-start | Larger inductor size required; lacks internal soft-start-needs external RC network for inrush control | Choose for cost-sensitive industrial applications where board area is less constrained and startup timing is externally managed |
Compared with TPS61040DRVT and MAX1706ESA+, MP1540DJ-LF-Z offers superior integration (soft-start, tighter FB tolerance), smaller solution size (1.3MHz vs 500kHz/1.0MHz), and better thermal performance in TSOT23-5-making it optimal for battery-powered consumer imaging devices.
Availability
MP1540DJ-LF-Z is available at Aetrix Electronics and suitable for camera phone flash circuits, handheld PDA displays, and external modem power supplies requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for MP1540DJ-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, headquartered in Kirkland, WA, with global design and support centers.
The MP1540 belongs to MPS's low-power DC/DC boost converter product line, designed specifically for space- and efficiency-critical portable electronics including imaging, wearables, and IoT edge sensors.
FAQ
What is the minimum input voltage required for MP1540DJ-LF-Z to start regulation?
The MP1540DJ-LF-Z has an under-voltage lockout (UVLO) threshold of 2.45V (typical) with 92mV hysteresis. Regulation begins only when VIN rises above 2.45V; below 2.36V, the device remains disabled. This ensures reliable startup from partially discharged Li-ion cells (≥3.0V) and avoids unstable operation near battery cutoff.
Can MP1540DJ-LF-Z drive a 12V, 300mA load?
No-MP1540DJ-LF-Z is rated for up to 200mA at 12V from a 5V input, as confirmed in the Typical Application section and Efficiency vs Load Current graph. Attempting 300mA exceeds the 1.9A current limit's practical duty-cycle margin and risks thermal shutdown or regulation loss due to inductor saturation or reduced efficiency.
Is an external Schottky diode mandatory for MP1540DJ-LF-Z operation?
Yes-an external Schottky diode (e.g., MBR0520L) is required. The MP1540DJ-LF-Z contains only the N-channel MOSFET switch (SW pin); it does not integrate a synchronous rectifier. The diode provides the freewheeling path during MOSFET off-time and must withstand ≥18V reverse voltage and handle peak currents up to 1.9A.
How is output voltage set on MP1540DJ-LF-Z?
VOUT is set using a resistive divider from output to FB pin and GND. With FB reference = 1.25V, R2 = 11.8kΩ (recommended), and R1 calculated as R1 = 9.44kΩ × (VOUT – 1.25V). For 12V output, R1 = 101.3kΩ (standard 100kΩ ±1% resistor yields ~11.95V).
Does MP1540DJ-LF-Z support adjustable switching frequency?
No-the MP1540DJ-LF-Z uses a factory-trimmed 1.3MHz internal oscillator with ±23% variation (1.0–1.6MHz). Frequency cannot be adjusted externally via resistor, capacitor, or pin strapping. This fixed-frequency architecture simplifies layout and EMI filtering but precludes optimization for specific noise-sensitive bands.
What is the recommended input capacitor value and type?
A minimum 4.7µF X5R/X7R ceramic capacitor with low ESR is required, placed directly between IN and GND pins. Larger values (e.g., 10µF) improve input ripple suppression and transient response. Tantalum or aluminum electrolytic capacitors are not recommended due to higher ESR and instability at 1.3MHz.
How does the EN pin behave when left unconnected?
The EN pin must never be left floating-it has 1µA input bias current and undefined logic state. If unused, it must be hard-wired to VIN for automatic startup. Leaving it open risks erratic enable/disable behavior, increased quiescent current, or failure to start due to noise coupling.
MP1540DJ-LF-Z 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:
- Obsolete
- 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):
- 18V
- Current - Output:
- 200mA
- 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
MP1540DJ-LF-Z FAQ
1.How can I place an order for MP1540DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1540DJ-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 MP1540DJ-LF-Z reliable?
The price and inventory of MP1540DJ-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 MP1540DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1540DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1540DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1540DJ-LF-Z?
MP1540DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1540DJ-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 MP1540DJ-LF-Z?
For technical support, including MP1540DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1540DJ-LF-Z requirements.
6.How does Aetrix verify that MP1540DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1540DJ-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 MP1540DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1540DJ-LF-Z?
All MP1540DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1540DJ-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 MP1540DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP1540DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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