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Monolithic Power Systems Inc. MP2104DJ-1.5-LF-P
- Part No.:
- MP2104DJ-1.5-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP2104DJ-1.5-LF-P.pdf
- Description:
- IC REG BUCK 1.5V 600MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,777
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Product details
Overview
MP2104DJ-1.5-LF-P from Monolithic Power Systems is a 1.7MHz, 600mA synchronous step-down DC/DC converter in TSOT23-5 package with fixed 1.5V output, 2.5V–6V input range, and 100% duty-cycle capability for low-dropout operation in Li+-powered portable systems.
For engineers reviewing the MP2104DJ-1.5-LF-P datasheet, MP2104DJ-1.5-LF-P pinout, MP2104DJ-1.5-LF-P application, or MP2104DJ-1.5-LF-P equivalent, key selection criteria include fixed-output accuracy (±3%), thermal shutdown at 145°C, <0.1μA shutdown current, integrated PFET/NFET switches, and compatibility with compact 10μH inductors and ceramic capacitors.
Technical Context
The MP2104DJ-1.5-LF-P employs constant-frequency current-mode PWM control with slope compensation to ensure stability across 0–600mA load and >50% duty cycles. Its internal 0.6V reference feeds a precision feedback comparator that regulates output via an integrated resistor divider.
It integrates a 0.44Ω PFET main switch and 0.29Ω NFET synchronous rectifier, enabling high-efficiency conversion without external diodes. The EN pin provides logic-level enable/disable with 0.3V/1.5V thresholds, and SW node supports fast transient response with minimal layout-sensitive ringing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% over –40°C to +85°C - ensures stable core supply for low-voltage microcontrollers without external feedback resistors. |
| Switching Frequency | 1.7MHz (typ.) - enables use of small 10μH inductors and 4.7μF input/output ceramics, reducing board area in space-constrained portable designs. |
| Max Load Current | 600mA continuous - sufficient for single-core DSPs, camera ISPs, or Bluetooth SoCs powered from 2.5–6V sources including single-cell Li+. |
| Input Voltage Range | 2.5V to 6V - supports direct connection to Li+ batteries (2.8–4.2V), USB ports (5V), or regulated 3.3V rails without pre-regulation. |
| Shutdown Current | <0.1μA - minimizes battery drain during system sleep modes in always-on sensors or wearable devices. |
| Duty Cycle Range | 0–100% - maintains regulation down to VIN = VOUT + ILOAD × RDS(on), critical for brownout resilience in battery-powered edge nodes. |
| Thermal Shutdown | 145°C trip point - protects die integrity under sustained overload or poor PCB thermal design while allowing full rated power at +85°C ambient. |
Pinout & Package
MP2104DJ-1.5-LF-P uses the 5-pin TSOT23-5 package (1.0mm height, 2.9mm × 1.6mm footprint) with exposed pad not present - thermal path relies on copper pour under pins 2 (GND) and 4 (IN).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | EN | Logic-enable input: ≥1.5V activates regulator; ≤0.3V forces shutdown with sub-0.1μA quiescent draw. |
| 2 | GND | Power and signal ground reference - must connect to low-impedance PCB ground plane to stabilize feedback and limit SW noise coupling. |
| 3 | SW | Switch node connecting internal PFET drain and NFET source - requires short, low-inductance trace to inductor to minimize EMI and voltage spikes. |
| 4 | IN | Input supply rail - bypassed with ≥2.2μF X5R/X7R ceramic capacitor placed within 2mm of pin to suppress switching transients. |
| 5 | OUT | Fixed-output sense pin - connects internally to 1.5V divider; no external resistors needed, eliminating tuning error and BOM cost. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.44Ω PFET + 0.29Ω NFET eliminates Schottky loss, enabling >92% efficiency at 3.3V→1.5V/300mA without heatsinking. |
| Current-mode control | Slope-compensated architecture delivers inherent cycle-by-cycle current limiting and stable loop response across 10:1 load range. |
| Short-circuit protection | Reduces oscillator frequency and lowers PFET current limit during fault, limiting peak SW current to ≤0.7A and preventing thermal runaway. |
| Low dropout operation | 100% duty cycle allows VIN as low as 1.55V (at 600mA) while maintaining regulation - extends usable battery life in deep discharge. |
| Thermal fault protection | Internal sensor disables switching at 145°C junction temperature and auto-restarts after cooldown, ensuring robustness in sealed enclosures. |
Applications
| Smartphone Application Processor Core Supply | Digital Camera Image Signal Processor (ISP) Rail |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 1.5V at up to 500mA during burst processing. IC Role / Device Role / Timing Role: Primary buck regulator delivering low-noise, fast-transient 1.5V from shared 3.7V Li+ battery rail. Use Value: Fixed 1.5V output eliminates feedback resistor tolerance errors; 1.7MHz switching avoids AM radio band interference. |
Use Scenario: Supplies image sensor ISP logic and ADC bias in compact digital still/video cameras. IC Role / Device Role / Timing Role: Dedicated point-of-load converter providing clean 1.5V from 4.2V battery, synchronized to frame capture timing. Use Value: <0.1μA shutdown current preserves battery between shots; 100% duty cycle sustains output during battery sag below 2.0V. |
| Bluetooth Low Energy (BLE) SoC System Rail | Portable Medical Sensor Front-End |
|
Use Scenario: Generates 1.5V system voltage for Nordic nRF52/nRF53-family BLE SoCs in wearables and beacons. IC Role / Device Role / Timing Role: Efficient step-down regulator supporting intermittent transmit bursts and ultra-low-power sleep states. Use Value: 600mA rating covers peak TX current (≈20mA); 1.7MHz frequency allows tiny passive components fitting <10mm² PCB area. |
Use Scenario: Powers analog front-end (AFE) and microcontroller in handheld pulse oximeters or glucose meters. IC Role / Device Role / Timing Role: Single-chip power solution converting 3.0–4.2V Li+ to precise 1.5V for low-drift op-amps and SAR ADC references. Use Value: ±3% output accuracy ensures consistent AFE gain calibration; thermal shutdown prevents measurement drift during extended use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | 1.8V fixed output, 2.05–6V input, 600mA, 3.6MHz switching - higher frequency enables smaller inductors but increases light-load losses. | Requires redesign for 1.5V systems; unsuitable where 1.5V is mandated by SoC spec (e.g., certain FPGA I/O banks). | Select only if board space is more constrained than voltage tolerance, and 1.8V is acceptable for target load. |
| Analog Devices ADP2301AUJZ-1.5-R7 | 1.5V fixed output, 3–20V input, 600mA, 700kHz switching - wider VIN range but lower frequency demands larger magnetics and higher ripple. | Better for industrial 12V input, worse for Li+ due to 3V minimum VIN - cannot operate below battery's 2.8V discharge knee. | Choose only for multi-rail systems where same part serves 5V/12V inputs; avoid for single-cell battery designs. |
Compared with TPS62231DRYR and ADP2301AUJZ-1.5-R7, MP2104DJ-1.5-LF-P uniquely balances 1.5V precision, 2.5V start-up, 1.7MHz optimization for Li+ form factors, and sub-μA shutdown - making it the most direct fit for portable 1.5V core rails.
Availability
MP2104DJ-1.5-LF-P is available at Aetrix Electronics and suitable for smartphone processor core supplies, digital camera ISP rails, BLE SoC system rails, and portable medical sensor front-ends requiring stable component supply across production lifecycles.
Supply support for MP2104DJ-1.5-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, Washington, with global design and support centers.
The MP2104 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for space- and efficiency-critical portable electronics powered by single-cell Li+ batteries.
FAQ
What is the maximum allowable input voltage for MP2104DJ-1.5-LF-P?
The absolute maximum input voltage is +6.5V, but the recommended operating range is 2.5V to 6V. Operation above 6V risks permanent damage to the internal PFET and may trigger immediate thermal shutdown. For 5V USB-powered applications, no additional clamping is required as long as transient spikes remain below 6.5V.
Does MP2104DJ-1.5-LF-P require external feedback resistors?
No. Unlike adjustable versions (MP2104DJ), the MP2104DJ-1.5-LF-P integrates a precision resistor divider to fix the output at 1.5V. Pin 5 (OUT) connects directly to this internal network - no external components are needed, reducing BOM count and layout sensitivity.
Can MP2104DJ-1.5-LF-P operate with a 2.5V input and deliver full 600mA at 1.5V?
Yes, but with reduced efficiency and elevated thermal stress. At VIN = 2.5V, the 100% duty cycle mode engages, and conduction losses rise due to PFET RDS(on) (0.44Ω). Full 600mA is achievable, but junction temperature must stay below 145°C - verified with ≥100mm² 1oz copper pour under GND and IN pins.
What is the purpose of the EN pin, and what logic levels activate the device?
The EN pin controls startup and shutdown. Driving EN ≥1.5V (with ≥10μA sink capability) enables regulation; driving EN ≤0.3V disables switching and reduces quiescent current to <0.1μA. No pull-up is required - the internal bias ensures default-off behavior when left floating.
Is MP2104DJ-1.5-LF-P RoHS-compliant and lead-free?
Yes. The "-LF" suffix explicitly denotes lead-free (Pb-free) construction per JEDEC J-STD-609, with NiPdAu terminal finish. It meets RoHS Directive 2011/65/EU and REACH SVHC requirements, and is compatible with standard SnAgCu reflow profiles (peak 260°C).
How does the MP2104DJ-1.5-LF-P handle short-circuit conditions?
Under output short, the device reduces switching frequency and lowers the PFET current limit from 1.0A (typ.) to ~0.7A, limiting peak inductor current and average power dissipation. Once the short is removed and FB voltage recovers to 0.6V, normal operation resumes automatically without latch-off or manual reset.
What inductor value is recommended for optimal efficiency at 3.3V input and 1.5V/300mA output?
A 4.7μH to 10μH shielded power inductor with DCR <200mΩ and saturation current ≥800mA is recommended. Coilcraft LP1704-472M (4.7μH, 0.09Ω, 1.5A) achieves >93% efficiency at 300mA and fits the 2.9mm × 1.6mm TSOT23-5 footprint constraints.
MP2104DJ-1.5-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:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.7MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MP2104DJ-1.5-LF-P FAQ
1.How can I place an order for MP2104DJ-1.5-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2104DJ-1.5-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 MP2104DJ-1.5-LF-P reliable?
The price and inventory of MP2104DJ-1.5-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 MP2104DJ-1.5-LF-P is usually 5 days.
3.What payment methods are accepted for MP2104DJ-1.5-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2104DJ-1.5-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2104DJ-1.5-LF-P?
MP2104DJ-1.5-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2104DJ-1.5-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 MP2104DJ-1.5-LF-P?
For technical support, including MP2104DJ-1.5-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2104DJ-1.5-LF-P requirements.
6.How does Aetrix verify that MP2104DJ-1.5-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2104DJ-1.5-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 MP2104DJ-1.5-LF-P meets industry standards.
7.What is the process for return or replacement of MP2104DJ-1.5-LF-P?
All MP2104DJ-1.5-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2104DJ-1.5-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 MP2104DJ-1.5-LF-P part is unused and in its original packaging.
Return procedure for MP2104DJ-1.5-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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