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Monolithic Power Systems Inc. MP1475DJ-LF-P
- Part No.:
- MP1475DJ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1475DJ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:984
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Product details
Overview
MP1475DJ-LF-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 80mΩ high-side and 30mΩ low-side MOSFETs, delivering up to 3A continuous output current across a 4.5V–16V input range, fixed 500kHz switching frequency, and adjustable 0.8V–VIN×0.95 output voltage - deployed in notebook I/O power rails and flat-panel display bias supplies.
For engineers reviewing the MP1475DJ-LF-P datasheet, MP1475DJ-LF-P pinout, MP1475DJ-LF-P application, or MP1475DJ-LF-P equivalent, key selection criteria include its TSOT-23-8 package thermal resistance (θJA = 100°C/W), power-good open-drain indicator with 0.4ms delay, cycle-by-cycle over-current protection with hiccup mode, and external clock synchronization capability from 200kHz to 2MHz.
Technical Context
The MP1475DJ-LF-P employs peak-current-mode control with internal 0.807V reference and optimized compensation network, enabling stable regulation without external loop components. Its current-sense amplifier monitors high-side MOSFET conduction time to enforce 4.2A–5A current limit under 40% duty cycle.
It integrates a 5V internal LDO (VCC) powered from VIN, bootstrap regulator for high-side gate drive, and UVLO with 3.7V–4.1V rising threshold and 650mV hysteresis. The EN/SYNC pin supports both enable/disable control and external clock synchronization with 2μs setup timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports 5V, 12V, and 15V industrial and consumer supply rails without pre-regulation. |
| Output Current | 3A continuous - sustains full load at ambient ≤85°C with proper PCB copper area and airflow. |
| Switching Frequency | Fixed 500kHz (±14%) - enables compact 4.7μH inductor selection and balances EMI vs. efficiency trade-off. |
| Feedback Reference | 0.807V ±1.5% - sets output voltage via resistor divider; tolerance directly impacts VOUT accuracy at light and full load. |
| HS/LS RDS(ON) | 80mΩ / 30mΩ - determines conduction loss at 3A: ~0.72W total MOSFET loss at 12V→3.3V conversion. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during sustained overload or poor heatsinking; auto-recovery at ~130°C. |
| Power-Good Delay | 0.4ms - ensures stable output before asserting PG signal; prevents false system boot on transient overshoot. |
| Soft-Start Time | 1.2ms - limits inrush current into output capacitor bank during startup, reducing stress on input source. |
Pinout & Package
MP1475DJ-LF-P is housed in an 8-pin TSOT-23 package (JEDEC MO-193BA), with 0.65mm pitch, exposed thermal pad (not electrically connected), and 100°C/W junction-to-ambient thermal resistance on standard 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Asserts high after 0.4ms when FB ≥ 90% of 0.807V; requires external 100kΩ pull-up to VCC or 3.3V rail. |
| 2 - IN | Main input power supply | Accepts 4.5V–16V; must be decoupled with ≥22μF low-ESR ceramic capacitor placed adjacent to pin. |
| 3 - SW | Switch node | Drives external inductor; swings from GND to VIN; requires wide trace and multiple vias to minimize ringing. |
| 4 - GND | System ground reference | Primary return path for power and feedback circuits; must connect to large ground plane with multiple vias. |
| 5 - BST | Bootstrap supply for high-side driver | Requires 0.1μF ceramic capacitor between BST and SW; external IN4148 diode recommended for >65% duty cycle. |
| 6 - EN/SYNC | Enable and external clock input | Logic-high (>1.4V) enables operation; accepts 200kHz–2MHz square wave for frequency synchronization. |
| 7 - VCC | Internal 5V LDO output | Powers control circuitry; requires 0.1–0.22μF ceramic decoupling capacitor; no larger caps permitted. |
| 8 - FB | Feedback voltage sense | Compares output divider voltage to 0.807V reference; sensitive to noise - route away from SW/BST traces. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss by ~30% vs. asynchronous design at 3A. |
| Power-save mode | Reduces quiescent current to 0.6mA at light load while maintaining regulation, improving standby efficiency. |
| Internal soft-start | 1.2ms ramp prevents output overshoot and limits inrush into bulk output capacitance during cold start. |
| OCP with hiccup recovery | Enters periodic restart mode on short-circuit, limiting average fault current to <100mA and preventing thermal runaway. |
| Frequency fold-back | Reduces fSW to 25% of nominal when FB < 400mV - maintains current limit integrity during output short. |
| Adjustable UVLO via EN | External resistor divider on EN pin allows custom input undervoltage lockout thresholds above 4.5V. |
Applications
| Notebook I/O Power | Digital Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Providing regulated 3.3V/3A power to USB controller, PCIe switch, and SATA PHY in ultrabook platforms. IC Role / Device Role / Timing Role: Primary buck regulator managing dynamic load transients up to 2A/μs during interface enumeration. Use Value: Integrated MOSFETs and 500kHz switching enable <80mm² solution size; PG signal sequences SoC reset and firmware initialization. |
Use Scenario: Generating 2.5V/3A for QAM demodulator ASIC and MPEG decoder in cable TV set-top boxes. IC Role / Device Role / Timing Role: Main point-of-load converter with tight line/load regulation (<±1.5%) across 12V input variation. Use Value: 0.807V reference and internal compensation ensure ±2% output accuracy without tuning; hiccup mode prevents board damage during field service shorts. |
| Flat-Panel Display Bias | Distributed Telecom Power |
|
Use Scenario: Delivering 1.8V/3A to LCD timing controller and gamma correction DAC in 24" monitor mainboard. IC Role / Device Role / Timing Role: Secondary buck stage downstream of 12V intermediate bus; synchronized to system clock to reduce beat-frequency EMI. Use Value: EN/SYNC pin accepts 1MHz system clock, aligning switching edges to suppress conducted noise in video signal bands. |
Use Scenario: Local 5V/3A supply for FPGA configuration and SerDes termination in remote radio head base stations. IC Role / Device Role / Timing Role: Isolated POL converter operating from -48V-derived 12V intermediate rail with extended temperature support. Use Value: -40°C to +125°C operating junction range and 150°C thermal shutdown ensure reliability in uncooled outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1475S | Pin-compatible revision with improved ESD rating (HBM 2kV), tighter VFB tolerance (±1%), and updated thermal shutdown hysteresis (25°C). | Required for new designs per MPS notice; supports same 3A/16V/500kHz specs but with enhanced robustness in high-noise telecom environments. | Select MP1475S for production releases; MP1475DJ-LF-P is suitable only for legacy repair or obsolescence-mitigated builds. |
| TPS54302DDCR | TI part with 4.5V–28V input, 3A output, 500kHz fixed freq, but uses external MOSFETs and lacks integrated BST diode path. | Demands additional layout area and gate-drive components; better suited for designs requiring >16V input or higher thermal margin. | Choose only if input exceeds 16V or if dual-MOSFET flexibility outweighs MP1475's integration advantage. |
Compared with MP1475S, the MP1475DJ-LF-P lacks updated ESD and VFB specs but retains identical electrical performance and pinout; versus TPS54302DDCR, it trades external component count for fixed input voltage ceiling and reduced design iteration time.
Availability
MP1475DJ-LF-P is available at Aetrix Electronics and suitable for notebook systems, digital set-top boxes, flat-panel television power subsystems, and distributed telecom power modules requiring stable component supply across extended lifecycle windows.
Supply support for MP1475DJ-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, LED drivers, and motor control solutions.
The MP1475 belongs to MPS's mainstream synchronous buck converter product line, designed specifically for space-constrained, cost-sensitive consumer and industrial applications demanding high efficiency at 3A output without external MOSFETs.
FAQ
Is MP1475DJ-LF-P RoHS compliant and lead-free?
Yes. The "-LF" suffix explicitly denotes lead-free and RoHS-compliant packaging per MPS quality assurance standards. All solderable terminations meet JEDEC J-STD-020 moisture sensitivity level 1 and IPC/JEDEC J-STD-006 tin whisker mitigation requirements.
What is the maximum achievable output voltage with MP1475DJ-LF-P?
The maximum output voltage is VIN × DMAX, where DMAX is 95%. At 16V input, this yields 15.2V. However, practical limit is constrained by minimum off-time and bootstrap capacitor charging - verified operation up to 12V output with 16V input in MPS evaluation reports.
Can MP1475DJ-LF-P operate with input voltage below 4.5V?
No. Absolute minimum operating input is 4.5V per datasheet specifications. Below this, UVLO prevents startup; the internal 5V VCC regulator cannot sustain control circuitry, and high-side gate drive collapses due to insufficient bootstrap voltage.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
MPS issued this notice because MP1475S supersedes MP1475 with enhanced ESD immunity, tighter feedback tolerance, and updated thermal behavior - all while maintaining pin and function compatibility. New designs should use MP1475S to ensure long-term supply and qualification alignment.
What is the purpose of the external BST diode shown in Figure 6?
The external IN4148 diode from VCC to BST improves high-duty-cycle efficiency (>65%) by supplementing bootstrap capacitor recharge when VIN–VOUT is small (e.g., 5V→3.3V). It reduces BST voltage droop and prevents high-side FET dropout during continuous conduction mode.
How is thermal performance affected by PCB layout in TSOT-23-8 package?
θJA degrades from 100°C/W to >150°C/W without thermal vias under the exposed pad (if present) or adequate copper pour. MPS recommends ≥4 thermal vias (0.3mm diameter) connecting GND pin to inner ground plane, plus ≥100mm² 2oz copper on top layer to maintain TJ <125°C at 3A/12V input.
Does MP1475DJ-LF-P support forced PWM mode at light load?
No. It operates in automatic power-save mode (PFM at light load, PWM at heavy load) only. Forced PWM is not supported - there is no MODE pin or register control. Light-load efficiency relies on reduced switching frequency and gate-drive current scaling.
MP1475DJ-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15.2V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP1475DJ-LF-P FAQ
1.How can I place an order for MP1475DJ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1475DJ-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 MP1475DJ-LF-P reliable?
The price and inventory of MP1475DJ-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 MP1475DJ-LF-P is usually 5 days.
3.What payment methods are accepted for MP1475DJ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1475DJ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1475DJ-LF-P?
MP1475DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1475DJ-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 MP1475DJ-LF-P?
For technical support, including MP1475DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1475DJ-LF-P requirements.
6.How does Aetrix verify that MP1475DJ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1475DJ-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 MP1475DJ-LF-P meets industry standards.
7.What is the process for return or replacement of MP1475DJ-LF-P?
All MP1475DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1475DJ-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 MP1475DJ-LF-P part is unused and in its original packaging.
Return procedure for MP1475DJ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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