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Monolithic Power Systems Inc. MP1475SGJ-P
- Part No.:
- MP1475SGJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1475SGJ-P.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:687
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Product details
Overview
MP1475SGJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 120mΩ high-side and 50mΩ 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×95% output voltage - deployed in notebook I/O power and flat-panel display bias rails.
For engineers reviewing the MP1475SGJ-P datasheet, MP1475SGJ-P pinout, MP1475SGJ-P application, or MP1475SGJ-P equivalent, key selection criteria include its TSOT23-8 package thermal performance (θJA = 100°C/W), power-good indicator timing (0.6ms delay), current-limit threshold (3.5A min over –40°C to +125°C), and EN/SYNC pin synchronization capability (300kHz–2MHz external clock).
Technical Context
The MP1475SGJ-P implements current-mode control with internal error amplifier referenced to 0.807V ±16mV, enabling fast transient response and simplified loop compensation. Its three operational modes - Advanced Asynchronous Modulation (AAM) at light load, Discontinuous Conduction Mode (DCM), and Continuous Conduction Mode (CCM) - dynamically adapt to output current demand while maintaining regulation.
Internal circuitry includes a 5V LDO regulator (VCC) powered from VIN, bootstrap driver with 2.2V UVLO and 5V BST clamp, and dual-stage protection: cycle-by-cycle over-current detection triggering hiccup mode upon FB < 400mV, plus thermal shutdown at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports 5V, 12V, and 15V intermediate bus architectures without external pre-regulation. |
| Output Current | 3A continuous - sustains full-rated load at TA = +85°C with proper PCB copper area and airflow. |
| Switching Frequency | Fixed 500kHz (±130kHz over temp) - enables compact 4.7µH inductor selection and balances EMI vs. efficiency trade-offs. |
| Feedback Reference | 0.807V ±16mV at TJ = +25°C - sets output voltage via resistor divider; tolerance directly impacts VOUT accuracy (e.g., ±2% at 3.3V). |
| HS/LS RDS(ON) | 120mΩ / 50mΩ - determines conduction loss at full load; combined ~170mΩ yields <120mW total FET loss at 3A. |
| Power-Good Delay | 0.6ms - ensures stable regulation before asserting PG high; critical for sequenced power-up in multi-rail systems. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during sustained overload or poor heatsinking; auto-recovery at 130°C. |
Pinout & Package
MP1475SGJ-P is housed in an 8-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density layouts with exposed thermal pad (GND-connected) and fine-pitch leads requiring controlled reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled high via external 100kΩ resistor when FB ≥ 90% of 0.807V; 0.6ms delay prevents false asserts during startup ripple. |
| 2 - IN | Main input supply connection | Accepts 4.5V–16V; requires low-ESR ceramic capacitor placed within 2mm of pin to suppress high-frequency switching noise. |
| 3 - SW | Switch node | Drives external inductor; swings from ~–0.3V (body diode drop) to VIN; demands short, wide traces and multiple vias to GND. |
| 4 - GND | System ground reference | Primary return path for power and signal currents; must connect to large copper pour with ≥6 thermal vias under exposed pad. |
| 5 - BST | Bootstrap supply for HS gate driver | Requires 0.1µF ceramic cap between BST and SW; external diode (e.g., IN4148) recommended if VIN < 5V or duty >65%. |
| 6 - EN/SYNC | Enable and external clock input | Logic-high (>1.4V) enables operation; accepts 300kHz–2MHz square wave for frequency synchronization to reduce EMI peaks. |
| 7 - VCC | Internal 5V LDO output | Powers control circuitry; decoupled with 0.1µF–0.22µF ceramic cap; avoid >0.22µF to prevent start-up instability. |
| 8 - FB | Resistor-divider feedback input | Senses output voltage; high-impedance (10–50nA bias) node requiring shortest possible trace, no vias, and guard ring to minimize noise injection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 120mΩ HS + 50mΩ LS MOSFETs eliminate external switch losses and simplify BOM - reduces component count by ≥4 vs. controller-only solutions. |
| Light-Load Efficiency | Advanced Asynchronous Modulation (AAM) skips pulses below ~300mA load - maintains >85% efficiency at 10mA output with 12VIN→3.3VOUT. |
| Robust Protection Suite | Cycle-by-cycle OCP + hiccup recovery + thermal shutdown + UVLO (3.6V rising, 700mV hysteresis) - enables unattended operation in industrial environments. |
| Flexible Output Control | Adjustable VOUT from 0.8V using resistor divider; power-good flag with programmable delay; soft-start time fixed at 1.2ms - eliminates external timing components. |
| EMI Mitigation | External clock synchronization (300kHz–2MHz) allows alignment with system clocks or spread-spectrum sources - reduces peak radiated emissions by up to 10dB. |
Applications
| Portable Computing Power | Digital Set-Top Box Rails |
|---|---|
|
Use Scenario: Generating 3.3V/2A and 1.8V/1.5A from 12V battery or adapter in ultrabook motherboard VRMs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator for CPU I/O and chipset auxiliary rails; operates in CCM at full load, transitions to DCM/AAM during sleep states. Use Value: 120mΩ/50mΩ RDS(ON) enables >92% efficiency at 2A/3.3V, reducing thermal load on compact PCBs without heatsinks. |
Use Scenario: Providing stable 5V/2A and 3.3V/1A outputs for SoC core, memory, and HDMI interface in cable/satellite STBs. IC Role / Device Role / Timing Role: Secondary point-of-load regulator synchronized to main system clock to suppress beat-frequency noise in audio/video subsystems. Use Value: EN/SYNC pin accepts 1MHz external clock - eliminates switching noise coupling into sensitive analog video DACs and RF tuners. |
| Flat-Panel Display Bias | Distributed Telecom Power |
|
Use Scenario: Supplying 12V/1.2A gate drive and 5V/0.8A logic power for LED backlight drivers and TCON in 24"–32" LCD monitors. IC Role / Device Role / Timing Role: High-voltage input buck converter operating at 12VIN→5V with 95% max duty cycle; uses BST diode assist for reliable startup. Use Value: 16V absolute max input rating tolerates 15V nominal rail transients; PG flag sequences backlight enable after stable 5V establishment. |
Use Scenario: Local 3.3V/3A conversion from 48V intermediate bus in remote radio head (RRH) baseband modules. IC Role / Device Role / Timing Role: Compact, thermally efficient step-down stage preceding LDOs; leverages TSOT23-8 footprint to fit dense FPGA/ASIC power islands. Use Value: θJA = 100°C/W allows 3A operation at +70°C ambient with 1in² 2oz copper; thermal shutdown prevents latch-up during burst traffic loads. |
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 |
|---|---|---|---|
| RT7272BGSP | Higher 20V max input, 4A rating, but larger SOP-8 package (θJA = 65°C/W); no AAM mode - fixed PFM only. | Better suited for 19V adapter inputs and higher-current loads; less optimal for ultra-low-power sleep states. | Select when input exceeds 16V or output current >3A is required; accept larger board area and reduced light-load efficiency. |
| TPS54332DR | 3.5A rating, 28V max input, external MOSFETs; requires 6 external components vs. MP1475SGJ-P's 4; no integrated PG pin. | Offers greater design flexibility for custom efficiency/thermal trade-offs but increases layout complexity and validation effort. | Choose for designs needing >16V input or field-replaceable FETs; avoid when minimizing BOM count and layout time is critical. |
Compared with RT7272BGSP and TPS54332DR, MP1475SGJ-P delivers superior integration density and light-load efficiency in a space-constrained TSOT23-8 package, making it optimal for cost-sensitive, size-limited consumer electronics where 4.5V–16V input and ≤3A output are sufficient.
Availability
MP1475SGJ-P is available at Aetrix Electronics and suitable for notebook systems, digital set-top boxes, and flat-panel television power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP1475SGJ-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP1475SGJ-P belongs to MPS's MP147x family of integrated synchronous buck converters, engineered for high-efficiency, low-noise, and compact power delivery in portable and space-constrained consumer electronics.
FAQ
What is the minimum output voltage achievable with MP1475SGJ-P?
The MP1475SGJ-P supports output voltages down to 0.8V, set by the internal 0.807V reference and external resistor divider. At 0.8V, the FB pin sees exactly the reference voltage, and regulation remains stable with proper compensation. Lower outputs require external amplification or different topology.
Can MP1475SGJ-P operate with a 3.3V input supply?
No - the absolute minimum input voltage is 4.5V per the Recommended Operating Conditions. At 3.3V, the device remains disabled due to VIN UVLO (rising threshold 3.6V–4.3V). For sub-4.5V inputs, consider the MP1495 or MP2451 families.
Is an external bootstrap diode mandatory for MP1475SGJ-P?
An external bootstrap diode (e.g., IN4148 from VCC to BST) is optional but recommended when VIN < 5V or duty cycle exceeds 65% (e.g., 12V→5V), as insufficient BST voltage causes excessive output ripple in AAM mode. It is not required for 12V→3.3V operation.
How does the EN/SYNC pin behave during power-up?
EN/SYNC must exceed 1.4V (typical) to enable operation. With a 100kΩ pull-up to VIN, startup occurs ~10µs after VIN crosses UVLO. The pin includes a 6.5V internal Zener clamp - applying >6V directly risks damage unless current-limited to <100µA.
What is the maximum allowable output capacitance on the MP1475SGJ-P FB pin?
The FB pin has no specified maximum capacitance limit, but added capacitance degrades loop stability and transient response. Layout best practice mandates shortest possible trace, no vias, and avoidance of guard rings or adjacent noisy nets - typical parasitic capacitance should remain <0.5pF.
Does MP1475SGJ-P support pre-biased output startup?
Yes - the MP1475SGJ-P features monotonic pre-bias start-up. When the output is pre-charged, the internal soft-start circuit and BST capacitor charge synchronously, preventing reverse current flow and ensuring controlled ramp-up without output voltage undershoot or overshoot.
What is the purpose of the frequency foldback feature?
When FB voltage drops below 400mV (indicating severe overload or short-circuit), the oscillator frequency folds back to ~50% of nominal (e.g., 250kHz) to reduce switching losses and thermal stress. This extends hiccup-mode survival time and improves reliability during fault conditions.
MP1475SGJ-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:
- Active
- 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
MP1475SGJ-P FAQ
1.How can I place an order for MP1475SGJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1475SGJ-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 MP1475SGJ-P reliable?
The price and inventory of MP1475SGJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1475SGJ-P is usually 5 days.
3.What payment methods are accepted for MP1475SGJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1475SGJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1475SGJ-P?
MP1475SGJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1475SGJ-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 MP1475SGJ-P?
For technical support, including MP1475SGJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1475SGJ-P requirements.
6.How does Aetrix verify that MP1475SGJ-P is sourced from the original manufacturer or authorized distributors?
All MP1475SGJ-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 MP1475SGJ-P meets industry standards.
7.What is the process for return or replacement of MP1475SGJ-P?
All MP1475SGJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1475SGJ-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 MP1475SGJ-P part is unused and in its original packaging.
Return procedure for MP1475SGJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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