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Monolithic Power Systems Inc. MP1475SGJ-Z
- Part No.:
- MP1475SGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1475SGJ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
MP1475SGJ-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC integrating 120mΩ high-side and 50mΩ low-side MOSFETs, delivering up to 3A continuous output current with fixed 500kHz switching frequency, 0.807V feedback reference, and power-good indicator - used in notebook I/O power rails where compact 8-pin TSOT23 footprint and input range of 4.5V–16V are critical.
For engineers reviewing the MP1475SGJ-Z datasheet, MP1475SGJ-Z pinout, MP1475SGJ-Z application, or MP1475SGJ-Z equivalent, key selection criteria include verified thermal shutdown (150°C), EN/SYNC dual-function pin behavior, BST bootstrap capacitor requirements, and confirmed 3.7A current limit at +25°C under 40% duty cycle.
Technical Context
The MP1475SGJ-Z implements current-mode control with internal error amplifier referenced to 0.807V, enabling fast transient response and simplified loop compensation. Its three operational modes - Advanced Asynchronous Modulation (AAM) for light-load efficiency, Discontinuous Conduction Mode (DCM), and Continuous Conduction Mode (CCM) - dynamically adapt to load from <100mA to 3A.
It integrates a 5V internal LDO (VCC) powered from VIN, a 0.6ms-delay open-drain Power Good (PG) output, and a 6.5V Zener-clamped EN/SYNC pin supporting external clock synchronization from 300kHz to 2MHz. Bootstrap charging uses an internal floating regulator with UVLO (2.2V rising threshold) and optional external diode support for low-VIN or high-duty-cycle operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports 5V, 12V, and 15V intermediate bus systems without external pre-regulation |
| Output Current | 3A continuous - validated across -40°C to +125°C junction temperature with thermal shutdown protection |
| Switching Frequency | Fixed 500kHz (±13%) - enables compact magnetics; synchronizable to 300kHz–2MHz external clock |
| Feedback Reference | 0.807V ±1.5% - sets output voltage via resistor divider; enables 0.8V minimum adjustable output |
| HS/LS RDS(ON) | 120mΩ / 50mΩ - reduces conduction loss; achieves >92% peak efficiency at 12VIN/3.3VOUT/2A |
| Current Limit | 3.7A (typ, +25°C) - cycle-by-cycle over-current protection triggers hiccup mode during sustained short-circuit |
| Thermal Shutdown | 150°C with 20°C hysteresis - automatically recovers at ~130°C; prevents permanent die damage |
Pinout & Package
MP1475SGJ-Z is housed in an 8-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density PCB layouts with exposed thermal pad (GND-connected) and fine-pitch leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Power Good Indicator | Open-drain output pulled high after 0.6ms when FB ≥ 90% of 0.807V; pulled low when FB ≤ 85% - enables system power sequencing and fault monitoring |
| 2 (IN) | Main Input Supply | Accepts 4.5V–16V; powers internal MOSFETs and regulators; requires low-ESR ceramic decoupling placed adjacent to pin |
| 3 (SW) | Switch Node | Drives external inductor; swings from GND to VIN during HS-FET on-time; connects to BST capacitor and inductor |
| 4 (GND) | System Ground Reference | Primary ground return for power path and control circuitry; must be connected to large copper pour with multiple vias |
| 5 (BST) | Bootstrap Supply | Provides floating gate drive for HS-FET; requires 0.1μF–1μF capacitor between BST and SW; optional IN4148 diode from VCC if VIN < 5V or duty > 65% |
| 6 (EN/SYNC) | Enable & Clock Input | Digital enable (1.4V typical rising threshold); also accepts 300kHz–2MHz external clock signal synchronized to rising edge |
| 7 (VCC) | Internal 5V LDO Output | Supplies control logic and drivers; requires 0.1μF–0.22μF ceramic decoupling; not externally loaded beyond 5mA |
| 8 (FB) | Feedback Input | Monitors output via resistor divider; internal 10–50nA bias current; sensitive to noise - trace must be short, no vias |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 120mΩ HS + 50mΩ LS MOSFETs eliminate external switch losses and reduce BOM count by two devices |
| Three-Mode Efficiency Control | AAM (light-load), DCM (mid-load), CCM (full-load) - maintains >85% efficiency from 10mA to 3A at 12VIN/3.3VOUT |
| Programmable UVLO | Configurable input under-voltage lockout using external resistors on EN/SYNC - supports custom start/stop thresholds above 4.5V |
| Pre-Biased Start-Up | Monotonic startup into pre-biased outputs - avoids reverse current flow and ensures safe power sequencing in multi-rail systems |
| Robust Fault Protection | Cycle-by-cycle OCP, hiccup-mode recovery, thermal shutdown (150°C), and internal soft-start (1.2ms) - eliminates need for external supervision circuits |
Applications
| Notebook I/O Power | Digital Set-Top Box SoC Core |
|---|---|
Use Scenario: Supplies 1.8V/2A or 3.3V/3A to USB controllers, PCIe switches, and display interface ICs in ultrabooks with strict board area constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load steps up to 2A/μs while maintaining <±1% output regulation. Use Value: TSOT23-8 footprint saves >30% PCB area vs. SOIC-8 alternatives; AAM mode extends battery runtime during idle states. | Use Scenario: Powers ARM-based media processor cores (e.g., Broadcom BCM72xx) requiring tightly regulated 1.1V/2.5A with low noise and fast transient response. IC Role / Device Role / Timing Role: Core voltage regulator with PG signaling to SoC reset controller; synchronized to system clock to minimize EMI. Use Value: 500kHz fixed frequency avoids audible noise; 0.807V reference enables precise core voltage tuning within ±20mV tolerance. |
| Flat-Panel Monitor Logic Supply | Distributed Telecom Power |
Use Scenario: Generates 5V/2A for timing controllers (TCON), backlight drivers, and HDMI receiver ICs in 24–32″ LCD monitors. IC Role / Device Role / Timing Role: Secondary buck stage stepping down 12V intermediate bus; coordinated with primary AC/DC supply via PG handshake. Use Value: Wide 4.5V–16V input accommodates brownout conditions; thermal shutdown prevents latch-up during ambient >70°C operation. | Use Scenario: Provides isolated 3.3V/3A for FPGA configuration, PHY transceivers, and management MCU in 48V-powered telecom line cards. IC Role / Device Role / Timing Role: Point-of-load regulator with EN/SYNC pin tied to system supervisor for hot-swap sequencing and fault isolation. Use Value: Synchronization capability aligns switching edges across multiple rails to reduce conducted EMI peaks by >10dB. |
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 |
|---|---|---|---|
| MP2451DT-LF-Z | 3A rated, 2MHz fixed frequency, 4.5V–36V input, no PG pin, 0.8V reference | Better suited for higher-input industrial rails; lacks power-good signaling and thermal hysteresis spec | Select when input exceeds 16V or higher switching frequency is required; verify absence of PG does not impact system sequencing |
| TPS54332DR | 3A, 570kHz, 3.5V–28V input, integrated 110mΩ/70mΩ FETs, 0.8V reference, no sync capability | Higher max input voltage; lower light-load efficiency due to lack of AAM mode; TI's WEBENCH support available | Choose for designs needing broader input range or TI ecosystem integration; accept ~3% lower efficiency below 100mA load |
Compared with MP1475SGJ-Z, MP2451DT-LF-Z trades PG functionality and thermal hysteresis for extended input range and higher frequency, while TPS54332DR offers wider VIN but sacrifices light-load efficiency and clock synchronization - making MP1475SGJ-Z optimal for space-constrained 12V systems requiring robust sequencing and thermal margin.
Availability
MP1475SGJ-Z is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box SoC core supplies, and flat-panel monitor logic rails requiring stable component supply, full production traceability, and long-term lifecycle assurance.
Supply support for MP1475SGJ-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP1475SGJ-Z belongs to MPS's high-efficiency synchronous buck converter product line, engineered for compact, thermally robust DC-DC conversion in consumer and computing applications where board space, efficiency across load range, and reliable fault handling are prioritized.
FAQ
What is the maximum recommended output current for MP1475SGJ-Z under continuous operation?
The MP1475SGJ-Z delivers 3A continuous output current across its full operating temperature range (-40°C to +125°C junction), verified with thermal shutdown activation at 150°C and derating curves confirming 3A capability at 25°C ambient with standard 4-layer PCB layout and 1.25W power dissipation limit.
Can MP1475SGJ-Z operate with an input voltage below 4.5V?
No - the absolute minimum operating input voltage is 4.5V per datasheet specifications. Below this, UVLO disables the device. While the absolute maximum rating allows VIN down to -0.3V, functional operation is not guaranteed below 4.5V, and VCC regulation fails below ~4.2V, causing undefined behavior in control circuitry.
Is an external bootstrap diode required for MP1475SGJ-Z?
An external bootstrap diode (e.g., IN4148) is optional but recommended when VIN < 5V or duty cycle exceeds 65% (e.g., 12V→3.3V), as insufficient BST voltage causes excessive output ripple in light-load AAM mode. The internal bootstrap circuit functions reliably under nominal 12V→5V or 12V→3.3V conditions without it.
How does the EN/SYNC pin behave during external clock synchronization?
When an external clock (300kHz–2MHz) is applied to EN/SYNC, the internal oscillator synchronizes to its rising edge - disabling internal clock generation. The pin retains enable functionality: logic-high (>1.4V) enables regulation; logic-low (<1.25V) forces shutdown. Internal 1MΩ pull-down ensures safe default-off state if left floating.
What is the purpose of the 0.6ms delay in the Power Good (PG) signal?
The 0.6ms delay ensures stable output regulation before asserting PG high - preventing false system wake-up during startup overshoot or transient settling. It begins timing once FB reaches 90% of 0.807V and guarantees the output has settled within ±1% before signaling readiness to downstream logic or microcontrollers.
Does MP1475SGJ-Z support pre-biased output startup?
Yes - MP1475SGJ-Z features monotonic pre-biased start-up. When the output is already biased at power-on, the internal circuitry refreshes BST voltage and charges the soft-start capacitor without forcing reverse current through the inductor, ensuring safe, controlled ramp-up even into partially powered systems.
What is the minimum recommended output capacitor ESR for stable operation?
No minimum ESR is required - the MP1475SGJ-Z is optimized for low-ESR ceramic capacitors (X5R/X7R). Stability is maintained across a wide ESR range (0.5mΩ to 100mΩ) and capacitance values (10μF to 220μF), as confirmed by internal compensation network design and application note AN032 validation testing.
MP1475SGJ-Z 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-Z FAQ
1.How can I place an order for MP1475SGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1475SGJ-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 MP1475SGJ-Z reliable?
The price and inventory of MP1475SGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1475SGJ-Z is usually 5 days.
3.What payment methods are accepted for MP1475SGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1475SGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1475SGJ-Z?
MP1475SGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1475SGJ-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 MP1475SGJ-Z?
For technical support, including MP1475SGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1475SGJ-Z requirements.
6.How does Aetrix verify that MP1475SGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP1475SGJ-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 MP1475SGJ-Z meets industry standards.
7.What is the process for return or replacement of MP1475SGJ-Z?
All MP1475SGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1475SGJ-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 MP1475SGJ-Z part is unused and in its original packaging.
Return procedure for MP1475SGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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