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Monolithic Power Systems Inc. MP1475DJ-LF-Z
- Part No.:
- MP1475DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1475DJ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:6,035
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Product details
Overview
MP1475DJ-LF-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 80mΩ/30mΩ 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, flat-panel TV supplies, and distributed power rails.
For engineers reviewing the MP1475DJ-LF-Z datasheet, MP1475DJ-LF-Z pinout, MP1475DJ-LF-Z application, or MP1475DJ-LF-Z equivalent, key selection criteria include its TSOT-23-8 package thermal performance (θJA = 100°C/W), internal 5V VCC LDO regulation, power-good open-drain indicator with 0.4ms delay, and hiccup-mode over-current protection triggered at 4.2A typical current limit.
Technical Context
The MP1475DJ-LF-Z operates in peak-current-mode control with a fixed 500kHz oscillator, supporting external synchronization from 200kHz to 2MHz. Its internal error amplifier compares FB voltage to a 0.807V reference and drives a COMP node to regulate duty cycle via on-time control logic.
It integrates high-side and low-side MOSFET drivers with bootstrap charging (BST pin), internal 5V VCC LDO powered from VIN, and a dedicated PG open-drain output that asserts after 0.4ms when FB exceeds 90% of VREF - all implemented in a thermally optimized TSOT-23-8 package with exposed pad for enhanced heat dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports wide industrial and consumer input rails including 5V, 12V, and 15V bus systems. |
| Output Current | 3A continuous - sufficient for powering core logic, DDR memory, or FPGA I/O rails without external current boosting. |
| Switching Frequency | Fixed 500kHz (±14%) - enables compact magnetics (e.g., 4.7μH inductor) while balancing efficiency and EMI. |
| Feedback Reference | 0.807V ±1.5% - sets precise output voltage via external resistor divider; supports down to 0.8V output. |
| Current Limit | 4.2A typical - provides robust short-circuit protection with hiccup recovery to limit average fault current. |
| Thermal Shutdown | 150°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Power-Good Delay | 0.4ms - ensures stable output before signaling system controller, avoiding premature boot sequencing. |
Pinout & Package
MP1475DJ-LF-Z is housed in an 8-pin TSOT-23 package with exposed thermal pad (pin 4 GND connected internally to pad), optimized for high-power density and thermal management in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Power-Good Open-Drain Output | Asserts high (via external pull-up) only when regulated output reaches ≥90% of target; 0.4ms delay prevents false triggering during transients. |
| 2 (IN) | Main Input Supply Rail | Accepts 4.5V–16V; powers internal MOSFETs and VCC LDO; requires local low-ESR ceramic decoupling (e.g., 22μF). |
| 3 (SW) | Switch Node | Connects to inductor and BST capacitor; swings from GND to VIN during operation; demands short, wide PCB routing to minimize ringing. |
| 4 (GND) | System Ground Reference | Primary return path for power and control circuits; must be tied directly to thermal pad for optimal θJA and noise immunity. |
| 5 (BST) | Bootstrap Capacitor Terminal | Forms floating supply for high-side driver; requires 0.1μF–1μF ceramic cap between BST and SW pins. |
| 6 (EN/SYNC) | Enable & External Clock Input | Digital enable (1.2V–1.6V threshold); accepts 200kHz–2MHz sync signal to align switching edges across multiple converters. |
| 7 (VCC) | Internal 5V LDO Output | Powers control circuitry; requires 0.1μF–0.22μF ceramic decoupling; not intended for external load sourcing. |
| 8 (FB) | Feedback Input | Senses output via resistor divider; internal 0.807V reference enables precise output setting; sensitive to noise - route away from SW/BST. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated 80mΩ HS / 30mΩ LS MOSFETs eliminate external diode losses, enabling >92% peak efficiency at 3A/3.3V output. |
| Internal Soft-Start | 1.2ms ramp time prevents output overshoot and inrush current during startup - no external components required. |
| Power-Save Mode | Automatically engages at light load to maintain regulation while reducing switching losses and improving standby efficiency. |
| Frequency Fold-Back | Reduces fSW to 25% of nominal when FB < 400mV - limits peak inductor current during short-circuit faults and prevents thermal runaway. |
| OCP + Hiccup Recovery | Cycle-by-cycle current limiting triggers automatic restart attempts every ~10ms after fault removal - protects MOSFETs and PCB traces under sustained overload. |
Applications
| Notebook I/O Power | Digital Set-Top Box Core Supply |
|---|---|
Use Scenario: Powers USB hub controllers, PCIe switch I/O, and display interface circuitry in ultrabooks and 2-in-1 laptops. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 3.3V/3A rail from 12V main battery or adapter input. Use Value: High efficiency (>90% at full load) extends battery runtime; TSOT-23-8 footprint saves board area versus larger SO-8 alternatives. | Use Scenario: Supplies 1.2V/3A core voltage to SoC processors and 3.3V/2A for HDMI PHY and tuner modules in cable/satellite receivers. IC Role / Device Role / Timing Role: Dual-rail generation using single IC with external feedback dividers - reduces BOM count and layout complexity. Use Value: Internal 500kHz switching enables small 4.7μH inductors; power-good signal synchronizes SoC reset sequencing. |
| Flat-Panel Monitor Logic Supply | Distributed Power System Module |
Use Scenario: Generates 2.5V/3A and 1.8V/3A rails for timing controllers (TCON), LVDS transmitters, and backlight LED drivers in LCD/LED monitors. IC Role / Device Role / Timing Role: Secondary DC/DC stage converting 12V panel supply into precision low-voltage logic rails with tight line/load regulation. Use Value: 0.807V reference and current-mode control ensure <±1% output accuracy across temperature and input variation. | Use Scenario: Embedded power module in industrial gateways and network appliances requiring isolated 5V/3A auxiliary supply from 12V or 24V backplane. IC Role / Device Role / Timing Role: Compact, self-contained buck stage within modular power architecture - avoids discrete FET+controller designs. Use Value: Integrated MOSFETs and internal compensation reduce component count by ≥6 vs. controller-only solutions; thermal shutdown ensures field reliability. |
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 successor with improved thermal performance (θJA = 85°C/W), lower quiescent current (0.4mA vs. 1mA), and extended UVLO hysteresis (750mV vs. 650mV). | Recommended for new designs requiring longer lifetime and higher ambient temperature tolerance (up to +125°C junction). | Select MP1475S when designing new products - it replaces MP1475DJ-LF-Z with no layout change but better thermal margin and efficiency. |
| RT7272BGJ8F | 4.5V–18V input, 3A output, 600kHz fixed frequency, 0.8V reference, but uses external MOSFETs and requires more external components (gate drivers, compensation). | Suitable where higher input voltage margin (18V) or programmable soft-start is needed, but increases BOM and layout effort. | Choose RT7272BGJ8F only if input exceeds 16V or if discrete MOSFET selection is required for specialized thermal or reliability requirements. |
Compared with MP1475DJ-LF-Z, MP1475S offers superior thermal resilience and lower no-load consumption for new designs, while RT7272BGJ8F trades integration for wider input range and external FET flexibility - making MP1475DJ-LF-Z optimal for cost-sensitive, space-constrained legacy upgrades where pin compatibility is critical.
Availability
MP1475DJ-LF-Z is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box core supply, and flat-panel monitor logic supply requiring stable component supply and long-term industrial availability.
Supply support for MP1475DJ-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP1475 belongs to MPS's high-efficiency synchronous buck converter product line, designed specifically for compact, high-current DC/DC conversion in consumer and computing systems where thermal density and board space are constrained.
FAQ
What is the maximum recommended output current for MP1475DJ-LF-Z in continuous operation?
The MP1475DJ-LF-Z delivers 3A continuous output current under standard conditions (TA = 25°C, 4-layer PCB, proper thermal layout). Derating is required above 85°C ambient; at 100°C ambient, maximum continuous current drops to approximately 2.1A due to thermal limits and θJA = 100°C/W.
Can MP1475DJ-LF-Z synchronize to an external clock, and what is the valid frequency range?
Yes - the EN/SYNC pin accepts an external clock signal from 200kHz to 2MHz. Synchronization occurs on the rising edge of the external clock, aligning the internal PWM cycle. The external clock must have pulse width <1.7μs and be applied ≥2ms after startup to avoid instability during soft-start.
Does MP1475DJ-LF-Z support adjustable output voltage, and what is the minimum achievable value?
Yes - output voltage is set via an external resistor divider on the FB pin, referenced to an internal 0.807V bandgap. Minimum output is 0.8V (limited by reference tolerance and divider resolution); common values include 1.0V, 1.2V, 1.8V, 2.5V, 3.3V, and 5.0V, all supported with appropriate R1/R2 selection per datasheet Table 1.
What protection features are built into MP1475DJ-LF-Z, and how do they behave during fault conditions?
MP1475DJ-LF-Z includes over-current protection (OCP) with hiccup mode, thermal shutdown (150°C trip, 130°C recovery), input UVLO (3.9V rising threshold), and power-good monitoring. During short-circuit, OCP triggers, then fold-back reduces frequency; if VFB drops below 400mV, hiccup mode initiates periodic restart attempts until fault clears.
Is an external bootstrap diode required for MP1475DJ-LF-Z, and when should it be used?
An external bootstrap diode (e.g., IN4148) from VCC to BST is optional but recommended when VOUT ≥3.3V and duty cycle >65% (i.e., VIN > 5V for 3.3V output). It improves high-duty-cycle efficiency by reducing BST capacitor discharge through the internal charge pump, especially in 12V-to-5V or 12V-to-3.3V applications.
How does the internal soft-start function, and can its duration be modified?
The MP1475DJ-LF-Z implements fixed 1.2ms internal soft-start: a controlled ramp on the internal reference voltage prevents output overshoot and limits inrush current. Duration is not user-adjustable - no external capacitor or resistor modifies this timing, ensuring consistent startup behavior across units and temperatures.
What is the purpose of the T-type feedback network shown in the datasheet, and when is it needed?
The T-type network (R1, R2, Rt, Cf) improves loop stability and transient response for low-output-voltage designs (<2.5V), where standard two-resistor dividers introduce excessive noise sensitivity and phase margin loss. It's recommended for 1.0V–1.8V outputs per Table 1, with specific Rt and Cf values provided for each target voltage.
MP1475DJ-LF-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:
- 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-Z FAQ
1.How can I place an order for MP1475DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1475DJ-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 MP1475DJ-LF-Z reliable?
The price and inventory of MP1475DJ-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 MP1475DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1475DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1475DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1475DJ-LF-Z?
MP1475DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1475DJ-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 MP1475DJ-LF-Z?
For technical support, including MP1475DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1475DJ-LF-Z requirements.
6.How does Aetrix verify that MP1475DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1475DJ-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 MP1475DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1475DJ-LF-Z?
All MP1475DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1475DJ-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 MP1475DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP1475DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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