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Monolithic Power Systems Inc. MP1474DJ-LF-Z
- Part No.:
- MP1474DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1474DJ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,675
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Product details
Overview
MP1474DJ-LF-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 100mΩ/40mΩ MOSFETs, delivering up to 2.5A peak output current across a 4.5V–16V input range, fixed 500kHz switching frequency, and adjustable 0.8V–(VIN−3V) output voltage - deployed in notebook I/O power and flat-panel display supplies.
For engineers reviewing the MP1474DJ-LF-Z datasheet, MP1474DJ-LF-Z pinout, MP1474DJ-LF-Z application, or MP1474DJ-LF-Z equivalent, key selection criteria include its TSOT-23-8 package thermal resistance (θJA = 100°C/W), power-good indicator timing (0.4ms delay), current-mode control loop stability, and hiccup-mode over-current protection behavior under short-circuit conditions.
Technical Context
The MP1474DJ-LF-Z implements peak-current-mode control with an internal 500kHz oscillator and supports external synchronization from 200kHz to 2MHz. Its error amplifier compares FB voltage against a 0.807V reference and drives a COMP node to regulate inductor current via cycle-by-cycle current limiting.
It integrates a 5V LDO (VCC) powered from VIN, bootstrap circuitry for high-side gate drive, and dual protection mechanisms: thermal shutdown at 150°C (20°C hysteresis) and hiccup-mode OCP triggered when FB falls below ~400mV during overload or short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports wide industrial and consumer supply rails including 5V, 12V, and 16V bus systems. |
| Output Voltage Range | 0.8V to (VIN − 3V) - enables generation of low-voltage rails (e.g., 1.0V, 1.2V, 1.8V, 3.3V) using external resistor divider on FB pin. |
| Switching Frequency | Fixed 500kHz (±14%) - balances efficiency, size, and EMI; synchronizable to 200kHz–2MHz external clock for noise management. |
| Peak Output Current | 2.5A - sufficient for powering core logic, DDR memory I/O, or display backlight drivers in compact systems. |
| Internal MOSFET RDS(on) | 100mΩ (HS) / 40mΩ (LS) - reduces conduction loss and improves full-load efficiency, especially at 3.3V/2A output. |
| Feedback Reference Voltage | 0.807V ±1.5% - sets output accuracy; used with external resistors to configure VOUT with <1% typical regulation error. |
| Power-Good Delay | 0.4ms - provides stable output monitoring before asserting PG high, preventing false system wake-up during startup transients. |
Pinout & Package
MP1474DJ-LF-Z is housed in an 8-pin TSOT-23 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density PCB layouts with exposed thermal pad (GND-connected) for enhanced thermal dissipation (θJA = 100°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Open-drain power-good indicator | Asserts high after 0.4ms when VFB ≥ 90% of reference; pulled low when VFB ≤ 85%; requires external 100kΩ pull-up to VCC. |
| 2 (IN) | Main input supply rail | Accepts 4.5V–16V; powers internal regulators and switches; requires low-ESR ceramic capacitor placed adjacent to pin. |
| 3 (SW) | Switch node | Connects to inductor and bootstrap capacitor; swings between ~0V and VIN; high di/dt node requiring short, wide traces and ground shielding. |
| 4 (GND) | System ground reference | Common return for output, feedback, and internal circuits; must connect to large copper pour with multiple vias for thermal and noise control. |
| 5 (BST) | Bootstrap supply for high-side driver | Requires 0.1μF–1μF capacitor between BST and SW; internal UVLO (2.2V) ensures reliable HS gate turn-on. |
| 6 (EN/SYNC) | Enable and external clock input | Logic-high (>1.25V) enables operation; floating or low disables; accepts 200kHz–2MHz sync signal with <1.7μs pulse width. |
| 7 (VCC) | Internal 5V LDO output | Powers control circuitry; decoupled with 0.1–0.22μF ceramic capacitor; not intended to drive external loads. |
| 8 (FB) | Feedback input | Compares output voltage (via resistor divider) to 0.807V reference; sensitive analog node requiring shortest possible trace and no vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous power stage | Eliminates need for external low-side diode, reducing BOM count and improving efficiency by >5% vs. asynchronous designs at 2A load. |
| Current-mode control architecture | Enables fast transient response (<10μs recovery from 1A→2A step) and simplifies compensation with single-pole dominant pole design. |
| Power-save mode at light load | Reduces quiescent current to 0.6mA typical, extending battery life in portable applications without compromising regulation accuracy. |
| Hiccup-mode over-current protection | Limits average short-circuit current to <100mA during fault, preventing thermal runaway and enabling safe auto-recovery after fault removal. |
| Internal soft-start | 1.2ms ramp time prevents output overshoot and inrush current spikes during startup, eliminating need for external soft-start circuitry. |
Applications
| Notebook I/O Power | Digital Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Providing regulated 3.3V/2A power to USB controllers, PCIe bridges, and SATA PHYs in ultrabook platforms. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load steps up to 2A with <50mV output deviation. Use Value: Achieves >92% efficiency at 12V input/3.3V@2A, minimizing thermal impact in thermally constrained chassis. |
Use Scenario: Generating 1.2V/2A core voltage for MPEG decoder SoCs in cable/satellite STBs operating from 12V wall adapter. IC Role / Device Role / Timing Role: Main SoC core supply with precise 0.807V reference and hiccup-mode protection against brown-out-induced latch-up. Use Value: Delivers tight line/load regulation (<±1.5%) across 4.5–16V input variation, ensuring stable SoC operation during AC line sags. |
| Flat-Panel Monitor Logic Rail | Distributed Power System Intermediate Bus |
|
Use Scenario: Converting 12V intermediate bus to 5V/2A for timing controller (TCON) and interface ICs in 24-inch LCD monitors. IC Role / Device Role / Timing Role: Secondary buck converter with EN/SYNC pin synchronized to system clock to suppress switching noise in video signal path. Use Value: Enables 500kHz fixed-frequency operation aligned to system timing, reducing beat frequencies that cause visible screen artifacts. |
Use Scenario: Stepping down 12V intermediate bus to 2.5V/2A for FPGA I/O banks and ADC reference supplies in industrial PLC modules. IC Role / Device Role / Timing Role: Point-of-load regulator with PG output tied to FPGA configuration logic to prevent boot until stable 2.5V is confirmed. Use Value: PG assertion delay (0.4ms) matches FPGA power-on reset timing requirements, eliminating need for external supervisor IC. |
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 |
|---|---|---|---|
| MP1474S | Pin-compatible successor with improved thermal performance (θJA = 85°C/W), lower quiescent current (0.45mA), and extended lifetime support. | Recommended for new designs requiring long-term availability and higher reliability in continuous 2A operation. | Select MP1474S where lifecycle continuity, reduced thermal rise, or RoHS-6 compliance beyond 2024 is required. |
| RT7297B | 4.5V–18V input, 2A rated, 600kHz fixed frequency, but lacks PG output and external sync capability. | Suitable for cost-sensitive, non-safety-critical applications where power-good signaling and EMI control are not mandatory. | Choose RT7297B only if PG functionality and clock synchronization are unnecessary and board space allows larger SO-8 package. |
Compared with MP1474DJ-LF-Z, MP1474S offers better thermal margin and longer product lifecycle, while RT7297B trades away PG and sync features for lower unit cost - making MP1474DJ-LF-Z optimal for legacy designs needing exact form-fit-function replacement with known qualification history.
Availability
MP1474DJ-LF-Z is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box core supplies, and flat-panel monitor logic rails requiring stable component supply and documented thermal derating curves.
Supply support for MP1474DJ-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 power ICs, with over two decades of expertise in DC-DC conversion, motor drivers, and LED lighting controllers.
The MP1474 belongs to MPS's mainstream synchronous buck converter product line, designed specifically for space-constrained, medium-power applications demanding high efficiency, minimal external components, and robust protection in consumer and computing systems.
FAQ
What is the maximum recommended output current for continuous operation?
The MP1474DJ-LF-Z supports up to 2.5A peak output current, but continuous operation at 2A requires proper PCB thermal design: 2oz copper, 4+ thermal vias under GND pad, and ambient temperature ≤60°C. Derate linearly to 1.5A at 85°C ambient per θJA = 100°C/W.
Can the MP1474DJ-LF-Z be synchronized to an external clock?
Yes - the EN/SYNC pin accepts a 200kHz–2MHz square-wave clock with <1.7μs pulse width. Synchronization occurs on the rising edge of the external clock, aligning the internal oscillator phase to reduce conducted EMI in multi-rail systems.
Is an external bootstrap diode required?
An external bootstrap diode (e.g., IN4148) is optional and beneficial only when VOUT ≥ 3.3V and duty cycle >65% (i.e., VIN > 5V for 3.3V output). It improves high-side gate drive efficiency by bypassing the internal bootstrap path during high-duty cycles.
How does the hiccup-mode over-current protection behave during a short circuit?
When output is shorted, inductor current peaks exceed 3A threshold, causing FB to drop below 400mV. This triggers frequency fold-back and eventually hiccup mode: the IC shuts down for ~10ms, then attempts restart. Average short-circuit current remains <100mA, limiting junction temperature rise.
What is the minimum output voltage achievable with the FB pin?
The FB pin references an internal 0.807V bandgap, so the theoretical minimum output is 0.807V. In practice, stable regulation down to 0.8V is achievable using precision resistors (e.g., 1% tolerance) and careful layout to minimize FB trace parasitics.
Does the MP1474DJ-LF-Z support power-save mode at light load?
Yes - it automatically enters power-save mode when load drops below ~200mA, reducing switching frequency and quiescent current to 0.6mA typical. This maintains >85% efficiency at 10mA load, critical for standby power compliance in ENERGY STAR devices.
What is the purpose of the T-type feedback network shown in the datasheet?
The T-type network (R1/R2/Rt/Cf) compensates for FB pin input capacitance and improves phase margin when regulating very low output voltages (e.g., 1.0V or 1.2V), where standard resistor dividers introduce instability due to parasitic capacitance at the FB node.
MP1474DJ-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):
- 13V
- Current - Output:
- 2A
- 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
MP1474DJ-LF-Z FAQ
1.How can I place an order for MP1474DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1474DJ-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 MP1474DJ-LF-Z reliable?
The price and inventory of MP1474DJ-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 MP1474DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1474DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1474DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1474DJ-LF-Z?
MP1474DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1474DJ-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 MP1474DJ-LF-Z?
For technical support, including MP1474DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1474DJ-LF-Z requirements.
6.How does Aetrix verify that MP1474DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1474DJ-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 MP1474DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1474DJ-LF-Z?
All MP1474DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1474DJ-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 MP1474DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP1474DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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