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Monolithic Power Systems Inc. MP1474DJ-LF-P
- Part No.:
- MP1474DJ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1474DJ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,367
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Product details
Overview
MP1474DJ-LF-P from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 100mΩ/40mΩ MOSFETs, fixed 500kHz switching frequency, 4.5–16V input range, and adjustable 0.8V output voltage. It delivers up to 2.5A peak output current with power-good indication, thermal shutdown, and hiccup-mode over-current protection-used in notebook I/O power rails and flat-panel display subsystems.
For engineers reviewing the MP1474DJ-LF-P datasheet, MP1474DJ-LF-P pinout, MP1474DJ-LF-P application, or MP1474DJ-LF-P equivalent, key selection criteria include its TSOT-23-8 package footprint, internal soft-start (1.2ms), feedback reference voltage (807mV), EN/SYNC dual-function pin, and bootstrap capacitor requirement for high-side gate drive.
Technical Context
The MP1474DJ-LF-P employs peak-current-mode control with a fixed 500kHz oscillator and supports external synchronization from 200kHz to 2MHz. Its internal 5V LDO powers control circuitry across the full input range, while the error amplifier compares FB voltage to an 807mV reference to generate COMP voltage for cycle-by-cycle current limiting.
It integrates high-side and low-side MOSFETs with RDS(ON) of 100mΩ and 40mΩ respectively, enabling synchronous rectification. The bootstrap circuit charges via SW–BST capacitor, and the PG pin provides open-drain power-good signaling with 0.4ms delay and 90%/85% VFB thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports wide industrial and computing supply rails including 5V, 12V, and 16V bus systems. |
| Switching Frequency | Fixed 500kHz (±14%) - enables compact magnetics design; synchronizable to 200kHz–2MHz external clock. |
| Output Voltage Range | Adjustable from 0.8V - set via external resistor divider; 807mV internal reference ensures ±1.5% accuracy at 25°C. |
| Peak Output Current | 2.5A - supports sustained 2A loads with margin for transient peaks in portable and display power applications. |
| Internal MOSFET RDS(ON) | 100mΩ (HS) / 40mΩ (LS) - reduces conduction loss and improves efficiency at medium load currents. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during overload or poor PCB thermal design; resumes operation at ~130°C. |
| Power-Good Delay | 0.4ms - provides stable output validation before system enable, preventing false startup in noise-sensitive environments. |
Pinout & Package
MP1474DJ-LF-P is housed in an 8-pin TSOT-23 package with exposed thermal pad (pin 4 GND). The package supports high-density PCB layouts and requires careful thermal via placement under the GND pad for reliable 2A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Power-Good Open-Drain Output | Signals valid regulation when FB ≥ 90% of reference; requires external pull-up; 0.4ms delay prevents chatter during soft-start. |
| 2 (IN) | Main Input Supply | Accepts 4.5–16V; powers internal LDO and MOSFETs; requires low-ESR ceramic decoupling placed adjacent to pin. |
| 3 (SW) | Switch Node | Connects to inductor and BST capacitor; swings from GND to VIN; demands short, wide traces to minimize EMI and ringing. |
| 4 (GND) | System Ground Reference | Primary return path for power and signal; must connect directly to large ground plane with multiple vias for thermal and noise control. |
| 5 (BST) | Bootstrap Capacitor Terminal | Forms floating supply for high-side driver; requires 0.1–1μF ceramic cap between BST and SW; 20Ω series resistor recommended. |
| 6 (EN/SYNC) | Enable & External Clock Input | Digital enable (1.2–1.6V threshold); also accepts 200kHz–2MHz sync signal; internal 1MΩ pull-down allows floating shutdown. |
| 7 (VCC) | Internal 5V LDO Output | Powers control logic; requires 0.1–0.22μF ceramic decoupling; not intended for external loading beyond internal circuits. |
| 8 (FB) | Feedback Input | Compares output voltage to 807mV reference; sensitive analog node-requires short trace, no vias, and proximity to resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Power-Save Mode at Light Load | Reduces quiescent current to 0.6mA typical, extending battery life in standby without compromising regulation accuracy. |
| Internal Soft-Start | 1.2ms ramp time prevents output overshoot and inrush current during startup-no external components required. |
| Synchronous Rectification | Eliminates external Schottky diode; achieves >90% efficiency at 1A–2A loads with 12V input and 3.3V output. |
| Hiccup-Mode Over-Current Protection | Enters periodic restart on output short; limits average fault current to <100mA, reducing thermal stress during sustained faults. |
| Under-Voltage Lockout (UVLO) | 3.9V rising threshold with 650mV hysteresis prevents erratic operation during brown-out conditions on input rail. |
Applications
| Notebook I/O Power Rail | Digital Set-Top Box Core Logic |
|---|---|
|
Use Scenario: Supplies 3.3V/2A to USB controller, PCIe switch, and audio codec in ultrabook motherboard. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated I/O voltage with fast transient response to burst data traffic. Use Value: Internal MOSFETs and 500kHz switching enable compact layout; PG signal coordinates system power sequencing with PCH. |
Use Scenario: Powers 2.5V/2A SoC core domain in cable/satellite STB with variable thermal envelope. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter responding to dynamic CPU load changes with minimal output ripple. Use Value: Hiccup-mode OCP prevents thermal runaway during firmware update failures; EN/SYNC allows coordinated power-down with HDMI hot-plug detection. |
| Flat-Panel Monitor T-Con Board | Distributed Telecom Power Module |
|
Use Scenario: Generates 1.8V/2A for timing controller ASIC driving LVDS interface in 24-inch LCD panel. IC Role / Device Role / Timing Role: Secondary buck stage stepping down 5V intermediate rail to precise logic voltage with tight tolerance. Use Value: 807mV FB reference and low RDS(ON) ensure ±1% output accuracy across temperature; small TSOT-23-8 saves space on narrow T-Con PCB. |
Use Scenario: Provides isolated 5V/2A auxiliary supply for FPGA configuration and management MCU in 48V telecom shelf. IC Role / Device Role / Timing Role: Non-isolated intermediate converter feeding downstream isolated DC-DC modules; operates from 12V intermediate bus. Use Value: Wide 4.5–16V input range accommodates 12V bus variations; thermal shutdown + hiccup mode ensures field reliability without manual reset. |
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, lower quiescent current (4μA shutdown), and extended lifetime support. | Same TSOT-23-8 footprint and feature set; replaces MP1474 in new designs per MPS notice. | Select MP1474S for new designs requiring long-term availability and enhanced light-load efficiency. |
| RT7272BGSP | 4.5–18V input, 500kHz fixed frequency, 2A rated, but uses external MOSFETs and lacks integrated BST driver. | Requires external high-side FET and bootstrap circuit; higher BOM count and layout complexity than MP1474DJ-LF-P. | Choose only if higher input voltage margin (>16V) or discrete FET selection flexibility is required. |
Compared with MP1474DJ-LF-P, MP1474S offers identical functionality with superior longevity and lower shutdown current, while RT7272BGSP trades integration for voltage headroom and FET customization-making MP1474DJ-LF-P optimal for space-constrained, cost-sensitive 12V-to-3.3V/2A applications where legacy compatibility is acceptable.
Availability
MP1474DJ-LF-P is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box core logic, and flat-panel monitor T-Con board designs requiring stable component supply and known thermal behavior in TSOT-23-8 format.
Supply support for MP1474DJ-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 design centers in the US, China, and Taiwan.
The MP1474 belongs to MPS's mainstream synchronous buck converter product line, engineered for compact, high-efficiency point-of-load regulation in consumer and computing applications where integration, thermal robustness, and ease of use are prioritized.
FAQ
What is the maximum recommended output current for continuous operation?
The MP1474DJ-LF-P supports up to 2A continuous output current under typical thermal conditions (TA = 25°C, 4-layer PCB with thermal vias). Peak current capability is 2.5A, but sustained 2A operation requires proper PCB copper area and airflow to maintain junction temperature below 125°C.
Can the MP1474DJ-LF-P be synchronized to an external clock?
Yes-pin 6 (EN/SYNC) accepts an external clock signal from 200kHz to 2MHz. Synchronization begins 2ms after output regulation is established. The external clock must have a pulse width under 1.7μs and rise/fall times compatible with CMOS logic levels.
Is an external bootstrap diode required?
No-external bootstrap diode is optional and only beneficial when VOUT ≥ 3.3V and duty cycle exceeds 65% (e.g., 12V→5V). For standard 12V→3.3V operation, the internal bootstrap circuit suffices; IN4148 is recommended if added.
What is the purpose of the T-type feedback network?
The T-type network (R1/R2/Rt/Cf) improves loop stability and reduces noise sensitivity when setting low output voltages (<1.8V). It compensates for parasitic capacitance at the FB pin and maintains phase margin without requiring complex external compensation.
How does the hiccup-mode over-current protection behave during a short circuit?
Upon short-circuit detection, the MP1474DJ-LF-P disables switching, waits ~30ms, then attempts restart. If the fault persists, it repeats this cycle-limiting average input current to ~100mA and preventing thermal damage to the IC or PCB traces.
What is the minimum recommended input capacitor value and type?
A 22μF X5R/X7R ceramic capacitor is recommended, placed within 2mm of the IN and GND pins. For 2A operation, the capacitor must handle ≥1A RMS ripple current; adding a 0.1μF ceramic in parallel improves high-frequency decoupling.
Does the MP1474DJ-LF-P support adjustable switching frequency?
No-the internal oscillator is fixed at 500kHz. However, the device fully supports external frequency synchronization from 200kHz to 2MHz via the EN/SYNC pin, enabling EMI reduction or timing alignment with other system clocks.
MP1474DJ-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):
- 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-P FAQ
1.How can I place an order for MP1474DJ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1474DJ-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 MP1474DJ-LF-P reliable?
The price and inventory of MP1474DJ-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 MP1474DJ-LF-P is usually 5 days.
3.What payment methods are accepted for MP1474DJ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1474DJ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1474DJ-LF-P?
MP1474DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1474DJ-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 MP1474DJ-LF-P?
For technical support, including MP1474DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1474DJ-LF-P requirements.
6.How does Aetrix verify that MP1474DJ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1474DJ-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 MP1474DJ-LF-P meets industry standards.
7.What is the process for return or replacement of MP1474DJ-LF-P?
All MP1474DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1474DJ-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 MP1474DJ-LF-P part is unused and in its original packaging.
Return procedure for MP1474DJ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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