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Monolithic Power Systems Inc. MP1497DJ-LF-P
- Part No.:
- MP1497DJ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1497DJ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,610
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Product details
Overview
MP1497DJ-LF-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 80mΩ high-side and 30mΩ low-side MOSFETs, delivering up to 3A continuous output current across a 4.5V–16V input range. It operates at a fixed 500kHz switching frequency (±12%), supports external clock synchronization (200kHz–2MHz), and features programmable soft-start, over-current hiccup protection, and thermal shutdown - deployed in notebook I/O power rails and flat-panel display supplies.
For engineers reviewing the MP1497DJ-LF-P datasheet, MP1497DJ-LF-P pinout, MP1497DJ-LF-P application, or MP1497DJ-LF-P equivalent, key selection criteria include its TSOT-23-8 package footprint, internal bootstrap driver architecture, 0.8V feedback reference accuracy (±2.5% over –40°C to +85°C), and cycle-by-cycle current limiting with 4.2A–5A trip threshold.
Technical Context
The MP1497DJ-LF-P uses peak-current-mode control with a fixed-frequency oscillator and internal error amplifier referenced to a trimmed 0.807V bandgap. Its proprietary switching-loss-reduction technique minimizes dead-time conduction loss while maintaining stable regulation under wide load transients.
It integrates a 5V internal bias regulator powered from VIN, a bootstrap circuit with 2.2V UVLO on BST, and EN/SYNC pin combining digital enable logic with external clock synchronization capability - enabling precise timing coordination in multi-rail systems without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports direct connection to 5V, 12V, and 15V system rails without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering core logic, DDR termination, or display interface ICs in portable electronics. |
| Switching Frequency | 500kHz (typical), ±12% tolerance - balances EMI performance and inductor size; synchronizable to 200kHz–2MHz external clock. |
| Feedback Reference | 0.807V ±2.5% (–40°C to +85°C) - enables accurate output voltage setting down to 0.8V with standard resistor dividers. |
| HS/LS RDS(on) | 80mΩ / 30mΩ - reduces conduction loss at full load, supporting >90% efficiency at 12VIN/3.3VOUT. |
| Soft-Start Control | Externally programmable via SS pin capacitor - prevents inrush current during power-up in battery-powered or hot-swap systems. |
| OCP Threshold | 4.2A–5A (guaranteed by design) - provides robust short-circuit protection with hiccup mode recovery to limit thermal stress. |
| Thermal Shutdown | 150°C junction temperature with 20°C hysteresis - ensures safe operation under sustained overload or poor PCB thermal design. |
Pinout & Package
MP1497DJ-LF-P is housed in an 8-pin TSOT-23 package (3.0mm × 3.0mm × 0.9mm height), optimized for high-density PCB layouts with exposed thermal pad (GND-connected) for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SS | Soft-Start Control | Connects to external capacitor to set ramp time for output voltage; internal 11μA current source charges it to 0.8V threshold. |
| 2 - IN | Power Input | Main supply rail (4.5V–16V); requires local 22μF ceramic decoupling; routed with wide trace to minimize impedance. |
| 3 - SW | Switch Node | Drives external inductor; carries high di/dt; must be kept short and away from analog traces like FB or SS. |
| 4 - GND | System Ground | Reference for all internal circuits and output voltage; connects directly to PCB ground plane with multiple vias. |
| 5 - BST | Bootstrap Supply | Forms floating gate drive for high-side MOSFET; requires 0.1μF capacitor between BST and SW pins. |
| 6 - EN/SYNC | Enable & Clock Sync | Digital enable (1.2V–1.6V rising threshold); accepts external clock signal (200kHz–2MHz) for synchronized switching. |
| 7 - VCC | Bias Regulator Output | Internal 5V supply for control circuitry; decoupled with 0.1μF–0.22μF ceramic cap placed adjacent to pin. |
| 8 - FB | Feedback Input | Monitors output voltage via resistor divider; comparator trips at <400mV to initiate foldback during short-circuit. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency by ~5% vs. asynchronous designs. |
| Proprietary switching-loss reduction | Optimizes gate drive timing and dead-time control to minimize shoot-through and body-diode conduction in HS/LS FETs. |
| External clock synchronization | Enables noise-sensitive applications (e.g., audio subsystems) to avoid beat frequencies by locking switching to system master clock. |
| Hiccup-mode over-current protection | Reduces average short-circuit current to <100mA during fault, preventing thermal runaway and enabling self-recovery without manual reset. |
| Integrated 5V bias regulator | Derives VCC from VIN across full input range, eliminating need for auxiliary supply and simplifying BOM in single-rail systems. |
Applications
| Portable Notebook I/O Power | Digital Set-Top Box Core Rail |
|---|---|
|
Use Scenario: Powering USB controller, PCIe switch, and SATA PHY circuitry in ultrabook platforms with tight thermal constraints. IC Role / Device Role / Timing Role: Primary 3.3V/3A buck regulator; delivers regulated output with <1% line/load regulation and fast transient response (<10μs). Use Value: Internal MOSFETs and 500kHz operation reduce solution size to <100mm², enabling placement near high-speed interfaces without EMI coupling. |
Use Scenario: Generating 1.2V core supply for ARM-based SoC in cable/satellite STB with variable load from 0.5A to 3A. IC Role / Device Role / Timing Role: Synchronous step-down converter with programmable soft-start; regulates output using FB pin and external resistor divider. Use Value: 0.807V reference tolerance and current-mode control ensure stable 1.2V output across temperature and input ripple, meeting SoC VDD spec. |
| Flat-Panel Display Logic Supply | Distributed Telecom Power |
|
Use Scenario: Providing 5V/2.5A for TCON (timing controller) and LVDS transmitter in 24" LCD monitor with 12V input bus. IC Role / Device Role / Timing Role: Fixed-frequency buck converter with EN/SYNC pin synchronized to panel refresh clock to suppress visible scan-line artifacts. Use Value: External clock sync eliminates beat interference between switching noise and pixel clock, preserving image integrity. |
Use Scenario: Local 3.3V conversion in remote radio unit (RRU) base station where space, efficiency, and thermal margin are critical. IC Role / Device Role / Timing Role: High-efficiency DC/DC stage converting 12V backplane to 3.3V FPGA I/O rail; operates continuously at 65°C ambient. Use Value: Thermal shutdown with 20°C hysteresis and 100°C/W θJA allow reliable operation without forced air cooling in sealed enclosures. |
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 |
|---|---|---|---|
| MP2333DJ-LF-Z | Successor device with improved efficiency (94% vs. 92%), lower quiescent current (25μA vs. 700μA), and extended input range (4.2V–18V). | Designed for new designs requiring higher light-load efficiency and longer battery life; pin-compatible but requires updated layout for BST capacitor placement. | Select MP2333DJ-LF-Z for new projects; MP1497DJ-LF-P remains viable for legacy repair or cost-sensitive volume production. |
| RT7295BGJ8F | Fixed 600kHz fSW, 4A current limit, 0.6V reference, no external sync capability; different pinout (EN on Pin 3, BST on Pin 6). | Used in industrial HMIs where higher current headroom and tighter reference tolerance are prioritized over sync flexibility. | Choose RT7295BGJ8F only when 0.6V reference or 4A OCP is required; not drop-in due to pin reassignment and missing sync function. |
Compared with MP2333DJ-LF-Z, MP1497DJ-LF-P offers proven reliability in mature designs but lacks light-load optimization; versus RT7295BGJ8F, it provides clock synchronization and a more flexible 0.807V reference at the cost of non-pin-compatibility and slightly lower max current rating.
Availability
MP1497DJ-LF-P is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box core rails, flat-panel display logic supplies, and distributed telecom power requiring stable component supply across long-lifecycle programs.
Supply support for MP1497DJ-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP1497 belongs to MPS's high-frequency synchronous buck converter product line, designed specifically for space-constrained consumer and computing applications demanding compact, efficient, and thermally robust DC/DC solutions.
FAQ
What is the maximum recommended input voltage for MP1497DJ-LF-P?
The absolute maximum input voltage is 17V, but the recommended operating range is 4.5V to 16V per datasheet specifications. Exceeding 16V risks violating the 17V absolute rating during transients and may trigger internal overvoltage protection or degrade long-term reliability.
Can MP1497DJ-LF-P operate without an external bootstrap capacitor?
No - the BST pin requires a 0.1μF ceramic capacitor connected between BST and SW to provide gate drive voltage for the high-side MOSFET. Omitting this capacitor prevents proper HS FET turn-on and causes immediate functional failure or erratic switching behavior.
How is output voltage adjusted on MP1497DJ-LF-P?
Output voltage is set using an external resistor divider from VOUT to GND, connected to the FB pin. With a 0.807V internal reference, VOUT = 0.807V × (1 + R1/R2); Table 1 in the datasheet provides validated resistor values for common outputs including 1.0V, 1.2V, 1.8V, 2.5V, 3.3V, and 5V.
Does MP1497DJ-LF-P support forced PWM mode?
No - the MP1497DJ-LF-P operates exclusively in peak-current-mode control with fixed-frequency operation and automatic pulse-skipping at light loads. It does not offer a dedicated pin or register to force continuous conduction mode (CCM) across all load conditions.
What is the purpose of the SS pin's internal 11μA current source?
The 11μA current source linearly charges the external SS capacitor to 0.8V, establishing a controlled voltage ramp that modulates the COMP voltage and limits inductor current slew rate during startup - preventing output overshoot and limiting input inrush current to safe levels.
Is MP1497DJ-LF-P RoHS compliant and lead-free?
Yes - the "-LF" suffix explicitly denotes lead-free and RoHS-compliant packaging. All MP1497DJ-LF-P units meet EU RoHS Directive 2011/65/EU requirements and are manufactured with matte tin plating on terminals.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
MPS has designated MP1497DJ-LF-P as legacy due to the introduction of the MP2333 - a pin-compatible successor with improved efficiency, lower IQ, wider input range, and enhanced thermal performance. New designs should use MP2333DJ-LF-Z unless backward compatibility or cost constraints mandate MP1497DJ-LF-P.
MP1497DJ-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:
- 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
MP1497DJ-LF-P FAQ
1.How can I place an order for MP1497DJ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1497DJ-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 MP1497DJ-LF-P reliable?
The price and inventory of MP1497DJ-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 MP1497DJ-LF-P is usually 5 days.
3.What payment methods are accepted for MP1497DJ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1497DJ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1497DJ-LF-P?
MP1497DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1497DJ-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 MP1497DJ-LF-P?
For technical support, including MP1497DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1497DJ-LF-P requirements.
6.How does Aetrix verify that MP1497DJ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1497DJ-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 MP1497DJ-LF-P meets industry standards.
7.What is the process for return or replacement of MP1497DJ-LF-P?
All MP1497DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1497DJ-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 MP1497DJ-LF-P part is unused and in its original packaging.
Return procedure for MP1497DJ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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