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Monolithic Power Systems Inc. MP1497SGJ-Z
- Part No.:
- MP1497SGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP1497SGJ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:980
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Product details
Overview
MP1497SGJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 120mΩ high-side and 50mΩ low-side MOSFETs, delivering up to 3A continuous output current across a 4.5V–16V input range, fixed 500kHz switching frequency, and adjustable 0.8V–VIN×0.95 output voltage - deployed in notebook I/O power, flat-panel TV supplies, and distributed power rails.
For engineers reviewing the MP1497SGJ-Z datasheet, MP1497SGJ-Z pinout, MP1497SGJ-Z application, or MP1497SGJ-Z equivalent, key selection criteria include internal MOSFET RDS(on), external clock synchronization capability (300kHz–2MHz), programmable soft-start via SS pin, hiccup-mode over-current protection, and thermal shutdown at 150°C.
Technical Context
The MP1497SGJ-Z employs peak-current-mode control with a fixed 500kHz oscillator and supports external clock synchronization for EMI reduction. Its proprietary switching-loss-reduction technique improves efficiency across light-to-heavy loads by optimizing gate drive timing and minimizing dead-time losses.
It integrates a 5V internal VCC regulator powered from VIN, a precision 0.807V feedback reference (±2.5% over –40°C to +85°C), and a bootstrap circuit with 2.2V UVLO for the high-side driver. The EN/SYNC pin combines digital enable logic with 300kHz–2MHz sync input tolerance and internal 6.5V Zener clamping.
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 systems without pre-regulation. |
| Output Current | 3A continuous - sustained under full load with proper PCB thermal design and 1.25W max power dissipation at 25°C ambient. |
| Switching Frequency | Fixed 500kHz (±18%) - enables compact magnetics; externally synchronizable from 300kHz to 2MHz for noise-sensitive applications. |
| Feedback Reference | 0.807V ±2.5% - sets output accuracy; allows precise 1.0V–5.0V outputs using standard resistor dividers per Table 1. |
| HS/LS RDS(on) | 120mΩ / 50mΩ - reduces conduction loss and improves full-load efficiency (>92% typical at 12VIN/3.3VOUT). |
| Soft-Start Control | Externally programmable via SS pin - 11µA current source charges external capacitor; enables controlled inrush limiting during power-up. |
| OCP & Protection | Cycle-by-cycle current limit (4.2–5A), hiccup-mode short-circuit recovery, thermal shutdown (150°C), and UVLO (3.9V rising threshold). |
Pinout & Package
MP1497SGJ-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 tight pitch (0.65mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS | Soft-Start Input | Connects to external capacitor to set ramp time; internal 11µA current source charges it to 0.8V to initiate regulation. |
| 2 IN | Main Input Supply | Accepts 4.5V–16V; requires local 22µF ceramic decoupling; routed with wide trace to minimize impedance and ripple. |
| 3 SW | Switch Node Output | Drives external inductor; high dv/dt node - must be kept short and away from analog traces (FB, SS) to avoid coupling. |
| 4 GND | Power & Signal Ground | System reference for FB, SS, EN; connects directly to thermal pad and large ground plane for thermal and noise performance. |
| 5 BST | Bootstrap Supply | Forms floating gate drive for HS MOSFET via external capacitor between BST and SW; 10Ω series resistor recommended. |
| 6 EN/SYNC | Enable & Clock Input | Digital enable (1.1–1.75V threshold); accepts external 300kHz–2MHz sync signal; includes 6.5V Zener clamp. |
| 7 VCC | Bias Regulator Output | Internal 5V supply; requires 0.1–0.22µF ceramic capacitor placed adjacent to pin and GND for stability. |
| 8 FB | Feedback Input | Senses output voltage via resistor divider; comparator compares to 0.807V reference; enters foldback mode if <400mV. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency by ~5–8% vs. asynchronous designs. |
| Proprietary switching-loss reduction | Optimizes gate drive timing and minimizes dead-time overlap, lowering switching loss especially at high duty cycles (>65%). |
| External clock synchronization | Enables EMI compliance in noise-sensitive systems (e.g., audio/video subsystems) by aligning switching edges to system clock. |
| Hiccup-mode over-current protection | Prevents thermal runaway during output short: limits average fault current and auto-restarts after cooling. |
| Integrated 5V VCC regulator | Derives bias supply directly from VIN across full input range - eliminates need for external LDO or charge pump. |
Applications
| Notebook Systems and I/O Power | Digital Set-Top Boxes |
|---|---|
|
Use Scenario: Powering USB-C PD port controllers, PCIe switch I/O rails, and embedded controller (EC) peripherals in ultrabooks. IC Role / Device Role / Timing Role: Primary buck regulator converting 12V or 15V main rail to 3.3V/1.8V/1.05V system I/O voltages with fast transient response. Use Value: Internal MOSFETs and 500kHz operation enable compact layout; hiccup OCP ensures safe operation during hot-plug events. |
Use Scenario: Generating 3.3V and 1.2V supplies for SoC, DDR memory, and HDMI PHY in cable/satellite STBs. IC Role / Device Role / Timing Role: Secondary buck stage downstream of front-end AC/DC or PoE converter; synchronized to system clock to suppress beat frequencies. Use Value: External sync capability (300kHz–2MHz) avoids audible noise in audio DAC sections; 0.807V reference enables tight output tolerance. |
| Flat-Panel Televisions and Monitors | Distributed Power Systems |
|
Use Scenario: Providing 5V and 3.3V logic rails for TCON (timing controller), backlight drivers, and microcontrollers in LCD/LED panels. IC Role / Device Role / Timing Role: Local point-of-load regulator on display module PCB; operates from 12V intermediate bus with minimal external components. Use Value: TSOT23-8 footprint saves space on constrained panel boards; thermal shutdown protects against ambient heat buildup near backlight LEDs. |
Use Scenario: Powering FPGA I/O banks, ADC/DAC reference supplies, and sensor interface rails in modular industrial controllers. IC Role / Device Role / Timing Role: Isolated secondary-side buck converter in multi-rail power architecture; configured for 0.8V–3.3V outputs via resistor feedback. Use Value: Adjustable soft-start prevents inrush-induced brownouts across shared 12V bus; current-mode control ensures stable regulation under dynamic load steps. |
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 | Lower 2A output current; 2MHz fixed frequency; no external sync; 3.3V–36V input range. | Better suited for higher-input, lower-current applications (e.g., automotive body electronics), but lacks hiccup OCP and programmable soft-start. | Select when input exceeds 16V or board space favors smaller 6-pin SOT563, but verify thermal margin at 3A. |
| TPS54302DDCR | 3A output; 4.5V–28V input; 500kHz fixed freq; integrated 110mΩ/70mΩ MOSFETs; no external sync. | Higher input voltage tolerance and tighter VFB accuracy (0.8V ±1%), but larger 6-pin SOT23 package and no hiccup-mode recovery. | Prefer for designs requiring >16V input or tighter output accuracy, but confirm EMI requirements allow unsynchronized operation. |
Compared with MP1497SGJ-Z, MP2451DT-LF-Z trades sync capability and hiccup protection for wider input range and smaller footprint, while TPS54302DDCR offers higher VIN tolerance and better VFB accuracy but sacrifices fault-recovery robustness and layout flexibility.
Availability
MP1497SGJ-Z is available at Aetrix Electronics and suitable for notebook I/O power, flat-panel TV logic rails, and distributed industrial power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP1497SGJ-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 MP1497S belongs to MPS's high-efficiency synchronous buck converter product line, engineered for space-constrained consumer and industrial applications demanding low quiescent current, fast transient response, and robust fault protection.
FAQ
What is the minimum recommended input capacitance for MP1497SGJ-Z?
The datasheet specifies a 22µF ceramic input capacitor (X5R/X7R) as standard for most applications. It must handle RMS current ≥1.5A (half of 3A max load) and be placed adjacent to IN and GND pins with short, wide traces to suppress high-frequency switching noise and prevent VIN droop during load transients.
Can MP1497SGJ-Z operate with an input voltage below 4.5V?
No - the absolute minimum operating input is 4.5V per Recommended Operating Conditions. Below this, the internal VCC regulator cannot sustain 5V bias, and UVLO (rising threshold 3.9V) forces shutdown. Operation at 4.2V or lower is not guaranteed and may result in erratic regulation or failure to start.
How does the hiccup-mode over-current protection work?
When cycle-by-cycle current limit triggers repeatedly (e.g., output short), MP1497SGJ-Z disables switching, waits ~10ms, then attempts restart. If fault persists, it repeats the cycle - limiting average power dissipation and die temperature. Recovery occurs automatically once short is removed and FB voltage rises above 400mV.
Is an external bootstrap diode required for reliable operation?
No - the internal bootstrap circuit functions reliably across all duty cycles. An external diode (e.g., IN4148) is optional and only beneficial when VOUT ≥3.3V and duty cycle >65% (e.g., 12V→5V), where it improves high-side gate drive strength and efficiency by ~1–2%.
What is the thermal resistance (θJA) of the TSOT23-8 package under standard conditions?
The datasheet specifies θJA = 100°C/W for the TSOT23-8 package on a 4-layer JEDEC-standard PCB (JESD51-7). Actual thermal performance depends on copper area, vias to internal ground planes, and airflow; adding a thermal pad connected to GND reduces θJA by ~25–35°C/W in optimized layouts.
Does MP1497SGJ-Z support forced PWM or power-save mode?
No - it operates exclusively in peak-current-mode PWM with fixed frequency. There is no pulse-skipping or discontinuous conduction mode (DCM) entry; light-load efficiency is maintained via low quiescent current (1mA typ) and optimized gate drive, not mode switching.
What is the maximum allowable BST capacitor value?
The datasheet recommends 0.1µF to 1µF ceramic for the BST capacitor. Values >1µF increase turn-on delay and risk overstressing the bootstrap diode during startup; values <0.1µF may cause insufficient gate drive voltage under high-duty-cycle conditions, leading to increased HS RDS(on) and thermal stress.
MP1497SGJ-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):
- 14.4V
- 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
MP1497SGJ-Z FAQ
1.How can I place an order for MP1497SGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1497SGJ-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 MP1497SGJ-Z reliable?
The price and inventory of MP1497SGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1497SGJ-Z is usually 5 days.
3.What payment methods are accepted for MP1497SGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1497SGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1497SGJ-Z?
MP1497SGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1497SGJ-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 MP1497SGJ-Z?
For technical support, including MP1497SGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1497SGJ-Z requirements.
6.How does Aetrix verify that MP1497SGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP1497SGJ-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 MP1497SGJ-Z meets industry standards.
7.What is the process for return or replacement of MP1497SGJ-Z?
All MP1497SGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1497SGJ-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 MP1497SGJ-Z part is unused and in its original packaging.
Return procedure for MP1497SGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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