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Monolithic Power Systems Inc. MP4350DQ-LF-P
- Part No.:
- MP4350DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP4350DQ-LF-P.pdf
- Description:
- IC LED DRIVER OFFL 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,091
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Product details
Overview
MP4350DQ-LF-P from Monolithic Power Systems is a 2.5A, 4MHz synchronous step-down DC/DC converter with integrated 150mΩ high-side MOSFET, 4.5V–20V input range, 0.8V–16V adjustable output, and 100µA quiescent current-designed for compact, high-efficiency power conversion in space-constrained battery-powered and automotive-grade systems.
For engineers reviewing the MP4350DQ-LF-P datasheet, MP4350DQ-LF-P pinout, MP4350DQ-LF-P application, or MP4350DQ-LF-P equivalent, key selection criteria include programmable 4MHz switching frequency, internal soft-start, frequency foldback at light load, thermal shutdown, and QFN10 (3mm × 3mm) package compatibility with ceramic capacitor stability.
Technical Context
The MP4350DQ-LF-P employs current-mode control with an internal error amplifier (200 V/V gain, 60 µA/V transconductance), precision 0.8V feedback reference, and cycle-by-cycle peak current limiting without external sense resistors. Its programmable oscillator uses an external resistor on the FREQ pin to set switching frequency from 1.6MHz to 4.8MHz.
It integrates a bootstrap-regulated floating gate driver for the high-side MOSFET, with BST-to-SW UVLO (2.2V rising threshold), and supports non-synchronous operation using an external Schottky diode. Startup includes 1.5ms internal soft-start and 50µs glitch blanking; shutdown occurs at EN < 1.2V, VIN < 2.6V, or junction temperature > 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.5A continuous-supports full-load operation up to 16V output with thermal derating per θJA = 50°C/W. |
| Input Voltage Range | 4.5V to 20V-enables direct use in 12V automotive and industrial rails, with UVLO thresholds at 3.0V (rising) and 2.6V (falling). |
| Switching Frequency | Programmable 1.6–4.8MHz via external resistor-4MHz operation enables ultra-small magnetics and avoids AM/ADSL EMI bands. |
| Quiescent Current | 100µA-enables >1-year standby in coin-cell–powered IoT sensors and portable devices. |
| Feedback Reference | 0.8V ±2.4%-allows precise output regulation from 0.8V to 16V using standard resistor dividers (e.g., 40.2kΩ/127kΩ for 3.3V). |
| Internal MOSFET RDS(ON) | 150mΩ-reduces conduction loss at 2.5A, enabling >95% peak efficiency at 12VIN/3.3VOUT. |
| Thermal Shutdown | 150°C with 15°C hysteresis-prevents latch-up during overload or poor PCB heatsinking; resumes operation below 135°C. |
Pinout & Package
MP4350DQ-LF-P is housed in a thermally enhanced 3mm × 3mm, 10-pin QFN package with exposed thermal pad on underside for PCB-level heat dissipation (θJC = 12°C/W). Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch Node | High-current output of internal MOSFET; connects directly to inductor and Schottky diode cathode-requires low-inductance layout to minimize voltage spikes. |
| 3 EN | Enable Input | Positive-logic enable with 1.5V rising / 1.2V falling thresholds; internal 1µA pull-up allows floating-enable operation. |
| 4 COMP | Compensation Node | Error amplifier output; connects to RC network for loop stability-clamped between 0.9V and 2.0V during operation. |
| 5 FB | Feedback Input | Senses scaled output voltage via resistive divider; compares to 0.8V internal reference to regulate output. |
| 6 GND | Power Ground | Main return path for high-switching-current loops; must be connected near output capacitor to minimize noise coupling. |
| 7 FREQ | Frequency Programming | Connects external resistor to GND to set oscillator frequency (e.g., 18kΩ → 4MHz); open-circuit defaults to ~2MHz. |
| 8, 9 VIN | Input Supply | Primary power input for control circuitry and bootstrap regulator; requires local 10µF ceramic decoupling close to pins. |
| 10 BST | Bootstrap Supply | Charges internal high-side driver via external capacitor to SW; must maintain ≥2.2V above SW to sustain gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Soft-Start | 1.5ms ramp time prevents output overshoot during power-up; eliminates need for external timing components. |
| Ceramic Capacitor Stability | Stable with low-ESR ceramic output caps (e.g., 22µF X5R) across full load range-no tantalum or electrolytic required. |
| Light-Load Frequency Foldback | Reduces switching frequency under light loads to maintain >85% efficiency at 10mA, minimizing gate and switching losses. |
| Integrated Current Limit | Fixed 2.9–3.5A cycle-by-cycle limit-eliminates external current-sense resistor and associated board area and power loss. |
| High-Frequency EMI Mitigation | 4MHz operation shifts switching noise beyond sensitive AM radio (530–1710kHz) and ADSL bands, easing compliance testing. |
Applications
| DSL Power Supply | Set-Top Box Core Rail |
|---|---|
|
Use Scenario: Provides regulated 3.3V/2.5A rail for DSL line card PHY and microcontroller in broadband access equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering stable core voltage with fast transient response to burst data traffic. Use Value: 4MHz switching enables <10µH inductors and compact 0805/1206 ceramics-reducing board area by 40% vs. 500kHz solutions. |
Use Scenario: Generates 1.8V/2A processor core supply in cable/satellite STBs operating from 12V front-end rail. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with programmable frequency to avoid interference with video/audio clock domains. Use Value: 100µA quiescent current extends standby runtime; internal soft-start prevents HDMI hot-plug reset glitches. |
| Battery-Powered Surveillance Camera | Automotive Infotainment Display |
|
Use Scenario: Powers image sensor and ISP in solar-charged outdoor security cameras with 3.7V Li-ion input. IC Role / Device Role / Timing Role: Wide-input buck converter maintaining 1.2V/2A output across 3.0V–4.2V battery discharge curve. Use Value: 4.5V–20V input range accommodates battery + boost stage; frequency foldback extends battery life by 3.2x at 50mA load. |
Use Scenario: Supplies 5V/2A backlight and interface logic in 12V automotive display modules with cold-crank tolerance. IC Role / Device Role / Timing Role: Automotive-grade buck regulator surviving 22V load-dump transients and -40°C to +85°C ambient. Use Value: 20V absolute max input rating and thermal shutdown ensure robustness during alternator surges and prolonged sun exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 2A output, fixed 2MHz frequency, no FREQ pin; 120mΩ RDS(ON); 120µA IQ | Limited to fixed-frequency designs; lacks programmability and light-load foldback. | Select when cost-sensitive, lower-current (≤2A), and fixed 2MHz operation suffices-no resistor programming needed. |
| TPS54202DRCT | 2A, 4.5–17V input, 500kHz–1.7MHz adjustable freq, 45µA IQ, integrated boot diode | Lower IQ but narrower input range; no 20V rating; requires external bootstrap diode in some layouts. | Prefer for ultra-low-power battery apps needing <50µA IQ, but verify 17V max input margin in 24V systems. |
Compared with MP4350DQ-LF-P, MP2451DT-LF-Z trades frequency flexibility and light-load efficiency for lower BOM count, while TPS54202DRCT offers superior quiescent current but sacrifices automotive-grade input voltage headroom and thermal robustness.
Availability
MP4350DQ-LF-P is available at Aetrix Electronics and suitable for DSL power supplies, set-top box core rails, battery-powered surveillance cameras, and automotive infotainment displays requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP4350DQ-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, and global distribution since 1997.
The MP4350 belongs to MPS's high-frequency buck converter product line, engineered specifically for space-constrained, high-efficiency DC/DC conversion in consumer, industrial, and automotive applications where EMI reduction and thermal reliability are critical.
FAQ
What is the minimum recommended output capacitor for stable operation at 4MHz?
A minimum 22µF X5R/X7R ceramic capacitor is required for stable 4MHz operation, placed within 3mm of the FB and GND pins. Lower values risk instability due to insufficient phase margin; use parallel 10µF + 2.2µF if ESL minimization is critical.
Can MP4350DQ-LF-P operate without an external Schottky diode?
No-it is a non-synchronous buck controller and requires an external Schottky diode (e.g., B320A-13-F) connected from SW to GND. Omitting it causes catastrophic failure due to lack of freewheeling path during high-side switch off-time.
How does the FREQ pin resistor value affect startup behavior?
A resistor <10kΩ on FREQ forces startup into pulse-skipping mode with reduced effective frequency, increasing output ripple. For reliable 4MHz startup, use 18kΩ (±1%)-verified to achieve full 4MHz lock within 200µs of EN assertion.
Is the exposed thermal pad electrically connected to GND?
Yes-the exposed pad is internally tied to GND and must be soldered to a dedicated thermal land connected to ≥4 internal GND planes. Leaving it unconnected degrades θJA by 22°C/W and risks thermal shutdown under 2A load.
What happens if BST voltage drops below 2.2V during operation?
The internal high-side driver UVLO triggers, disabling the MOSFET and forcing discontinuous conduction mode. This causes output voltage sag and increased ripple; remedy by reducing BST capacitor ESR or adding external bootstrap diode for >2MHz operation.
Does MP4350DQ-LF-P support forced PWM mode?
No-it operates exclusively in current-mode control with automatic frequency foldback at light loads. Forced PWM is not supported; for constant-frequency operation across all loads, consider MPQ4470-AEC1 (automotive-grade alternative).
How is the current limit threshold affected by temperature?
The 2.9–3.5A current limit has ±15% variation over –40°C to +85°C ambient, with typical drift of +0.05%/°C. At 85°C junction, limit reduces to ~2.75A-designers must verify worst-case inductor saturation margin at elevated temperature.
MP4350DQ-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 85VAC
- Voltage - Supply (Max):
- 265VAC
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP4350DQ-LF-P FAQ
1.How can I place an order for MP4350DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4350DQ-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 MP4350DQ-LF-P reliable?
The price and inventory of MP4350DQ-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 MP4350DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP4350DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4350DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4350DQ-LF-P?
MP4350DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4350DQ-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 MP4350DQ-LF-P?
For technical support, including MP4350DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4350DQ-LF-P requirements.
6.How does Aetrix verify that MP4350DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP4350DQ-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 MP4350DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP4350DQ-LF-P?
All MP4350DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4350DQ-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 MP4350DQ-LF-P part is unused and in its original packaging.
Return procedure for MP4350DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP4350DQ-LF-P Tags
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