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Monolithic Power Systems Inc. MP2119DQ-LF-Z
- Part No.:
- MP2119DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2119DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,166
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Product details
Overview
MP2119DQ-LF-Z from Monolithic Power Systems is a 2A, 6V synchronous step-down switching regulator with fixed 1.5MHz PWM operation, 2.7V–6V input range, 0.8V adjustable output, integrated 100mΩ high- and low-side MOSFETs, and power-good (POK) monitoring - used in FPGA core supplies and point-of-load regulation for telecom equipment.
For engineers reviewing the MP2119DQ-LF-Z datasheet, MP2119DQ-LF-Z pinout, MP2119DQ-LF-Z application, or MP2119DQ-LF-Z equivalent, key selection criteria include thermal performance in QFN10 package, ±10% POK accuracy, internal soft-start timing (120µs), and EN/SYNC dual-function interface for synchronization or enable control.
Technical Context
The MP2119DQ-LF-Z implements peak current-mode control with internal Type II compensation, eliminating external compensation components while supporting loop bandwidth adjustment via FB resistor divider. Its 1.5MHz fixed-frequency oscillator enables compact filter design and reduces EMI filtering burden.
It integrates dual N-channel MOSFETs (100mΩ each), bootstrap gate drive (BS pin), hiccup-mode short-circuit protection, and cycle-by-cycle current limiting. The POK output provides open-drain status signaling with 30µs deglitching and ±10% output voltage window detection referenced to FB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports FPGA I/O rails and ASIC core supplies without external current boosting. |
| Input Voltage Range | 2.7V to 6V - compatible with single-cell Li-ion, USB-powered systems, and 3.3V/5V intermediate bus architectures. |
| Switching Frequency | 1.5MHz (±20%) - enables use of sub-1µH inductors and <100µF ceramic output capacitance for space-constrained designs. |
| Feedback Reference | 0.800V ±24mV - sets output voltage via external resistor divider; enables 0.8V–0.9×VIN adjustment with <1% regulation error over load/temperature. |
| Power Good Threshold | ±10% of nominal VOUT - ensures reliable system reset or sequencing control with 30µs glitch immunity on POK output. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-off behavior. |
| EN/SYNC Logic Thresholds | EN high ≥1.6V, EN low ≤0.4V - supports direct MCU GPIO control; SYNC accepts 1–2MHz external clock for EMI reduction. |
Pinout & Package
MP2119DQ-LF-Z is housed in a thermally enhanced 3mm × 3mm QFN-10 package with exposed pad (Pin 11) requiring solder connection to PCB ground plane for optimal thermal dissipation (θJA = 50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider midpoint; compares against internal 0.8V reference to regulate output voltage. |
| 2,9 GND | Ground Return | Dual ground pins reduce impedance path for input/output capacitor return currents and improve noise immunity. |
| 3,8 SW | Switch Node | Common node for internal high- and low-side MOSFETs; connects directly to inductor; requires minimal trace length. |
| 4,7 IN | Input Supply | Accepts 2.7–6V input; requires local 10–47µF ceramic decoupling per pin to suppress switching transients. |
| 5 BS | Bootstrap Supply | Connects via 0.1µF capacitor to SW; powers high-side gate driver; enables N-channel high-side switch operation. |
| 6 POK | Power Good Output | Open-drain output pulled low when VOUT deviates >±10%; requires external pull-up for logic-level interfacing. |
| 10 EN/SYNC | Enable & Sync Input | Dual-function pin: logic-level enable (0.4V/1.6V thresholds) or 1–2MHz external clock synchronization source. |
| 11 Exposed Pad | Thermal & Electrical Ground | Mandatory solder connection to PCB ground plane; accounts for >70% of total heat dissipation in QFN package. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor support | Enables full ceramic input/output filtering (X5R/X7R), eliminating electrolytic bulk capacitors and reducing board area by >30%. |
| Internal soft-start | Fixed 120µs ramp time prevents inrush current during startup; eliminates need for external soft-start circuitry or timing components. |
| Hiccup short-circuit protection | Shuts down and auto-restarts under sustained short; limits average power dissipation to safe levels without latching off. |
| Integrated 100mΩ MOSFETs | Eliminates external Schottky diode requirement in most applications; achieves >90% efficiency at 1.8V/2A with 5V input. |
| Frequency synchronization | Accepts 1–2MHz external clock on EN/SYNC pin to align switching edges across multiple regulators, reducing beat-frequency EMI. |
Applications
| FPGA Core Supply | ASIC I/O Rail |
|---|---|
|
Use Scenario: Providing stable 1.2V/1.5V core voltage to Xilinx Artix-7 or Intel Cyclone V FPGA under dynamic load steps up to 2A. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated core power with fast transient response and precise voltage tracking. Use Value: Internal compensation and 1.5MHz switching enable <100ns load-step response with <20mV undershoot using only 47µF ceramic output capacitance. |
Use Scenario: Generating 1.8V/2A I/O supply for high-speed SerDes interfaces in network switches with strict ripple requirements (<20mVpp). IC Role / Device Role / Timing Role: Point-of-load regulator placed adjacent to connector or PHY IC to minimize IR drop and noise coupling. Use Value: POK output enables real-time health monitoring of I/O rail integrity; ±10% window ensures compliance with JEDEC JESD8-12B specifications. |
| Printed Circuit Board Test Equipment | Industrial LCD Display Backlight Control |
|
Use Scenario: Powering programmable logic and ADC/DAC signal chains in automated test equipment requiring low-noise, stable 3.3V rails. IC Role / Device Role / Timing Role: Secondary regulator deriving clean 3.3V from 5V intermediate bus; synchronized to system clock to avoid interference with analog measurements. Use Value: EN/SYNC pin allows deterministic phase alignment with master clock, suppressing switching noise in sensitive analog acquisition paths. |
Use Scenario: Driving LED backlight strings in industrial HMIs where ambient temperature ranges from −40°C to +85°C. IC Role / Device Role / Timing Role: Constant-voltage source feeding LED driver IC; operates across full input range (2.7–6V) as battery voltage decays. Use Value: −40°C to +125°C junction rating and undervoltage lockout (2.59V) ensure reliable startup and operation during cold battery conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3A rated, 2.7–6V input, 1.2–1.8MHz adjustable frequency, no POK output, 0.6V reference. | Lacks power-good signaling; requires external monitoring circuit for system sequencing. | Select when higher current headroom is needed and POK is not required; footprint differs (QFN16 vs QFN10). |
| RT7290AGJ6F | 2A rated, 2.5–5.5V input, 1.5MHz fixed frequency, 0.6V reference, integrated POK, but no SYNC capability. | Missing frequency synchronization; unsuitable for multi-rail EMI-sensitive systems requiring phase alignment. | Choose when cost sensitivity outweighs EMI control needs; same QFN10 package but different pinout (no BS pin). |
Compared with TPS62130ARGTR and RT7290AGJ6F, MP2119DQ-LF-Z uniquely combines POK output, EN/SYNC dual functionality, and matched 100mΩ MOSFETs in a 3mm × 3mm QFN10 - making it optimal for space-constrained, sequenced, and EMI-controlled embedded power systems.
Availability
MP2119DQ-LF-Z is available at Aetrix Electronics and suitable for FPGA core supplies, telecom point-of-load regulation, and industrial display power management requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MP2119DQ-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2119 belongs to MPS's high-frequency synchronous buck regulator product line, engineered for compact, high-efficiency DC/DC conversion in portable, telecom, and industrial embedded systems where thermal density and layout simplicity are critical.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2119DQ-LF-Z requires ≥47µF ceramic output capacitance (X5R/X7R) for stable regulation and <20mVpp ripple at 2A load. Lower values may cause instability or excessive overshoot during load transients due to insufficient loop damping.
Can the MP2119DQ-LF-Z operate without an external bootstrap capacitor?
No - the BS pin requires a 0.1µF ceramic capacitor connected to the SW node to generate the floating gate drive voltage for the high-side MOSFET. Omitting this capacitor disables high-side switching and causes immediate failure or no output regulation.
Does the POK output indicate overvoltage or undervoltage conditions?
Yes - POK asserts LOW when output voltage falls outside the ±10% window around the nominal setpoint (e.g., 1.62V–1.98V for 1.8V output). It does not distinguish between overvoltage and undervoltage; both trigger the same fault signal.
What is the maximum duty cycle limitation and how does it affect minimum output voltage?
The MP2119DQ-LF-Z supports up to 90% duty cycle, enabling minimum output voltages down to 0.8V at VIN ≥ 0.889V. At VIN = 2.7V, the lowest achievable regulated output is 0.8V; below that, dropout occurs due to internal switch RDS(on) and timing constraints.
Is an external Schottky diode required for reliable operation?
An external Schottky diode is optional but recommended near the SW/GND nodes when operating continuously at ≥1.8A or under high-temperature conditions (>85°C ambient), as it reduces voltage spikes and improves efficiency by ~1–2% at full load.
How does the EN/SYNC pin behave during synchronization mode?
When a 1–2MHz clock is applied, the MP2119DQ-LF-Z locks its internal oscillator to the external signal within one cycle. If the clock pauses >4µs, the device interprets it as an enable command and shuts down - requiring re-synchronization upon clock resumption.
What is the thermal resistance of the QFN10 package with standard 4-layer PCB layout?
With JEDEC JESD51-7 4-layer PCB (2oz copper, 1-in² exposed pad), θJA is 50°C/W and θJC is 12°C/W. Full thermal performance requires soldering the exposed pad to a solid ground plane; omitting this increases junction temperature by >35°C at 2A load.
MP2119DQ-LF-Z 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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.4V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP2119DQ-LF-Z FAQ
1.How can I place an order for MP2119DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2119DQ-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 MP2119DQ-LF-Z reliable?
The price and inventory of MP2119DQ-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 MP2119DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2119DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2119DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2119DQ-LF-Z?
MP2119DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2119DQ-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 MP2119DQ-LF-Z?
For technical support, including MP2119DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2119DQ-LF-Z requirements.
6.How does Aetrix verify that MP2119DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2119DQ-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 MP2119DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2119DQ-LF-Z?
All MP2119DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2119DQ-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 MP2119DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP2119DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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