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Monolithic Power Systems Inc. MP2119DQ-LF-P
- Part No.:
- MP2119DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2119DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 2A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,002
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Product details
Overview
MP2119DQ-LF-P from Monolithic Power Systems is a 2A, 6V synchronous step-down switching regulator with fixed 1.5MHz PWM operation, 0.8V to 0.9×VIN adjustable output, integrated 100mΩ high- and low-side MOSFETs, and power-good (POK) monitoring - deployed in µP core supplies and point-of-load regulation for FPGA I/O rails.
For engineers reviewing the MP2119DQ-LF-P datasheet, MP2119DQ-LF-P pinout, MP2119DQ-LF-P application, or MP2119DQ-LF-P equivalent, key selection considerations include its internal soft-start (120µs), frequency synchronization input (1–2MHz), ±10% POK window, thermal shutdown (150°C), and QFN10 (3mm × 3mm) package with exposed thermal pad.
Technical Context
The MP2119DQ-LF-P implements peak current-mode control with internal Type II compensation, eliminating external compensation components while supporting loop bandwidth tuning via FB resistor selection (e.g., 400kΩ for 70kHz with 47µF ceramic output cap). Its transconductance gain of 11.25A/V links COMP voltage directly to output current capability.
It integrates dual-function EN/SYNC pin enabling both enable/disable control (1.6V/0.4V thresholds) and external clock synchronization (1–2MHz), with hiccup-mode short-circuit protection triggered when VOUT drops below 50% nominal and automatic restart after soft-start capacitor discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports FPGA core/I/O rails without external current boosting. |
| Input Voltage Range | 2.7V to 6V - compatible with single-cell Li-ion, USB-powered, and 3.3V/5V intermediate bus systems. |
| Switching Frequency | 1.5MHz (±20%) - enables compact 0.47–1µH inductors and reduces EMI filter size. |
| Feedback Reference | 0.800V ±24mV - sets output accuracy; used with external resistor divider for precise VOUT adjustment. |
| Power Good Threshold | ±10% of regulated VOUT - provides reliable system-level power sequencing and fault detection. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during overload or poor PCB thermal design. |
| Soft-Start Time | 120µs - prevents inrush current and ensures controlled startup into pre-biased outputs. |
Pinout & Package
MP2119DQ-LF-P is housed in a thermally enhanced 3mm × 3mm QFN10 package with exposed pad (Pin 11) requiring direct connection to PCB ground plane for optimal thermal performance (θJA = 50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistive divider; compares against 0.8V internal reference to regulate VOUT. |
| 2,9 GND | Ground Return | Dual ground pins reduce impedance path for input/output capacitors and SW node return current. |
| 3,8 SW | Switch Node | Common connection point for internal high/low-side MOSFETs and external inductor. |
| 4,7 IN | Input Supply | Accepts 2.7–6V; requires local 10–47µF ceramic decoupling per pin for low-impedance switching current return. |
| 5 BS | Bootstrap Supply | Drives high-side gate via external 0.1µF capacitor to SW; enables N-channel high-side switch. |
| 6 POK | Open-Drain Power Good | Asserts LOW if VOUT deviates >±10%; 30µs deglitch prevents false triggering during transients. |
| 10 EN/SYNC | Enable & Sync Input | EN: logic-high >1.6V enables; <0.4V disables. SYNC: accepts 1–2MHz external clock for EMI reduction. |
| 11 Exposed Pad | Thermal & Electrical Ground | Mandatory solder connection to internal ground plane; critical for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor support | Eliminates need for electrolytic output caps - reduces board area, improves reliability, and avoids ESR-related loop instability. |
| Internal soft-start (120µs) | Prevents output overshoot and inrush stress on downstream loads; supports safe startup into pre-biased rails. |
| Hiccup-mode short-circuit protection | Shuts down and auto-restarts only after fault removal - avoids thermal runaway while maintaining system visibility. |
| Frequency synchronization input | Enables EMI reduction by locking switching noise to known frequency bands - critical for EMC-compliant designs. |
| Integrated 100mΩ HS/LS MOSFETs | Delivers >90% efficiency at 2A/1.8V out from 5V in - eliminates Schottky diode losses and associated layout complexity. |
Applications
| FPGA Core Power Supply | ASIC I/O Rail Regulation |
|---|---|
|
Use Scenario: Providing stable 1.0V–1.2V at up to 2A to Xilinx Artix-7 or Intel Cyclone V FPGA core logic under dynamic load steps. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering tightly regulated core voltage with fast transient response and ±10% POK monitoring. Use Value: Internal compensation and 1.5MHz switching enable sub-1mm² solution size; hiccup protection prevents damage during configuration faults. |
Use Scenario: Generating 1.8V/2A for high-speed SerDes I/O banks in telecom PHY devices operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Point-of-load regulator with EN/SYNC pin synchronized to system clock to suppress switching noise in sensitive analog sections. Use Value: 100mΩ MOSFETs sustain >92% efficiency at full load; thermal shutdown ensures reliability in sealed chassis environments. |
| Network Router PoL Converter | Industrial LCD Display Bias Supply |
|
Use Scenario: Converting 5V backplane to 3.3V/2A for Ethernet MAC/PHY SoCs in Layer 3 switches with strict EMI limits. IC Role / Device Role / Timing Role: Synchronized buck regulator whose 1–2MHz sync input aligns switching edges with system timing to avoid beat frequencies. Use Value: QFN10 package with exposed pad maintains junction temperature <115°C at 2A/3.3V out from 5V in on 4-layer PCB. |
Use Scenario: Powering TFT LCD panel gate drivers requiring clean 12V/1A bias rail derived from 24V industrial supply. IC Role / Device Role / Timing Role: Intermediate step-down stage feeding external charge pump; uses POK signal to validate upstream rail before enabling display sequencer. Use Value: Adjustable 0.8V–5.4V output covers common display bias voltages; all-ceramic design avoids aging-related capacitance drift. |
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 |
|---|---|---|---|
| RT7290BZSP | 2A, 1.2MHz, 2.5–5.5V input, 0.6V ref, no POK or sync input | Lacks power-good reporting and frequency synchronization - unsuitable for safety-critical or EMI-sensitive systems. | Select when cost sensitivity outweighs need for POK/sync and input range is limited to 2.5–5.5V. |
| TPS562201DDCR | 2A, 500kHz–1.7MHz adjustable freq, 4.5–17V input, 0.6V ref, POK, but larger 6-pin SOT-23 package | Wider VIN range trades off higher minimum input voltage; lower base frequency increases inductor size requirements. | Choose when input exceeds 6V or board space allows larger SOT-23 footprint and higher thermal resistance is acceptable. |
Compared with RT7290BZSP and TPS562201DDCR, MP2119DQ-LF-P uniquely combines 1.5MHz fixed frequency, 2.7–6V input, integrated POK, and QFN10 thermal performance - making it optimal for compact, noise-sensitive, and safety-monitored 2A PoL designs.
Availability
MP2119DQ-LF-P is available at Aetrix Electronics and suitable for FPGA core supplies, ASIC I/O regulators, network router point-of-load converters, and industrial LCD display bias circuits requiring stable component supply, RoHS compliance, and long-term lifecycle continuity.
Supply support for MP2119DQ-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 through authorized partners.
The MP2119 belongs to MPS's high-frequency synchronous buck regulator product line, engineered for space-constrained, efficiency-critical applications in computing, networking, and industrial electronics where minimal external components and robust protection features are essential.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2119DQ-LF-P requires ≥47µF ceramic output capacitance (X5R/X7R) for stable regulation and optimal transient response. Lower values risk loop instability and excessive output ripple; electrolytic alternatives require careful ESR-based feedback compensation redesign per datasheet Equation 1.
Can MP2119DQ-LF-P operate with a pre-biased output?
Yes - the IC disables switching until the internal soft-start capacitor voltage exceeds the sensed FB voltage, preventing reverse current flow into a pre-biased rail. This behavior is confirmed in the Functional Description section and validated across -40°C to +85°C operating range.
Is an external Schottky diode required for 2A operation?
No - the MP2119DQ-LF-P integrates synchronous rectification and operates efficiently at 2A without external diodes. However, a 0.5A/≥6V Schottky (e.g., B0530) placed near SW/GND is recommended to suppress voltage spikes and improve efficiency marginally at full load.
What is the maximum allowable duty cycle and how does it affect 5V-to-1.8V conversion?
The maximum duty cycle is 90%, limiting the lowest achievable output voltage to 0.9×VIN. For 5V input, this supports outputs down to 4.5V - but since MP2119DQ-LF-P uses adjustable feedback, 1.8V operation is fully supported via resistor divider scaling (e.g., R1=400kΩ, R2=316kΩ per Table 1).
How does the EN/SYNC pin behave when driven with a 1.5MHz square wave?
When a 1.5MHz square wave is applied, the MP2119DQ-LF-P synchronizes its internal oscillator to that frequency within one cycle, provided ON/OFF periods remain <4µs. If either period exceeds 4µs, the pin reverts to enable/disable mode, potentially disabling the device unexpectedly.
What thermal derating applies above +85°C ambient?
At TA = +105°C, the maximum continuous output current drops to ~1.6A due to thermal limits (θJA = 50°C/W, TJ(MAX) = 150°C). Derating follows PD(MAX) = (150 – TA)/50; at +105°C, max dissipation is 0.9W, corresponding to ~1.6A at 1.8V out from 5V in.
Does the POK output require an external pull-up resistor?
Yes - POK is open-drain and must be pulled up to a valid logic-high voltage (e.g., VOUT or system 3.3V rail) via a 10kΩ resistor. Without pull-up, the signal remains floating and cannot assert HIGH to indicate valid regulation.
MP2119DQ-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
- 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-P FAQ
1.How can I place an order for MP2119DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2119DQ-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 MP2119DQ-LF-P reliable?
The price and inventory of MP2119DQ-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 MP2119DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP2119DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2119DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2119DQ-LF-P?
MP2119DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2119DQ-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 MP2119DQ-LF-P?
For technical support, including MP2119DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2119DQ-LF-P requirements.
6.How does Aetrix verify that MP2119DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2119DQ-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 MP2119DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP2119DQ-LF-P?
All MP2119DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2119DQ-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 MP2119DQ-LF-P part is unused and in its original packaging.
Return procedure for MP2119DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP2119DQ-LF-P Tags
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MC34063EBD-TR
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