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Monolithic Power Systems Inc. MP2112DQ-LF-P
- Part No.:
- MP2112DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
MP2112DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1A 6QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,339
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Product details
Overview
MP2112DQ-LF-P from Monolithic Power Systems is a 1MHz constant-frequency, current-mode PWM synchronous step-down converter with integrated high-side PFET and low-side NFET switches. It delivers up to 1A load current from 2.5V–6V input, regulates output down to 0.6V, supports 100% duty cycle for low-dropout operation, and achieves up to 95% efficiency in portable Li+-powered systems such as smartphones and digital cameras.
For engineers reviewing the MP2112DQ-LF-P datasheet, MP2112DQ-LF-P pinout, MP2112DQ-LF-P application, or MP2112DQ-LF-P equivalent, key selection criteria include its 1MHz fixed switching frequency, 0.6V feedback reference voltage, thermal shutdown at 145°C, short-circuit protection with frequency foldback, and QFN6 (3mm × 3mm) package with exposed thermal pad.
Technical Context
The MP2112DQ-LF-P implements slope-compensated current-mode control for stable regulation and cycle-by-cycle overcurrent protection. Its dual-input VIN architecture separates analog (VINA) and power (VINB) rails to reduce noise coupling into the error amplifier and reference circuitry.
It operates in continuous conduction mode (CCM) across full load range and transitions seamlessly to 100% duty cycle when input approaches output voltage-enabling ultra-low dropout performance without external diode or controller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1MHz ±15% - Enables compact LC filter design with ≤4.7μH inductors and ceramic capacitors. |
| Feedback Voltage | 0.600V ±12mV - Sets precise output regulation point; used with external resistor divider for adjustable VOUT. |
| Input Voltage Range | 2.5V to 6V - Matches single-cell Li-ion (3.0–4.2V) and dual-cell alkaline/NiMH (2.4–3.6V) battery inputs. |
| Output Current | 1A continuous - Sustains full rated load at TA = +85°C in QFN6 package with proper PCB thermal layout. |
| Shutdown Current | <1μA - Minimizes battery drain during system sleep modes in portable devices. |
| Thermal Shutdown | 145°C trip - Internal protection disables switching until junction cools below hysteresis threshold (~130°C). |
| PFET RDS(on) | 0.42Ω max - Limits conduction loss at light-to-moderate loads; complements NFET's 0.26Ω RDS(on). |
Pinout & Package
MP2112DQ-LF-P uses a thermally enhanced 6-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad on underside for PCB heat dissipation. Package meets JEDEC MO-229 VEEA-2 standard and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable Input | Active-high logic control; threshold 0.3–1.5V; pulls internal bias off when low to halt switching and reduce IQ to <1μA. |
| 2 (GND) | Power Ground | Common return for power switches, error amplifier, and internal reference; must connect to low-impedance ground plane. |
| 3 (SW) | Switch Node | Drain connection of internal PFET/NFET; drives external inductor; requires tight layout to minimize EMI and ringing. |
| 4 (VINB) | Power Input | High-current path for main switch supply; decoupled separately from VINA to isolate power noise from analog circuitry. |
| 5 (VINA) | Analog Input | Bias supply for error amp, reference, and oscillator; lower-noise rail improves regulation accuracy and transient response. |
| 6 (FB) | Feedback Input | High-impedance node sensing resistor divider midpoint; 0.6V reference enables output setting from 0.6V to 6V. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated NFET replaces Schottky diode-eliminates 0.3–0.5V forward drop and improves light-load efficiency by >15%. |
| 100% duty cycle operation | Enables dropout <100mV at 1A-critical for maintaining core voltage during Li+ battery sag near end-of-discharge. |
| Short-circuit protection | Reduces switching frequency and lowers PFET current limit during fault-limits peak inductor current to ~1.2A and prevents thermal runaway. |
| Separate VINA/VINB inputs | Isolates analog reference and control circuitry from power-switch noise-reduces output ripple and improves PSRR by >20dB at 1MHz. |
| Thermal fault protection | Die temperature sensing shuts down all switching stages above 145°C-prevents permanent damage under sustained overload or poor heatsinking. |
Applications
| Smartphone Core Supply | Digital Camera Sensor Rail |
|---|---|
Use Scenario: Powers ARM Cortex-A series application processor cores requiring stable 1.0–1.2V at up to 1A during burst video capture. IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering regulated core voltage with fast transient response to CPU load steps. Use Value: 1MHz switching enables use of small 4.7μH inductors and 4.7μF X5R ceramics-reducing solution footprint by 35% vs. 500kHz alternatives. | Use Scenario: Supplies image sensor analog front-end (AFE) with low-noise 2.8V rail in compact camera modules. IC Role / Device Role / Timing Role: Low-ripple, high-PSRR buck converter operating in forced CCM to suppress switching artifacts in analog signal chain. Use Value: Separate VINA/VINB inputs and 0.6V FB reference enable tight output tolerance (±1.5%) and <10mVpp ripple at 1A load. |
| Portable Medical Monitor | Bluetooth Audio SoC |
Use Scenario: Provides 3.3V system rail for microcontroller, display driver, and ADC in handheld patient monitors. IC Role / Device Role / Timing Role: Main power stage supporting wide input range (2.5–6V) to accommodate primary lithium or USB-powered operation. Use Value: 100% duty cycle maintains regulation down to 3.4V input-extending usable battery life by ~18 minutes at end-of-discharge. | Use Scenario: Generates 1.2V core voltage for Bluetooth 5.0 SoC with dynamic DVFS scaling between 0.1A–0.9A loads. IC Role / Device Role / Timing Role: Efficient, low-quiescent-current buck regulator enabling >12-hour playback on single Li+ cell. Use Value: <1μA shutdown current and 95% peak efficiency at 0.5A allow standby current budget to remain under 2μA system-wide. |
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 |
|---|---|---|---|
| TPS62231DRVR | Fixed 3.3V output; no adjustable FB; 3.6V max VIN; 0.65V FB reference | Not suitable for variable-output or sub-3.3V designs; lacks 100% duty cycle | Select only if fixed 3.3V output and lower VIN range are acceptable |
| RT8059ZSP | 2.5V–5.5V VIN; 0.6V FB; but 3MHz switching and 0.6A max IOUT | Higher frequency enables smaller passives but limits max load to 0.6A; no 100% duty cycle | Prefer for space-constrained, low-power apps where 1A is not required |
Compared with TPS62231DRVR and RT8059ZSP, MP2112DQ-LF-P uniquely combines 1A capability, 0.6V adjustable output, 100% duty cycle, and dual-VIN noise isolation-making it optimal for Li+-fed portable systems demanding both flexibility and robustness.
Availability
MP2112DQ-LF-P is available at Aetrix Electronics and suitable for smartphone core supplies, digital camera sensor rails, portable medical monitors, Bluetooth audio SoCs, and other battery-powered embedded systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for MP2112DQ-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, motor drive, and automotive applications.
The MP2112 belongs to MPS's high-efficiency DC/DC converter product line, designed specifically for space- and power-constrained portable electronics powered by single-cell Li-ion batteries.
FAQ
What is the function of separate VINA and VINB pins on MP2112DQ-LF-P?
VINA supplies clean bias to the internal error amplifier, reference, and oscillator, while VINB powers the high-current PFET/NFET switches. This separation reduces noise coupling from switching transients into analog circuitry-improving output voltage accuracy, PSRR, and transient response stability without requiring additional filtering components.
Does MP2112DQ-LF-P support forced continuous conduction mode (FCCM)?
No-MP2112DQ-LF-P operates exclusively in pulse-width modulation (PWM) mode with current-mode control and does not include a dedicated FCCM pin or mode-select feature. It remains in CCM across full load range but transitions to discontinuous conduction mode (DCM) only under very light loads (<10mA), where efficiency is maintained via reduced switching losses.
Can MP2112DQ-LF-P be used with ceramic output capacitors only?
Yes-MP2112DQ-LF-P is fully compatible with X5R/X7R ceramic output capacitors. Its internal compensation is optimized for low-ESR ceramics; recommended values are 4.7μF–10μF. Aluminum polymer or tantalum caps are unnecessary and may destabilize the loop due to higher ESR and ESL mismatch.
What is the minimum recommended inductor value for MP2112DQ-LF-P at 1A load?
The minimum recommended inductor is 1μH, but 4.7μH is preferred for optimal efficiency and ripple performance at 1A. Inductor saturation current must exceed 1.25×IOUT (≥1.25A), and DC resistance should be ≤200mΩ to limit conduction losses. Coilcraft D63CB and Toko D53LC are validated 4.7μH options.
How does short-circuit protection behave on MP2112DQ-LF-P?
Under output short, MP2112DQ-LF-P reduces switching frequency and lowers the PFET current limit to ~1.2A. This limits peak inductor current and die temperature rise. Recovery occurs automatically once the short is removed and FB voltage rises above 0.6V-no latch or manual reset is required.
Is the exposed thermal pad on MP2112DQ-LF-P electrically connected internally?
No-the exposed thermal pad is not electrically connected to any internal node. It is a mechanical thermal interface only and must be soldered to a large copper pour on the PCB for effective heat dissipation. Electrical connection to GND is optional but recommended for improved thermal and EMI performance.
What is the maximum achievable output voltage accuracy over temperature?
Over –40°C to +85°C, the FB voltage is specified as 0.588V to 0.612V (±2%), translating to ±2% output voltage accuracy when using precision resistors. At +25°C, typical FB is 0.600V ±1%, enabling ±1% output tolerance with 1% resistors in stable ambient conditions.
MP2112DQ-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 6-VDFN 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):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.05MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-QFN (3x3)
MP2112DQ-LF-P FAQ
1.How can I place an order for MP2112DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2112DQ-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 MP2112DQ-LF-P reliable?
The price and inventory of MP2112DQ-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 MP2112DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP2112DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2112DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2112DQ-LF-P?
MP2112DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2112DQ-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 MP2112DQ-LF-P?
For technical support, including MP2112DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2112DQ-LF-P requirements.
6.How does Aetrix verify that MP2112DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2112DQ-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 MP2112DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP2112DQ-LF-P?
All MP2112DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2112DQ-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 MP2112DQ-LF-P part is unused and in its original packaging.
Return procedure for MP2112DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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