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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP2112DQ-LF-Z

Name: MP2112DQ-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP2112DQ-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2112DQ-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 6-VDFN Exposed Pad

Datasheet:: MP2112DQ-LF-Z.pdf

Description:: IC REG BUCK ADJ 1A 6QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP2112DQ-LF-Z 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 a 2.5V–6V input, regulates output down to 0.6V, supports 100% duty cycle for low-dropout operation, and achieves up to 95% efficiency-ideal for Li+-powered portable devices like smartphones and digital cameras.

For engineers reviewing the MP2112DQ-LF-Z datasheet, MP2112DQ-LF-Z pinout, MP2112DQ-LF-Z application, or MP2112DQ-LF-Z equivalent, key selection factors include its 1MHz fixed switching frequency, 0.6V feedback reference, thermal/short-circuit protection, and QFN6 (3mm × 3mm) package with exposed thermal pad.

Technical Context

The MP2112 employs slope-compensated current-mode control for stable regulation and cycle-by-cycle peak current limiting, enabling fast line/load transient response. Its dual-input VIN architecture (VINA for analog bias, VINB for power switch) isolates noise-sensitive circuitry from high-current paths.

It integrates a 0.42Ω PFET main switch and 0.26Ω NFET synchronous rectifier, eliminating external Schottky diodes. The device enters 100% duty cycle mode when input approaches output voltage, maintaining regulation with only R_DS(on) drop across the PFET.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	1MHz ±15% - enables compact LC filter design with ≤4.7μH inductors and ≤10μF ceramic output capacitors.
Max Output Current	1A continuous - sustained at V_IN ≥ 3.3V; derates at lower input due to R_DS(on) losses.
Feedback Voltage	0.600V ±1.5% - sets output via external resistor divider; tight tolerance ensures ±1% V_OUT accuracy over temperature.
Input Voltage Range	2.5V to 6V - matches single-cell Li+ (2.7–4.2V) and dual-cell alkaline/NiMH (up to 3.2V) battery systems.
Shutdown Current	<1μA - preserves battery life in standby; enabled via logic-level EN pin with 0.3–1.5V threshold.
Thermal Shutdown	145°C trip - protects die during overload or poor PCB thermal design; auto-recovery after cooldown.
Efficiency Peak	95% at 3.3V_IN/1.8V_OUT/500mA - achieved by synchronous rectification and low R_DS(on) FETs.

Pinout & Package

MP2112DQ-LF-Z uses a thermally enhanced 6-pin QFN package (3mm × 3mm, 0.5mm pitch) with an exposed thermal pad on the underside for PCB heat sinking.

Pin	Circuit Role	Design Meaning
1 (EN)	Enable Input	Active-high logic control; 0.3–1.5V threshold; pulls internal bias rails to disable switching and reduce I_Q to <1μA.
2 (GND)	Power Ground	Common return for analog and power circuits; must connect directly to thermal pad and 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 reduce noise coupling into control circuitry.
5 (VINA)	Analog Input	Bias supply for internal reference, error amp, and oscillator; less sensitive to ripple than VINB.
6 (FB)	Feedback Input	High-impedance (±50nA bias) node sensing resistor divider output; referenced to 0.6V internal bandgap.

Key Features

Feature	Design Value
Synchronous Rectification	Eliminates external Schottky diode, reducing conduction loss and board area; enables >90% efficiency at light loads.
100% Duty Cycle Operation	Maintains regulation when V_IN drops within ~200mV of V_OUT, critical for battery end-of-discharge in portable systems.
Integrated Slope Compensation	Prevents subharmonic oscillation above 50% duty cycle without external components, ensuring stability with standard LC filters.
Short-Circuit Foldback	Reduces switching frequency and PFET current limit during output short, limiting power dissipation and enabling safe auto-recovery.
Dual VIN Pins (VINA/VINB)	Separates analog bias and power switch supplies to suppress noise coupling from high di/dt SW node into control loop.

Applications

Smartphone Core Rail

Digital Camera Sensor Supply

Use Scenario: Powers ARM Cortex-A series application processor core (1.0–1.2V @ 800mA) from single-cell Li+ battery (3.0–4.2V).

IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering tightly regulated, low-noise core voltage with fast transient response to CPU burst loads.

Use Value: 95% peak efficiency extends talk time; 1MHz switching allows use of 2.2μH inductor and 10μF X5R ceramic capacitor, saving >30% board area vs. 500kHz solutions.

Use Scenario: Supplies image sensor analog front-end (2.8V @ 300mA) and digital I/O (1.8V @ 200mA) in compact digital still camera.

IC Role / Device Role / Timing Role: Dual-rail generator (with secondary LDO) providing low-ripple, low-noise bias for CMOS sensor pixel array and ADC interface.

Use Value: 0.6V FB reference enables precise 2.8V output via 1% resistors; thermal shutdown prevents damage during lens motor stall events.

Portable Medical Monitor

Wearable Fitness Tracker

Use Scenario: Regulates 3.3V system rail for microcontroller, OLED display, and Bluetooth LE radio in handheld patient monitor.

IC Role / Device Role / Timing Role: Main power converter operating across full battery range (2.7–4.2V), supporting 100% duty cycle during low-V_IN brownout.

Use Value: <0.1μA shutdown current preserves battery during sleep mode; QFN6 package fits 8mm × 8mm PCB space constraint.

Use Scenario: Generates 1.2V core voltage for ultra-low-power MCU (ARM Cortex-M0+) from coin-cell or thin-film battery (2.5–3.0V).

IC Role / Device Role / Timing Role: High-efficiency buck converter optimized for intermittent 10–100mA burst loads typical of sensor sampling and BLE advertising.

Use Value: 92% efficiency at 50mA enables >7-day runtime on CR2032; TSOT23-5 variant available for even smaller footprints.

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
TPS62231DRYR	3MHz switching frequency, 0.6V FB, but only 0.6A max output; no dual-VIN separation.	Higher f_SW enables smaller inductors but increases switching loss above 300mA; unsuitable for 1A continuous loads.	Select if board space is constrained and load ≤600mA; avoid for 1A Li+ applications requiring dropout headroom.
RT8059NGSP	1.5MHz f_SW, 0.6V FB, 1.2A rating, but lacks 100% duty cycle and has higher 2.5μA shutdown current.	No dropout support limits usable battery range; higher I_Q reduces shelf life in always-on wearables.	Choose for cost-sensitive designs where 100% duty cycle is not required and thermal margin exceeds 20°C.

Compared with TPS62231DRYR and RT8059NGSP, MP2112DQ-LF-Z uniquely combines 1A capability, 100% duty cycle, dual-VIN noise isolation, and sub-1μA shutdown-making it optimal for battery-powered systems demanding full voltage-range regulation and ultra-low quiescent power.

Availability

MP2112DQ-LF-Z is available at Aetrix Electronics and suitable for smartphone power management, portable medical instrumentation, digital camera sensor rails, and wearable fitness tracker core supplies requiring stable component supply across long production lifecycles.

Supply support for MP2112DQ-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.

The MP2112 belongs to MPS's high-efficiency DC-DC converter product line, engineered specifically for space-constrained, battery-operated portable electronics requiring wide input range, low quiescent current, and robust protection features.

FAQ

What is the minimum input voltage required for 1A output at 1.8V?

The MP2112DQ-LF-Z sustains 1A output at 1.8V down to approximately 2.7V input under typical conditions. Below 2.7V, current capability decreases due to increased conduction loss in the 0.42Ω PFET and 0.26Ω NFET. At 2.5V input, maximum continuous output current drops to ~750mA per thermal limits and voltage headroom requirements.

Can MP2112DQ-LF-Z operate without an external feedback resistor divider?

No. The MP2112DQ-LF-Z requires an external resistor divider connected between VOUT, FB, and GND to set the output voltage. The internal 0.6V reference is not internally connected to any output node; FB is a high-impedance input that must be biased externally. Omitting the divider results in unregulated, floating output voltage.

Is the exposed thermal pad on the QFN6 package electrically connected?

Yes-the exposed thermal pad on the MP2112DQ-LF-Z QFN6 package is internally connected to GND. It must be soldered to a solid copper thermal pad on the PCB and tied directly to the main ground plane to ensure proper thermal dissipation and electrical stability. Leaving it floating degrades thermal performance and may cause regulation instability.

How does short-circuit protection behave during sustained output fault?

During sustained short-circuit, the MP2112DQ-LF-Z reduces switching frequency and lowers the PFET current limit to ~1.2A (from nominal 1.9A), limiting power dissipation. Output voltage collapses, but the device remains powered and monitors FB. Once the short is removed and FB rises above 0.6V, normal operation resumes automatically without reset or latch-off.

What is the recommended PCB layout practice for VINA and VINB pins?

VINA and VINB must be decoupled separately: VINB requires a low-ESR ceramic capacitor (≥4.7μF) placed adjacent to the pin to handle high di/dt switching currents, while VINA needs a dedicated 1μF ceramic cap isolated from VINB's noisy return path. Both should route to GND through independent vias to minimize shared impedance and prevent control-loop injection.

Does MP2112DQ-LF-Z support forced PWM mode at light loads?

No. The MP2112DQ-LF-Z operates exclusively in PWM mode across all load conditions-it does not enter pulse-skipping or PFM mode. This ensures constant 1MHz switching frequency and predictable EMI profile, but results in reduced light-load efficiency compared to PFM-capable converters.

MP2112DQ-LF-Z 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-Z FAQ

1.How can I place an order for MP2112DQ-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2112DQ-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 MP2112DQ-LF-Z reliable?

The price and inventory of MP2112DQ-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 MP2112DQ-LF-Z is usually 5 days.

3.What payment methods are accepted for MP2112DQ-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2112DQ-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2112DQ-LF-Z?

MP2112DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2112DQ-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 MP2112DQ-LF-Z?

For technical support, including MP2112DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2112DQ-LF-Z requirements.

6.How does Aetrix verify that MP2112DQ-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP2112DQ-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 MP2112DQ-LF-Z meets industry standards.

7.What is the process for return or replacement of MP2112DQ-LF-Z?

All MP2112DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2112DQ-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 MP2112DQ-LF-Z part is unused and in its original packaging.

Return procedure for MP2112DQ-LF-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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