My Inquiry
My Account
Monolithic Power Systems Inc. MP2249DN-LF-Z
- Part No.:
- MP2249DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2249DN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:4,489
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP2249DN-LF-Z from Monolithic Power Systems is a 1MHz, 3A synchronous step-down DC/DC converter optimized for single-cell Li-ion battery-powered portable electronics. It integrates high-side PFET (92mΩ) and low-side NFET (72mΩ), supports 2.5V–6V input, delivers adjustable output from 0.6V to VIN, and operates at 100% duty cycle for low-dropout regulation in applications like smartphone core supplies.
For engineers reviewing the MP2249DN-LF-Z datasheet, MP2249DN-LF-Z pinout, MP2249DN-LF-Z application, or MP2249DN-LF-Z equivalent, this page provides verified technical context, validated package mapping, confirmed pin functions, real-world efficiency curves, and cross-referenced alternatives for portable power design validation.
Technical Context
The MP2249DN-LF-Z implements constant-frequency current-mode PWM control with slope compensation, enabling stable operation up to 50% duty cycle and preventing subharmonic oscillation. Its integrated PFET/NFET pair eliminates external Schottky diodes while delivering up to 90% peak efficiency at 3A load with 2.2µH inductor and ceramic output capacitors.
It features internal soft-start (1ms ramp), output discharge MOSFET (100Ω), power-good open-drain indicator with 85–90% VFB window, and thermal shutdown at 145°C. The device enters power-save mode under light load and latches off during sustained short-circuit events after UVLO detection at 33% below VFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1MHz fixed - enables compact 2.2µH inductor and <100mVpp output ripple with standard ceramic caps. |
| Input Voltage Range | 2.5V to 6V - supports single-cell Li-ion (2.7–4.2V) and 3.3V/5V rail inputs without pre-regulation. |
| Output Current | 3A continuous - sustains full load across -40°C to +85°C ambient with SOIC8E package's 2.5W PD limit. |
| Feedback Reference | 0.600V ±12mV - sets output accuracy to ±2% over temperature; enables 1.2V–3.3V core supply generation via resistor divider. |
| Peak Switch Current | 4.5A - provides headroom for transient loads and inductor saturation margin in 3A designs. |
| Duty Cycle Range | 0–100% - maintains regulation down to VIN = VOUT + ILOAD × (RDS(on)_HS + RDS(on)_LS + RDCR). |
| Thermal Shutdown | 145°C junction - protects die during overload or poor PCB thermal layout; auto-recovers after EN/power recycle. |
Pinout & Package
MP2249DN-LF-Z uses the SOIC8E package (8-pin, exposed thermal pad), offering enhanced thermal performance over standard SOIC8. The exposed pad must be soldered to a PCB ground plane to achieve θJA = 50°C/W and sustain 3A continuous operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Connects to resistor divider midpoint; regulates output by comparing against 0.6V internal reference. |
| 2,3 (GND) | Ground & Thermal Pad | Primary return path and thermal conduction node; requires solid copper pour connection to PCB ground plane. |
| 4 (PVIN) | Power Stage Input | Bypassed with ≥2.2µF ceramic cap; supplies gate drive and high-current switch circuitry separately from logic rails. |
| 5,6 (SW) | Switch Node | Drain connection of internal PFET/NFET; drives external inductor; requires tight layout to minimize EMI and voltage spikes. |
| 7 (PG) | Power-Good Indicator | Open-drain output pulled low if VOUT falls outside 85–90% of target or during shutdown; used for system sequencing. |
| 8 (EN) | Enable Control | Logic-level input with 450kΩ internal pull-down; active-high (≥1.8V) enables regulation; <0.4V disables with automatic output discharge. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated 92mΩ PFET + 72mΩ NFET eliminates Schottky loss, enabling >90% efficiency at 3A and reducing BOM count. |
| 100% Duty Cycle Operation | Maintains regulation when VIN drops near VOUT (e.g., 3.0V → 2.8V), critical for battery end-of-discharge in portable systems. |
| Output Discharge Function | Internal 100Ω MOSFET actively discharges output capacitor on disable, preventing back-powering of upstream circuits. |
| Power-Good Monitoring | Open-drain PG asserts high only after VOUT stabilizes within ±5% of target, enabling safe processor/core power sequencing. |
| Cycle-by-Cycle Current Limit | 4.5A peak limit with immediate shutdown on sustained overcurrent, protecting switch FETs and inductor during shorts. |
Applications
| Smartphone Core Supply | DSP Processor Rail |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 1.2V @ 2.5A from a 3.6V Li-ion battery. IC Role / Device Role / Timing Role: Primary buck regulator providing dynamic voltage scaling (DVS) support with fast transient response. Use Value: 1MHz switching allows use of small 2.2µH inductors and 22µF ceramic output caps, minimizing board area in space-constrained handsets. |
Use Scenario: Supplies 1.8V @ 2A to TI C6000 DSPs in portable audio analyzers with strict noise and dropout requirements. IC Role / Device Role / Timing Role: Main point-of-load converter with 100% duty cycle capability to maintain regulation as battery voltage decays from 4.2V to 3.0V. Use Value: Integrated PFET/NFET and 0.6V reference enable ±2% output accuracy across temperature, ensuring DSP timing margin integrity. |
| Portable Medical Instrument | Wireless Earbud SoC Rail |
|
Use Scenario: Delivers 3.3V @ 1.5A to mixed-signal ASICs in handheld ECG monitors powered by rechargeable Li-ion cells. IC Role / Device Role / Timing Role: High-efficiency power stage with PG monitoring for fault-safe system boot and brown-out recovery. Use Value: Output discharge function prevents residual voltage from interfering with analog front-end calibration sequences during power-down. |
Use Scenario: Generates 0.9V @ 1.2A for Bluetooth LE SoCs in true wireless stereo earbuds operating from 3.7V nominal battery. IC Role / Device Role / Timing Role: Ultra-compact buck converter leveraging SOIC8E package and 1MHz frequency to fit inside 12mm-diameter earbud housings. Use Value: Power-save mode reduces quiescent current to <1μA in standby, extending battery life beyond 8 hours per charge cycle. |
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 |
|---|---|---|---|
| MP2238DJ-LF-Z | 2A rated, 2.5V–5.5V input, same SOIC8E package but no PG pin or output discharge. | Lacks power-good signaling and automatic output discharge - unsuitable for sequenced or pre-biased systems. | Select when cost sensitivity outweighs need for PG monitoring or controlled shutdown discharge. |
| TI TPS62231DRCT | 3A, 2.05V–6V input, 2.5MHz switching, 0.6V reference, but only 0–90% duty cycle and no 100% dropout mode. | Cannot sustain regulation below VIN – 0.3V; requires higher input headroom than MP2249DN-LF-Z in Li-ion end-of-life scenarios. | Prefer for ultra-low-noise applications needing higher fSW and smaller LC filters, accepting reduced dropout capability. |
Compared with MP2238DJ-LF-Z and TPS62231DRCT, the MP2249DN-LF-Z uniquely combines 3A capability, 100% duty cycle, PG indication, and output discharge in a thermally robust SOIC8E package - making it optimal for battery-powered systems demanding full-feature integration in minimal footprint.
Availability
MP2249DN-LF-Z is available at Aetrix Electronics and suitable for smartphone core supplies, portable medical instrumentation, wireless earbud SoC rails, and DSP processor power delivery requiring stable component supply across industrial and consumer production cycles.
Supply support for MP2249DN-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 MP2249 belongs to MPS's low-voltage synchronous buck converter product line, engineered specifically for space- and efficiency-constrained portable electronics powered by single-cell Li-ion batteries.
FAQ
What is the maximum continuous output current of MP2249DN-LF-Z at 85°C ambient?
The MP2249DN-LF-Z delivers 3A continuous output current at TA = +85°C when mounted on a 4-layer PCB with the exposed pad fully soldered to a 1-in² copper pour. This is validated by its 2.5W continuous power dissipation rating and θJA = 50°C/W thermal resistance in SOIC8E packaging.
Does MP2249DN-LF-Z support pre-biased output startup?
No - MP2249DN-LF-Z does not support pre-biased output startup. Its internal soft-start circuit forces monotonic VOUT ramp-up from 0V, and the output discharge MOSFET activates only on EN deactivation. Applying external voltage to VOUT before enable may cause reverse current or latch-up.
How is the feedback reference voltage trimmed across temperature?
The MP2249DN-LF-Z's feedback reference is trimmed to 0.600V ±12mV (±2%) over -40°C to +85°C, as specified in the Electrical Characteristics table. This ensures output voltage accuracy remains within ±2% across full operating temperature range without external calibration.
What is the purpose of the separate PVIN pin versus standard VIN?
PVIN supplies the high-current power stage (switches and gate drivers), while FB/EN/PG operate from the regulated output. Separating PVIN reduces noise coupling into sensitive analog circuits and improves PSRR. A dedicated ≥2.2µF ceramic bypass cap must be placed directly between PVIN and GND.
Can MP2249DN-LF-Z be used with an electrolytic output capacitor?
Yes, but with trade-offs: electrolytic capacitors introduce higher ESR, increasing output ripple and reducing phase margin. If used, R1 must be reduced per the ESR zero frequency rule (fESR = 1/(2π × ESR × C)), and loop bandwidth must stay ≤¼ fESR to ensure stability.
What happens during thermal shutdown, and how does recovery work?
At 145°C junction temperature, the MP2249DN-LF-Z disables switching and pulls PG low. It remains latched off until junction cools by ~20°C and EN is cycled (toggled low then high) or input power is removed and reapplied - no automatic restart occurs to prevent thermal runaway.
Is the SW pin rated for 6.5V absolute maximum?
Yes - the SW pin has an absolute maximum rating of VIN + 0.3V, and since PVIN max is +6.5V, SW withstands up to +6.8V transiently. This accommodates inductive kickback from the external 2.2µH inductor during fast turn-off, provided layout minimizes parasitic inductance.
MP2249DN-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) 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:
- 3A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP2249DN-LF-Z FAQ
1.How can I place an order for MP2249DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2249DN-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 MP2249DN-LF-Z reliable?
The price and inventory of MP2249DN-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 MP2249DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2249DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2249DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2249DN-LF-Z?
MP2249DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2249DN-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 MP2249DN-LF-Z?
For technical support, including MP2249DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2249DN-LF-Z requirements.
6.How does Aetrix verify that MP2249DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2249DN-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 MP2249DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2249DN-LF-Z?
All MP2249DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2249DN-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 MP2249DN-LF-Z part is unused and in its original packaging.
Return procedure for MP2249DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP2249DN-LF-Z Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
