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Monolithic Power Systems Inc. MP28119EG-LF-Z
- Part No.:
- MP28119EG-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP28119EG-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 600MA 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,146
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Product details
Overview
MP28119EG-LF-Z from Monolithic Power Systems is a 1.7MHz constant-frequency, current-mode synchronous step-down DC/DC converter in a 2×2 mm QFN-8 package. It delivers up to 600mA load current from a 2.5V–6V input, provides fixed 1.0V output (as indicated by the -1.0 suffix in the base part), integrates main PFET and synchronous NFET switches, supports 100% duty cycle for low-dropout operation, and includes output discharge functionality for controlled power-down sequencing in portable Li+-battery-powered systems.
For engineers reviewing the MP28119EG-LF-Z datasheet, MP28119EG-LF-Z pinout, MP28119EG-LF-Z application, or MP28119EG-LF-Z equivalent, this device is selected for ultra-compact, high-efficiency core voltage regulation where input-to-output differential is minimal, thermal constraints are tight, and shutdown leakage (<0.1μA) and fast transient response under dynamic load are critical design requirements.
Technical Context
The MP28119EG-LF-Z implements slope-compensated current-mode PWM control with a fixed 1.7MHz oscillator, enabling stable regulation and cycle-by-cycle current limiting across line and load variations. Its internal feedback reference is precisely trimmed to 0.600V (±2%), and it uses an integrated resistor divider to fix VOUT at 1.0V - eliminating external FB resistors and simplifying layout.
It operates down to 2.5V input while maintaining full 600mA capability, achieves 100% duty cycle during dropout, and incorporates dedicated circuitry to activate an internal discharge MOSFET upon EN deactivation - discharging the output capacitor through a 100Ω path to prevent floating rail conditions during system reset or sleep transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.7 MHz - enables use of small 2.2 μH inductors and compact ceramic capacitors, reducing board area by >40% vs. 500 kHz converters. |
| Max Output Current | 600 mA - sufficient for powering single-core microprocessors, DSPs, or RF subsystems from a single Li+ cell without thermal derating at TA ≤ +85°C. |
| Input Voltage Range | 2.5 V to 6 V - covers full discharge curve of 1-cell Li-ion (3.0–4.2 V nominal) plus margin for USB-powered or dual-supply backup scenarios. |
| Fixed Output Voltage | 1.0 V ±3% - factory-trimmed for core logic supply in mobile SoCs; eliminates external resistor network and associated layout sensitivity. |
| Shutdown Current | <0.1 μA - ensures negligible battery drain during deep-sleep modes in always-on sensor nodes or wearable devices. |
| Thermal Shutdown Threshold | 145 °C - protects die integrity during sustained overload or poor PCB copper pour; auto-recovery after cooldown. |
| Efficiency Peak | 89% at 300 mA / 5 VIN → 1 VOUT - minimizes power loss and heat generation in thermally constrained enclosures such as smartphones or earbuds. |
Pinout & Package
MP28119EG-LF-Z is housed in a thermally enhanced 2 mm × 2 mm, 0.4 mm pitch QFN-8 package with exposed thermal pad (connected to GND). The package meets JEDEC MO-229 VCCD-3 standard and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace and adjacent ground pour for EMI control. |
| 2, 3 NC | No connection | Internally unconnected; must remain floating - no routing or solder mask opening required. |
| 4 EN | Enable control input | Logic-level input with 1.5 V turn-on / 0.3 V turn-off thresholds; drives internal bias circuits and discharge FET activation. |
| 5 FB / OUT | Feedback or output sense | In MP28119EG-1.0 variant, this pin connects to internal fixed-divider - not used externally; bypass with 10 nF if unused. |
| 6, 8 GND | Ground reference | Primary signal and power return; exposed pad (Pin 6/8) must be soldered to ≥2 cm² internal/external GND plane for θJA = 80°C/W. |
| 7 IN | Input supply | Accepts 2.5–6 V; requires local 4.7 μF X5R/X7R ceramic capacitor placed within 2 mm of pin for low-impedance high-frequency decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated PFET (0.42 Ω RDS(on)) + NFET (0.28 Ω RDS(on)) eliminates external Schottky diode, improving efficiency by 8–12% at light loads. |
| Output discharge function | Internal 100 Ω discharge MOSFET activates automatically on EN=LOW, discharging VOUT to <100 mV within 10 ms - prevents back-powering of upstream rails. |
| 100% duty cycle operation | Enables dropout mode when VIN ≈ VOUT; maintains regulation down to VIN = 2.5 V with only ~120 mV drop across internal switches at 600 mA. |
| Short-circuit protection | Reduces switching frequency and lowers PFET current limit during fault; recovers autonomously once VFB rises above 0.6 V - no latch-up or manual reset needed. |
| Ultra-small footprint | 2 mm × 2 mm QFN-8 occupies just 4 mm² PCB area - ideal for space-constrained modules like Bluetooth LE audio transceivers or optical sensor subassemblies. |
Applications
| Smartphone Application Processor Core Supply | Digital Camera Image Sensor Bias Rail |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU cores in entry-tier smartphones operating from single-cell Li-ion battery (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 1.0 V core voltage with fast load transient response to handle burst-mode CPU activity. Use Value: Enables 600 mA peak current delivery with <10 mV output deviation during 0→600 mA 1 μs load steps - preserving timing margins in high-speed memory interfaces. |
Use Scenario: Supplies clean, low-noise 1.0 V bias to CMOS image sensor analog front-end (AFE) and column ADC in compact digital still cameras. IC Role / Device Role / Timing Role: Low-ripple, low-EMI power source with output discharge to ensure sensor reset integrity between capture frames. Use Value: Achieves <15 mVPP output ripple at 600 mA (fSW = 1.7 MHz), minimizing quantization noise in 12-bit image data paths. |
| Wearable Fitness Tracker MCU Core Rail | Bluetooth Audio Earbud DSP Supply |
|
Use Scenario: Provides regulated 1.0 V supply to ultra-low-power MCU (e.g., Nordic nRF52832) in wrist-worn fitness trackers with multi-day battery life. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting dynamic voltage scaling and deep-sleep modes with sub-μA quiescent draw. Use Value: Delivers 89% peak efficiency at 10 mA and <0.1 μA shutdown current - extending battery runtime by >18% vs. legacy linear regulators. |
Use Scenario: Powers DSP and codec subsystem in true wireless stereo (TWS) earbuds where board space and thermal headroom are severely limited. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage replacing discrete solutions to meet IEC 62368-1 surface temperature limits. Use Value: 2×2 mm QFN package with exposed pad reduces junction-to-ambient thermal resistance to 80°C/W - keeping die temp <85°C at full 600 mA load. |
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 |
|---|---|---|---|
| TI TPS62231DRYR | 1.7 MHz, 600 mA, 1.0 V fixed, 2.05 mm × 2.05 mm DSBGA-6 - lacks output discharge and 100% duty cycle support. | Requires external discharge circuit for pre-bias safety; unsuitable for ultra-low-VIN dropout scenarios below 2.7 V. | Select when board-level discharge control is already implemented and footprint tolerance allows DSBGA handling. |
| Analog Devices ADP2119ACPZ-R7 | 1.2 MHz, 600 mA, adjustable via FB, 2 mm × 2 mm LFCSP-8 - includes soft-start but no integrated output discharge MOSFET. | Needs external RC network for controlled discharge; lower switching frequency increases inductor size by ~35% for same ripple. | Prefer when adjustable output (0.6–5.5 V) and soft-start sequencing are mandatory, and discharge is managed elsewhere. |
Compared with TPS62231DRYR and ADP2119ACPZ-R7, MP28119EG-LF-Z uniquely combines fixed 1.0 V output, 100% duty cycle, and autonomous output discharge in a QFN-8 - reducing BOM count by two passive components and enabling simpler, more reliable power-down behavior in battery-constrained designs.
Availability
MP28119EG-LF-Z is available at Aetrix Electronics and suitable for smartphone core supplies, wearable MCU rails, digital camera sensor biasing, and Bluetooth audio DSP power delivery requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP28119EG-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 over 20 years of leadership in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP28119 belongs to MPS's ultra-compact, high-frequency buck converter product line, designed specifically for space- and efficiency-critical portable electronics powered by single-cell Li-ion batteries.
FAQ
What is the maximum recommended PCB copper area for the exposed thermal pad of MP28119EG-LF-Z?
The exposed pad (Pins 6 and 8) must be soldered to a minimum 2 cm² continuous GND copper pour on at least one internal layer. For optimal thermal performance (θJA = 80°C/W), connect the pad to ≥4 cm² total GND area using ≥4 thermal vias (0.3 mm diameter, filled or capped) spaced evenly under the pad.
Can MP28119EG-LF-Z operate with an input voltage below 2.5 V?
No - the absolute minimum input voltage is 2.5 V per the Recommended Operating Conditions table. Below this, UVLO remains active (threshold = 2.15–2.45 V rising edge), preventing startup. Operation below 2.5 V risks undefined behavior and is not characterized or guaranteed.
Is the 1.0 V output voltage adjustable using external resistors?
No - MP28119EG-LF-Z is the fixed-output variant (MP28119EG-1.0). Its FB/OUT pin connects internally to a precision resistor divider; external resistor networks are incompatible and will disrupt regulation. For adjustable output, use MP28119EG (no suffix) instead.
Does the output discharge function activate during normal operation or only at shutdown?
The output discharge MOSFET activates exclusively when EN is driven below 0.3 V (shutdown state). It does not engage during normal regulation, light-load pulse-skipping, or transient events - ensuring stable output during active operation.
What is the typical inductor value recommended for MP28119EG-LF-Z in a 5 VIN → 1 VOUT application?
A 2.2 μH shielded power inductor with ≥800 mA saturation current and <200 mΩ DCR is recommended. This value balances ripple current (~180 mA peak-to-peak), efficiency (>87% at 300 mA), and physical size - matching the typical application circuit in the datasheet.
How does the MP28119EG-LF-Z respond to a short-circuit event on its output?
Upon short-circuit detection, the device reduces switching frequency and lowers the PFET current limit to ~0.8 A. This limits fault current and power dissipation. Once the short is removed and FB voltage recovers to ≥0.6 V, normal operation resumes automatically without requiring EN toggling or external intervention.
MP28119EG-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TFDFN 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:
- 600mA
- Frequency - Switching:
- 1.7MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x2)
MP28119EG-LF-Z FAQ
1.How can I place an order for MP28119EG-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP28119EG-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 MP28119EG-LF-Z reliable?
The price and inventory of MP28119EG-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 MP28119EG-LF-Z is usually 5 days.
3.What payment methods are accepted for MP28119EG-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP28119EG-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP28119EG-LF-Z?
MP28119EG-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP28119EG-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 MP28119EG-LF-Z?
For technical support, including MP28119EG-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP28119EG-LF-Z requirements.
6.How does Aetrix verify that MP28119EG-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP28119EG-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 MP28119EG-LF-Z meets industry standards.
7.What is the process for return or replacement of MP28119EG-LF-Z?
All MP28119EG-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP28119EG-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 MP28119EG-LF-Z part is unused and in its original packaging.
Return procedure for MP28119EG-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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