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Monolithic Power Systems Inc. MP28119EG-LF-P
- Part No.:
- MP28119EG-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP28119EG-LF-P.pdf
- Description:
- IC REG BUCK ADJ 600MA 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,194
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Product details
Overview
MP28119EG-LF-P from Monolithic Power Systems is a 1.7MHz constant-frequency, current-mode synchronous step-down DC/DC converter optimized for single-cell Li+-powered portable devices. It delivers up to 600mA load current from 2.5V–6V input, provides fixed 1.0V output (as indicated by the -1.0 suffix in MP28119EG-1.0), integrates main PFET and synchronous NFET switches, and supports 100% duty-cycle operation for low-dropout regulation.
For engineers reviewing the MP28119EG-LF-P datasheet, MP28119EG-LF-P pinout, MP28119EG-LF-P application, or MP28119EG-LF-P equivalent, key selection criteria include its ultra-small 2×2 mm QFN8 package, 0.6V feedback reference, <0.1μA shutdown current, output discharge function, and thermal/short-circuit protection - all critical for space-constrained, battery-sensitive designs.
Technical Context
The MP28119EG-LF-P implements slope-compensated current-mode PWM control with a fixed 1.7MHz oscillator, enabling stable regulation and cycle-by-cycle current limiting. Its internal architecture integrates both high-side PFET (RDS(on) = 0.42Ω) and low-side NFET (RDS(on) = 0.28Ω), eliminating external Schottky diodes and supporting high-efficiency operation up to 89%.
It features a dedicated output discharge MOSFET (100Ω on-resistance), EN pin with 1.5V turn-on/0.3V turn-off thresholds, and FB pin with 0.600V ±12mV reference voltage. The device operates across –20°C to +85°C and enters thermal shutdown at 145°C, with built-in short-circuit recovery via frequency and current limit reduction.
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 for minimal board area. |
| Max Output Current | 600 mA - Sustained load capability under 5V input; derates at lower VIN due to RDS(on) losses. |
| Input Voltage Range | 2.5 V to 6 V - Matches single-cell Li-ion (2.7–4.2V) and USB-powered systems with margin. |
| Output Voltage | Fixed 1.0 V - Tight tolerance (±3%) over temperature and load ensures reliable core supply for low-voltage logic. |
| Feedback Reference | 0.600 V ±12 mV - Sets precision output regulation; used with external resistor divider for adjustable versions. |
| Shutdown Current | <0.1 μA - Minimizes battery drain during system sleep modes in portable applications. |
| Thermal Shutdown | 145 °C - Protects die integrity; auto-recovery after cooldown prevents latch-up failure. |
Pinout & Package
MP28119EG-LF-P is housed in an ultra-small 2 mm × 2 mm, 8-pin QFN package with exposed thermal pad (connected to GND). The package complies with JEDEC MO-229 VCCD-3 and supports reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch node | Connection point for external inductor; ties drains of internal PFET and NFET - high dv/dt node requiring careful layout. |
| 2, 3 NC | No connection | Unbonded pins; must remain unconnected and not tied to any net to avoid parasitic coupling. |
| 4 EN | Enable control input | Logic-level enable: >1.5 V activates regulator; <0.3 V disables with sub-0.1 μA quiescent draw. |
| 5 FB | Feedback input | Senses regulated output via external resistor divider; 0.6 V reference enables precise VOUT setting (not used in fixed-output MP28119EG-1.0). |
| 6, 8 GND / Exposed Pad | Ground return & thermal path | Main power and signal ground; exposed pad must be soldered to PCB GND plane for thermal performance (θJA = 80°C/W). |
| 7 IN | Input supply | Primary power input (2.5–6 V); requires local 2.2 μF+ ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by ~5–10% vs. asynchronous designs. |
| 100% duty-cycle operation | Enables dropout regulation down to VIN ≈ VOUT + ILOAD × (RDS(on)_PFET + RDCR_L), critical for battery end-of-discharge. |
| Output discharge function | Internal 100 Ω MOSFET actively discharges VOUT capacitor when EN = low, preventing residual voltage from interfering with system reset sequencing. |
| Current-mode control with slope compensation | Ensures stability at >50% duty cycle and provides inherent cycle-by-cycle overcurrent protection without external sensing. |
| Short-circuit recovery behavior | Reduces switching frequency and PFET current limit during fault, then fully restores normal operation once FB ≥ 0.6 V - no manual reset required. |
Applications
| Cellular & Smartphones | Microprocessor Core Supplies |
|---|---|
|
Use Scenario: Powering application processor I/O or memory interface rails in compact smartphones with tight thermal budgets. IC Role / Device Role / Timing Role: Primary 1.0V core supply regulator delivering stable, low-noise DC from shared Li-ion battery rail. Use Value: Ultra-small 2×2 mm footprint saves PCB area; 89% peak efficiency extends talk time; output discharge ensures clean power-down sequencing. |
Use Scenario: Supplying low-voltage cores (e.g., ARM Cortex-A/M series) in portable embedded systems with dynamic voltage scaling. IC Role / Device Role / Timing Role: Fixed-output buck converter providing tightly regulated 1.0V domain supply synchronized to processor clock domains. Use Value: 0.6V feedback reference and current-mode control deliver fast transient response (<10 μs) to CPU load steps; 1.7MHz switching avoids audible noise. |
| Portable Digital Cameras | Wearable Health Sensors |
|
Use Scenario: Powering image sensor analog front-end and ISP logic in ultra-thin digital still/video cameras. IC Role / Device Role / Timing Role: High-efficiency, low-ripple DC/DC stage converting battery voltage to clean 1.0V sensor core supply. Use Value: Low 100 ns minimum on-time supports wide VIN-to-VOUT ratios; thermal shutdown protects against lens motor-induced ambient rise. |
Use Scenario: Regulating power for ultra-low-power MCU and biosensor ASICs in continuous glucose monitors or ECG patches. IC Role / Device Role / Timing Role: Always-on, low-quiescent buck converter maintaining 1.0V rail during multi-day battery operation with periodic wake-ups. Use Value: Sub-0.1 μA shutdown current minimizes standby loss; output discharge prevents back-powering of disabled sensors during firmware updates. |
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 | 1.8 MHz, 600 mA, 1.0 V fixed, 2.05 mm × 2.05 mm WSON-6; no output discharge; higher 2.5 μA quiescent current. | Lacks active output discharge and has higher shutdown current - unsuitable for strict power sequencing requirements. | Choose if footprint compatibility with WSON-6 is mandatory and discharge function is not needed. |
| Analog Devices ADP2119ACPZ-R7 | 1.6 MHz, 600 mA, 1.0 V fixed, 2 mm × 2 mm LFCSP-8; includes output discharge but uses 0.8 V FB reference. | Different feedback threshold alters external component values; thermal shutdown at 150°C vs. MP28119's 145°C. | Prefer when ADI ecosystem alignment or slightly higher thermal trip is acceptable. |
Compared with TPS62231DRYR and ADP2119ACPZ-R7, MP28119EG-LF-P uniquely combines sub-0.1 μA shutdown, integrated output discharge, and 1.7 MHz switching in a true 2×2 mm QFN8 - making it optimal for Li+-fed portable systems demanding minimal leakage and controlled power-down.
Availability
MP28119EG-LF-P is available at Aetrix Electronics and suitable for cellular phones, portable medical sensors, digital cameras, and microprocessor core supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP28119EG-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 manufacturing partnerships.
The MP28119 belongs to MPS's ultra-compact DC/DC converter product line, engineered specifically for space- and efficiency-critical battery-powered consumer electronics - emphasizing minimal footprint, low quiescent current, and robust protection features.
FAQ
What is the exact output voltage tolerance of MP28119EG-LF-P across temperature and load?
The MP28119EG-LF-P (fixed 1.0V version) maintains output voltage within ±3% (0.97 V to 1.03 V) over –20°C to +85°C ambient temperature and at 50 mA load, as specified in the Electrical Characteristics table. Load regulation adds ≤±10 mV deviation from 1 mA to 600 mA.
Does MP28119EG-LF-P require external compensation components?
No - MP28119EG-LF-P uses internal compensation optimized for standard 2.2 μH inductors and 4.7 μF/10 μF ceramic output capacitors. The datasheet confirms stable operation without external compensation networks for typical applications shown in Figure 3.
Can MP28119EG-LF-P operate with input voltage below 2.5V?
No - the absolute minimum input voltage is 2.5V per Recommended Operating Conditions. Below this, UVLO (2.15–2.45V rising threshold) disables the device, and functionality is not guaranteed. Operation at 2.4V may result in erratic startup or dropout.
How does the output discharge function behave during EN assertion?
When EN is pulled low, the internal discharge MOSFET (100 Ω) connects VOUT to GND, discharging the output capacitor with a time constant determined by COUT × 100 Ω. Discharge ceases automatically once VOUT falls below ~0.4 V, and the MOSFET turns off to prevent reverse current.
Is the exposed thermal pad electrically isolated or must it be grounded?
The exposed pad is internally connected to GND and must be soldered to a PCB GND plane. Per Package Information, it is not electrically isolated - connecting it to GND ensures both optimal thermal dissipation (θJA = 80°C/W) and electrical noise suppression.
What is the maximum achievable efficiency and under what conditions?
Peak efficiency reaches 89% at 300 mA load, 5 V input, and 1 V output (per Typical Performance Characteristics). Efficiency drops to ~82% at 600 mA due to conduction losses, and further at light loads (<10 mA) where switching losses dominate.
Does MP28119EG-LF-P support pre-bias start-up?
No - MP28119EG-LF-P does not support pre-bias start-up. If VOUT is externally held high during EN assertion, the internal discharge MOSFET may sink current, potentially causing conflict. External pre-bias sources must exceed the discharge MOSFET's sink capability (≈10–20 mA typical).
MP28119EG-LF-P 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-P FAQ
1.How can I place an order for MP28119EG-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP28119EG-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 MP28119EG-LF-P reliable?
The price and inventory of MP28119EG-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 MP28119EG-LF-P is usually 5 days.
3.What payment methods are accepted for MP28119EG-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP28119EG-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP28119EG-LF-P?
MP28119EG-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP28119EG-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 MP28119EG-LF-P?
For technical support, including MP28119EG-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP28119EG-LF-P requirements.
6.How does Aetrix verify that MP28119EG-LF-P is sourced from the original manufacturer or authorized distributors?
All MP28119EG-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 MP28119EG-LF-P meets industry standards.
7.What is the process for return or replacement of MP28119EG-LF-P?
All MP28119EG-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP28119EG-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 MP28119EG-LF-P part is unused and in its original packaging.
Return procedure for MP28119EG-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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