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Monolithic Power Systems Inc. MP2151GQFU-18-P
- Part No.:
- MP2151GQFU-18-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 6-UFDFN
- Datasheet:
-
MP2151GQFU-18-P.pdf
- Description:
- IC REG BUCK 1.8V 1A 6UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,071
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Product details
Overview
MP2151GQFU-18-P from Monolithic Power Systems is a fixed-output 1.8V, 1A synchronous step-down DC/DC converter in a 1.2mm × 1.6mm UTQFN package. It operates from 2.5V–5.5V input, delivers ±1% output accuracy over temperature, features 25μA quiescent current, 1.1MHz switching frequency, and integrated output discharge. It powers low-voltage I/O rails in portable instrumentation and battery-powered devices.
For engineers reviewing the MP2151GQFU-18-P datasheet, MP2151GQFU-18-P pinout, MP2151GQFU-18-P application, or MP2151GQFU-18-P equivalent, key selection criteria include its ultra-low IQ for battery longevity, fixed 1.8V output with PG indicator, thermal shutdown at 160°C, and compatibility with 1μH inductors and 10–22μF ceramic output capacitors.
Technical Context
The MP2151GQFU-18-P uses constant-on-time (COT) control with input voltage feed-forward to maintain stable 1.1MHz switching across 2.5V–5.5V input and 1.8V output. Its internal 80mΩ P-channel high-side and 50mΩ N-channel low-side MOSFETs enable up to 1A continuous output with <100mV load regulation error at full load.
It integrates power-good (PG) monitoring with ±10%/+15% window detection, 150μs PG delay, and open-drain output requiring external pull-up. Output discharge activates automatically during shutdown via a 200Ω internal resistor, reducing VOUT to near-zero within milliseconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% over -40°C to +125°C - ensures stable core/I/O rail for 1.8V logic without external feedback resistors. |
| Max Output Current | 1A continuous - supports single-rail powering of microcontrollers, sensors, or RF transceivers in space-constrained designs. |
| Quiescent Current | 30–35μA (fixed version) - extends battery life in always-on IoT sensors and wearables operating at light loads. |
| Switching Frequency | 1.1MHz nominal - enables use of compact 1μH inductors and reduces EMI filtering requirements. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and dual-cell alkaline inputs. |
| Thermal Shutdown | 160°C with 30°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-off. |
| Power Good (PG) | Open-drain output with 150μs delay and 0.4V sink capability at 1mA - provides reliable system-level power sequencing and fault indication. |
Pinout & Package
MP2151GQFU-18-P is housed in a 6-pin UTQFN package (1.2mm × 1.6mm, 0.4mm pitch) with wettable flanks for automated optical inspection. Thermal pad on underside improves heat dissipation in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Primary return path for high-frequency switching current; must be connected to solid thermal pad and low-inductance ground plane. |
| 2 SW | Switch node | Drain of internal high-side P-MOSFET; connects directly to inductor; carries high di/dt square wave - requires short, wide trace routing. |
| 3 VIN | Input supply | Unregulated input (2.5–5.5V); decoupled with ≥10μF ceramic capacitor placed adjacent to pin to suppress input ripple and spikes. |
| 4 OUT | Output sense & power rail | Regulated 1.8V output; also serves as voltage sense point for internal feedback loop - connect load and output capacitor here. |
| 5 FB | Feedback input | Not used in fixed-output MP2151GQFU-18-P; left unconnected per datasheet - internal divider sets 1.8V output. |
| 6 EN | Enable control | Active-high logic input (1.2V threshold); floating or pulled low disables converter and triggers automatic output discharge. |
| - PG | Power good indicator | Open-drain output (pin 5 in fixed versions - note: UTQFN pinout places PG at pin 5, but MP2151GQFU-18-P uses pin 5 as FB; correction: per datasheet PACKAGE REFERENCE page 4, UTQFN fixed versions map PG to pin 5 and FB is omitted - thus MP2151GQFU-18-P pin 5 = PG, pin 6 = EN. Reconciled pinout below.) |
Corrected UTQFN pinout for MP2151GQFU-18-P (fixed 1.8V version): Pin 1 = GND, Pin 2 = SW, Pin 3 = VIN, Pin 4 = OUT, Pin 5 = PG, Pin 6 = EN.
Key Features
| Feature | Design Value |
|---|---|
| Integrated output discharge | 200Ω internal MOSFET discharges VOUT to <100mV within ~1ms after EN deactivation - eliminates need for external discharge circuitry in battery-backed systems. |
| Constant-on-time (COT) control | Delivers <10μs load transient response with no external compensation - simplifies design for dynamic loads like BLE radios or sensor bursts. |
| 100% duty cycle capability | Enables dropout operation down to VIN – VOUT ≈ 200mV - maintains regulation during brownout conditions common in Li-ion discharge profiles. |
| Short-circuit protection | Hiccup-mode recovery limits average power dissipation during sustained fault - prevents thermal runaway while allowing autonomous recovery when fault clears. |
| Output over-voltage protection (OVP) | Dynamic regulation activates at 115% VOUT (2.07V), clamping with low-side FET until VOUT falls to 105% (1.89V) - safeguards downstream 1.8V logic from catastrophic overvoltage. |
Applications
| Portable Medical Sensors | Industrial Handheld Scanners |
|---|---|
Use Scenario: Continuous glucose monitor with Bluetooth LE transmission powered by coin cell. IC Role / Device Role / Timing Role: Primary 1.8V system rail regulator delivering 300mA peak current during radio transmit bursts. Use Value: 25μA IQ extends battery life beyond 12 months; 1.1MHz switching allows miniature 1μH shielded inductor; PG signal confirms rail stability before initiating BLE connection. | Use Scenario: Rugged barcode scanner with OLED display and laser engine operating from 2xAA batteries. IC Role / Device Role / Timing Role: Supplies clean 1.8V to microcontroller and interface logic while rejecting noise from motor and laser drivers. Use Value: COT control rejects line disturbances from battery impedance rise; 100% duty cycle sustains operation down to 2.7V input; thermal shutdown prevents damage during extended scanning sessions. |
| Low-Power Wireless Gateways | Smart Energy Meters |
Use Scenario: Sub-GHz mesh gateway node using ARM Cortex-M0+ MCU and RF transceiver, powered by solar-charged LiFePO₄. IC Role / Device Role / Timing Role: Generates regulated 1.8V I/O supply for MCU GPIOs and RF IC interfaces with tight noise margin. Use Value: Integrated OVP protects sensitive RF front-end from input surge events; output discharge prevents backfeed into MCU during deep sleep wake-up transitions. | Use Scenario: DIN-rail mounted electricity meter with real-time clock, metrology ASIC, and PLC communication module. IC Role / Device Role / Timing Role: Provides isolated 1.8V auxiliary rail for metrology ADC reference and digital isolation barrier logic. Use Value: PG signal synchronizes firmware initialization with rail stabilization; 1.2mm × 1.6mm footprint saves PCB area in constrained meter housing; RoHS/halogen-free compliance meets utility procurement requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | 1.8V fixed, 300mA max, 2.05V–6.5V input, 22μA IQ, 3MHz switching | Limited to 300mA - insufficient for 1A loads; higher fSW demands smaller inductors but increases AC losses | Select only if load current ≤300mA and board space permits 0.8mm × 0.8mm DRY package; not suitable for 1A applications. |
| Analog Devices ADP2119ACPZ-R7 | 1.8V fixed, 1A, 2.3V–5.5V input, 35μA IQ, 1.2MHz switching, no output discharge | Lacks integrated discharge MOSFET - requires external circuit for VOUT bleed; different pinout (EN/PG swapped) | Choose when PG functionality is critical but discharge can be added externally; verify layout compatibility due to non-identical pin mapping. |
Compared with TPS62231DRYR and ADP2119ACPZ-R7, MP2151GQFU-18-P uniquely combines 1A capability, 25μA IQ, integrated output discharge, and PG in a 1.2mm × 1.6mm UTQFN - making it optimal for space- and battery-limited 1.8V systems where autonomous shutdown behavior is required.
Availability
MP2151GQFU-18-P is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld scanners, low-power wireless gateways, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for MP2151GQFU-18-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 power management ICs, founded in 1997 and headquartered in Kirkland, Washington.
The MP2151 product line targets ultra-compact, low-IQ DC/DC conversion for battery-powered edge devices - emphasizing minimal external components, thermal robustness, and seamless integration into space-constrained PCBs.
FAQ
What is the recommended input capacitor for MP2151GQFU-18-P?
A minimum 10μF X5R/X7R ceramic capacitor rated ≥6.3V must be placed as close as possible to the VIN and GND pins. For improved ripple suppression under dynamic load, add a parallel 1μF capacitor. Total effective capacitance should remain ≥10μF at DC bias to prevent input voltage sag during 1A load steps.
Does MP2151GQFU-18-P require an external feedback resistor network?
No. MP2151GQFU-18-P is a factory-trimmed fixed-output variant with internal resistor divider set to 1.8V. The FB pin is unused and must be left floating - connecting external resistors will disrupt regulation and may cause instability or overvoltage.
How does the power-good (PG) signal behave during startup and fault conditions?
PG asserts high (via external pull-up) only after VOUT reaches 90% of 1.8V and remains within ±10%/+15% window for ≥150μs. It pulls low if VOUT drops below 1.53V or exceeds 2.07V. During short-circuit, PG deasserts within microseconds, providing immediate fault signaling to host controllers.
Can MP2151GQFU-18-P operate with a 1.5V input supply?
No. The absolute minimum input voltage is 2.5V per datasheet specifications. At 1.5V, the device remains in under-voltage lockout (UVLO) with EN inactive and no switching. Attempting operation below 2.5V risks undefined behavior and failure to regulate.
What is the thermal performance of MP2151GQFU-18-P on a standard 2-layer PCB?
On a 63mm × 63mm 2-layer board (EV2151-QFU-00A reference), θJA is 65°C/W. At 1A output with 5V input, typical power dissipation is ~350mW, resulting in ~23°C junction-to-ambient rise - well within the 125°C max operating junction temperature limit.
Is the UTQFN package of MP2151GQFU-18-P compatible with reflow soldering per JEDEC J-STD-020?
Yes. The UTQFN package is qualified for standard lead-free reflow profiles (peak 260°C, 20–40s above 217°C). Its wettable flanks support automated optical inspection (AOI), and the thermal pad must be soldered to a dedicated copper pour connected to GND for optimal thermal and electrical performance.
MP2151GQFU-18-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UTQFN (1.2x1.6)
MP2151GQFU-18-P FAQ
1.How can I place an order for MP2151GQFU-18-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2151GQFU-18-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 MP2151GQFU-18-P reliable?
The price and inventory of MP2151GQFU-18-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2151GQFU-18-P is usually 5 days.
3.What payment methods are accepted for MP2151GQFU-18-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2151GQFU-18-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2151GQFU-18-P?
MP2151GQFU-18-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2151GQFU-18-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 MP2151GQFU-18-P?
For technical support, including MP2151GQFU-18-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2151GQFU-18-P requirements.
6.How does Aetrix verify that MP2151GQFU-18-P is sourced from the original manufacturer or authorized distributors?
All MP2151GQFU-18-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 MP2151GQFU-18-P meets industry standards.
7.What is the process for return or replacement of MP2151GQFU-18-P?
All MP2151GQFU-18-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2151GQFU-18-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 MP2151GQFU-18-P part is unused and in its original packaging.
Return procedure for MP2151GQFU-18-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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