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Monolithic Power Systems Inc. MP2151GQFU-P
- Part No.:
- MP2151GQFU-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 6-UFDFN
- Datasheet:
-
MP2151GQFU-P.pdf
- Description:
- IC REG BUCK ADJ 1A 6UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,508
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Product details
Overview
MP2151GQFU-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 80mΩ P-channel and 50mΩ N-channel MOSFETs, delivering up to 1A continuous output current from a 2.5V–5.5V input while maintaining 25μA quiescent current and supporting output discharge. It employs constant-on-time (COT) control for fast transient response and operates in ultra-small UTQFN (1.2mm × 1.6mm) package-ideal for space-constrained battery-powered devices requiring low-noise, high-efficiency power conversion.
For engineers reviewing the MP2151GQFU-P datasheet, MP2151GQFU-P pinout, MP2151GQFU-P application, or MP2151GQFU-P equivalent, this page delivers verified technical context, validated pin functions, confirmed efficiency vs. load curves at 1.2V/3.3V, real-world soft-start timing (0.5ms), and accurate EN/PG logic thresholds critical for portable system power sequencing and rail monitoring.
Technical Context
The MP2151GQFU-P uses constant-on-time (COT) control with input voltage feed-forward to maintain stable ~1.1MHz switching frequency across 2.5V–5.5V input and 0.6V–5.5V output ranges. Its internal dual-MOSFET architecture enables 100% duty-cycle operation and supports discontinuous conduction mode (DCM) via zero-current detection (ZCD) during light-load AAM operation.
It integrates cycle-by-cycle current limiting (1.8A typ), thermal shutdown (160°C), output over-voltage protection (115% VFB threshold), and automatic output discharge upon disable. The FB pin regulates output with ±1% accuracy (600mV reference), while EN provides precise power sequencing with 1.2V turn-on threshold and 150μs enable delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB, and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | 1A continuous - sufficient for powering ARM Cortex-M cores, RF transceivers, or sensor hubs from compact PCB footprints. |
| Quiescent Current | 25μA - enables >1-year battery life in always-on IoT sensors operating at microamp-level sleep currents. |
| Switching Frequency | 1.1MHz - allows use of small 1μH inductors and 10–22μF ceramic output capacitors, reducing solution size by >40% vs. 500kHz converters. |
| Feedback Accuracy | ±1% at 25°C (600mV reference) - ensures tight regulation for sensitive analog circuitry like ADC references or PLL VCO supplies. |
| Internal MOSFET RDS(on) | 80mΩ (HS) / 50mΩ (LS) - minimizes conduction loss at 1A, enabling >90% peak efficiency at 3.3VOUT/5VIN. |
| Soft-Start Time | 0.5ms - prevents inrush current and output overshoot during cold boot of FPGA I/O banks or memory subsystems. |
Pinout & Package
MP2151GQFU-P is housed in a 6-pin UTQFN package measuring 1.2mm × 1.6mm × 0.5mm, optimized for high-density portable PCB layouts. Thermal resistance θJA is 65°C/W on a 2-layer evaluation board, enabling 1A operation without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Primary return path for high-frequency switch node current; must be connected to solid ground plane beneath IC for EMI suppression. |
| 2 SW | Switching node | Drain of internal high-side P-MOSFET; connects directly to inductor; requires short, low-inductance trace to minimize ringing and voltage spikes. |
| 3 VIN | Input supply | Unregulated input (2.5–5.5V); requires ≥10μF X5R/X7R ceramic capacitor placed within 2mm of pin to suppress input ripple and transient spikes. |
| 4 OUT | Output sense and power rail | Regulated output voltage node; connects to load and output capacitor; used for feedback sensing in fixed-output variants (not present on MP2151GQFU-P). |
| 5 FB | Feedback input | Resistor-divider tap point; monitors output voltage against 600mV internal reference; determines final VOUT per R1/R2 ratio (e.g., 200kΩ/200kΩ = 1.2V). |
| 6 EN | Enable control | Active-high logic input (1.2V threshold); floating or pulled low disables converter and activates internal output discharge path (200Ω). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ sleep mode | 25μA quiescent current enables multi-year battery life in BLE/Wi-Fi edge nodes without compromising startup time. |
| Integrated output discharge | 200Ω internal discharge FET automatically bleeds output capacitance when disabled-eliminates need for external bleed resistor in safety-critical shutdown sequences. |
| Constant-on-time (COT) control | Delivers <10μs load transient recovery at 1A step change-critical for burst-mode processors and camera image sensors with dynamic power demands. |
| 100% duty-cycle capability | Supports dropout operation down to VOUT = VIN − 0.1V, enabling seamless transition from battery to USB power without brownout in portable medical devices. |
| Robust protection suite | Includes hiccup-mode SCP, thermal shutdown (160°C), Vo OVP (115% threshold), and absolute VIN OVP (6.1V)-reduces BOM count and improves field reliability. |
Applications
| Wearable Health Monitor | USB-C Powered Peripheral |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by coin-cell battery with Bluetooth LE transmission bursts. IC Role / Device Role / Timing Role: Primary 1.2V supply for analog front-end and 32-bit MCU; regulates during 100mA transmit peaks and 5μA sleep intervals. Use Value: 25μA IQ extends battery life beyond 18 months; COT control maintains <20mV output deviation during 50mA/ms load steps from radio activation. |
Use Scenario: Compact docking station converting 5V USB-C PD input to 3.3V/1.8V rails for HDMI bridge IC and USB hub controller. IC Role / Device Role / Timing Role: Secondary buck regulator stepping down 5V bus to 3.3V I/O supply; synchronized start-up with host enumeration sequence via EN pin. Use Value: 1.1MHz switching avoids AM radio band interference; 0.5ms soft-start prevents USB enumeration failure due to VBUS droop during hot-plug. |
| Industrial Sensor Node | Smart Home Motion Detector |
|
Use Scenario: Battery-operated vibration sensor node transmitting LoRaWAN packets every 5 minutes in factory environments. IC Role / Device Role / Timing Role: Main 3.3V supply for MEMS accelerometer, ultra-low-power MCU, and sub-GHz transceiver; enters deep-sleep between transmissions. Use Value: Output discharge ensures rapid rail collapse after shutdown-prevents false wake-ups from residual charge on decoupling caps near RF front-end. |
Use Scenario: PIR-based occupancy detector using CR2032 battery, requiring reliable 1.8V supply for digital signal processor and IR LED driver. IC Role / Device Role / Timing Role: Single-chip 1.8V regulator with EN controlled by PIR output; powers DSP only during motion detection window. Use Value: 80mΩ/50mΩ MOSFETs deliver >88% efficiency at 100mA load-maximizing usable battery capacity; 100% duty-cycle supports full CR2032 voltage range (3.0–2.0V). |
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 TPS62840YKAR | Lower IQ (300nA), but 0.6A max output; requires external compensation; no output discharge. | Better for nano-power sensor nodes (<100μA avg), unsuitable for 1A loads or systems needing automatic rail discharge. | Select if battery life >5 years is mandatory and peak load ≤600mA; avoid if output discharge or 1A capability is required. |
| Analog Devices LT8609S | Higher IQ (2.5μA), 2A output, spread-spectrum switching; larger 10-pin 3mm×3mm package. | Suited for noise-sensitive analog/RF systems where EMI reduction is critical; less space-constrained than wearables. | Choose for automotive or industrial applications needing lower EMI and higher current; not optimal for sub-2mm² footprint targets. |
Compared with TPS62840YKAR and LT8609S, MP2151GQFU-P uniquely balances ultra-small UTQFN size, true 1A capability, 25μA IQ, and integrated output discharge-making it the only fit for next-gen wearables and coin-cell IoT endpoints demanding all four attributes simultaneously.
Availability
MP2151GQFU-P is available at Aetrix Electronics and suitable for wearable health monitors, USB-C peripherals, industrial sensor nodes, and smart home motion detectors requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for MP2151GQFU-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2151 product line targets ultra-compact, battery-optimized DC/DC conversion for portable electronics-emphasizing minimal quiescent current, integrated protection, and sub-2mm² packaging without sacrificing 1A output capability.
FAQ
What is the minimum recommended output capacitor value for MP2151GQFU-P?
The datasheet specifies a minimum 10μF X5R/X7R ceramic capacitor at the output. Using 10–22μF ensures stable COT loop operation, limits output voltage ripple to <20mV under 1A load steps, and maintains phase margin above 45° across temperature and input voltage variations. Lower values risk instability or excessive overshoot during load transients.
Does MP2151GQFU-P support adjustable output voltage?
Yes-MP2151GQFU-P is the adjustable version of the MP2151 family. It uses an external resistor divider on the FB pin to set output voltage from 0.6V to 5.5V. Fixed-output variants (e.g., MP2151GQFU-12) omit the FB pin and integrate the divider internally; MP2151GQFU-P retains full adjustability and requires no external PG pin.
How does the output discharge function operate during shutdown?
When EN is pulled low or left floating, the MP2151GQFU-P activates an internal 200Ω NMOS discharge path between OUT and GND. This discharges output capacitance in ~5–10ms (depending on COUT), preventing latch-up in downstream logic or unsafe voltage holdover in medical/safety-critical systems-no external components required.
Can MP2151GQFU-P operate with a 1.5V input?
No-MP2151GQFU-P has a guaranteed operating input range of 2.5V to 5.5V, with UVLO rising threshold at 2.45V (typ). At 1.5V input, the device remains in under-voltage lockout and will not switch. For sub-2.5V inputs, consider MPS's MP2161 (1.8V–6V) or TI's TPS62840 (1.8V–5.5V) as alternatives.
Is thermal derating required for 1A continuous output in the UTQFN package?
Yes-on a standard 2-layer PCB (63mm × 63mm), the UTQFN package has θJA = 65°C/W. At 1A output with 5VIN/1.2VOUT, power dissipation is ~250mW, resulting in ~16°C junction rise above ambient. Derating begins above +109°C ambient to stay below 125°C max TJ; adding thermal vias under the exposed pad reduces θJA by ~20°C/W.
What is the purpose of the ZCD (zero-current detection) circuit?
ZCD monitors inductor current polarity and turns off the low-side MOSFET when current reaches −1.5A (typ), forcing discontinuous conduction mode (DCM) during light loads. This eliminates reverse inductor current, reduces switching losses, and enables the 25μA quiescent current specification-critical for extending battery life in intermittent-use devices.
Does MP2151GQFU-P include power-good (PG) signaling?
No-PG is only available on fixed-output variants (e.g., MP2151GQFU-12). MP2151GQFU-P lacks the PG pin and internal comparator; designers requiring rail monitoring must implement external supervision (e.g., TLV809) or use a fixed-output variant if PG functionality is mandatory for system reset sequencing.
MP2151GQFU-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- 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-P FAQ
1.How can I place an order for MP2151GQFU-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2151GQFU-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-P reliable?
The price and inventory of MP2151GQFU-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-P is usually 5 days.
3.What payment methods are accepted for MP2151GQFU-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2151GQFU-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2151GQFU-P?
MP2151GQFU-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2151GQFU-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-P?
For technical support, including MP2151GQFU-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2151GQFU-P requirements.
6.How does Aetrix verify that MP2151GQFU-P is sourced from the original manufacturer or authorized distributors?
All MP2151GQFU-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-P meets industry standards.
7.What is the process for return or replacement of MP2151GQFU-P?
All MP2151GQFU-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2151GQFU-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-P part is unused and in its original packaging.
Return procedure for MP2151GQFU-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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