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Monolithic Power Systems Inc. MP2151GQFU-33-P
- Part No.:
- MP2151GQFU-33-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 6-UFDFN
- Datasheet:
-
MP2151GQFU-33-P.pdf
- Description:
- IC REG BUCK 3.3V 1A 6UTQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MP2151GQFU-33-P from Monolithic Power Systems is a fixed-output 3.3V, 1A synchronous step-down DC/DC converter with 25μA quiescent current, 1.1MHz switching frequency, and integrated 80mΩ/50mΩ MOSFETs. It operates from 2.5V–5.5V input, delivers ±1% output accuracy over temperature, and includes output discharge, OVP, SCP, and thermal shutdown - deployed in battery-powered portable instruments and low-voltage I/O power rails.
For engineers reviewing the MP2151GQFU-33-P datasheet, MP2151GQFU-33-P pinout, MP2151GQFU-33-P application, or MP2151GQFU-33-P equivalent, key selection considerations include its UTQFN (1.2mm×1.6mm) package footprint, PG open-drain indicator timing thresholds (90%/85% UV, 115%/105% OV), 0.5ms soft-start duration, and COT control architecture enabling fast transient response without external compensation.
Technical Context
The MP2151GQFU-33-P implements constant-on-time (COT) control with input voltage feed-forward to maintain stable 1.1MHz switching across 2.5V–5.5V input and 3.3V output, eliminating need for loop compensation. Its internal high-side P-channel and low-side N-channel MOSFETs (80mΩ/50mΩ) enable synchronous rectification and 100% duty-cycle operation for ultra-low dropout.
It integrates power-good (PG) monitoring with ±10% rising/falling thresholds relative to 3.3V nominal, plus output discharge via internal 200Ω resistor when EN is low. Protection includes cycle-by-cycle current limiting (1.8A typ), hiccup-mode short-circuit recovery, and thermal shutdown at 160°C with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over -40°C to +125°C - ensures stable rail for MCU I/O or RF front-end biasing without external feedback resistors. |
| Max Output Current | 1A continuous - supports single-core microcontrollers, Bluetooth SoCs, or sensor hubs without thermal derating on 2-layer PCBs. |
| Quiescent Current | 30–35μA (typ) - enables >1-year battery life in always-on wearable sensors powered by coin cells. |
| Switching Frequency | 1.1MHz - allows use of compact 1μH shielded inductors and reduces EMI filtering burden in space-constrained layouts. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), USB VBUS (4.75–5.25V), and 3.3V LDO pre-regulated supplies. |
| Package | UTQFN-6 (1.2mm × 1.6mm, 0.4mm pitch) - provides 35% smaller footprint than SOT563 while improving thermal resistance (θJA = 65°C/W). |
| Power Good (PG) | Open-drain output with 150μs delay, 0.4V sink @ 1mA - enables precise system power sequencing and brown-out detection in multi-rail designs. |
Pinout & Package
MP2151GQFU-33-P uses a 6-pin UTQFN package (1.2mm × 1.6mm, 0.4mm pitch) with wettable flanks for automated optical inspection. Thermal pad is internally connected to GND for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Primary return path for high-frequency switching currents; must be connected to large copper pour under thermal pad. |
| 2 SW | Switch node | Drain of internal high-side P-MOSFET; connects directly to inductor; requires minimal trace length to reduce EMI and ringing. |
| 3 VIN | Input supply | Accepts 2.5–5.5V unregulated input; requires local 10μF ceramic capacitor placed within 2mm of pin. |
| 4 OUT | Output sense and power rail | Provides regulated 3.3V output; also serves as voltage sense point for internal regulation loop and PG monitoring. |
| 5 FB | Feedback input | Not used in fixed-output MP2151GQFU-33-P; internally tied to reference; leave floating or connect to GND per layout guidelines. |
| 6 EN | Enable control | Active-high logic input (1.2V threshold); pulls down internally via 1MΩ resistor; initiates soft-start and output discharge when low. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ sleep mode | 30–35μA quiescent current enables >10-year shelf life in IoT edge nodes with intermittent wake-up cycles. |
| Integrated output discharge | 200Ω internal discharge path clears 3.3V rail within 10ms after EN deactivation - prevents back-powering of upstream circuitry. |
| Fixed 3.3V output with PG | ±1% accuracy and open-drain PG signal simplify power sequencing in FPGA/CPU core logic requiring strict rail validation. |
| COT control with no compensation | Eliminates external RC network; achieves <10μs load transient recovery time for burst-mode wireless transceivers. |
| Robust protection suite | Hiccup-mode SCP, 115% OVP clamping, and 160°C thermal shutdown ensure reliable operation in unattended industrial sensors. |
Applications
| Wireless Networking Cards | Portable Instruments |
|---|---|
|
Use Scenario: Compact Wi-Fi 6/BLE module powering baseband processor and RF transceiver from single Li-ion cell. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator with PG confirmation before radio initialization sequence begins. Use Value: 1.1MHz switching avoids interference with 2.4GHz ISM band; 25μA IQ extends battery runtime between firmware updates. |
Use Scenario: Handheld multimeter with LCD, ADC, and Bluetooth LE interface operating from two AAA batteries. IC Role / Device Role / Timing Role: Main 3.3V supply for microcontroller and analog front-end, synchronized to EN-driven measurement trigger. Use Value: Output discharge prevents ghost voltage on analog inputs during power-down; 100% duty cycle maintains regulation down to 2.5V input. |
| Battery-Powered Devices | Low-Voltage I/O System Power |
|
Use Scenario: Asset tracker using GPS + cellular modem, cycling between deep-sleep (10μA) and active transmission bursts. IC Role / Device Role / Timing Role: Always-on 3.3V rail generator that remains enabled during sleep to power real-time clock and wake-up logic. Use Value: 35μA IQ minimizes self-discharge; soft-start prevents inrush current from triggering battery protection ICs. |
Use Scenario: Industrial PLC I/O module requiring isolated 3.3V logic rail for digital input conditioning and status LEDs. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 5V field bus, monitored by PG for fault logging. Use Value: PG signal asserts within 150μs of valid output, enabling deterministic watchdog reset coordination across distributed nodes. |
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 TPS62840DLCR | 2.7–6.5V input, 3.3V fixed, 1.8A, 1.8μA IQ, 2.25MHz - higher efficiency above 500mA but larger QFN-8 package (1.5mm×2.0mm). | Preferred for high-density wearables needing >1.5A peak current and sub-2μA shutdown IQ. | Select if board space allows larger package and system demands <2μA shutdown current with faster transient response. |
| Analog Devices ADP5302ACPZ-3.3-R7 | 1.8–5.5V input, 3.3V fixed, 1A, 250nA IQ, 2MHz - ultra-low IQ but lacks PG and output discharge; requires external soft-start capacitor. | Suitable for medical patch monitors where nanowatt standby dominates lifetime calculation. | Choose only when PG signaling is unnecessary and board-level soft-start timing can be externally controlled. |
Compared with TPS62840DLCR and ADP5302ACPZ-3.3-R7, MP2151GQFU-33-P uniquely balances ultra-small UTQFN size, integrated PG+discharge, and 30μA IQ - making it optimal for cost-sensitive portable instruments where reliability and layout simplicity outweigh extreme IQ minimization.
Availability
MP2151GQFU-33-P is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered telemetry, and low-voltage I/O system power requiring stable component supply, full lifecycle support, and RoHS-compliant sourcing.
Supply support for MP2151GQFU-33-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, low-IQ DC/DC conversion for space- and energy-constrained portable electronics - emphasizing integration (MOSFETs, PG, discharge), small-footprint packaging (UTQFN/SOT563), and COT control for rapid deployment without loop tuning.
FAQ
What is the exact output voltage tolerance of MP2151GQFU-33-P over temperature?
The MP2151GQFU-33-P delivers 3.3V output with ±1% accuracy across –40°C to +125°C junction temperature, verified by characterization data showing min/max of 3.251V and 3.349V at extremes. This is achieved via laser-trimmed internal reference and matched feedback divider.
Does MP2151GQFU-33-P require external feedback resistors?
No. MP2151GQFU-33-P is a factory-programmed fixed-output variant; the FB pin is internally connected to the 0.6V reference and must be left floating or tied to GND per MPS layout recommendations. External resistors are only required for adjustable versions like MP2151GQFU.
How does the power-good (PG) signal behave during startup and fault conditions?
PG asserts high (via external pull-up) 150μs after VOUT reaches 90% of 3.3V and remains high until VOUT drops below 85% (UV) or rises above 115% (OV). During short-circuit or OVP events, PG pulls low within 150μs to signal fault condition to host controller.
Can MP2151GQFU-33-P operate with input voltage below 2.5V?
No. The device incorporates an under-voltage lockout (UVLO) with 2.45V rising threshold and 200mV hysteresis. Operation ceases below ~2.25V input, and the part enters shutdown with 0.5–1μA current draw. It will not regulate or switch below 2.5V nominal input.
What is the recommended inductor value and DCR limit for MP2151GQFU-33-P?
MPS recommends a 1.0–2.2μH shielded power inductor with DC resistance ≤50mΩ. For 3.3V/1A operation from 5V input, a 1.0μH inductor (e.g., Coilcraft XAL5030-102MEB) yields optimal efficiency (>88%) and transient response while minimizing board area.
Is output discharge active during EN-controlled shutdown only, or also during VIN dropout?
Output discharge is activated exclusively when EN is pulled low (or left floating, due to internal 1MΩ pull-down). It is not triggered during VIN undervoltage or thermal shutdown - those conditions disable switching but retain output capacitance charge until external load discharges it.
What thermal performance can be expected on a standard 2-layer PCB?
On a 63mm×63mm 2-layer PCB (EV2151-QFU-00A reference), MP2151GQFU-33-P exhibits θJA = 65°C/W. At 1A load and 5V input, junction temperature rise is ~65°C above ambient - staying well below 125°C max rating with no heatsink required.
MP2151GQFU-33-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):
- 3.3V
- 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-33-P FAQ
1.How can I place an order for MP2151GQFU-33-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2151GQFU-33-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-33-P reliable?
The price and inventory of MP2151GQFU-33-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-33-P is usually 5 days.
3.What payment methods are accepted for MP2151GQFU-33-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2151GQFU-33-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2151GQFU-33-P?
MP2151GQFU-33-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2151GQFU-33-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-33-P?
For technical support, including MP2151GQFU-33-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2151GQFU-33-P requirements.
6.How does Aetrix verify that MP2151GQFU-33-P is sourced from the original manufacturer or authorized distributors?
All MP2151GQFU-33-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-33-P meets industry standards.
7.What is the process for return or replacement of MP2151GQFU-33-P?
All MP2151GQFU-33-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2151GQFU-33-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-33-P part is unused and in its original packaging.
Return procedure for MP2151GQFU-33-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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