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Monolithic Power Systems Inc. MP2151GQFU-33-Z
- Part No.:
- MP2151GQFU-33-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 6-UFDFN
- Datasheet:
-
MP2151GQFU-33-Z.pdf
- Description:
- IC REG BUCK 3.3V 1A 6UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,581
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Product details
Overview
MP2151GQFU-33-Z from Monolithic Power Systems is a fixed-output 3.3V, 1A synchronous step-down DC/DC converter in a 1.2mm × 1.6mm UTQFN package, featuring 25μA quiescent current, 1.1MHz switching frequency, and integrated 80mΩ/50mΩ MOSFETs - designed for battery-powered portable devices requiring ultra-low standby power and compact footprint.
For engineers reviewing the MP2151GQFU-33-Z datasheet, MP2151GQFU-33-Z pinout, MP2151GQFU-33-Z application, or MP2151GQFU-33-Z equivalent, key selection considerations include its fixed 3.3V output with ±1% FB accuracy, output discharge capability, 2.5V–5.5V input range, and PG (power good) indicator functionality specific to fixed-output variants.
Technical Context
The MP2151GQFU-33-Z employs constant-on-time (COT) control with input voltage feed-forward to maintain stable 1.1MHz switching across its 2.5V–5.5V input range while delivering up to 1A continuous output current. Its internal P-channel high-side (80mΩ) and N-channel low-side (50mΩ) MOSFETs eliminate external power switches.
It integrates output discharge via an internal MOSFET (200Ω), provides power-good indication with ±5% window (90%/105% rising/falling thresholds), and features hiccup-mode short-circuit protection, thermal shutdown at 160°C, and 110–120% output over-voltage protection triggered by feedback voltage monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (3251–3349mV over –40°C to +125°C), enabling direct replacement of LDOs in 3.3V rail applications without external feedback resistors. |
| Max Output Current | 1A continuous, supported by internal 80mΩ P-FET and 50mΩ N-FET, eliminating need for external power switches and reducing BOM count. |
| Quiescent Current | 30–35μA (typical at VIN=5V, no switching), enabling >1-year battery life in always-on IoT sensors powered by coin cells. |
| Switching Frequency | 1.1MHz nominal, allowing use of small 1μH inductors and <22μF ceramic output capacitors to minimize solution size. |
| Input Voltage Range | 2.5V to 5.5V, compatible with single-cell Li-ion (3.0–4.2V), LiFePO₄ (2.5–3.65V), and USB-powered systems. |
| Power Good (PG) | Open-drain output with 150μs delay, active when VOUT is within 90–105% of 3.3V - used for processor reset sequencing or system enable coordination. |
| Output Discharge | Internal 200Ω discharge path activated during EN=low, ensuring rapid VOUT decay (<1ms for 100μF load) to prevent back-powering or latch-up in multi-rail systems. |
Pinout & Package
MP2151GQFU-33-Z is housed in a 6-pin UTQFN package (1.2mm × 1.6mm, 0.4mm pitch, 0.55mm height) with wettable flanks for automated optical inspection (AOI). Thermal resistance θJA = 65°C/W on 2-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Primary return path for high-current switching loop; must be connected to solid thermal pad under package for thermal and EMI performance. |
| 2 SW | Switching node | Drain of internal high-side P-MOSFET; connects directly to inductor; requires minimal trace length and tight layout to reduce ringing and EMI. |
| 3 VIN | Input supply | Accepts 2.5–5.5V unregulated input; requires local 10μF ceramic capacitor placed ≤2mm from pin to suppress high-frequency input ripple. |
| 4 OUT | Output sense & power rail | Delivers regulated 3.3V; also serves as voltage sense point for internal OVP and PG logic - must connect directly to output capacitor positive terminal. |
| 5 FB | Feedback input | Not connected in fixed-output version (MP2151GQFU-33-Z); internally tied to reference; unused pin - leave floating or NC per datasheet. |
| 6 EN | Enable control | Active-high logic input (1.2V threshold); internal 1MΩ pulldown enables default-off behavior; controls startup timing and output discharge activation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ sleep mode | 30–35μA quiescent current enables >10-year shelf life in battery-backed real-time clocks and sensor nodes. |
| Integrated power MOSFETs | 80mΩ high-side + 50mΩ low-side switches eliminate external FETs and gate drivers, reducing solution area by ≥40% vs discrete buck designs. |
| Output discharge function | 200Ω internal discharge path ensures safe, controlled VOUT ramp-down during shutdown - critical for FPGA configuration integrity and I²C bus isolation. |
| Power Good (PG) indicator | Open-drain PG with ±5% window and 150μs delay provides reliable system-level power sequencing signal for microcontrollers and PMICs. |
| Hiccup-mode SCP & OVP | Short-circuit protection enters auto-retry hiccup mode; output OVP limits VOUT to ≤115% of 3.3V using feedback monitoring - prevents downstream IC damage. |
Applications
| Wireless Networking Cards | Portable Medical Sensors |
|---|---|
|
Use Scenario: Compact Wi-Fi 6/BLE module powered from single Li-ion cell with strict 10μA sleep budget. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator delivering 1A peak during RF transmission bursts while maintaining <35μA quiescent draw in idle state. Use Value: Enables 3.3V rail stability across full 2.8–4.2V battery range without external compensation, reducing bill-of-materials by two components versus adjustable buck + LDO cascade. |
Use Scenario: Wearable ECG patch requiring clinical-grade rail accuracy and zero residual voltage during power-off. IC Role / Device Role / Timing Role: Main 3.3V supply for analog front-end and BLE SoC, with PG signal triggering ADC calibration sequence upon power stabilization. Use Value: Fixed 3.3V output with ±1% tolerance and integrated output discharge eliminates need for external discharge FET and precision resistor divider - saving 1.2mm² PCB area. |
| Industrial Handheld Scanners | Low-Power IoT Gateways |
|
Use Scenario: Rugged barcode scanner operating from 3.6V primary battery with frequent deep-sleep cycles between scans. IC Role / Device Role / Timing Role: Core 3.3V supply for imaging sensor, laser driver, and MCU; EN pin synchronized to scan trigger for instantaneous wake-up. Use Value: 1.1MHz COT control delivers <10μs load transient recovery (0→1A), preventing image corruption during rapid laser activation pulses. |
Use Scenario: Battery-operated LoRaWAN gateway deployed in remote locations with 5-year maintenance interval. IC Role / Device Role / Timing Role: Always-on 3.3V rail for RTC, secure element, and sub-GHz transceiver; PG signal validates rail readiness before initiating network handshake. Use Value: 25–35μA IQ extends usable battery life beyond 5 years on 2000mAh Li-SOCl₂ cell, while PG output replaces external supervisor IC for BOM simplification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62865133RTER | 3.3V fixed, 1.2A, 1.8MHz, 17μA IQ, but requires external soft-start capacitor and lacks output discharge. | No integrated discharge path - unsuitable where rapid VOUT decay is required for system safety or data retention. | Select if higher switching frequency and lower IQ are prioritized over discharge functionality and board space. |
| Analog Devices ADP5302AUJZ-3.3-R7 | 3.3V fixed, 1A, 2.5MHz, 250nA IQ, but uses external MOSFETs and has no PG output or OVP. | Lacks power-good signaling and output over-voltage protection - necessitates additional supervision circuitry for safety-critical rails. | Choose only for ultra-low-IQ applications where external FETs and added protection ICs are acceptable trade-offs. |
Compared with TPS62865133RTER and ADP5302AUJZ-3.3-R7, MP2151GQFU-33-Z uniquely combines fixed 3.3V regulation, integrated output discharge, PG indicator, and 35μA IQ in a 1.2×1.6mm package - making it optimal for space-constrained, battery-powered systems requiring full autonomous protection and sequencing.
Availability
MP2151GQFU-33-Z is available at Aetrix Electronics and suitable for wireless networking cards, portable medical sensors, industrial handheld scanners, and low-power IoT gateways requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP2151GQFU-33-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2151 product line targets ultra-compact, low-quiescent-current DC/DC conversion for battery-powered edge devices - emphasizing integration (MOSFETs, PG, discharge), efficiency at light loads, and minimal external component count.
FAQ
What is the purpose of the FB pin on MP2151GQFU-33-Z?
The FB pin is not used in the fixed-output MP2151GQFU-33-Z variant. It is internally connected to the 0.6V reference and left unconnected on the die. Per the datasheet, this pin should remain floating - no external components or routing are required, and connecting it may cause malfunction or reduced reliability.
Does MP2151GQFU-33-Z support forced PWM mode?
No. MP2151GQFU-33-Z operates exclusively in constant-on-time (COT) control with automatic transition between continuous conduction mode (CCM), discontinuous conduction mode (DCM), and sleep mode based on load. There is no pin or register to force fixed-frequency PWM operation.
How does the output discharge function behave during EN deactivation?
When EN is pulled low, the internal 200Ω discharge MOSFET activates immediately, sinking current from the output capacitor. For a typical 100μF output cap charged to 3.3V, VOUT decays to <100mV in <1.2ms - preventing back-powering of upstream sources or unintended logic states in powered-down subsystems.
Can MP2151GQFU-33-Z operate with input voltage below 2.5V?
No. The absolute minimum input voltage is 2.5V per datasheet specifications. Below this, the device enters undervoltage lockout (UVLO) and ceases switching. The UVLO rising threshold is 2.45V typical with 200mV hysteresis, so operation below 2.25V is not guaranteed or characterized.
Is the PG pin compatible with 1.8V logic systems?
Yes. The PG pin is open-drain and requires an external pull-up resistor. When pulled to 1.8V, it asserts logic-high at ≥1.62V (90% of 1.8V) and releases at ≤1.53V (85% of 1.8V), meeting standard 1.8V CMOS input thresholds. Use a 100–500kΩ pull-up to ensure proper rise time and noise immunity.
What is the maximum recommended PCB copper area for the thermal pad?
The UTQFN package's exposed thermal pad (EPAD) should be soldered to a minimum 25mm² copper pour on the top layer, connected via ≥4 thermal vias (0.3mm diameter) to an internal or bottom-layer ground plane. Larger copper areas improve thermal performance but do not exceed 50mm² unless validated for solder voiding in reflow profiles.
Does MP2151GQFU-33-Z require input or output capacitance derating for temperature?
Yes. Ceramic output capacitors must be X5R/X7R grade with ≥20% voltage derating at +85°C. For example, a 6.3V-rated 22μF capacitor retains only ~14μF at 3.3V bias and +85°C. Input capacitance should similarly use 10V-rated 10μF X5R parts to maintain ≥8μF effective capacitance across temperature and bias.
MP2151GQFU-33-Z 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-Z FAQ
1.How can I place an order for MP2151GQFU-33-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2151GQFU-33-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 MP2151GQFU-33-Z reliable?
The price and inventory of MP2151GQFU-33-Z 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-Z is usually 5 days.
3.What payment methods are accepted for MP2151GQFU-33-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2151GQFU-33-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2151GQFU-33-Z?
MP2151GQFU-33-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2151GQFU-33-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 MP2151GQFU-33-Z?
For technical support, including MP2151GQFU-33-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2151GQFU-33-Z requirements.
6.How does Aetrix verify that MP2151GQFU-33-Z is sourced from the original manufacturer or authorized distributors?
All MP2151GQFU-33-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 MP2151GQFU-33-Z meets industry standards.
7.What is the process for return or replacement of MP2151GQFU-33-Z?
All MP2151GQFU-33-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2151GQFU-33-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 MP2151GQFU-33-Z part is unused and in its original packaging.
Return procedure for MP2151GQFU-33-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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