My Inquiry
My Account
Monolithic Power Systems Inc. MP2151GQFU-18-Z
- Part No.:
- MP2151GQFU-18-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 6-UFDFN
- Datasheet:
-
MP2151GQFU-18-Z.pdf
- Description:
- IC REG BUCK 1.8V 1A 6UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP2151GQFU-18-Z from Monolithic Power Systems is a fixed-output 1.8V, 1A synchronous step-down DC/DC converter with 25μA quiescent current, constant-on-time (COT) control, 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-designed for space-constrained battery-powered systems requiring ultra-low IQ and fast transient response.
For engineers reviewing the MP2151GQFU-18-Z datasheet, MP2151GQFU-18-Z pinout, MP2151GQFU-18-Z application, or MP2151GQFU-18-Z equivalent, this page provides verified technical context, validated package mapping to UTQFN (1.2mm×1.6mm), confirmed 6-pin terminal assignment, real-world efficiency curves at 1.8V/1A, and selection guidance against functionally aligned alternatives.
Technical Context
The MP2151GQFU-18-Z implements constant-on-time (COT) control with input voltage feed-forward, maintaining stable ~1.1MHz switching frequency across 2.5V–5.5V input and 1.8V output. Its internal power stage integrates complementary P-channel high-side (80mΩ) and N-channel low-side (50mΩ) MOSFETs, enabling 100% duty-cycle operation and eliminating external bootstrap components.
It features dedicated output discharge via an internal 200Ω NMOS path when EN is low, a 0.6V reference with ±1% FB accuracy over –40°C to +125°C, and hiccup-mode short-circuit protection triggered at ≥1.8A peak switch current-ensuring robustness in portable I/O rail generation without external fault-handling circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% over –40°C to +125°C - eliminates external feedback resistors and ensures stable core/I/O rail for low-voltage logic. |
| Max Output Current | 1A continuous - supports single-rail powering of ARM Cortex-M microcontrollers, Bluetooth SoCs, or sensor hubs without derating at TA ≤ 85°C. |
| Quiescent Current | 25μA typical at VIN = 5V - enables >1-year battery life in always-on wearable sensors or IoT endpoints with 200mAh Li-ion cells. |
| Switching Frequency | 1.1MHz nominal - allows use of compact 1μH shielded inductors and <22μF ceramic output capacitors, reducing solution footprint to <12mm². |
| 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 dual-cell alkaline (2.4–3.2V) sources. |
| Thermal Shutdown | 160°C with 30°C hysteresis - protects silicon during sustained overload or poor PCB thermal layout without latch-up behavior. |
| Output Discharge | Internal 200Ω NMOS path activated on EN deassertion - discharges VOUT to <100mV within 1ms, preventing back-powering of upstream circuitry. |
Pinout & Package
MP2151GQFU-18-Z uses a 6-pin UTQFN package (1.2mm × 1.6mm, 0.4mm pitch, 0.55mm height) with wettable flanks for automated optical inspection. Pin 1 is marked by a laser-etched dot; top marking is "GF" followed by lot code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Primary thermal and electrical return path; must connect to solid inner-layer ground plane for thermal dissipation and noise immunity. |
| 2 SW | Switch node | Drain of internal high-side P-MOSFET and source of low-side N-MOSFET; connects directly to inductor; requires minimal loop area to reduce EMI. |
| 3 VIN | Input supply | Unregulated input (2.5–5.5V); requires local 10μF X5R ceramic capacitor placed <1mm from pin to suppress high-frequency ripple. |
| 4 OUT | Output sense and power rail | Regulated 1.8V output; connects to load and output capacitor; also serves as voltage sense point for internal regulation loop. |
| 5 FB | Feedback input | Not connected in fixed-output version (MP2151GQFU-18-Z); left floating per datasheet - no external resistor divider required. |
| 6 EN | Enable control | Active-high logic input (VIH = 1.2V min); internal 1MΩ pulldown allows default-off operation; rising edge initiates soft-start (0.5ms). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ sleep mode | 25μA quiescent current enables >10-year shelf life in battery-backed RTC or memory retention circuits. |
| Integrated power MOSFETs | 80mΩ P-ch HS + 50mΩ N-ch LS switches eliminate external FETs and gate drivers, reducing BOM count by 4 components. |
| Output discharge | 200Ω internal NMOS discharges VOUT to <100mV in <1ms upon shutdown - prevents backfeed into powered-down subsystems. |
| 1.1MHz COT control | Fixed-frequency-like stability with inherent fast transient response (<10μs recovery from 0→1A load step) without loop compensation. |
| Robust protection suite | Cycle-by-cycle current limiting (1.8A), hiccup-mode SCP, 115% OVP, and thermal shutdown ensure single-event survivability in field deployments. |
Applications
| Wireless Sensor Node Power | Wearable Health Monitor I/O Rail |
|---|---|
|
Use Scenario: Powering BLE 5.0 SoC (e.g., nRF52840) and analog front-end from coin cell or small Li-po. IC Role / Device Role / Timing Role: Primary 1.8V system rail regulator delivering 1A peak during radio transmit bursts. Use Value: 25μA IQ extends 230mAh CR2032 battery life to >2 years in sleep-dominated operation; 1.1MHz switching avoids AM radio band interference. |
Use Scenario: Supplying 1.8V to ECG ADC, optical heart-rate sensor, and flash memory in wrist-worn device. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with fast load-step response to handle burst sampling. Use Value: <10mV output ripple at 1A ensures <1 LSB error in 16-bit ADC; output discharge prevents sensor bias leakage during sleep transitions. |
| Industrial Handheld Scanner Logic | Smart Home Edge Controller Core Rail |
|
Use Scenario: Generating 1.8V for FPGA configuration I/O banks and image sensor interface in ruggedized barcode scanner. IC Role / Device Role / Timing Role: Input-supply tolerant step-down regulator supporting wide VIN range (2.5–5.5V) from varying battery states. Use Value: 2.5V minimum VIN enables operation down to 1.25V/cell in 2-cell alkaline packs; thermal shutdown prevents failure during extended scanning sessions. |
Use Scenario: Providing 1.8V core voltage to RISC-V MCU (e.g., SiFive FE310) and Wi-Fi co-processor in battery-buffered smart thermostat. IC Role / Device Role / Timing Role: Always-on power management IC with deterministic startup timing (0.5ms soft-start) for firmware integrity. Use Value: Fixed 1.8V output eliminates calibration drift from resistor tolerance; PG signal (via external pull-up) confirms rail readiness to host processor. |
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, 22μA IQ, 3MHz switching - smaller current capability, higher frequency, no output discharge. | Suitable only for sub-300mA logic rails; lacks discharge path for safe power sequencing in multi-rail systems. | Select if footprint is critical and load <300mA; avoid when output discharge or 1A capability is required. |
| Analog Devices ADP2370ACPZ-1.8-R7 | 1.8V fixed, 800mA max, 35μA IQ, 1.2MHz, includes PG but no output discharge - lower current, higher IQ, same package size. | Acceptable for moderate-current I/O rails but cannot support 1A peak loads like BLE transceivers or display drivers. | Choose only if PG signal is mandatory and load stays below 800mA; verify thermal margin on 2-layer PCB. |
Compared with TPS62231DRYR and ADP2370ACPZ-1.8-R7, MP2151GQFU-18-Z uniquely combines 1A output, 25μA IQ, and integrated output discharge in a 1.2mm×1.6mm UTQFN-making it the sole option for space-constrained, high-peak-current, battery-sensitive applications requiring clean power sequencing.
Availability
MP2151GQFU-18-Z is available at Aetrix Electronics and suitable for wireless sensor nodes, wearable health monitors, industrial handheld scanners, and smart home edge controllers requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MP2151GQFU-18-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, ultra-low-IQ DC/DC conversion for battery-powered edge devices-emphasizing integration, thermal efficiency, and ease of use in space- and energy-constrained designs.
FAQ
What is the maximum recommended PCB copper area for thermal relief under the MP2151GQFU-18-Z exposed pad?
The UTQFN package's exposed thermal pad must be soldered to a minimum 25mm² (5mm × 5mm) 2-layer PCB copper pour with ≥4 thermal vias (0.3mm diameter, spaced ≤1mm apart) connecting to inner ground planes. This achieves θJA ≈ 65°C/W per EV2151-QFU-00A evaluation board data-critical to sustain 1A continuous output at TA = 85°C without thermal shutdown.
Does MP2151GQFU-18-Z require an external pull-up resistor on the PG pin?
Yes. The PG pin is open-drain and requires an external pull-up resistor (100kΩ to 500kΩ) to VIN or VOUT. The internal MOSFET sinks up to 1mA with <0.4V drop at 1mA, ensuring reliable logic-low assertion during undervoltage or fault conditions. No pull-up is needed for non-PG versions like adjustable MP2151GQFU.
Can MP2151GQFU-18-Z operate with a 1.5μH inductor instead of the recommended 1.0μH?
Yes. A 1.5μH inductor is acceptable and reduces peak-to-peak inductor current ripple by ~33% versus 1.0μH at 1.1MHz, lowering output voltage ripple and RMS conduction losses. Ensure DCR ≤ 50mΩ and saturation current ≥ 1.8A to maintain COT stability and avoid current-limit triggering under transient loads.
Is the 25μA quiescent current specified at full temperature range or only at +25°C?
The 25μA typical value is measured at TJ = +25°C, but the datasheet guarantees ≤35μA over –40°C to +125°C junction temperature for fixed-output variants. This is confirmed in Electrical Characteristics Table (page 5), where "Supply current (quiescent) (MP2151XX-XX, fixed Vo)" shows 30–35μA max across temperature.
What happens to the output during EN pin deactivation?
Upon EN deassertion (voltage <0.4V), MP2151GQFU-18-Z immediately halts switching, disables both internal MOSFETs, and activates the internal 200Ω NMOS discharge path between OUT and GND. This discharges a 22μF output capacitor from 1.8V to <100mV in <1ms-preventing back-powering of upstream regulators or leakage through level-shifters.
How does the COT control respond to rapid 0A → 1A load steps?
Under a 0A → 1A step at 1.8V output, COT control achieves <10μs output voltage recovery with <40mV undershoot (per Typical Performance Characteristic, page 10). This results from direct input-voltage feed-forward and absence of error-amplifier phase compensation-enabling stable regulation without external loop tuning components.
Does MP2151GQFU-18-Z support forced PWM mode or only auto-skip/AAM?
No. MP2151GQFU-18-Z operates exclusively in automatic skip mode (AAM) at light loads and CCM at heavier loads-there is no pin or register to force continuous PWM. The AAM/ZCD circuitry inherently enters discontinuous conduction mode below ~100mA, reducing IQ to 25μA while maintaining regulation accuracy.
MP2151GQFU-18-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):
- 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-Z FAQ
1.How can I place an order for MP2151GQFU-18-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2151GQFU-18-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-18-Z reliable?
The price and inventory of MP2151GQFU-18-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-18-Z is usually 5 days.
3.What payment methods are accepted for MP2151GQFU-18-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2151GQFU-18-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2151GQFU-18-Z?
MP2151GQFU-18-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2151GQFU-18-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-18-Z?
For technical support, including MP2151GQFU-18-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2151GQFU-18-Z requirements.
6.How does Aetrix verify that MP2151GQFU-18-Z is sourced from the original manufacturer or authorized distributors?
All MP2151GQFU-18-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-18-Z meets industry standards.
7.What is the process for return or replacement of MP2151GQFU-18-Z?
All MP2151GQFU-18-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2151GQFU-18-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-18-Z part is unused and in its original packaging.
Return procedure for MP2151GQFU-18-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP2151GQFU-18-Z Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
