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Monolithic Power Systems Inc. MP2151GTF-25-Z
- Part No.:
- MP2151GTF-25-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-563, SOT-666
- Datasheet:
-
MP2151GTF-25-Z.pdf
- Description:
- IC REG BUCK 2.5V 1A SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
MP2151GTF-25-Z from Monolithic Power Systems is a fixed-output 2.5V, 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 ±1.5% output accuracy over temperature, and includes output discharge, OVP, SCP, and thermal shutdown-designed for battery-powered portable electronics requiring ultra-low IQ and compact power delivery.
For engineers reviewing the MP2151GTF-25-Z datasheet, MP2151GTF-25-Z pinout, MP2151GTF-25-Z application, or MP2151GTF-25-Z equivalent, key selection criteria include its fixed 2.5V output, SOT563 package footprint, EN-controlled sequencing, PG indicator functionality, and suitability for space-constrained, low-IQ systems such as wireless sensors and handheld instrumentation.
Technical Context
The MP2151GTF-25-Z implements constant-on-time (COT) control with input voltage feed-forward to maintain stable 1.1MHz switching across 2.5V–5.5V input and 2.5V output, enabling fast transient response without external compensation. Its internal power stage integrates complementary P-channel high-side (80mΩ) and N-channel low-side (50mΩ) MOSFETs optimized for efficiency at light and full load.
It features dedicated power-good (PG) monitoring with ±5% window detection (90%/105% thresholds), open-drain output requiring external pull-up, and automatic output discharge during disable via internal 200Ω resistor. Sleep-mode operation reduces IQ to 25μA while maintaining regulation through valley-FB control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% over -40°C to +125°C - ensures stable I/O rail for low-voltage logic and analog circuitry without external feedback resistors. |
| Max Output Current | 1A continuous - supports single-rail powering of microcontrollers, RF transceivers, or sensor interfaces in portable devices. |
| Quiescent Current | 25μA typical at VIN=5V - enables multi-year battery life in always-on IoT endpoints and wearables. |
| Switching Frequency | 1.1MHz nominal - allows use of small 1μH inductors and <22μF ceramic output capacitors, minimizing 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. |
| Protection Features | Cycle-by-cycle current limit (1.8A), hiccup-mode short-circuit protection, thermal shutdown (160°C), output OVP (115% VOUT), and input OVP (6.1V) - ensures robust field reliability without external supervision. |
| Package | SOT563 (1.6mm × 1.6mm × 0.55mm) - ultra-small footprint suitable for dense PCB layouts in compact consumer and medical devices. |
Pinout & Package
SOT563 package: 6-pin, 1.6mm × 1.6mm × 0.55mm body, 0.5mm pitch, exposed pad for thermal enhancement. Pin 1 marked by dot; pins numbered counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Primary return path for high-current switching loop; must be connected to low-impedance ground plane under IC for EMI and thermal performance. |
| 2 SW | Switch node | Drain of internal high-side P-MOSFET; connects directly to inductor; carries high di/dt; requires tight layout to minimize ringing and EMI. |
| 3 VIN | Input supply | Unregulated 2.5–5.5V input; requires local 10μF ceramic capacitor placed within 2mm of pin to suppress input voltage spikes. |
| 4 EN | Enable control | Active-high logic input (1.2V threshold); internal 1MΩ pulldown allows floating-disable; controls startup sequencing and system-level power management. |
| 5 PG | Power good indicator | Open-drain output signaling valid 2.5V rail (90–105% window); requires external 100–500kΩ pull-up to VIN or VOUT for host processor monitoring. |
| 6 OUT | Output sense & power rail | Regulated 2.5V output; also serves as voltage sense point for internal feedback; connects to load and output capacitor; routed with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 25μA enables >10-year battery life in coin-cell-powered sensors and remote monitors operating at μA average load. |
| Integrated power MOSFETs | 80mΩ P-ch HS + 50mΩ N-ch LS eliminates external FETs and gate drivers, reducing BOM count and board area by >30% vs discrete solutions. |
| Output discharge on disable | Internal 200Ω discharge path rapidly collapses VOUT upon EN deactivation, preventing back-powering and ensuring clean system reset. |
| Constant-on-time (COT) control | Eliminates loop compensation components and provides sub-10μs load transient recovery - critical for burst-mode MCU and RF applications. |
| Fixed-output PG indicator | Dedicated open-drain PG pin with ±5% accuracy enables reliable power sequencing verification in multi-rail embedded systems without firmware polling. |
Applications
| Wireless Sensor Nodes | Portable Medical Devices |
|---|---|
|
Use Scenario: Battery-powered BLE/Wi-Fi temperature/humidity sensor with sleep duty cycle <0.1%. IC Role / Device Role / Timing Role: Primary 2.5V system rail regulator delivering regulated power to MCU, radio, and analog front-end during active bursts. Use Value: 25μA IQ extends CR2032 battery life beyond 5 years; 1.1MHz switching enables 1.0×1.0mm inductor footprint; PG signal validates rail before radio transmission. |
Use Scenario: Handheld pulse oximeter using AAA alkaline cells with dynamic load ranging from 50μA (idle) to 800mA (LED drive). IC Role / Device Role / Timing Role: Main 2.5V supply for analog signal chain (ADC, op-amps) and digital controller, supporting rapid LED pulsing without rail droop. Use Value: COT control achieves <20mV undershoot during 100mA→800mA step; output discharge prevents sensor memory corruption during battery swap. |
| Industrial Handheld Scanners | Low-Power IoT Gateways |
|
Use Scenario: Rugged barcode scanner powered by 3.7V Li-ion, requiring clean 2.5V for CMOS image sensor and FPGA configuration. IC Role / Device Role / Timing Role: Fixed-output buck supplying noise-sensitive imaging circuitry; EN synchronized to scan trigger for zero-power standby. Use Value: ±1.5% output accuracy ensures consistent ADC reference; SOT563 package fits within 8mm-wide scanner housing; PG confirms rail stability pre-scan. |
Use Scenario: Sub-GHz LoRaWAN gateway with deep-sleep mode (1μA system current) and periodic 2-second wake-up for packet forwarding. IC Role / Device Role / Timing Role: Always-on 2.5V rail for real-time clock, secure element, and wake-up controller; powers main SoC only during active intervals. Use Value: 25μA IQ dominates total sleep current budget; soft-start (0.5ms) prevents inrush into large supercapacitor backup; hiccup-mode SCP protects against antenna fault events. |
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 | Fixed 2.5V, 1A, 22μA IQ, 3MHz switching, WSON-6 (2mm×2mm) | Higher frequency enables smaller inductors but increases EMI sensitivity; no output discharge or PG pin | Select for ultra-compact designs where board area is more constrained than EMI margin; verify layout filtering for 3MHz harmonics. |
| Analog Devices ADP2302AUJZ-2.5-R7 | Fixed 2.5V, 0.6A, 25μA IQ, 1.4MHz, TSOT-23-6 | Lower current rating limits use to sub-600mA loads; lacks PG and output discharge; wider input range (2.3–5.5V) | Choose only if load current ≤0.6A and PG/output discharge are not required; verify thermal derating at 0.6A in TSOT-23. |
Compared with TPS62231DRYR and ADP2302AUJZ-2.5-R7, MP2151GTF-25-Z uniquely combines 1A capability, 25μA IQ, output discharge, and PG in the smallest SOT563 footprint-making it optimal for battery-critical, space-limited 2.5V systems needing full feature integration.
Availability
MP2151GTF-25-Z is available at Aetrix Electronics and suitable for portable instrumentation, wireless sensor networks, and low-power industrial handhelds requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2151GTF-25-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-low-power, space-constrained DC/DC conversion in battery-operated and energy-harvesting applications-emphasizing minimal IQ, integrated MOSFETs, and simplified layout for rapid time-to-market.
FAQ
What is the purpose of the PG pin on MP2151GTF-25-Z?
The PG (power good) pin is an open-drain output that signals when the 2.5V output is within ±5% of regulation (90–105%). It requires an external 100–500kΩ pull-up resistor to VIN or VOUT. When asserted, PG indicates stable rail conditions for safe MCU boot or peripheral enablement-critical for deterministic power sequencing in multi-rail systems.
Does MP2151GTF-25-Z require external feedback resistors?
No. MP2151GTF-25-Z is a fixed-output variant with internal feedback network set to 2.5V. Unlike the adjustable MP2151GTF, it omits FB pin functionality and instead uses PG on pin 5. This eliminates resistor tolerance errors and layout sensitivity, improving output accuracy to ±1.5% over temperature without external components.
How does the output discharge function operate?
When EN is pulled low, the MP2151GTF-25-Z activates an internal 200Ω discharge path between OUT and GND. This rapidly discharges the output capacitor, collapsing VOUT within milliseconds. It prevents back-powering of upstream circuitry, avoids latch-up in mixed-voltage systems, and ensures clean reset behavior during power cycling or battery replacement.
Can MP2151GTF-25-Z operate with input voltage below 2.5V?
No. The absolute minimum input voltage is 2.5V per datasheet specifications, with UVLO rising threshold at 2.45V typical. Operation below this level disables regulation and may cause unpredictable behavior. For sub-2.5V inputs, consider boost or buck-boost alternatives like MPS MP2166 or TI TPS61099.
What thermal performance can be expected in SOT563 package?
In standard 2-layer PCB layout (EV2151-TF-00A), θJA is 80°C/W. At 1A load and 5V input, junction temperature rise is ~65°C above ambient-well within 125°C max TJ. For sustained 1A operation, use ≥2cm² copper pour under exposed pad and minimize trace resistance to GND for optimal thermal dissipation.
Is MP2151GTF-25-Z pin-compatible with other MP2151 variants?
Yes-MP2151GTF-25-Z shares identical SOT563 pinout and footprint with MP2151GTF (adjustable), MP2151GTF-12, -15, -18, and -33. Only pin 5 differs functionally: FB on adjustable versions versus PG on fixed-output versions. Layout reuse is possible, but schematic must route pin 5 appropriately per variant.
What is the minimum off-time specification and why does it matter?
Minimum off-time is 100ns. This parameter prevents inductor current runaway during large load transients by enforcing a lower bound on switching period. It ensures stable operation even at high duty cycles (e.g., VIN=2.7V → VOUT=2.5V), avoiding subharmonic oscillation and maintaining COT loop integrity across the full input range.
MP2151GTF-25-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- SOT-563, SOT-666
- 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):
- 2.5V
- 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:
- SOT-563
MP2151GTF-25-Z FAQ
1.How can I place an order for MP2151GTF-25-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2151GTF-25-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 MP2151GTF-25-Z reliable?
The price and inventory of MP2151GTF-25-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2151GTF-25-Z is usually 5 days.
3.What payment methods are accepted for MP2151GTF-25-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2151GTF-25-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2151GTF-25-Z?
MP2151GTF-25-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2151GTF-25-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 MP2151GTF-25-Z?
For technical support, including MP2151GTF-25-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2151GTF-25-Z requirements.
6.How does Aetrix verify that MP2151GTF-25-Z is sourced from the original manufacturer or authorized distributors?
All MP2151GTF-25-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 MP2151GTF-25-Z meets industry standards.
7.What is the process for return or replacement of MP2151GTF-25-Z?
All MP2151GTF-25-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2151GTF-25-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 MP2151GTF-25-Z part is unused and in its original packaging.
Return procedure for MP2151GTF-25-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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