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Monolithic Power Systems Inc. MP2151GTF-Z
- Part No.:
- MP2151GTF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-563, SOT-666
- Datasheet:
-
MP2151GTF-Z.pdf
- Description:
- IC REG BUCK ADJ 1A SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:4,900
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Product details
Overview
MP2151GTF-Z 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 regulating output down to 0.6V. It features constant-on-time (COT) control for fast transient response, 25μA quiescent current in light-load sleep mode, and output discharge during shutdown - ideal for space-constrained battery-powered devices requiring ultra-low IQ and rapid load-step performance.
For engineers reviewing the MP2151GTF-Z datasheet, MP2151GTF-Z pinout, MP2151GTF-Z application, or MP2151GTF-Z equivalent, key selection criteria include its SOT563 ultra-small package, 1.1MHz fixed switching frequency, 1% FB voltage accuracy (600mV ±6mV), cycle-by-cycle current limiting, thermal shutdown, and compatibility with standard 1µH inductors and 10–22µF ceramic output capacitors.
Technical Context
The MP2151GTF-Z implements constant-on-time (COT) control with input-voltage feed-forward, enabling stable 1.1MHz operation across its full 2.5V–5.5V input range and supporting output voltages as low as 0.6V via external resistor divider. Its internal power stage integrates complementary P/N-channel MOSFETs with on-resistances of 80mΩ/50mΩ, eliminating external switch requirements.
It operates in three distinct modes: continuous conduction mode (CCM) at medium-to-heavy loads, discontinuous conduction mode (DCM) at light loads, and deep-sleep AAM (asynchronous modulation) mode below ~1mA, where only the error amplifier and comparator remain active to sustain 25μA IQ. Output discharge is enabled automatically upon EN deactivation via an internal 200Ω NMOS path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and 3.3V/5V rail inputs without pre-regulation. |
| Output Current | 1A continuous - sufficient for powering core logic, RF transceivers, or sensor subsystems in portable electronics. |
| Quiescent Current | 25μA - enables >1-year battery life in always-on IoT sensors with 200mAh coin cells under typical duty cycles. |
| Feedback Voltage Accuracy | 600mV ±6mV (±1%) - ensures tight output regulation across temperature and line/load variations. |
| Switching Frequency | 1.1MHz - allows use of compact 1µH shielded inductors and reduces EMI filtering burden. |
| Internal MOSFET RDS(on) | 80mΩ (HS) / 50mΩ (LS) - minimizes conduction loss and enables >90% peak efficiency at 5V→1.2V/500mA. |
| Soft-Start Time | 0.5ms - prevents inrush current and output overshoot during power-up in systems with large downstream capacitance. |
| Output Discharge Resistance | 200Ω - actively discharges VOUT to GND within ~10ms after shutdown, meeting safety and sequencing requirements. |
Pinout & Package
SOT563 (1.6mm × 1.6mm × 0.55mm) - ultra-compact 6-pin package with 0.5mm pitch, optimized for high-density PCB layouts in wearables and compact modules.
| 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. |
| 2 SW | Switch node | Drain of internal high-side P-MOSFET; connects directly to inductor; carries high di/dt switching current. |
| 3 VIN | Input supply | Unregulated input (2.5–5.5V); requires local 10µF ceramic decoupling capacitor placed adjacent to pin. |
| 4 EN | Enable control | Active-high logic input (1.2V threshold); internal 1MΩ pull-down allows floating-disable; controls startup/shutdown sequencing. |
| 5 FB | Feedback input | Resistor-divider tap point; senses output voltage; sets regulation point via 0.6V internal reference. |
| 6 OUT | Output sense & power rail | Provides regulated output voltage; also serves as voltage sense point for internal OVP and discharge circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 25μA in sleep mode - extends battery runtime in always-on sensing nodes without compromising start-up speed. |
| Integrated power MOSFETs | 80mΩ HS + 50mΩ LS - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Output discharge function | 200Ω internal NMOS - ensures safe, controlled VOUT ramp-down during disable, critical for multi-rail sequencing. |
| Constant-on-time (COT) control | 1.1MHz fixed-frequency operation with input feed-forward - delivers <10µs load-transient recovery and simplifies loop compensation. |
| Comprehensive protection suite | Cycle-by-cycle current limit (1.8A), thermal shutdown (160°C), output OVP (115% VREF), and hiccup-mode SCP - enables robust operation in unattended embedded systems. |
| Adjustable output voltage | 0.6V minimum setpoint - supports modern low-voltage cores (e.g., ARM Cortex-M, RISC-V SoCs) and I/O rails. |
Applications
| Wireless Networking Cards | Portable Medical Sensors |
|---|---|
Use Scenario: Powering 2.4GHz BLE/Wi-Fi SoCs and RF front-ends in miniaturized USB dongles and M.2 modules. IC Role / Device Role / Timing Role: Primary buck regulator supplying 1.2V/1.8V core and I/O rails with fast transient response to burst-mode RF transmission. Use Value: 25μA IQ preserves battery life between transmissions; 1.1MHz switching avoids interference with 2.4GHz ISM band; SOT563 footprint fits constrained card-edge layouts. |
Use Scenario: Regulating power for wearable ECG/PPG sensor nodes operating from CR2032 or rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Main system supply delivering 3.3V analog and 1.2V digital rails with precise low-noise output and automatic discharge during sleep. Use Value: Output discharge prevents residual voltage from interfering with sensor biasing; 1% FB accuracy ensures consistent ADC reference stability; 0.5ms soft-start avoids false wake-ups. |
| Low-Power Industrial IoT Gateways | Multi-Function Printer Logic Subsystems |
Use Scenario: Supplying MCU, LoRaWAN transceiver, and isolated RS-485 interface in battery- or energy-harvesting–powered edge gateways. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator stepping 5V USB or 3.7V battery to 3.3V/1.8V system rails. Use Value: 90%+ efficiency at 100mA–500mA loads maximizes harvestable energy utilization; COT control maintains regulation during wide input fluctuations from solar/battery sources. |
Use Scenario: Providing clean, sequenced 1.2V and 1.8V supplies to ASICs and FPGA configuration logic in compact office printers. IC Role / Device Role / Timing Role: Secondary buck converter enabling independent power-up timing and brown-out immunity for digital subsystems. Use Value: EN pin enables precise power sequencing relative to main 5V/12V rails; PG signal (on fixed versions) confirms regulation before releasing reset; hiccup-mode SCP prevents latch-up during paper-jam faults. |
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 TPS62231DRYR | 2.05V–6.5V input, 1A, 20μA IQ, 3MHz switching, WSON-6 (1.5×1.5mm) | Higher fSW enables smaller inductors but increases EMI sensitivity; lacks output discharge | Select when board space is tighter than 1.6×1.6mm and EMI filtering is already implemented; avoid if discharge is required. |
| Analog Devices ADP5302ACBZ-1-R7 | 1.8V–5.5V input, 1A, 250nA IQ (ultra-low), 2.25MHz, 6-bump WLCSP (1.0×1.0mm) | Far lower IQ but limited input range and no output discharge; WLCSP requires microvia assembly | Prefer for multi-year battery life in ultra-low-duty-cycle sensors; not suitable for 5.5V input or discharge-critical systems. |
Compared with TPS62231DRYR and ADP5302ACBZ-1-R7, MP2151GTF-Z uniquely balances ultra-small SOT563 size, 25μA IQ, full 2.5–5.5V input support, and integrated output discharge - making it optimal for cost-sensitive, space-constrained, and sequencing-aware portable designs where moderate switching frequency is acceptable.
Availability
MP2151GTF-Z is available at Aetrix Electronics and suitable for wireless networking cards, portable medical sensors, low-power industrial IoT gateways, and multi-function printer logic subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2151GTF-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 over two decades of innovation in DC/DC converters, LED drivers, and motor drivers.
The MP2151 belongs to MPS's ultra-low-IQ synchronous buck converter product line, designed specifically for battery-powered and energy-sensitive applications where extended runtime, small form factor, and reliable power sequencing are critical.
FAQ
What is the maximum recommended output current for MP2151GTF-Z in SOT563 package?
The MP2151GTF-Z is rated for 1A continuous output current under typical conditions (TA = +25°C, 2-layer PCB, 63mm×63mm). Derating is required above +60°C ambient due to thermal limits; at +85°C, max continuous current drops to ~750mA based on θJA = 80°C/W and TJ(max) = 125°C. Layout with thermal vias under the exposed pad significantly improves performance.
Does MP2151GTF-Z support fixed-output voltage configurations?
No - MP2151GTF-Z is the adjustable version with FB pin; fixed-output variants (e.g., MP2151GTF-12, MP2151GTF-18) have internal feedback networks and replace FB with PG. The "-Z" suffix denotes tape-and-reel packaging and applies to both adjustable and fixed versions, but only the part number suffix (e.g., -12) determines output voltage configuration.
How does the output discharge function operate, and is it controllable?
Output discharge activates automatically when EN is pulled low or floats; an internal 200Ω NMOS connects OUT to GND, discharging the output capacitor. It cannot be disabled - this behavior is hardwired for safety and sequencing compliance. Discharge time depends on output capacitance (e.g., 22µF → ~5ms discharge to 10% VOUT).
Can MP2151GTF-Z be used with ceramic output capacitors only?
Yes - the MP2151GTF-Z is optimized for low-ESR ceramic capacitors (e.g., 10–22µF X5R/X7R). Its COT control architecture does not require ESR-based damping, unlike older voltage-mode controllers. Aluminum polymer or tantalum caps are unnecessary and may degrade transient response due to higher ESR.
What is the minimum inductor value recommended for stable operation?
MPS recommends 1µH as the standard inductor value (e.g., Coilcraft XAL5030-102MEB). Inductors as low as 0.47µH can be used with careful layout and increased ripple current, but 1µH provides optimal balance of size, efficiency (>90% at 500mA), and transient performance. DCR must remain ≤50mΩ to maintain thermal margin.
Is there a power-good (PG) signal available on MP2151GTF-Z?
No - PG is only present on fixed-output variants (e.g., MP2151GTF-12). The adjustable MP2151GTF-Z uses pin 5 for FB feedback and has no dedicated PG output. System-level power monitoring must be implemented externally using a voltage supervisor or ADC sampling of the regulated output.
What thermal performance can be expected on a standard 2-layer PCB?
On a 63mm×63mm 2-layer board per EV2151-TF-00A, θJA is 80°C/W. With 1A load at 5V→1.2V (efficiency ≈ 87%), power dissipation is ~150mW, resulting in ~12°C junction rise above ambient. Adding 4–6 thermal vias under the exposed pad reduces θJA by ~20°C/W, improving current capability and reliability.
MP2151GTF-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:
- 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:
- SOT-563
MP2151GTF-Z FAQ
1.How can I place an order for MP2151GTF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2151GTF-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-Z reliable?
The price and inventory of MP2151GTF-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-Z is usually 5 days.
3.What payment methods are accepted for MP2151GTF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2151GTF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2151GTF-Z?
MP2151GTF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2151GTF-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-Z?
For technical support, including MP2151GTF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2151GTF-Z requirements.
6.How does Aetrix verify that MP2151GTF-Z is sourced from the original manufacturer or authorized distributors?
All MP2151GTF-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-Z meets industry standards.
7.What is the process for return or replacement of MP2151GTF-Z?
All MP2151GTF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2151GTF-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-Z part is unused and in its original packaging.
Return procedure for MP2151GTF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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