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Monolithic Power Systems Inc. MP2181CGTL-P
- Part No.:
- MP2181CGTL-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-583
- Datasheet:
-
MP2181CGTL-P.pdf
- Description:
- IC REG BUCK ADJ 1A SOT583
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MP2181CGTL-P from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 90mΩ P-channel and 50mΩ N-channel MOSFETs, delivering up to 1A continuous output current across a 2.5V–5.5V input range, regulating output down to 0.6V with 1% FB accuracy, and featuring forced PWM mode, power good (PG), soft-start (SS), and thermal shutdown - deployed in portable instrumentation and low-voltage I/O power rails.
For engineers reviewing the MP2181CGTL-P datasheet, MP2181CGTL-P pinout, MP2181CGTL-P application, or MP2181CGTL-P equivalent, key selection criteria include its COT control architecture for fast transient response, SOT583 package footprint constraints, PG open-drain timing behavior, and soft-start capacitor sizing for inrush control in battery-powered systems.
Technical Context
The MP2181CGTL-P employs constant-on-time (COT) control with input-voltage feedforward, enabling stable ~1.2MHz switching frequency across input and output voltage variations while minimizing loop compensation complexity. Its internal high-side PCH and low-side NCH MOSFETs operate in synchronous rectification mode to maximize efficiency at light and full load.
Functional blocks include a 0.6V reference, soft-start ramp generator (3µA charge current), hiccup-mode short-circuit protection triggered by 2.5A peak PFET current limit, and dual-threshold power-good comparator (90% rising / 85% falling VFB) with 80µs delay and 400Ω max RDS(ON) sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB, and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | 1A continuous - sufficient for powering ARM Cortex-M microcontrollers, RF transceivers, or sensor signal chains. |
| Feedback Accuracy | ±1% at 25°C (594–606mV) - ensures tight output regulation critical for ADC references and precision analog circuits. |
| Switching Frequency | 1.2MHz nominal - enables use of compact 1µH shielded inductors and reduces EMI filtering burden. |
| MOSFET RDS(ON) | 90mΩ (HS), 50mΩ (LS) - minimizes conduction loss; achieves >90% efficiency at 1A/1.2V out from 3.6V input. |
| Soft-Start Control | External SS pin with 3µA charge current - allows precise startup slew rate tuning via capacitor (e.g., 2.2nF → ~1.3ms 10–90%). |
| Power Good Output | Open-drain PG with 80µs delay and 0.4V max sink @1mA - provides reliable system power sequencing signal for FPGA or DSP reset logic. |
Pinout & Package
SOT583 package: ultra-small 1.6mm × 2.1mm, 0.5mm pitch, 8-pin exposed-pad thermally enhanced leadframe. Pin 1 marked with dot; top-side marking "BMU".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PG | Power good indicator | Open-drain output asserting high when VFB ≥90% target; requires external 100kΩ–500kΩ pull-up to VIN or VOUT. |
| 2 VIN | Main input supply | Accepts 2.5–5.5V; must be decoupled with ≥10µF ceramic capacitor placed adjacent to pins 2 and 4. |
| 3 SW | Switch node | Drain of internal PCH MOSFET; connects directly to inductor; high dv/dt node requiring short, wide trace routing. |
| 4 GND | Power ground | Primary return path for input cap, output cap, and IC substrate; tied to exposed pad for thermal conduction. |
| 5 EN | Enable control | Active-high logic input (1.2V threshold); internal 2MΩ pulldown enables default-off operation. |
| 6 SS | Soft-start timing | Current-source input (3µA typ); capacitor to GND sets controlled VOUT ramp time and limits inrush current. |
| 7 OUT | Output power rail | Delivers regulated output; connects to load and output capacitor; also serves as current-sense return path. |
| 8 FB | Feedback input | High-impedance (≤100nA) node monitoring resistor divider; sets output voltage per VOUT = 0.6V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Forced PWM operation | Maintains fixed 1.2MHz switching under all load conditions - eliminates low-frequency beat notes in noise-sensitive audio or RF sections. |
| 100% duty cycle capability | Enables dropout operation down to VIN – VOUT ≈ 200mV - supports applications where input may dip near output voltage (e.g., Li-ion discharge). |
| Output discharge function | Internal 150Ω NMOS discharges VOUT when EN = low - prevents floating rail during standby and meets quick-power-down requirements. |
| VO OVP with hiccup recovery | Detects >115% VFB and enters dynamic regulation (LS-FET on until -1.5A) before entering hiccup mode - protects downstream loads during feedback fault. |
| Thermal shutdown | Triggers at 160°C junction temperature with 30°C hysteresis - safeguards against sustained overload or poor PCB thermal design. |
Applications
| Wireless Networking Cards | Portable Instruments |
|---|---|
Use Scenario: Powering 2.4GHz Wi-Fi/BLE SoCs (e.g., ESP32, nRF52840) from single-cell Li-ion batteries with dynamic current bursts up to 800mA. IC Role / Device Role / Timing Role: Primary buck regulator supplying core voltage (1.8V/3.3V) with forced PWM to avoid frequency interference in RF bands. Use Value: 1.2MHz switching avoids ISM band harmonics; PG signal synchronizes RF initialization sequence; SS prevents brownout during wake-from-sleep transitions. |
Use Scenario: Providing stable 1.2V core rail for low-power ARM Cortex-M4 microcontrollers in handheld multimeters or gas detectors. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with ultra-low quiescent current (450µA) extending battery life between measurements. Use Value: 90mΩ/50mΩ MOSFETs achieve >92% efficiency at 100mA load; 0.6V FB reference enables accurate low-voltage scaling; SOT583 footprint saves board space in compact enclosures. |
| Low-Voltage I/O System Power | Multi-Function Printers |
Use Scenario: Generating 0.9V–1.2V rails for DDR memory interfaces or FPGA I/O banks in embedded controllers. IC Role / Device Role / Timing Role: Precision-adjustable buck converter with ±1% FB accuracy ensuring signal integrity margins for high-speed digital interfaces. Use Value: 1% FB tolerance maintains <±15mV output deviation over temp; COT control delivers <5µs load transient recovery; PG confirms regulation before interface initialization. |
Use Scenario: Supplying 3.3V logic rail to scanner ASICs and motor drivers in compact inkjet printers with intermittent high-current pulses. IC Role / Device Role / Timing Role: Robust power stage with hiccup-mode short-circuit protection and output discharge - handles cable shorts and motor stall events safely. Use Value: Short-circuit recovery prevents system lockup; 150Ω discharge path clears residual charge in <10ms; thermal shutdown prevents damage during paper jam overheating. |
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 |
|---|---|---|---|
| MP2181GQUT-P | Same die in QFN-8 (2mm×2mm) package with wettable flanks; higher θJA (65°C/W vs. 58°C/W) but better thermal dissipation via exposed pad soldering. | Preferred for thermally constrained layouts needing >1A pulsed current or extended ambient (>85°C); requires rework-friendly assembly process. | Select when thermal margin is critical and PCB real estate allows larger footprint; not drop-in compatible due to different land pattern and pinout. |
| TI TPS62865RRLR | 1.8V–5.5V input, 3A output, 2.5MHz switching, ±0.5% FB accuracy; uses DCS-Control topology instead of COT; no PG or SS pins. | Better suited for high-current, high-precision applications (e.g., imaging sensors); lacks power sequencing signals needed in multi-rail systems. | Choose only if higher current or tighter regulation is required and PG/SS functionality can be implemented externally; requires redesign of feedback and layout. |
Compared with MP2181GQUT-P, the MP2181CGTL-P trades thermal headroom for minimal board area; versus TPS62865RRLR, it offers integrated sequencing features at lower current and relaxed accuracy - making it optimal for space-constrained, cost-sensitive 1A applications requiring PG and soft-start.
Availability
MP2181CGTL-P is available at Aetrix Electronics and suitable for wireless networking cards, portable instruments, low-voltage I/O system power, and multi-function printers requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MP2181CGTL-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, founded in 1997 and headquartered in Kirkland, Washington.
The MP2181 series belongs to MPS's ultra-compact DC-DC converter product line, designed specifically for space- and efficiency-critical portable and IoT edge devices operating from single-cell batteries or USB power sources.
FAQ
What is the minimum recommended output capacitor value for stable operation?
The MP2181CGTL-P requires ≥22µF ceramic output capacitance (X5R/X7R) with ≤10mΩ ESR for stable regulation at 1A load. Lower values risk instability or excessive ripple; using two 10µF capacitors in parallel improves high-frequency decoupling and thermal derating margin.
Does the MP2181CGTL-P support automatic power sequencing with other rails?
Yes - the EN pin accepts logic-level control (1.2V threshold) and the open-drain PG output (with external pull-up) provides a synchronized enable signal for downstream regulators. This allows cascaded sequencing: e.g., main 3.3V rail enables MP2181CGTL-P, whose PG then enables a 1.2V core rail.
How does the soft-start capacitor value affect startup behavior?
A 2.2nF capacitor on SS yields ~1.3ms soft-start time (10–90% VOUT); increasing to 10nF extends it to ~5.8ms. Larger values reduce inrush current and stress on input caps but increase boot time - critical for systems requiring rapid wake-up from deep sleep.
Can the MP2181CGTL-P operate with input voltage below 2.5V?
No - the absolute minimum operating input is 2.5V. Below this, UVLO disables the device. The under-voltage lockout rising threshold is 2.45V typical with 350mV hysteresis, preventing erratic operation near battery depletion.
What failure protections are built into the MP2181CGTL-P?
It integrates cycle-by-cycle current limiting (2.5A HS peak), thermal shutdown (160°C), output over-voltage protection (115% VFB), input OVP (6.1V), short-circuit hiccup mode, and output discharge on disable - eliminating need for external protection circuitry in most designs.
Is the SOT583 package RoHS and halogen-free compliant?
Yes - MP2181CGTL-P is fully RoHS-compliant, lead-free, and halogen-free per MPS green status documentation, meeting JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30°C/60% RH.
How does forced PWM mode improve system-level EMI performance?
Forced PWM eliminates variable-frequency operation in discontinuous conduction mode (DCM), concentrating switching energy at 1.2MHz and its harmonics - enabling predictable, narrowband EMI filter design rather than broadband noise suppression across 100kHz–10MHz.
MP2181CGTL-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-583
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- 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:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-583
MP2181CGTL-P FAQ
1.How can I place an order for MP2181CGTL-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2181CGTL-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 MP2181CGTL-P reliable?
The price and inventory of MP2181CGTL-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2181CGTL-P is usually 5 days.
3.What payment methods are accepted for MP2181CGTL-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2181CGTL-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2181CGTL-P?
MP2181CGTL-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2181CGTL-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 MP2181CGTL-P?
For technical support, including MP2181CGTL-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2181CGTL-P requirements.
6.How does Aetrix verify that MP2181CGTL-P is sourced from the original manufacturer or authorized distributors?
All MP2181CGTL-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 MP2181CGTL-P meets industry standards.
7.What is the process for return or replacement of MP2181CGTL-P?
All MP2181CGTL-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2181CGTL-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 MP2181CGTL-P part is unused and in its original packaging.
Return procedure for MP2181CGTL-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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