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Monolithic Power Systems Inc. MP2161AGJ-P
- Part No.:
- MP2161AGJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2161AGJ-P.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,589
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Product details
Overview
MP2161AGJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 110mΩ high-side and 60mΩ low-side MOSFETs, delivering up to 2A continuous output current from a 2.5V–6V input range while regulating output down to 0.6V. It employs constant-on-time (COT) control for fast transient response, features 17μA quiescent current, 1.5% VFB accuracy, and integrated power-good and enable functions - ideal for powering FPGAs and portable instrumentation.
For engineers reviewing the MP2161AGJ-P datasheet, MP2161AGJ-P pinout, MP2161AGJ-P application, or MP2161AGJ-P equivalent, key selection criteria include its TSOT23-8 package footprint, 1.5MHz switching frequency stability across input voltage, hiccup-mode short-circuit protection, and compatibility with low-ESR ceramic output capacitors in space-constrained battery-powered systems.
Technical Context
The MP2161AGJ-P uses a constant-on-time (COT) control architecture with input-voltage feedforward to maintain near-constant 1.5MHz switching frequency across 2.5V–6V input and 0.6V–VIN output ranges. Its internal power stage integrates complementary P-channel and N-channel MOSFETs with on-resistances of 110mΩ and 60mΩ respectively.
It implements cycle-by-cycle over-current protection, thermal shutdown at 150°C with 30°C hysteresis, and a dedicated open-drain PG pin with 550kΩ internal pull-up to VIN and ±10% regulation window detection. Soft-start time is fixed at 1.15ms (typ), and minimum off-time is clamped at 60ns to prevent sub-harmonic oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports single-cell Li-ion, dual-cell alkaline, and USB-powered systems without external LDO pre-regulation. |
| Output Current | 2A continuous - sufficient for core logic rails of mid-tier FPGAs and DSPs with margin for transient peaks. |
| Quiescent Current | 17μA - enables >10-year battery life in always-on sensor nodes operating at light load. |
| Feedback Accuracy | ±1.5% at 25°C - ensures tight output regulation critical for I/O voltage domains requiring <±2% tolerance. |
| Switching Frequency | 1.5MHz ±20% - allows use of compact 1μH inductors and fits within EMI-sensitive bands above AM radio spectrum. |
| Power Good Threshold | ±10% around VFB - provides reliable system power sequencing signal for downstream processors and PMICs. |
| Thermal Shutdown | 150°C with 30°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
MP2161AGJ-P is housed in an 8-pin TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density portable PCB layouts. The exposed PGND pad enhances thermal performance and reduces ground impedance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled high to VIN via 550kΩ internal resistor when FB is within ±10% of 0.6V; sinks current when out-of-regulation - used for system reset or sequencing control. |
| 2 - VIN | Main input supply | Accepts 2.5V–6V unregulated input; requires local 10μF ceramic capacitor to suppress high-frequency switching noise. |
| 3 - SW | Switch node | Connects to external inductor; carries high di/dt square wave - must be routed short and away from sensitive analog traces like FB. |
| 4 - PGND | Power ground | High-current return path for MOSFETs and inductor; tied to exposed thermal pad for optimal heat dissipation. |
| 5 - OUT | Output voltage sense | Direct connection to output rail; used internally for current sensing and hiccup-mode recovery timing. |
| 6 - AGND | Analog ground reference | Separate low-noise ground for feedback amplifier and reference circuitry - must be connected to PGND at single point near IC. |
| 7 - FB | Feedback input | Resistor-divider tap point; sets output voltage per VOUT = 0.6V × (1 + R1/R2); bias current ≤50nA minimizes divider error. |
| 8 - EN | Enable control | Active-high logic input; device enabled when >1.2V, disabled when <0.4V or floating (internal 1MΩ pulldown). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 17μA quiescent current enables micropower standby modes without sacrificing startup speed or regulation accuracy. |
| COT control with feedforward | Maintains stable 1.5MHz switching across full VIN and VOUT range - eliminates need for external compensation network. |
| Integrated dual-MOSFET power stage | 110mΩ PCH / 60mΩ NCH switches reduce conduction loss and eliminate external gate drivers or discrete FETs. |
| Hiccup-mode short-circuit protection | Disables output, discharges soft-start cap, then retries - prevents thermal runaway during sustained fault conditions. |
| 100% duty-cycle capability | Enables dropout operation down to VIN – VOUT ≈ 0.3V - supports brownout recovery and low-VIN hold-up scenarios. |
Applications
| Wireless Networking Card Power | Portable Instrument Core Rail |
|---|---|
|
Use Scenario: Powers 1.2V FPGA fabric and 1.8V I/O banks on PCIe Mini Card-based Wi-Fi 6 modules. IC Role / Device Role / Timing Role: Primary synchronous buck regulator supplying configurable logic domain with fast load-step response. Use Value: 1.5MHz switching enables <1.5mm² total solution size; COT control maintains <15mV output deviation during 1A/μs load transients. |
Use Scenario: Supplies 3.3V microcontroller core and 1.2V ADC reference in handheld multimeter designs. IC Role / Device Role / Timing Role: Main system PMIC buck stage with EN-controlled power sequencing and PG-synchronized initialization. Use Value: 17μA IQ extends 2×AA battery life to >18 months in sleep mode; ±1.5% VFB accuracy ensures ADC measurement repeatability. |
| Battery-Powered IoT Sensor Node | Low-Voltage I/O System Power |
|
Use Scenario: Generates 1.8V rail for BLE SoC and 3.3V for environmental sensors in coin-cell–powered asset trackers. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating across 2.7V–4.2V Li-ion discharge curve. Use Value: 100% duty-cycle mode sustains regulation down to 2.1V input; hiccup protection prevents battery drain during sensor short events. |
Use Scenario: Provides 0.9V core voltage for ARM Cortex-M7 MCU and 1.8V for LPDDR interface in embedded edge AI modules. IC Role / Device Role / Timing Role: Precision adjustable buck regulator with external resistor divider for multi-rail voltage scaling. Use Value: 0.6V reference and ±1.5% accuracy allow stable 0.9V output with <±10mV drift over -40°C to +85°C. |
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 |
|---|---|---|---|
| TPS62865RQYR | Higher 4A output, 2.5V–5.5V input, 2.5MHz switching, but 25μA IQ and no integrated PG pin. | Requires external power-good circuitry; better suited for higher-current applications where board area permits larger inductor. | Select when >2A load current or faster transient response is required, and PG can be implemented externally. |
| RT7295BGJ8F | 2A output, 4.5V–18V input, 500kHz switching, 30μA IQ, and built-in PG - but larger SOT-23-6 package limits layout density. | Supports wider input range for industrial 12V bus systems, but lower switching frequency demands larger magnetics. | Select when input exceeds 6V or ambient temperature exceeds +105°C, accepting larger solution size and reduced efficiency at light load. |
Compared with TPS62865RQYR and RT7295BGJ8F, MP2161AGJ-P delivers optimal balance of ultra-low IQ, compact TSOT23-8 footprint, and integrated PG functionality for space- and battery-limited 2.5V–6V applications - making it preferred for portable instrumentation and wireless edge devices where thermal headroom and PCB real estate are constrained.
Availability
MP2161AGJ-P is available at Aetrix Electronics and suitable for wireless networking cards, portable instrumentation, and battery-powered IoT sensor nodes requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for MP2161AGJ-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 analog and mixed-signal ICs for power management, motion control, and automotive applications.
The MP2161A belongs to MPS's high-efficiency, low-IQ synchronous buck converter product line, designed specifically for space-constrained, battery-operated portable electronics requiring fast transient response and minimal standby power loss.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2161AGJ-P is stable with ≥10μF ceramic output capacitance having low ESR. Using X5R/X7R dielectric types ensures minimal voltage ripple (<15mV peak-to-peak at 2A load) and avoids phase-margin degradation. Smaller values may cause instability under heavy transient loads.
Can MP2161AGJ-P operate with input voltage below 2.5V?
No - the absolute minimum operating input voltage is 2.5V per datasheet specifications. Below this, UVLO disables the device. The under-voltage lockout rising threshold is 2.3V (typ), with 260mV hysteresis, ensuring reliable start-up only within the rated 2.5V–6V range.
How does the PG pin behave during startup and fault conditions?
During startup, PG remains low until VOUT reaches 90% of target (e.g., 1.08V for 1.2V output); it then pulls high to VIN via internal 550kΩ resistor. During over-current or thermal shutdown, PG goes low within 50μs and stays low until regulation is restored for >100ms.
Is external compensation required for loop stability?
No - the MP2161AGJ-P uses constant-on-time control with inherent stability across all valid input/output combinations. No external compensation components are needed, simplifying design and reducing BOM count versus voltage-mode PWM controllers.
What is the maximum allowable junction temperature during continuous operation?
The maximum junction temperature is 150°C, with thermal shutdown activating at that threshold and 30°C hysteresis. At TA = +25°C, the TSOT23-8 package supports up to 1.25W continuous power dissipation - corresponding to ~2A at 1.2V output with typical efficiency.
Does MP2161AGJ-P support forced PWM or DCM mode selection?
No - it automatically transitions between CCM and DCM based on load. At light load, it disables the low-side switch upon zero-current detection to minimize reverse inductor current and improve efficiency, without user-configurable mode selection.
What is the recommended PCB layout practice for minimizing EMI?
Route VIN, SW, and PGND traces as short and wide as possible; place input capacitor ≤2mm from VIN/PGND pins; isolate FB trace from SW and inductor; connect AGND and PGND at single point near IC; avoid routing sensitive analog traces near high-di/dt paths.
MP2161AGJ-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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):
- 6V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2161AGJ-P FAQ
1.How can I place an order for MP2161AGJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2161AGJ-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 MP2161AGJ-P reliable?
The price and inventory of MP2161AGJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2161AGJ-P is usually 5 days.
3.What payment methods are accepted for MP2161AGJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2161AGJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2161AGJ-P?
MP2161AGJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2161AGJ-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 MP2161AGJ-P?
For technical support, including MP2161AGJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2161AGJ-P requirements.
6.How does Aetrix verify that MP2161AGJ-P is sourced from the original manufacturer or authorized distributors?
All MP2161AGJ-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 MP2161AGJ-P meets industry standards.
7.What is the process for return or replacement of MP2161AGJ-P?
All MP2161AGJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2161AGJ-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 MP2161AGJ-P part is unused and in its original packaging.
Return procedure for MP2161AGJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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