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Monolithic Power Systems Inc. MP2161GJ-Z
- Part No.:
- MP2161GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2161GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MP2161GJ-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 100mΩ high-side and 60mΩ low-side MOSFETs, delivering up to 2A continuous output current from a 2.5V–6V input while regulating output down to 0.6V. It employs Constant-On-Time (COT) control for fast transient response, features 17μA quiescent current, 1.5MHz switching frequency, and power-good signaling - deployed in FPGA core voltage regulation and portable instrument power rails.
For engineers reviewing the MP2161GJ-Z datasheet, MP2161GJ-Z pinout, MP2161GJ-Z application, or MP2161GJ-Z equivalent, key selection criteria include its TSOT23-8 footprint compatibility, 100% duty-cycle capability in dropout, hiccup-mode short-circuit protection, and support for ceramic output capacitors without external compensation.
Technical Context
The MP2161GJ-Z implements a COT control architecture with input-voltage feedforward to maintain stable 1.5MHz switching across 2.5V–6V input and 0.6V–VIN output ranges. Its internal PFET/NFET pair enables synchronous rectification with 100mΩ/60mΩ RDS(ON), supporting up to 2A load current and 100% duty cycle during input-to-output dropout conditions.
Protection includes cycle-by-cycle overcurrent limiting (3.2A typ), thermal shutdown at 150°C with 30°C hysteresis, and hiccup-mode recovery from short circuits. The EN pin supports logic-level enable/disable with 1.2V threshold, while the open-drain PG pin uses an internal 550kΩ pull-up to VIN and asserts when FB voltage deviates >±10% from 0.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports single-cell Li-ion, USB-powered, and dual-cell alkaline inputs without external LDO pre-regulation. |
| Output Current | 2A continuous - sufficient for powering FPGA I/O banks or ARM Cortex-A series cores with dynamic load steps. |
| Quiescent Current | 17μA - enables >10-year battery life in always-on sensor nodes powered by coin cells or small Li-SOCl₂ batteries. |
| Switching Frequency | 1.5MHz ±25% - allows use of sub-2mm height 1μH inductors and fits within EMI-sensitive 1–10MHz noise avoidance bands. |
| Feedback Voltage | 0.600V ±3% - sets precise output regulation; enables 1.2V, 1.8V, 2.5V, and 3.3V outputs using standard 1% resistor dividers. |
| Power Good Threshold | ±10% window around 0.6V - provides reliable rail validation for sequenced power-up of multi-rail SoCs without external comparators. |
| Thermal Shutdown | 150°C with 30°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking in compact enclosures. |
Pinout & Package
MP2161GJ-Z is housed in an 8-pin TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for space-constrained portable designs and requiring minimal external components: one input capacitor, one output capacitor, two feedback resistors, and one inductor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled high to VIN via internal 550kΩ resistor when FB is within ±10% of 0.6V; sinks current when out-of-regulation - used for system reset sequencing or fault logging. |
| 2 - VIN | Main power input | Accepts 2.5V–6V unregulated supply; requires local 10μF ceramic decoupling to suppress high-frequency switching noise and prevent input rail collapse. |
| 3 - SW | Switch node | Connects to inductor and diode-free synchronous rectifier path; carries high dv/dt pulses - must be routed short and away from sensitive analog traces like FB or AGND. |
| 4 - PGND | Power ground return | High-current return path for VIN, SW, and OUT; must be tied to solid copper pour under IC and separated from AGND except at single-point star connection. |
| 5 - OUT | Output voltage sense | Direct connection to output capacitor anode; senses regulated output for internal current limit and soft-start termination - not a feedback node. |
| 6 - AGND | Analog ground reference | Low-noise reference for internal error amplifier, comparator, and soft-start circuitry; must be isolated from noisy PGND until single-point tie. |
| 7 - FB | Feedback input | High-impedance (10–50nA) node connected to resistor divider from VOUT to GND; sets output voltage per VOUT = 0.6 × (1 + R1/R2). |
| 8 - EN | Enable control | Active-high logic input (1.2V threshold); internal 1MΩ pulldown ensures default disable - enables hardware-controlled power gating in battery-backed systems. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables <10μs load transient response without external loop compensation components - critical for FPGA core voltage stability during burst-mode processing. |
| Integrated Power MOSFETs | 100mΩ P-channel and 60mΩ N-channel switches eliminate external FETs and drivers, reducing BOM count and layout area by >30% vs discrete solutions. |
| 100% Duty-Cycle Operation | Maintains regulation when VIN drops to VOUT level (e.g., 3.3V input → 3.3V output), enabling seamless transition during brownout or battery sag conditions. |
| Hiccup-Mode Short-Circuit Protection | Disables output, discharges soft-start capacitor, then retries startup - limits average power dissipation to <100mW during sustained shorts, preventing thermal runaway. |
| Low-ESR Ceramic Capacitor Support | Stable operation with X5R/X7R MLCCs eliminates need for tantalum or aluminum electrolytics - improves reliability and reduces board area in consumer wearables. |
Applications
| Portable Instrument Power | FPGA Core Supply |
|---|---|
|
Use Scenario: Handheld multimeters and portable oscilloscopes powered by two AA batteries (2.4–3.2V) requiring clean 1.2V and 3.3V rails. IC Role / Device Role / Timing Role: Primary buck regulator generating FPGA I/O voltage and microcontroller core supply from shared battery source. Use Value: 17μA IQ extends battery life beyond 500 hours in sleep mode; 1.5MHz switching avoids audible noise and enables compact 1.0μH inductor placement. |
Use Scenario: Low-power FPGA development board with dynamic core voltage scaling between 0.85V and 1.2V based on computational load. IC Role / Device Role / Timing Role: Core voltage regulator responding to FPGA VCCINT demand changes with sub-20μs transient recovery. Use Value: COT control delivers <15mV undershoot during 1A load step; PG signal validates rail stability before releasing FPGA reset. |
| Wireless Network Card | Battery-Powered IoT Sensor Node |
|
Use Scenario: Mini-PCIe Wi-Fi 6 module in industrial gateway requiring 3.3V at 1.5A with strict EMI limits. IC Role / Device Role / Timing Role: Main 3.3V supply with EN controlled by host processor to gate power during RF sleep cycles. Use Value: 1.5MHz fixed frequency simplifies EMI filter design; TSOT23-8 footprint matches mini-PCIe layout constraints without compromising thermal performance. |
Use Scenario: LoRaWAN end-node powered by CR2032 coin cell, needing regulated 1.8V for MCU and 3.3V for RF transceiver. IC Role / Device Role / Timing Role: Primary step-down converter enabling ultra-low-power deep-sleep mode with 17μA quiescent draw. Use Value: 100% duty-cycle operation sustains 1.8V output as battery drains from 3.0V to 2.5V; hiccup protection prevents cell damage during accidental short. |
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 rating, 2.5V–5.5V input, 2.4MHz switching, but 25μA IQ and larger 10-pin WSON package. | Better suited for higher-current applications where board space permits larger IC and higher EMI filtering burden. | Select when >2A load headroom or faster transient response is required; avoid if coin-cell battery life or TSOT23-8 footprint is mandatory. |
| RT7295BGJ8F | 2A rating, 2.5V–5.5V input, 1.5MHz, 22μA IQ, but lacks PG pin and uses voltage-mode control with external compensation. | Requires additional passive components and layout effort for stability; no built-in power sequencing signal. | Choose only if PG functionality is unnecessary and cost-per-component is prioritized over design simplicity and time-to-market. |
Compared with TPS62865RQYR and RT7295BGJ8F, MP2161GJ-Z uniquely balances ultra-low IQ, integrated PG signaling, TSOT23-8 size, and COT simplicity - making it optimal for space- and battery-limited portable electronics where rapid load transients and rail validation are essential.
Availability
MP2161GJ-Z is available at Aetrix Electronics and suitable for portable instruments, wireless network cards, and battery-powered IoT sensor nodes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2161GJ-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2161 belongs to MPS's high-efficiency, low-IQ DC-DC converter product line, engineered specifically for battery-powered and space-constrained applications demanding minimal quiescent power and simplified layout.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2161GJ-Z is stable with ≥10μF ceramic output capacitance (X5R/X7R). For 1.2V/2A operation, a 22μF/6.3V X5R MLCC with ≤5mΩ ESR ensures <15mV peak-to-peak ripple and maintains phase margin above 45° without external compensation.
Does MP2161GJ-Z require an external soft-start capacitor?
No - MP2161GJ-Z integrates a 1.5ms typical soft-start timer that ramps the output voltage linearly from 0V to target, eliminating the need for external timing capacitors and reducing BOM count and layout complexity.
Can MP2161GJ-Z operate with input voltage equal to output voltage?
Yes - its 100% duty-cycle capability allows continuous regulation when VIN equals VOUT (e.g., 3.3V input → 3.3V output), enabling uninterrupted operation during battery voltage sag below the nominal output level.
How does the PG pin behave during startup and fault conditions?
The PG pin remains low until FB reaches 0.54V (−10%) and stays high only while FB remains between 0.54V and 0.66V (+10%). During startup, it asserts ~1.5ms after EN goes high; during overcurrent or thermal shutdown, it de-asserts within 50μs.
What is the maximum allowable PCB temperature rise for continuous 2A operation?
At TA = +25°C, the TSOT23-8 package has θJA = 100°C/W. With 1.25W max power dissipation, junction temperature reaches 150°C at 25°C ambient - meaning sustained 2A operation requires ≤25°C PCB temperature rise or forced airflow for higher ambient temperatures.
Is the EN pin internally pulled down, and what is its leakage current?
Yes - a 1MΩ internal resistor pulls EN to GND when floating. EN input current is 0μA at 0V and 1.5μA at 2V, enabling direct connection to GPIOs without external biasing or level-shifting in 3.3V or 1.8V logic domains.
Can MP2161GJ-Z be used in discontinuous conduction mode (DCM) at light loads?
Yes - its proprietary light-load control disables the low-side switch when inductor current reverses, entering DCM to reduce switching losses. This occurs automatically below ~100mA load, improving efficiency to >85% at 1mA output current.
MP2161GJ-Z 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
MP2161GJ-Z FAQ
1.How can I place an order for MP2161GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2161GJ-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 MP2161GJ-Z reliable?
The price and inventory of MP2161GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2161GJ-Z is usually 5 days.
3.What payment methods are accepted for MP2161GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2161GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2161GJ-Z?
MP2161GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2161GJ-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 MP2161GJ-Z?
For technical support, including MP2161GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2161GJ-Z requirements.
6.How does Aetrix verify that MP2161GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2161GJ-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 MP2161GJ-Z meets industry standards.
7.What is the process for return or replacement of MP2161GJ-Z?
All MP2161GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2161GJ-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 MP2161GJ-Z part is unused and in its original packaging.
Return procedure for MP2161GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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