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Monolithic Power Systems Inc. MP2171GJ-Z
- Part No.:
- MP2171GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2171GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,141
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Product details
Overview
MP2171GJ-Z from Monolithic Power Systems is a monolithic synchronous step-down DC/DC converter with integrated 90mΩ high-side and 50mΩ low-side MOSFETs, delivering up to 1A continuous output current from a 2.5V–5.5V input while regulating output down to 0.6V. It employs constant-on-time (COT) control for fast transient response and operates at a default 2.6MHz switching frequency with 3.3V input and 1.8V output - ideal for space-constrained automotive infotainment power rails.
For engineers reviewing the MP2171GJ-Z datasheet, MP2171GJ-Z pinout, MP2171GJ-Z application, or MP2171GJ-Z equivalent, key selection criteria include its TSOT23-8 package footprint, EN/PG interface support for power sequencing, ±10% power-good window, 100% duty-cycle capability in dropout, and compatibility with low-ESR ceramic output capacitors without external compensation.
Technical Context
The MP2171GJ-Z uses input-voltage feed-forward COT control to maintain stable switching frequency across its full 2.5V–5.5V input range and adjustable 0.6V–(VIN−0.5V) output range. Its internal power stage integrates matched P-channel and N-channel MOSFETs with on-resistances of 90mΩ and 50mΩ respectively, enabling high efficiency at light and full load.
It features dual ground pins (PGND and AGND) for noise isolation, an open-drain PG pin with 500kΩ internal pull-up to VIN, and hiccup-mode short-circuit protection triggered by 4A cycle-by-cycle current limiting on the high-side switch - all implemented without requiring external loop compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 2.5V to 5.5V - supports single-cell Li-ion, USB, and automotive 3.3V/5V rails without pre-regulation |
| Output voltage range | 0.6V to (VIN − 0.5V) - enables core logic supply for modern SoCs and microcontrollers |
| Max output current | 1A continuous - sufficient for FPGA I/O banks, DSP cores, and display interface ICs |
| Switching frequency | 2.6MHz typical (VIN=3.3V, VOUT=1.8V) - allows use of sub-1μH inductors and compact 22μF ceramic output caps |
| Feedback reference | 600mV ±12mV - sets precise output regulation via external resistor divider with <100nA bias current |
| Power good threshold | ±10% window around FB voltage - provides reliable rail-valid indication for sequenced power-up of multi-rail systems |
| Thermal shutdown | 170°C with 30°C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
MP2171GJ-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density PCB layouts with exposed thermal pad connection to PGND. The pinout supports clean separation of power and analog grounds, critical for stable COT operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled high to VIN via internal 500kΩ resistor when FB is within ±10% of 600mV; sinks ≥1mA at 400mV for robust system monitoring |
| 2 - VIN | Main input supply | Accepts 2.5V–5.5V; requires local 10μF ceramic capacitor to suppress high-frequency switching noise |
| 3 - SW | Internal switch node | Connects to external inductor; high dv/dt node requiring minimal trace length and isolation from sensitive analog paths |
| 4 - PGND | Power ground return | Reference for MOSFETs and SW node; must be tied to large copper pour with multiple vias to minimize ground bounce |
| 5 - OUT | Output voltage sense | Direct connection point for output capacitor; used internally for current limit sensing and soft-stop discharge control |
| 6 - AGND | Analog ground reference | Reference for FB, EN, and internal error amplifier; must be isolated from PGND except at single-point star connection |
| 7 - FB | Feedback input | High-impedance node (10–100nA bias) for resistor-divider-based output voltage setting; placement near AGND minimizes noise pickup |
| 8 - EN | Enable control | Active-high logic input (1.2V threshold); internal 1MΩ pulldown allows floating-disable; supports precise power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Constant-on-time (COT) control | Eliminates need for external compensation network and delivers <10μs load transient recovery time for dynamic SoC loads |
| Integrated MOSFETs | 90mΩ P-FET + 50mΩ N-FET enable >90% peak efficiency at 1A/1.8V out from 3.3V in, reducing BOM count and layout area |
| 100% duty-cycle operation | Maintains regulation during input voltage sag (e.g., cold-crank automotive conditions) without dropout or reset |
| Auto-discharge at shutdown | Actively discharges output capacitor through internal path when EN is deasserted - prevents residual voltage hazards in safety-critical systems |
| Hiccup-mode short-circuit protection | Enters safe, low-power retry mode upon SCP detection instead of latching off - enables autonomous recovery after fault removal |
Applications
| Automotive Infotainment | Portable Instrumentation |
|---|---|
|
Use Scenario: Powering audio DSP, touchscreen controller, and CAN transceiver in head-unit modules. IC Role / Device Role / Timing Role: Primary 1.8V/1A buck regulator supplying core logic voltage with tight ripple (<20mVpp) and fast load-step response. Use Value: 2.6MHz operation avoids AM radio band interference; PG signal coordinates boot sequence with MCU and display driver ICs. |
Use Scenario: Supplying 1.2V core voltage to ARM Cortex-M7 microcontroller in handheld test equipment. IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling >10-hour battery life with Li-ion input and dynamic voltage scaling. Use Value: 0.6V feedback reference and COT architecture allow stable regulation even under 100mA–1A dynamic load swings typical of sensor acquisition bursts. |
| Automotive Cluster Display | Low-Voltage I/O System Power |
|
Use Scenario: Generating 3.3V rail for TFT LCD bias and SPI interface in digital instrument clusters. IC Role / Device Role / Timing Role: Secondary buck converter fed from main 5V domain, providing regulated, low-noise supply for display timing ICs. Use Value: EN pin enables synchronized power-up with backlight driver; thermal shutdown ensures reliability in sealed, high-temp dashboard environments. |
Use Scenario: Delivering 1.0V/1A to FPGA I/O banks in industrial PLC modules with mixed 1.8V/3.3V interfaces. IC Role / Device Role / Timing Role: Compact, high-PGD (200μs) power-good source ensuring FPGA configuration completes only after stable VCCIO. Use Value: TSOT23-8 footprint fits dense I/O carrier boards; ±10% PG window tolerates aging of external resistors over 10-year field life. |
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 4MHz default frequency; 0.5V–5.5V output range; lower 300μA IQ; no integrated PG | Lacks power-good output and hiccup-mode SCP - requires external monitoring circuitry for safety-critical automotive use | Select when ultra-low quiescent current and smallest possible inductor size outweigh need for integrated fault signaling |
| RT7295BGJ8F | Fixed 2.4MHz frequency; 0.6V–5.5V output; 600mV reference; includes spread-spectrum modulation | Spread spectrum reduces EMI peaks but adds complexity to EMC filtering; no auto-discharge function | Prefer for noise-sensitive RF co-location where deterministic EMI reduction is prioritized over startup/shutdown behavior |
Compared with TPS62865RQYR and RT7295BGJ8F, MP2171GJ-Z uniquely combines integrated power-good signaling, hiccup-mode short-circuit recovery, and auto-output discharge - making it optimal for automotive and portable systems requiring autonomous fault handling and strict power sequencing without added discrete components.
Availability
MP2171GJ-Z is available at Aetrix Electronics and suitable for automotive infotainment, portable instrumentation, and low-voltage I/O system power applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP2171GJ-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 across Asia and North America and global manufacturing partnerships.
The MP2171 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for space-constrained, thermally demanding applications in automotive, industrial, and portable electronics where minimal external components and robust protection are mandatory.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP2171GJ-Z is stable with ≥22μF low-ESR ceramic output capacitors. This value ensures <20mVpp ripple at 1A load and maintains phase margin above 45° across temperature and input voltage ranges. Using smaller values risks instability due to insufficient energy storage during heavy load transients.
Does MP2171GJ-Z require external compensation components?
No - the MP2171GJ-Z uses constant-on-time (COT) control architecture with built-in input-voltage feed-forward, eliminating the need for external compensation networks. Stability is achieved solely through proper selection of output capacitor ESR and inductance, per the manufacturer's layout guidelines.
How does the power-good (PG) pin behave during undervoltage or overvoltage conditions?
PG goes low when FB voltage falls below 85% or rises above 120% of the 600mV reference (i.e., outside ±10% window). It remains low until FB returns to the 90–110% range for ≥200μs, preventing false assertions during brief transients. The open-drain output pulls to ground via internal MOSFET when inactive.
Can MP2171GJ-Z operate with input voltage below 2.5V?
No - the absolute minimum operating input is 2.5V, enforced by an under-voltage lockout (UVLO) threshold of 2.2V (typical) with 150mV hysteresis. Below this, the device remains disabled and draws <2μA shutdown current. Operation below 2.5V violates guaranteed specifications and may cause erratic regulation or failure to start.
What is the thermal performance limitation in a standard 4-layer PCB layout?
On a JEDEC-standard 4-layer board, the MP2171GJ-Z has θJA = 100°C/W. At 1A load and 5V input, junction temperature rise is ~75°C above ambient, limiting maximum ambient operation to +50°C for 125°C max TJ. Adding thermal vias under the exposed pad reduces θJA to ~65°C/W, enabling full 1A operation up to +85°C ambient.
Is the soft-start time adjustable externally?
No - soft-start is fixed at 1.3ms (typical) and not user-adjustable. The internal soft-start capacitor ramps the reference voltage linearly to prevent output overshoot during startup. Soft-stop duration is similarly fixed at 0.9ms (typical) to ensure controlled discharge of the output capacitor when EN is deasserted.
How does the MP2171GJ-Z handle short-circuit events on the output?
Upon detecting 4A peak switch current, the MP2171GJ-Z enters hiccup mode: it disables switching, discharges the soft-start capacitor, waits ~10ms, then attempts soft-start again. This cycle repeats until the short is removed. During hiccup, average input current drops to <1mA, minimizing stress on input capacitors and PCB traces.
MP2171GJ-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:
- Obsolete
- 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):
- 5V
- Current - Output:
- 1A
- Frequency - Switching:
- 2.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2171GJ-Z FAQ
1.How can I place an order for MP2171GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2171GJ-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 MP2171GJ-Z reliable?
The price and inventory of MP2171GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2171GJ-Z is usually 5 days.
3.What payment methods are accepted for MP2171GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2171GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2171GJ-Z?
MP2171GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2171GJ-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 MP2171GJ-Z?
For technical support, including MP2171GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2171GJ-Z requirements.
6.How does Aetrix verify that MP2171GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2171GJ-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 MP2171GJ-Z meets industry standards.
7.What is the process for return or replacement of MP2171GJ-Z?
All MP2171GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2171GJ-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 MP2171GJ-Z part is unused and in its original packaging.
Return procedure for MP2171GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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