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Monolithic Power Systems Inc. MPQ2171GJ-Z
- Part No.:
- MPQ2171GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MPQ2171GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,233
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Product details
Overview
MPQ2171GJ-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter delivering up to 1A continuous output current from a 2.5V–5.5V input, with 0.6V minimum output voltage, 2.6MHz nominal switching frequency (at 3.3VIN/1.8VOUT), and integrated 90mΩ high-side / 50mΩ low-side MOSFETs. It serves as a compact, automotive-grade power supply for infotainment domain controllers and instrument cluster microcontrollers.
For engineers reviewing the MPQ2171GJ-Z datasheet, MPQ2171GJ-Z pinout, MPQ2171GJ-Z application, or MPQ2171GJ-Z equivalent, key selection considerations include its COT control architecture for fast transient response, PG and EN pins for power sequencing in automotive subsystems, thermal shutdown at 170°C, and TSOT23-8 package constraints for high-density PCB layouts.
Technical Context
The MPQ2171GJ-Z employs constant-on-time (COT) control with input voltage feed-forward to maintain stable switching frequency across 2.5V–5.5V input and 0.6V–(VIN−0.5V) output ranges. Its internal power stage integrates complementary PCH/NCH MOSFETs with on-resistances of 90mΩ/50mΩ, enabling high efficiency at light-to-full load without external compensation.
It implements cycle-by-cycle over-current protection with 4A high-side current limit, hiccup-mode short-circuit recovery, and ±10% power-good window referenced to 0.6V feedback threshold. Soft-start (1.3ms typical) and soft-stop are activated only via EN pin control, with auto-discharge functionality during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports direct connection to automotive 3.3V/5V rails and battery-backed systems with brownout tolerance. |
| Output Current | Up to 1A continuous - sufficient for powering ARM Cortex-M7 microcontrollers, CAN transceivers, and display drivers in clusters. |
| Switching Frequency | 2.6MHz typical (at 3.3VIN/1.8VOUT) - enables use of sub-1µH inductors and reduces EMI filtering footprint. |
| Feedback Voltage | 600mV ±12mV (−40°C to +125°C) - sets precise output regulation with external resistor divider; enables 0.6V–5.0V programmable VOUT. |
| Thermal Shutdown | 170°C with 30°C hysteresis - protects against sustained overload or poor heatsinking in sealed automotive enclosures. |
| Power Good Threshold | ±10% window around 0.6V FB voltage - provides reliable rail validation for MCU reset sequencing in ASIL-B subsystems. |
| Quiescent Current | 720µA typical - maintains low standby power in always-on telematics modules with wake-on-CAN capability. |
Pinout & Package
MPQ2171GJ-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density in space-constrained automotive modules. The exposed pad (Pin 4 PGND) must be soldered to a thermal copper pour for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Open-drain power-good indicator | Pulled to VIN via internal 500kΩ resistor when FB is within ±10% of 0.6V; sinks >1mA at 400mV for MCU reset assertion. |
| 2 (VIN) | Main input supply | Accepts 2.5V–5.5V; requires local 10µF ceramic capacitor to suppress high-frequency switching noise. |
| 3 (SW) | Switch node | Drives external inductor; connects internally to high-side PCH and low-side NCH MOSFETs; requires minimal trace length to reduce EMI. |
| 4 (PGND) | Power ground | Reference for power switches; must be connected directly to thermal pad and separated from AGND to avoid ground bounce. |
| 5 (OUT) | Output voltage sense | Connects to output capacitor's positive terminal; used for accurate load regulation and soft-stop energy transfer path. |
| 6 (AGND) | Analog ground | Reference for feedback comparator and error amplifier; must be star-connected to FB and R1/R2 to minimize noise coupling. |
| 7 (FB) | Feedback input | Monitors voltage divider output; 10nA bias current allows use of high-value resistors (e.g., 41.2kΩ/41.2kΩ for 1.2V). |
| 8 (EN) | Enable control | Logic-high (>1.2V) enables operation; internal 1MΩ pulldown allows floating-disable; controls soft-start/soft-stop timing. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-on-time (COT) control | Enables <10µs load transient response without external loop compensation components, critical for burst-mode MCU operation. |
| Integrated 90mΩ/50mΩ MOSFETs | Eliminates external FETs and gate drivers, reducing BOM count and layout complexity while maintaining >90% peak efficiency at 1A. |
| 100% duty cycle capability | Permits dropout operation down to VOUT = VIN, supporting seamless transition during cold-crank (4.5V→2.5V) in automotive start-stop systems. |
| Hiccup-mode short-circuit protection | Shuts down output, discharges soft-start capacitor, then retries - prevents thermal runaway during connector short events in harness assemblies. |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C junction temperature operation with HTOL, TC, and ESD testing per automotive reliability standards. |
Applications
| Automotive Infotainment Head Unit | Instrument Cluster Microcontroller Supply |
|---|---|
|
Use Scenario: Powers ARM-based SoC (e.g., NXP i.MX8QuadMax) core logic and DDR memory interface in head-up display units. IC Role / Device Role / Timing Role: Primary 1.2V/1A point-of-load regulator with PG signal synchronized to SoC power-on reset sequence. Use Value: 2.6MHz switching avoids AM radio band interference; COT control maintains <50mV output deviation during GPU burst loads. |
Use Scenario: Supplies 3.3V/500mA to Renesas RH850/F1L MCU and TFT LCD controller in digital gauge clusters. IC Role / Device Role / Timing Role: Secondary regulated rail derived from main 5V bus; EN pin tied to vehicle ignition signal for controlled startup. Use Value: 100% duty cycle sustains 3.3V output during 6V→4V battery dip; PG confirms stable rail before MCU firmware execution. |
| Telematics Control Unit (TCU) | Portable Diagnostic Tool Power |
|
Use Scenario: Generates 1.8V/1A for LTE modem baseband processor and GNSS receiver in cellular-connected TCU modules. IC Role / Device Role / Timing Role: High-efficiency buck converter with EN-controlled soft-start to meet 3GPP power ramp requirements. Use Value: Low 720µA quiescent current extends battery life in parked mode; hiccup-mode SCP prevents damage during antenna cable shorts. |
Use Scenario: Provides regulated 3.3V output from single-cell Li-ion (2.7V–4.2V) in handheld OBD-II scanners. IC Role / Device Role / Timing Role: Input-voltage adaptive buck converter with UVLO at 2.2V to prevent brownout resets during battery discharge. Use Value: TSOT23-8 footprint fits compact handheld form factor; stable with low-ESR ceramic capacitors eliminates need for tantalum. |
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 |
|---|---|---|---|
| MPQ2177GJ-Z | Successor with improved 1.2A rating, lower 70mΩ/40mΩ RDS(on), and extended 2.2V–6V input range. | Supports higher-current processors and wider battery voltage swings in next-gen automotive ECUs. | Select MPQ2177GJ-Z for new designs requiring longer product lifecycle and higher efficiency at 1.2A. |
| TPS62840DLCR | TI part with 1.8V–6.5V input, 0.6V–5.5V output, 750mA rating, and 1.8MHz fixed-frequency PWM control. | Lacks AEC-Q100 qualification and hiccup-mode SCP; suited for industrial IoT, not automotive safety-critical systems. | Use TPS62840DLCR only in non-automotive applications where COT control and automotive qualification are not required. |
Compared with MPQ2171GJ-Z, MPQ2177GJ-Z offers higher current capability and broader input range for future-proofing, while TPS62840DLCR trades automotive qualification and protection features for lower quiescent current (300nA) in always-on battery systems.
Availability
MPQ2171GJ-Z is available at Aetrix Electronics and suitable for automotive infotainment head units, instrument cluster microcontrollers, and telematics control units requiring stable component supply under AEC-Q100 compliance and long-term automotive sourcing commitments.
Supply support for MPQ2171GJ-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 MPQ2171 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for ASIL-B compatible power management in infotainment, body electronics, and ADAS subsystems.
FAQ
Is MPQ2171GJ-Z recommended for new automotive designs?
No. MPQ2171GJ-Z is marked "NOT RECOMMENDED FOR NEW DESIGNS" per the official datasheet revision 1.01. Engineers should migrate to the pin-compatible successor MPQ2177GJ-Z, which offers higher current rating (1.2A), lower RDS(on), and extended input voltage range (2.2V–6V) while retaining AEC-Q100 Grade 1 qualification.
What is the function of the OUT pin, and why is it separate from PGND?
The OUT pin senses the output voltage at the capacitor's positive terminal to improve load regulation accuracy and enable safe energy transfer during soft-stop. It is electrically isolated from PGND to prevent ground-loop errors in high-current paths and to allow independent routing of power and feedback grounds for optimal noise immunity in automotive PCB layouts.
How does the MPQ2171GJ-Z handle short-circuit conditions?
Upon detecting over-current (≥4A high-side limit), the MPQ2171GJ-Z enters hiccup mode: it disables the power stage, discharges the soft-start capacitor, waits a recovery interval, then attempts soft-start again. This cycle repeats until the fault clears, limiting average power dissipation to prevent thermal damage during sustained shorts like harness pin-outs.
Can MPQ2171GJ-Z operate with ceramic output capacitors only?
Yes. Its COT control architecture is explicitly designed for stability with low-ESR ceramic capacitors (e.g., 22µF X7R). The datasheet confirms no additional ESR is required for loop compensation, eliminating the need for parallel tantalum or electrolytic capacitors and reducing board area and cost.
What is the maximum allowable output capacitance to prevent VIN overvoltage during soft-stop?
During soft-stop via EN, energy from the output capacitor (C2) transfers back to VIN. To avoid exceeding the 6V absolute maximum VIN rating, C2 must satisfy C2 < (C1 × (VIN − VOUT)²) / 36. For example, with C1 = 10µF, VIN = 5V, and VOUT = 1.2V, C2 must be less than 4µF - requiring careful selection when using large bulk capacitance.
Does MPQ2171GJ-Z support forced PWM or pulse-skipping modes?
No. MPQ2171GJ-Z uses fixed constant-on-time (COT) control with input voltage feed-forward and no user-selectable operating mode. It inherently transitions between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) based on load, but does not offer forced PWM, burst-mode, or skip-cycle options - simplifying design but limiting ultra-low-IQ operation.
What is the thermal resistance θJA for the TSOT23-8 package under standard JEDEC 4-layer PCB conditions?
The datasheet specifies θJA = 100°C/W for the TSOT23-8 package when mounted on a JEDEC-standard 4-layer PCB (JESD51-7). This value assumes 2oz copper, thermal vias under the exposed pad, and adequate copper pour area - actual board-level θJA will vary with layout and airflow, requiring derating above 85°C ambient for 1A continuous operation.
MPQ2171GJ-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):
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MPQ2171GJ-Z FAQ
1.How can I place an order for MPQ2171GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2171GJ-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 MPQ2171GJ-Z reliable?
The price and inventory of MPQ2171GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2171GJ-Z is usually 5 days.
3.What payment methods are accepted for MPQ2171GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2171GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2171GJ-Z?
MPQ2171GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2171GJ-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 MPQ2171GJ-Z?
For technical support, including MPQ2171GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2171GJ-Z requirements.
6.How does Aetrix verify that MPQ2171GJ-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2171GJ-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 MPQ2171GJ-Z meets industry standards.
7.What is the process for return or replacement of MPQ2171GJ-Z?
All MPQ2171GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2171GJ-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 MPQ2171GJ-Z part is unused and in its original packaging.
Return procedure for MPQ2171GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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