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Monolithic Power Systems Inc. MPQ2171GJ-AEC1-Z
- Part No.:
- MPQ2171GJ-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MPQ2171GJ-AEC1-Z.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MPQ2171GJ-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, 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, regulating down to 0.6V with constant-on-time (COT) control, and operating at a default 2.6MHz switching frequency - used in automotive infotainment power rails.
For engineers reviewing the MPQ2171GJ-AEC1-Z datasheet, MPQ2171GJ-AEC1-Z pinout, MPQ2171GJ-AEC1-Z application, or MPQ2171GJ-AEC1-Z equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and protection behavior, and real-world selection guidance against MPQ2177 and MPQ2172 for legacy design continuity and migration planning.
Technical Context
The MPQ2171GJ-AEC1-Z implements 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, achieving fast transient response without external compensation. Its internal power stage integrates matched P-channel (90mΩ) and N-channel (50mΩ) MOSFETs optimized for high-efficiency operation at 2.6MHz.
It features dual ground domains (PGND for power path, AGND for analog reference), open-drain power-good (PG) with ±10% regulation window and 500kΩ internal pull-up, cycle-by-cycle over-current protection with 4A high-side limit, hiccup-mode short-circuit recovery, and soft-start/soft-stop timing of 1.3ms/0.9ms respectively - all qualified per AEC-Q100 Grade 1 (−40°C to +125°C TJ).
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 UVLO at 2.2V (±0.2V). |
| Output Current | 1A continuous - sustained under full load with thermal shutdown at 170°C and 30°C hysteresis, validated in TSOT23-8 package. |
| Switching Frequency | 2.6MHz typical (2.0–2.7MHz range) - enables compact LC filter design using ≤1µH inductors and ceramic capacitors. |
| Feedback Voltage | 600mV ±12mV - sets precise output regulation; allows 0.6V minimum VOUT via resistor divider (e.g., 41.2kΩ/41.2kΩ for 1.2V). |
| Internal MOSFET RDS(on) | 90mΩ (HS), 50mΩ (LS) - minimizes conduction loss at 1A, enabling >90% peak efficiency at 3.3V→1.2V/1A. |
| Protection Features | Cycle-by-cycle OCP (4A), thermal shutdown, hiccup-mode SCP, auto-discharge at shutdown, and EN-controlled sequencing - ensures robust operation in automotive transients. |
| Power Good Accuracy | ±5% hysteresis, ±10% trip window relative to FB - provides reliable system power sequencing and fault detection without external comparators. |
Pinout & Package
MPQ2171GJ-AEC1-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.9mm), with exposed pad connected to PGND for improved heat dissipation and EMI performance. Pin 1 is marked by a dot or beveled corner on the top surface, located at the lower-left when reading top marking left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled high to VIN via 500kΩ internal resistor when FB is within ±10% of 0.6V; sinks current when out-of-regulation - enables safe system boot and fault signaling. |
| 2 - VIN | Main input supply | Accepts 2.5V–5.5V; requires local 10µF ceramic capacitor to suppress high-frequency switching noise and sustain current during SW transitions. |
| 3 - SW | Switch node | Connects to external inductor; carries high di/dt current - must be routed short and away from sensitive analog traces (FB, AGND) to minimize coupling. |
| 4 - PGND | Power ground | Reference for high-current paths (VIN, SW, OUT); requires dedicated copper pour with multiple vias to internal GND plane - critical for thermal and EMI performance. |
| 5 - OUT | Output voltage sense | Direct connection to output rail; used with internal comparator to monitor VOUT stability - improves load regulation accuracy vs. remote sensing limitations. |
| 6 - AGND | Analog ground | Reference for feedback, error amplifier, and internal bias - must be isolated from PGND except at single-point star connection near IC to prevent noise injection. |
| 7 - FB | Feedback input | Connects to resistor divider tap; 600mV reference enables precise VOUT programming; 10nA input bias minimizes divider current error. |
| 8 - EN | Enable control | Active-high logic (1.2V threshold); internal 1MΩ pulldown allows floating-disable; controls soft-start/soft-stop and power sequencing with 1.3ms ramp time. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Eliminates need for external compensation components and delivers <10µs load transient response - essential for automotive I/O rail stability during CAN/LIN bus activity. |
| Integrated Dual MOSFETs | 90mΩ HS + 50mΩ LS switches reduce BOM count and PCB area while maintaining >90% efficiency at 1A - avoids discrete FET layout complexity and gate drive losses. |
| AEC-Q100 Grade 1 Qualification | Validated for −40°C to +125°C junction temperature, including HTOL, TC, and ESD testing - meets functional safety requirements for cluster and telematics power supplies. |
| Power-Good with Hysteresis | ±5% hysteresis and 30–200µs delay ensure glitch-free system enable/disable sequencing - prevents false resets during brown-out or startup overshoot. |
| Hiccup-Mode Short-Circuit Protection | Disables output, discharges SS capacitor, then re-attempts soft-start - protects downstream circuitry during sustained overload without latch-off or thermal runaway. |
Applications
| Automotive Infotainment | Instrument Clusters |
|---|---|
|
Use Scenario: Powering display backlight drivers and audio codec ICs in head-unit systems with 3.3V or 5V battery input. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V core supply regulator with COT control ensuring fast response to burst-mode LCD refresh currents. Use Value: Delivers stable 1A output with <15mV ripple at 2.6MHz, eliminating need for post-LDO filtering and reducing thermal stress in confined dash space. |
Use Scenario: Generating 1.2V logic rail for microcontroller and 3.3V interface rail for CAN transceivers in digital instrument clusters. IC Role / Device Role / Timing Role: Dual-rail sequenced supply enabled via EN and PG pins, supporting ASAM-compliant boot timing and fault reporting. Use Value: Integrated PG signal replaces external supervisor IC; ±10% window ensures reliable MCU reset assertion before firmware execution begins. |
| Telematics Control Units | Low-Voltage I/O Systems |
|
Use Scenario: Supplying 1.8V to GNSS baseband processors and 3.3V to LTE modem interfaces in vehicle connectivity modules. IC Role / Device Role / Timing Role: High-frequency buck converter co-located with RF sections - minimized EMI via 2.6MHz operation and tight SW loop layout. Use Value: TSOT23-8 footprint and ceramic-capable design allow placement adjacent to RF ICs without compromising sensitivity or passing CISPR-25 Class 5. |
Use Scenario: Regulating 0.6V–1.2V rails for FPGA I/O banks or ASIC auxiliary supplies in portable diagnostic tools. IC Role / Device Role / Timing Role: Compact, low-noise step-down regulator with 100% duty-cycle capability for near-dropout operation during battery sag. Use Value: Maintains regulation down to VIN = VOUT + 0.5V, extending usable runtime in 3.6V Li-ion powered handheld devices beyond competing 500mA solutions. |
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-AEC1-Z | Successor with 2A rating, 3.5MHz default fSW, improved light-load efficiency, and extended VIN range (2.2V–5.5V). | Supports higher-current SoCs and tighter EMI filters; requires updated LC component values due to higher fSW. | Select for new designs requiring >1A or stricter EMI compliance; pinout and footprint compatible but not drop-in due to different soft-start and PG thresholds. |
| MPQ2172GJ-AEC1-Z | Lower-cost variant with 0.6A rating, same 2.6MHz fSW and feature set, but reduced thermal performance (θJA = 120°C/W). | Suitable for non-critical sub-systems like LED drivers or sensor interfaces where 1A headroom is unnecessary. | Use only where peak load remains ≤600mA and ambient temperature stays below 85°C - verify thermal margin with actual board layout. |
Compared with MPQ2171GJ-AEC1-Z, MPQ2177 offers higher current and frequency for next-gen platforms, while MPQ2172 reduces cost for lower-power nodes - both retain AEC-Q100 Grade 1 qualification and TSOT23-8 packaging, enabling scalable platform design.
Availability
MPQ2171GJ-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, instrument clusters, and telematics control units requiring stable component supply amid ongoing product transition to MPQ2177.
Supply support for MPQ2171GJ-AEC1-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 over two decades of leadership in DC/DC conversion, motor drivers, and automotive-grade power management.
The MPQ2171 belongs to MPS's AEC-Q100-qualified monolithic buck converter family, designed specifically for space-constrained, thermally demanding automotive subsystems requiring high efficiency, fast transient response, and robust fault protection.
FAQ
Is MPQ2171GJ-AEC1-Z still recommended for new designs?
No - the official datasheet states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MPQ2177". MPQ2171GJ-AEC1-Z remains available for legacy production and repair, but MPQ2177 offers higher current (2A), improved efficiency, and extended input range (2.2V–5.5V) with full pin compatibility and enhanced EMI performance.
What is the function of the OUT pin, and why is it separate from FB?
The OUT pin provides direct sensing of the output voltage rail, feeding into an internal comparator that monitors regulation integrity independently of the FB divider network. This dual-sensing architecture improves load regulation accuracy and enables faster response to output disturbances, especially under dynamic load conditions common in automotive microcontrollers.
Can MPQ2171GJ-AEC1-Z operate with 100% duty cycle, and under what conditions?
Yes - it supports 100% duty cycle in dropout mode when VIN drops to within ~0.5V above VOUT. This occurs when the internal high-side switch remains continuously on, bypassing switching action to maintain regulation - critical for sustaining operation during automotive cold-crank events where input may dip to 3.0V while powering a 2.8V rail.
How does the soft-stop feature work, and what design precautions are required?
When disabled via EN, MPQ2171GJ-AEC1-Z linearly discharges the output capacitor by reversing energy flow into VIN. If output capacitance (C2) is large and input capacitance (C1) is small, VIN can rise above its 6V absolute maximum rating. Designers must satisfy C2 < 36×C1×(VIN−VOUT)² to avoid overvoltage - or avoid EN-based shutdown entirely in high-C2 systems.
What is the purpose of separating PGND and AGND, and how should they be connected?
PGND carries high di/dt switching currents; AGND references precision analog circuits (error amp, reference). They must be kept separate on the PCB except at a single-point star connection near the IC's ground pins to prevent noise coupling. Failure to isolate AGND from PGND return paths degrades feedback accuracy and can cause instability or false PG assertions.
Does MPQ2171GJ-AEC1-Z require external compensation components?
No - its constant-on-time (COT) control architecture eliminates the need for external Type-II or Type-III compensation networks. Stability is inherently achieved through input-voltage feed-forward and fixed on-time modulation, simplifying design and reducing component count - verified across 0.6V–3.3V outputs with standard ceramic output capacitors.
What is the significance of the "AEC1" suffix in the part number?
The "AEC1" denotes AEC-Q100 Grade 1 qualification, certifying operation over −40°C to +125°C junction temperature with full reliability testing (HTOL, TC, ESD, etc.). It is not a package variant - MPQ2171GJ-AEC1-Z and MPQ2171GJ share identical TSOT23-8 packaging and electrical specs, differing only in qualification scope and traceability documentation.
MPQ2171GJ-AEC1-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-AEC1-Z FAQ
1.How can I place an order for MPQ2171GJ-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2171GJ-AEC1-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-AEC1-Z reliable?
The price and inventory of MPQ2171GJ-AEC1-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-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ2171GJ-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2171GJ-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2171GJ-AEC1-Z?
MPQ2171GJ-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2171GJ-AEC1-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-AEC1-Z?
For technical support, including MPQ2171GJ-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2171GJ-AEC1-Z requirements.
6.How does Aetrix verify that MPQ2171GJ-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2171GJ-AEC1-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-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ2171GJ-AEC1-Z?
All MPQ2171GJ-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2171GJ-AEC1-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-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ2171GJ-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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