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Monolithic Power Systems Inc. MP2171GJ-P
- Part No.:
- MP2171GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2171GJ-P.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,343
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Product details
Overview
MP2171GJ-P 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 and portable instrument power rails.
For engineers reviewing the MP2171GJ-P datasheet, MP2171GJ-P pinout, MP2171GJ-P application, or MP2171GJ-P equivalent, key selection criteria include its TSOT23-8 package footprint, integrated power switches, PG and EN functionality for sequencing, thermal shutdown at 170°C, and ±10% power-good window referenced to 0.6V feedback voltage.
Technical Context
The MP2171GJ-P uses constant-on-time (COT) control with input-voltage feed-forward to maintain stable switching frequency across input (2.5V–5.5V) and output (0.6V–VIN−0.5V) ranges, enabling predictable loop behavior without external compensation. Its internal 90mΩ/50mΩ MOSFET pair supports high-efficiency operation up to 1A with minimal external components.
It integrates cycle-by-cycle over-current protection (4A HS-FET limit), hiccup-mode short-circuit protection, auto-discharge during shutdown, and a dedicated open-drain PG pin with 500kΩ internal pull-up - all coordinated via separate AGND and PGND pins to isolate analog sensing from power return paths.
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 (e.g., 0.6V for low-power MCU cores) and I/O rails (1.2V, 1.8V, 3.3V). |
| Max Output Current | 1A continuous - sufficient for SoC I/O domains, display drivers, and sensor hubs in compact systems. |
| Switching Frequency | 2.6MHz typical (VIN=3.3V, VOUT=1.8V) - allows use of sub-1µH inductors and reduces output capacitor size. |
| Feedback Voltage | 600mV ±12mV - sets regulation point; enables precise output scaling via external resistor divider (e.g., 41.2kΩ/41.2kΩ for 1.2V). |
| Power Good Threshold | ±10% window around 0.6V (i.e., 540–660mV) - provides reliable rail monitoring for system reset or sequencing control. |
| Thermal Shutdown | 170°C with 30°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-off. |
| Quiescent Current | 720µA typical - balances light-load efficiency and startup speed in always-on subsystems. |
Pinout & Package
MP2171GJ-P 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 (PGND-connected) and strict pin spacing per JEDEC MO-193BA.
| 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 to ground otherwise - enables safe system boot sequencing. |
| 2 - VIN | Main input supply | Accepts 2.5V–5.5V; requires local 10µF ceramic decoupling close to pin to suppress switching noise and stabilize input impedance. |
| 3 - SW | Switch node | Drives external inductor; carries high di/dt; must be routed short and away from sensitive analog traces (FB, AGND) to avoid coupling. |
| 4 - PGND | Power ground reference | Return path for high-current MOSFETs and inductor; requires solid copper pour and multiple vias to minimize voltage bounce and EMI. |
| 5 - OUT | Output voltage sense | Direct connection to regulated output rail; used internally for line/load regulation and soft-stop discharge control. |
| 6 - AGND | Analog ground reference | Reference for feedback comparator, error amplifier, and PG circuitry; must be isolated from PGND except at single-point star ground. |
| 7 - FB | Feedback input | Connects to resistor divider tap; senses scaled output voltage; high-impedance (10nA bias) for minimal divider loading. |
| 8 - EN | Enable control | Logic-high (>1.2V) enables regulator; floating or grounded disables it; includes 1MΩ internal pulldown for default-off behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 90mΩ/50mΩ MOSFETs | Eliminates need for external power switches and gate drivers - reduces BOM count and layout complexity in ultra-compact designs. |
| Constant-on-time (COT) control | Delivers <10µs load transient response without external compensation components - critical for FPGA or processor core rail stability. |
| 100% duty-cycle operation | Enables dropout mode at ultra-low input voltages (e.g., 1.8V out from 1.85V in), extending battery runtime in brownout conditions. |
| Auto-discharge at shutdown | Actively discharges output capacitor through internal path when EN is low - prevents residual voltage from interfering with downstream logic states. |
| Hiccup-mode short-circuit protection | Disables switching, discharges soft-start cap, then retries - limits average power dissipation during fault and avoids thermal runaway. |
| Stable with ceramic output capacitors | Supports low-ESR X5R/X7R MLCCs (e.g., 22µF) without requiring tantalum or electrolytic types - improves reliability and temperature range. |
Applications
| Automotive Infotainment | Portable Instrument Power |
|---|---|
|
Use Scenario: Powering DSP, audio codec, and touch controller in head-unit systems operating from 5V or 3.3V vehicle bus rails. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V step-down regulator supplying digital subsystems with tight voltage tolerance and fast load-step response. Use Value: 2.6MHz switching enables small 1µH inductor and 22µF ceramic output cap - meeting AEC-Q200-compatible layout constraints in confined dash-space. |
Use Scenario: Supplying microcontroller, OLED display, and environmental sensors in handheld test meters powered by single Li-ion cell. IC Role / Device Role / Timing Role: Main buck converter delivering regulated 3.3V or 1.8V from 3.0–4.2V battery, with EN-controlled sleep/wake sequencing. Use Value: 720µA quiescent current and 100% duty-cycle capability extend usable battery life near end-of-discharge while maintaining rail integrity. |
| Automotive Cluster Display | Low-Voltage I/O System Power |
|
Use Scenario: Generating 1.2V core and 1.8V I/O supplies for cluster MCU and graphics processor in digital instrument clusters. IC Role / Device Role / Timing Role: Dual-rail support via parallel MP2171GJ-P instances; PG signals coordinate safe boot order between logic and interface domains. Use Value: ±10% PG window and thermal shutdown at 170°C ensure functional safety compliance under extended high-temperature cabin operation. |
Use Scenario: Providing clean, sequenced 1.2V/1.8V rails for FPGA I/O banks, ADC references, and level-shifted communication interfaces. IC Role / Device Role / Timing Role: Point-of-load regulator with independent EN and PG pins enabling precise power-up/down timing relative to host controller. Use Value: Separate AGND/PGND pins and COT architecture minimize ground bounce and output ripple (<20mV p-p typical), preserving signal integrity. |
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 |
|---|---|---|---|
| TPS6286518RQYR | Higher 3MHz default frequency; lower 300µA IQ; requires external compensation; no integrated PG. | Lacks power-good signaling and hiccup-mode SCP - unsuitable where rail monitoring or robust fault recovery is required. | Select when ultra-low quiescent current and higher switching frequency outweigh need for integrated PG and fault resilience. |
| RT7297BZSP | Fixed 1.2V output; no adjustable FB; 2A rating; larger SOT-23-6 package; no PG or soft-stop. | Non-adjustable output and missing sequencing features limit use to fixed-rail, non-sequenced applications only. | Choose only for cost-sensitive, single-rail 1.2V applications where flexibility and system-level control are not needed. |
Compared with TPS6286518RQYR and RT7297BZSP, MP2171GJ-P uniquely combines adjustable 0.6V–VIN−0.5V output, integrated PG/EN sequencing, hiccup-mode SCP, and TSOT23-8 footprint - making it optimal for compact, multi-rail automotive and portable systems requiring full fault visibility and controlled power delivery.
Availability
MP2171GJ-P is available at Aetrix Electronics and suitable for automotive infotainment, portable instrumentation, and low-voltage I/O system power requiring stable component supply, AEC-Q200-aligned thermal performance, and long-term production continuity.
Supply support for MP2171GJ-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 power ICs, with design centers in the US, China, and Taiwan, 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 integration, efficiency, and reliability are critical.
FAQ
What is the minimum recommended output capacitor value for stable operation?
The MP2171GJ-P is stable with ≥22µF X5R/X7R ceramic output capacitors. Lower values (e.g., 10µF) may cause instability under heavy load transients due to insufficient energy storage and phase margin degradation - verified in typical application circuits with 1µH inductors and 3.3V/1.8V outputs.
Does MP2171GJ-P support forced PWM or skip-mode operation?
No - MP2171GJ-P uses fixed constant-on-time (COT) control without selectable modes. It inherently transitions between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) based on load, but does not implement pulse-skipping or forced-PWM; light-load efficiency is maintained via low quiescent current (720µA).
How is the soft-start time determined, and can it be adjusted externally?
Soft-start time is fixed at ~1.3ms (typical) and internally controlled via a ramped reference voltage - no external capacitor or resistor adjusts it. This ensures consistent startup behavior across temperature and input voltage without adding components or layout sensitivity.
What is the maximum allowable voltage on the SW pin during startup or fault conditions?
The SW pin tolerates −0.3V (steady-state) or −5V for <10ns pulses, and up to VIN + 0.3V (or 8V for <10ns). Exceeding these limits risks gate oxide damage; proper snubbing and layout (short SW trace, minimized loop area) are essential to contain ringing within spec.
Can MP2171GJ-P operate with an input voltage below 2.5V?
No - the absolute minimum operating input is 2.5V per datasheet specifications. Below this, UVLO prevents enablement; the device remains latched off until VIN exceeds 2.2V (rising threshold), and will not regulate output even if EN is asserted.
Is the PG pin compatible with 1.8V logic systems without a level shifter?
Yes - PG is open-drain with internal 500kΩ pull-up to VIN. When VIN = 3.3V, PG pulls up to ~3.3V; when VIN = 1.8V, it pulls up to ~1.8V. For 1.8V logic, connect PG directly to a 1.8V-tolerant GPIO with internal or external pull-down - no level shifter needed.
What is the thermal resistance (θJA) of the TSOT23-8 package under standard JEDEC 4-layer PCB conditions?
θJA is 100°C/W when measured per JESD51-7 on a 4-layer PCB with 2oz copper, 1-in² thermal pad connected to internal ground planes via ≥4 vias. Actual board-level θJA depends on copper area, via count, and airflow - derate power dissipation accordingly for ambient >25°C.
MP2171GJ-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):
- 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-P FAQ
1.How can I place an order for MP2171GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2171GJ-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 MP2171GJ-P reliable?
The price and inventory of MP2171GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2171GJ-P is usually 5 days.
3.What payment methods are accepted for MP2171GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2171GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2171GJ-P?
MP2171GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2171GJ-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 MP2171GJ-P?
For technical support, including MP2171GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2171GJ-P requirements.
6.How does Aetrix verify that MP2171GJ-P is sourced from the original manufacturer or authorized distributors?
All MP2171GJ-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 MP2171GJ-P meets industry standards.
7.What is the process for return or replacement of MP2171GJ-P?
All MP2171GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2171GJ-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 MP2171GJ-P part is unused and in its original packaging.
Return procedure for MP2171GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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