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Texas Instruments TPS62171DSGT
- Part No.:
- TPS62171DSGT
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
TPS62171DSGT.pdf
- Description:
- IC REG BUCK 1.8V 500MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:670
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Product details
Overview
TPS62171DSGT from Texas Instruments is a fixed-output 1.8 V, 500-mA synchronous step-down DC-DC converter with DCS-Control™ topology, operating from 3 V to 17 V input and delivering ±3% output voltage accuracy in a 2-mm × 2-mm WSON-8 package. It integrates power good (PG), undervoltage lockout, thermal shutdown, and seamless PWM-to-power-save mode transition for battery-powered embedded systems.
For engineers reviewing the TPS62171DSGT datasheet, TPS62171DSGT pinout, TPS62171DSGT application, or TPS62171DSGT equivalent, key selection criteria include its 1.8 V fixed output, 2.25 MHz switching frequency, 17 µA quiescent current, 8-pin WSON package with exposed thermal pad, and compatibility with low-ESR ceramic capacitors and 2.2 µH inductors.
Technical Context
The TPS62171DSGT implements DCS-Control™, combining fast AC response via direct output voltage sensing with stable DC regulation through an internal error amplifier and compensated control loop. Its fixed 1.8 V output eliminates external feedback resistors, reducing BOM count and improving thermal performance when FB is tied to AGND.
It supports 100% duty-cycle operation down to VIN ≈ VOUT + (IOUT × RDS(on_HS) + IOUT × RL), enabling extended battery runtime in Li-ion or 12-V rail applications. Power sequencing is enabled via EN and open-drain PG pins, with PG asserting high-impedance during shutdown, UVLO, or thermal fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 17 V - supports single/dual Li-ion batteries and standard 12-V intermediate rails without external pre-regulation. |
| Output Voltage | Fixed 1.8 V ±3% - eliminates need for external feedback divider; improves layout simplicity and thermal reliability. |
| Max Output Current | 500 mA continuous - sufficient for powering core logic, FPGAs, DSPs, and microcontrollers in space-constrained designs. |
| Switching Frequency | Typ. 2.25 MHz - enables use of compact 2.2 µH inductors and 10–22 µF ceramic output capacitors, minimizing solution footprint. |
| Quiescent Current | 17 µA typical - maintains high light-load efficiency in always-on or low-duty-cycle systems like IoT sensors. |
| Thermal Shutdown | 160°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design while ensuring automatic recovery. |
| Power Good Output | Open-drain PG with 92–98% rising threshold - provides reliable system-level power sequencing and fault indication with external pull-up. |
Pinout & Package
TPS62171DSGT is housed in a thermally enhanced 2-mm × 2-mm, 8-pin WSON package (DSG) with an exposed thermal pad that must be soldered to AGND for optimal thermal dissipation and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power ground return | Low-impedance path for high-frequency switch node current; must be connected to local power ground plane. |
| VIN (Pin 2) | Main input supply | Accepts 3–17 V; requires local 10 µF ceramic capacitor placed near pin for high-frequency decoupling. |
| EN (Pin 3) | Enable control input | Active-high logic; internal 400 kΩ pull-down ensures safe default-off state; supports rail sequencing. |
| AGND (Pin 4) | Analog ground reference | Reference for FB, VOS, and internal error amplifier; must be connected to PGND at single point near IC. |
| FB (Pin 5) | Feedback reference (fixed version) | Internally connected to 1.8 V divider; recommended to tie to AGND for improved thermal resistance and noise immunity. |
| VOS (Pin 6) | Output voltage sense | Direct connection to regulated output; enables accurate load regulation and fast transient response via DCS-Control™. |
| SW (Pin 7) | Switch node | Connects to inductor; carries high di/dt square wave; requires short, low-inductance trace to minimize EMI. |
| PG (Pin 8) | Power good indicator | Open-drain output; requires external pull-up resistor (e.g., 10 kΩ to 3.3 V); asserts high-impedance on fault. |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control™ topology | Combines fast AC transient response (via direct VOUT sensing) with stable DC regulation-enables <10 µs load-step recovery with <1% droop using 22 µF output capacitance. |
| Seamless power save mode | Automatic transition from 2.25 MHz PWM to variable-frequency PSM below ~100 mA load-maintains >85% efficiency from 100 µA to 500 mA without audible switching noise. |
| 100% duty-cycle operation | Enables regulation down to VIN ≈ 1.85 V at full load-extends usable battery life in single-cell Li-ion (2.7–4.2 V) and partially discharged systems. |
| Integrated protection | Includes undervoltage lockout (2.7 V ±180 mV), thermal shutdown (160°C), and cycle-by-cycle current limiting-eliminates need for external fault management circuitry. |
| Small solution size | Requires only 3 external components (inductor, input cap, output cap) for fixed-output configuration-reduces total footprint to <15 mm² including 2.2 µH shielded inductor. |
Applications
| Mobile PC Core Supply | Digital Still Camera Sensor Rail |
|---|---|
Use Scenario: Powers ARM-based application processors and DDR memory I/O in ultra-thin notebooks and 2-in-1 devices from a shared 12-V or dual-cell Li-ion source. IC Role / Device Role / Timing Role: Primary POL regulator delivering clean, tightly regulated 1.8 V at up to 500 mA with fast load-transient response to handle CPU burst activity. Use Value: DCS-Control™ achieves <15 µs recovery from 100 mA → 500 mA step with <25 mV droop, preventing processor brownouts during video encoding. | Use Scenario: Supplies image sensor analog and digital cores in DSLR and mirrorless cameras where low noise and rapid startup are critical. IC Role / Device Role / Timing Role: Fixed 1.8 V rail generator with soft-start (25 mV/µs ramp) and monotonic pre-biased startup to avoid sensor reset glitches. Use Value: 17 µA quiescent current minimizes standby drain; PG signal synchronizes sensor initialization sequence with system boot. |
| Industrial PLC I/O Module | Wireless Modem Baseband |
Use Scenario: Provides isolated 1.8 V logic supply for FPGA-configurable I/O banks in DIN-rail mounted programmable logic controllers operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Robust point-of-load converter with thermal shutdown (160°C), UVLO (2.7 V), and 61.8°C/W θJA enabling operation in sealed enclosures without forced air. Use Value: WSON-8 package with exposed thermal pad achieves <25°C junction rise at 500 mA in 4-layer PCB-meets EN 61000-6-2 immunity requirements. | Use Scenario: Powers baseband ASIC and RF transceiver digital sections in LTE/5G cellular modems powered by single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: High-efficiency buck converter supporting 100% duty cycle down to VIN = 1.85 V-maximizes talk time during battery discharge. Use Value: Maintains >90% efficiency at 200 mA and >85% at 10 mA, extending operational time in low-duty-cycle data transmission modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62160DRVR | Same 3–17 V input, but adjustable 0.8–6 V output; 1.2-MHz switching frequency; no PG pin; 12-µA IQ. | Lacks power good signaling and fixed 1.8 V option-requires external resistor divider and adds design complexity for identical output. | Select when adjustable output or lower quiescent current is prioritized over rail sequencing and BOM simplification. |
| TPS62825ADSGT | Pin-compatible successor with 2.4-MHz operation, 1.5-µA IQ, ±0.5% output accuracy, and integrated soft-start; same WSON-8 package. | Offers tighter regulation and lower IQ but requires updated layout for higher-frequency stability; not drop-in due to different compensation behavior. | Choose for new designs requiring highest accuracy and lowest standby power; verify loop stability with 2.2 µH inductor per TI SNVA782. |
Compared with TPS62171DSGT, TPS62160DRVR trades PG functionality and fixed output for lower IQ and adjustability, while TPS62825ADSGT delivers superior accuracy and efficiency in the same footprint but demands careful validation of high-frequency layout and control-loop response.
Availability
TPS62171DSGT is available at Aetrix Electronics and suitable for mobile PCs, digital still cameras, industrial PLC I/O modules, and wireless modems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS62171DSGT 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer applications.
The TPS6217x product line was designed for high-density, battery-sensitive applications requiring small-footprint, high-efficiency DC-DC conversion with robust protection and seamless light-load operation.
FAQ
What is the output voltage tolerance of the TPS62171DSGT under full load and temperature range?
The TPS62171DSGT delivers a fixed 1.8 V output with initial accuracy of ±3% across the full junction temperature range (–40°C to +125°C) and input voltage range (3 V to 17 V). This includes line and load regulation effects, and the specification holds at 500 mA output current in PWM mode with proper PCB layout and component selection.
Does the TPS62171DSGT require external feedback resistors to set its output voltage?
No, the TPS62171DSGT is a fixed-output variant with internal resistor divider configured for 1.8 V. The FB pin is internally connected and should be tied to AGND-not left floating-to improve thermal resistance and reduce noise coupling. External resistors are unnecessary and would disrupt regulation.
How does the TPS62171DSGT manage thermal performance in compact layouts?
The TPS62171DSGT uses a thermally enhanced WSON-8 package with an exposed pad that must be soldered to a dedicated AGND copper area. With proper PCB layout (≥200 mm² thermal pad copper, 4+ vias to inner ground planes), it achieves 15.5°C/W θJB, limiting junction rise to <25°C at 500 mA in a 4-layer board-enabling reliable operation without heatsinks.
Can the TPS62171DSGT start up into a pre-biased output voltage?
Yes, the TPS62171DSGT supports monotonic pre-biased startup. During this mode, the low-side MOSFET remains off until the internal soft-start ramp exceeds the existing output voltage, preventing reverse current flow and ensuring controlled voltage ramp-up without disrupting downstream circuitry.
What is the minimum input voltage required for the TPS62171DSGT to maintain 1.8 V regulation at full load?
At 500 mA load, the TPS62171DSGT maintains 1.8 V regulation down to approximately 1.85 V input in 100% duty-cycle mode. This value depends on high-side RDS(on) (~300 mΩ at VIN ≥6 V, ~430 mΩ at VIN = 3 V) and inductor DCR; actual minimum VIN is calculated as VOUT + IOUT × (RDS(on_HS) + RL).
TPS62171DSGT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- DCS-Control™
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
TPS62171DSGT FAQ
1.How can I place an order for TPS62171DSGT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62171DSGT 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 TPS62171DSGT reliable?
The price and inventory of TPS62171DSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62171DSGT is usually 5 days.
3.What payment methods are accepted for TPS62171DSGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62171DSGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62171DSGT?
TPS62171DSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62171DSGT 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 TPS62171DSGT?
For technical support, including TPS62171DSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62171DSGT requirements.
6.How does Aetrix verify that TPS62171DSGT is sourced from the original manufacturer or authorized distributors?
All TPS62171DSGT 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 TPS62171DSGT meets industry standards.
7.What is the process for return or replacement of TPS62171DSGT?
All TPS62171DSGT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62171DSGT, 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 TPS62171DSGT part is unused and in its original packaging.
Return procedure for TPS62171DSGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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