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Texas Instruments TPS61085ATDGKTQ1
- Part No.:
- TPS61085ATDGKTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS61085ATDGKTQ1.pdf
- Description:
- IC REG BOOST ADJ 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,687
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Product details
Overview
TPS61085ATDGKTQ1 from Texas Instruments is an AEC-Q100 Grade 2 automotive-qualified, high-efficiency DC/DC boost converter with integrated 2-A, 0.13-Ω N-channel MOSFET switch, 2.3 V to 6 V input range, 18.5 V maximum output voltage, and selectable 650 kHz or 1.2 MHz switching frequency. It delivers up to 300 mA at 12 V in typical automotive infotainment power rails.
For engineers reviewing the TPS61085ATDGKTQ1 datasheet, TPS61085ATDGKTQ1 pinout, TPS61085ATDGKTQ1 application, or TPS61085ATDGKTQ1 equivalent, key selection criteria include its adjustable soft-start via external capacitor, external compensation for stability optimization, thermal shutdown (150°C), undervoltage lockout (2.3 V), and VSSOP-8 package compatibility with space-constrained automotive PCB layouts.
Technical Context
The TPS61085ATDGKTQ1 operates in current-mode control with quasi-constant frequency and adaptive OFF-time for superior line and load transient response. Its external compensation network (COMP pin) enables precise loop tuning across varying output voltages and inductor values.
Switching frequency is selected via FREQ pin logic level: grounded for 650 kHz (higher efficiency, larger inductors) or tied to IN for 1.2 MHz (faster transients, smaller magnetics). Soft-start is implemented by charging an external capacitor on SS pin at 10 µA, ramping peak switch current from 0 A to full 2-A limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3 V to 6 V - supports wide automotive battery range including cold-crank (≥2.3 V) and post-ignition (≤6 V) |
| Max Output Voltage | 18.5 V - powers audio amplifiers, display bias, and sensor excitation requiring >12 V rails |
| Switch Current Limit | 2 A min - enables ≥300 mA at 12 V output with margin for transient loads |
| Switching Frequency | Selectable 650 kHz or 1.2 MHz - allows trade-off between efficiency (650 kHz) and component size/transient response (1.2 MHz) |
| Feedback Reference | 1.238 V ±0.8% - sets output voltage accuracy via resistor divider (e.g., R1 = 158 kΩ, R2 = 18.2 kΩ for 12 V) |
| Quiescent Current | 70–100 µA - minimizes standby power draw in always-on automotive modules |
| Thermal Shutdown | 150°C with 14°C hysteresis - protects against sustained overload or poor heatsinking in enclosed ECUs |
Pinout & Package
TPS61085ATDGKTQ1 uses an 8-pin VSSOP (DGK) package, 3.00 mm × 3.00 mm body size, with exposed thermal pad (not electrically connected). Pin pitch is 0.65 mm; recommended solder profile per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Compensation node | Output of internal transconductance error amplifier; connects to RC network for loop stability tuning |
| 2 - FB | Feedback input | Senses output voltage via resistor divider; regulates output to 1.238 V reference |
| 3 - EN | Enable control | Active-high logic input; tie to IN or microcontroller GPIO to power-cycle converter |
| 4 - PGND | Power ground | High-current return path for switch and input capacitor; must be low-inductance plane |
| 5 - SW | Switch node | Drives external Schottky diode (e.g., PMEG2010AEH); carries pulsed 2-A peak current |
| 6 - IN | Input supply | Accepts 2.3–6 V; requires local 1-µF ceramic bypass + bulk 10-µF input capacitance |
| 7 - FREQ | Frequency select | GND = 650 kHz; connect to IN = 1.2 MHz - no pull-up/down required |
| 8 - SS | Soft-start control | Connects to external capacitor (e.g., 100 nF) to linearly ramp current limit and suppress inrush |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualification | Rated for –40°C to +105°C ambient operation - validated for instrument clusters and body control modules |
| Adjustable soft-start | External capacitor on SS pin controls startup current ramp rate - prevents input rail collapse during ECU power-up |
| External compensation | COMP pin allows full loop gain/phase tuning - accommodates diverse output capacitors, inductors, and load profiles |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and resumes at ~136°C - avoids thermal cycling in thermally constrained enclosures |
| Undervoltage lockout (UVLO) | Disables operation below 2.3 V input - prevents erratic behavior during battery brownout or cranking |
Applications
| Automotive Infotainment Cluster | Automotive Body Control Module |
|---|---|
Use Scenario: Powering LCD display bias and audio amplifier rails in digital instrument clusters. IC Role / Device Role / Timing Role: Boost converter generating stable 12 V or 15 V from 3.3 V or 5 V domain supplies. Use Value: Delivers 300 mA at 12 V with <0.11%/A load regulation - maintains display contrast and audio fidelity across vehicle load conditions. |
Use Scenario: Supplying 9 V to solenoid drivers and CAN transceivers in door module ECUs. IC Role / Device Role / Timing Role: High-reliability step-up regulator enabling single-supply architecture from 3.3 V microcontroller domain. Use Value: AEC-Q100 qualification and 150°C thermal shutdown ensure robustness in hot under-dash environments. |
| Telematics E-Call System | ADAS Camera Power Rail |
Use Scenario: Providing backup 12 V rail for GPS/GSM modem during main battery failure. IC Role / Device Role / Timing Role: Always-on boost stage activated by microcontroller upon ignition-off detection. Use Value: 1 µA shutdown current and 70 µA quiescent current extend backup battery life beyond 72 hours. |
Use Scenario: Generating 15 V for image sensor analog front-end and lens actuator in rear-view cameras. IC Role / Device Role / Timing Role: Low-noise, fast-transient boost source synchronized to camera frame timing. Use Value: 1.2 MHz switching enables <100 ns load-step response - eliminates image artifacts during rapid illumination changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Non-automotive grade (commercial), same 2-A switch, but higher 12-V max output; lacks AEC-Q100 qualification and UVLO hysteresis | Not suitable for safety-critical or under-hood automotive use; acceptable for industrial or consumer portable devices | Select only if AEC-Q100 compliance is unnecessary and cost is primary driver |
| LM3478MMX/NOPB | External MOSFET controller (no integrated switch), wider 2.5–40 V input, but requires discrete 2-A FET and gate driver design | Offers higher flexibility for custom thermal/power layout but increases BOM count and design validation effort | Prefer when >18.5 V output or >2-A continuous current is needed, or when thermal separation is critical |
Compared with TPS61085ATDGKTQ1, TPS61088RHLR provides identical boost functionality without automotive qualification or thermal/UVLO safeguards, while LM3478MMX/NOPB shifts complexity to external components but enables higher voltage/current scalability.
Availability
TPS61085ATDGKTQ1 is available at Aetrix Electronics and suitable for automotive infotainment cluster, telematics E-call, and ADAS camera power applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for TPS61085ATDGKTQ1 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 leader specializing in analog, embedded processing, and automotive-grade power management ICs, with decades of automotive qualification expertise.
The TPS61085A-Q1 belongs to TI's automotive-qualified boost converter product line, designed specifically for reliable, high-efficiency voltage step-up in harsh-temperature, safety-critical vehicle subsystems.
FAQ
What is the maximum output current capability of the TPS61085ATDGKTQ1 at 12 V output?
The TPS61085ATDGKTQ1 delivers up to 300 mA at 12 V output when operating from a 3.3 V input at 1.2 MHz with typical efficiency (~90%). This assumes proper thermal design, 6.8-µH inductor (for 650 kHz) or 3.3-µH (for 1.2 MHz), and adequate input/output capacitance. Peak switch current remains within the 2-A minimum limit under these conditions.
How does the FREQ pin selection affect efficiency and component size in TPS61085ATDGKTQ1 designs?
Setting FREQ = GND selects 650 kHz operation, yielding higher efficiency (e.g., ~92% at 300 mA) and permitting larger, lower-DCR inductors (e.g., 6.8 µH). Setting FREQ = IN selects 1.2 MHz, reducing inductor size (e.g., 3.3 µH) and output ripple but lowering peak efficiency by ~1–2% due to increased switching losses - ideal for space-constrained layouts.
Can the TPS61085ATDGKTQ1 be used with ceramic output capacitors only, and what is the recommended value?
Yes, the TPS61085ATDGKTQ1 is optimized for low-ESR ceramic output capacitors. TI recommends two 10-µF/25-V X7R/X5R ceramics (e.g., Taiyo Yuden TMK316BJ106KL) in parallel, or one 22-µF unit. Total effective capacitance must remain ≥20 µF after DC bias derating to ensure stable regulation and ≤100-mV load transient deviation.
What is the purpose of the SS (soft-start) pin on the TPS61085ATDGKTQ1, and how is it configured?
The SS pin on the TPS61085ATDGKTQ1 controls inrush current during startup by linearly ramping the internal current limit from 0 A to full 2-A over time. A capacitor (e.g., 100 nF) is connected from SS to GND; charging at 10 µA sets soft-start duration. Open-circuit disables soft-start. The pin discharges to GND when EN is low.
Does the TPS61085ATDGKTQ1 require an external Schottky diode, and what are the key selection criteria?
Yes, the TPS61085ATDGKTQ1 requires an external Schottky diode (e.g., PMEG2010AEH). Key criteria: reverse voltage rating >18.5 V, average forward current ≥ output current (e.g., ≥300 mA), forward voltage <0.5 V at rated current, and SOD-123 or similar low-inductance package. Diode power dissipation must be verified per PD = IOUT × VF.
TPS61085ATDGKTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- 18.5V
- Current - Output:
- -
- Frequency - Switching:
- 650kHz, 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS61085ATDGKTQ1 FAQ
1.How can I place an order for TPS61085ATDGKTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61085ATDGKTQ1 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 TPS61085ATDGKTQ1 reliable?
The price and inventory of TPS61085ATDGKTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61085ATDGKTQ1 is usually 5 days.
3.What payment methods are accepted for TPS61085ATDGKTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61085ATDGKTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61085ATDGKTQ1?
TPS61085ATDGKTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61085ATDGKTQ1 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 TPS61085ATDGKTQ1?
For technical support, including TPS61085ATDGKTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61085ATDGKTQ1 requirements.
6.How does Aetrix verify that TPS61085ATDGKTQ1 is sourced from the original manufacturer or authorized distributors?
All TPS61085ATDGKTQ1 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 TPS61085ATDGKTQ1 meets industry standards.
7.What is the process for return or replacement of TPS61085ATDGKTQ1?
All TPS61085ATDGKTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS61085ATDGKTQ1, 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 TPS61085ATDGKTQ1 part is unused and in its original packaging.
Return procedure for TPS61085ATDGKTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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