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Texas Instruments TPS61085TDGKRQ1
- Part No.:
- TPS61085TDGKRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS61085TDGKRQ1.pdf
- Description:
- IC REG BOOST ADJ 2A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,630
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Product details
Overview
TPS61085TDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 2 automotive-qualified, 2.3 V to 6 V input, 18.5 V output boost DC/DC converter with integrated 2-A, 0.13-Ω N-channel MOSFET switch, selectable 650 kHz or 1.2 MHz switching frequency, and adjustable soft-start via external capacitor. It delivers up to 600 mA at 12 V in typical automotive infotainment power rails.
For engineers reviewing the TPS61085TDGKRQ1 datasheet, TPS61085TDGKRQ1 pinout, TPS61085TDGKRQ1 application, or TPS61085TDGKRQ1 equivalent, key selection factors include its automotive-grade thermal shutdown (150°C), undervoltage lockout (2.3 V), external compensation flexibility, and VSSOP-8 package compatibility with space-constrained body control modules and ADAS subsystems.
Technical Context
The TPS61085TDGKRQ1 operates in current-mode control with quasi-constant frequency and adaptive OFF-time for superior line and load transient response. Its externally compensated transconductance error amplifier (gm = 107 µA/V) enables stability optimization across varying output voltages (up to 18.5 V) and load conditions.
Switching frequency selection (650 kHz or 1.2 MHz) is controlled by the FREQ pin logic level, directly impacting inductor size, efficiency trade-offs, and ripple performance. The device transitions between CCM, DCM, and pulse-skipping modes depending on load current to maintain regulation while minimizing quiescent current (70 µA typical).
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) conditions |
| Output Voltage Range | Up to 18.5 V - configurable via external resistor divider (e.g., R1 = 158 kΩ, R2 = 18.2 kΩ for 12 V) |
| Switch Current Limit | 2 A minimum peak - enables ≥600 mA output at 12 V with >90% efficiency using 3.3 µH inductor |
| Switching Frequency | Selectable 650 kHz or 1.2 MHz - determines inductor size (6.8 µH vs. 3.3 µH) and light-load efficiency vs. transient response trade-off |
| Feedback Reference Voltage | 1.238 V ±0.008 V - high-accuracy reference enabling <±1% output voltage tolerance with proper resistor selection |
| Quiescent Current | 70 µA typical - ensures low standby power draw in always-on automotive modules |
| Thermal Shutdown | 150°C junction temperature - protects against sustained overload or poor PCB thermal design |
Pinout & Package
TPS61085TDGKRQ1 is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size) with exposed thermal pad for enhanced heat dissipation in automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Compensation node | Output of internal transconductance error amplifier; connects to RC network (e.g., 47 kΩ + 1.6 nF) 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; pulls high to enable operation, low to enter 1 µA shutdown mode |
| 4 - PGND | Power ground | High-current return path for switch and input capacitor; must be routed separately from signal ground |
| 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 input; requires local 1 µF ceramic bypass and bulk 10 µF input capacitance |
| 7 - FREQ | Frequency select | Logic-level input: connect to GND for 650 kHz, to IN for 1.2 MHz switching |
| 8 - SS | Soft-start control | Connects to external capacitor (e.g., 100 nF) to ramp current limit and limit inrush during startup |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualification | Rated for –40°C to +105°C ambient operation - validated for instrument clusters, head units, and telematics modules |
| Adjustable soft-start | Capacitor-controlled ramp of peak switch current from 0 A to full limit - prevents inrush into large output capacitors (e.g., 2 × 10 µF) |
| External compensation | Full control over loop bandwidth and phase margin - enables optimization for 9 V, 12 V, or 15 V outputs with varying load dynamics |
| Integrated 0.13-Ω MOSFET | Low RDS(on) reduces conduction loss - achieves >90% efficiency at 300–600 mA loads with 3.3 µH inductor |
| Overvoltage protection | FB pin overvoltage detection (>1.275 V) disables switching - safeguards downstream 12 V audio amplifiers or ADAS sensors |
Applications
| Automotive Infotainment Cluster | Automotive Body Control Module |
|---|---|
Use Scenario: Powering LCD backlight drivers and audio amplifier bias rails in digital instrument clusters. IC Role / Device Role / Timing Role: Primary 12 V boost regulator supplying stable rail from 3.3 V microcontroller domain. Use Value: Delivers 600 mA at 12 V with <1% output variation across –40°C to +105°C, meeting ASIL-B functional safety margins. |
Use Scenario: Generating 9 V supply for CAN transceiver and sensor interface ICs in door module ECUs. IC Role / Device Role / Timing Role: Secondary boost stage stepping up 3.3 V MCU rail to isolated 9 V analog domain. Use Value: 650 kHz operation minimizes EMI in proximity to LIN bus; soft-start prevents reset glitches during wake-up. |
| Telematics Emergency Call (E-Call) | ADAS Camera Power Supply |
Use Scenario: Providing regulated 12 V to GSM/LTE modem and GPS receiver in emergency call systems. IC Role / Device Role / Timing Role: Always-on boost converter maintaining communication capability during vehicle battery brownouts. Use Value: UVLO threshold of 2.3 V ensures operation down to cold-crank conditions; 1 µA shutdown current preserves battery life. |
Use Scenario: Supplying 15 V to image sensor bias circuitry and ISP in rear-view camera modules. IC Role / Device Role / Timing Role: High-accuracy boost regulator delivering precise 15 V from 3.3 V domain with minimal ripple. Use Value: 1.238 V feedback reference and external compensation enable <±0.5% output accuracy critical for sensor SNR. |
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 temp), higher 3.5-A switch current, same 8-pin VQFN package | Lacks AEC-Q100 qualification and thermal shutdown hysteresis; unsuitable for under-hood or safety-critical use | Use only in non-automotive industrial or consumer designs requiring >600 mA at 12 V |
| LM3478QMMX/NOPB | External MOSFET controller (no integrated switch), wider 2.5–40 V input, 1.25-MHz fixed frequency | Requires external high-side N-FET and gate driver; higher BOM count but supports >20 V outputs | Select when output >18.5 V or >2 A load required; not a drop-in replacement |
Compared with TPS61085TDGKRQ1, TPS61088RHLR offers higher current but no automotive qualification, while LM3478QMMX/NOPB provides greater output voltage flexibility at the cost of added external components and layout complexity - neither matches the integrated, AEC-Q100-compliant 2-A boost solution of the TPS61085TDGKRQ1.
Availability
TPS61085TDGKRQ1 is available at Aetrix Electronics and suitable for automotive infotainment cluster, body control module, and telematics emergency call (E-call) applications requiring stable component supply with full AEC-Q100 compliance and long-term production support.
Supply support for TPS61085TDGKRQ1 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 and embedded processing technologies, with decades of automotive IC design expertise and rigorous qualification processes.
The TPS61085TDGKRQ1 belongs to TI's automotive-qualified boost converter product line, engineered specifically for reliable, high-efficiency power conversion in infotainment, body electronics, and ADAS subsystems operating across extended temperature ranges.
FAQ
What is the maximum output voltage supported by the TPS61085TDGKRQ1?
The TPS61085TDGKRQ1 supports a maximum output voltage of 18.5 V, as specified in its absolute maximum ratings and confirmed across all operating conditions in the datasheet. This limit is enforced by internal overvoltage protection that disables switching if the FB pin voltage exceeds ~1.275 V, corresponding to 18.5 V with standard resistor divider ratios. Output voltages above this value risk permanent damage and are not supported.
Does the TPS61085TDGKRQ1 require external compensation components?
Yes, the TPS61085TDGKRQ1 requires external compensation components connected to the COMP pin to ensure stable closed-loop operation. The device uses an external transconductance error amplifier configuration, where resistor and capacitor values (e.g., 47 kΩ and 1.6 nF for 12 V/1.2 MHz) must be selected based on output voltage, inductor value, and load requirements per TI's Application Report SLVSE63B.
How does the FREQ pin affect switching frequency in the TPS61085TDGKRQ1?
The FREQ pin on the TPS61085TDGKRQ1 selects between two discrete switching frequencies: connecting FREQ to GND sets 650 kHz operation, while connecting it to IN selects 1.2 MHz. This choice directly impacts inductor size (6.8 µH vs. 3.3 µH), light-load efficiency, and transient response speed - with 1.2 MHz offering faster response but slightly lower efficiency at medium loads.
What is the purpose of the SS (soft-start) pin on the TPS61085TDGKRQ1?
The SS pin on the TPS61085TDGKRQ1 controls inrush current during startup by allowing an external capacitor (e.g., 100 nF) to ramp the internal current limit from 0 A to the full 2-A peak. When EN is asserted, the SS pin charges at ~10 µA, linearly increasing the switch current limit until the output reaches 90% of target - preventing voltage droop and system resets in capacitive loads like LCD backlights.
Is the TPS61085TDGKRQ1 pin-compatible with the commercial-grade TPS61085DRCT?
No, the TPS61085TDGKRQ1 is not pin-compatible with the commercial TPS61085DRCT. While both share the same VSSOP-8 package footprint, the TPS61085TDGKRQ1 is the automotive-qualified variant with different internal protection thresholds (e.g., tighter UVLO hysteresis, enhanced ESD rating), qualified test flow, and part marking. Electrical behavior and thermal limits differ, making direct substitution unsafe without full requalification.
TPS61085TDGKRQ1 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:
- Obsolete
- 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:
- 2A (Switch)
- Frequency - Switching:
- 650kHz, 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS61085TDGKRQ1 FAQ
1.How can I place an order for TPS61085TDGKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61085TDGKRQ1 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 TPS61085TDGKRQ1 reliable?
The price and inventory of TPS61085TDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61085TDGKRQ1 is usually 5 days.
3.What payment methods are accepted for TPS61085TDGKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61085TDGKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61085TDGKRQ1?
TPS61085TDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61085TDGKRQ1 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 TPS61085TDGKRQ1?
For technical support, including TPS61085TDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61085TDGKRQ1 requirements.
6.How does Aetrix verify that TPS61085TDGKRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS61085TDGKRQ1 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 TPS61085TDGKRQ1 meets industry standards.
7.What is the process for return or replacement of TPS61085TDGKRQ1?
All TPS61085TDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS61085TDGKRQ1, 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 TPS61085TDGKRQ1 part is unused and in its original packaging.
Return procedure for TPS61085TDGKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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