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Texas Instruments TPS61085DGKT
- Part No.:
- TPS61085DGKT
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS61085DGKT.pdf
- Description:
- IC REG BOOST ADJ 2A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,655
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Product details
Overview
TPS61085DGKT from Texas Instruments is a high-efficiency, current-mode boost DC-DC converter with integrated 2.0-A/0.13-Ω N-channel MOSFET, supporting 2.3 V to 6 V input and up to 18.5 V output. It features selectable 650 kHz or 1.2 MHz switching frequency, adjustable soft-start via external capacitor, and operates in CCM/DCM/pulse-skipping modes for portable TFT LCD bias, GPS receivers, and DSL modem power rails.
For engineers reviewing the TPS61085DGKT datasheet, TPS61085DGKT pinout, TPS61085DGKT application, or TPS61085DGKT equivalent, key selection criteria include its 2.0-A switch current limit, 1.238-V feedback reference, external compensation flexibility, thermal shutdown at 150°C, and VSSOP-8 package compatibility with space-constrained handheld designs.
Technical Context
The TPS61085DGKT implements quasi-constant-frequency current-mode control with adaptive off-time architecture, enabling superior line and load transient response. Its externally compensated transconductance error amplifier (gm = 107 μA/V) supports stability optimization across wide output voltage and load ranges.
Switching frequency is selected via FREQ pin logic level: GND sets 650 kHz (higher efficiency), while IN sets 1.2 MHz (smaller magnetics, faster transient response). The device enters pulse-skipping mode under light loads and transitions between CCM and DCM based on inductor current ripple relative to average current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3 V to 6 V - supports single-cell Li-ion, NiMH, or 3.3-V rail inputs without pre-regulation |
| Max Output Voltage | 18.5 V - enables TFT LCD bias generation and white LED strings requiring >12 V |
| Switch Current Limit | 2.0 A min - sustains peak inductor currents for 600-mA 12-V output at 3.3-V input with margin |
| Feedback Reference | 1.238 V ±0.008 V - precision reference for accurate output voltage setting via resistor divider |
| Quiescent Current | 70–100 μA - minimizes standby power loss in battery-powered GPS and camera applications |
| Thermal Shutdown | 150°C with 14°C hysteresis - protects against sustained overload or poor PCB thermal design |
| UVLO Threshold | 2.3 V rising - prevents erratic startup during battery sag or cold-temperature discharge |
Pinout & Package
TPS61085DGKT is housed in an 8-pin VSSOP (DGK) package measuring 3.0 mm × 3.0 mm × 1.1 mm, optimized for compact portable layouts with exposed thermal pad connection to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP | Transconductance amplifier output | Connects external RC network to set loop bandwidth and phase margin for stable regulation |
| EN | Enable control input | Logic-high (>2 V) enables converter; logic-low (<0.5 V) disables with 1-μA shutdown current |
| FB | Feedback node | Senses output voltage via resistor divider; regulates output to 1.238 V at this pin |
| FREQ | Frequency select input | GND = 650 kHz; connected to IN = 1.2 MHz - determines inductor size and efficiency trade-off |
| IN | Main power input | Accepts 2.3–6 V; requires local 1-μF ceramic bypass and bulk 10-μF input capacitance |
| PGND | Power ground | Low-impedance return path for switch current; must be routed separately from signal ground |
| SW | Switch node | Drives external Schottky diode (e.g., PMEG2010AEH); high dv/dt node requiring tight layout |
| SS | Soft-start control | Capacitor-connected pin ramps current limit from 0 A to full scale; 100-nF typical for ~10-ms ramp |
Key Features
| Feature | Design Value |
|---|---|
| Selectable switching frequency | 650 kHz or 1.2 MHz - enables trade-off between component size (1.2 MHz) and light-load efficiency (650 kHz) |
| Adjustable soft-start | External capacitor controls inrush current ramp time - prevents input rail collapse during startup |
| External compensation | RC network on COMP pin allows loop tuning for specific output capacitor ESR and load dynamics |
| Overvoltage protection | Shuts down if FB exceeds 1.275 V (3% above 1.238 V) - safeguards downstream circuits from output overvoltage |
| Thermal shutdown with hysteresis | 150°C trip / 136°C recovery - ensures safe operation under sustained overload without oscillation |
Applications
| TFT LCD Bias Supply | GPS Receiver Power |
|---|---|
Use Scenario: Generating dual-rail ±12 V or single-rail 15–18 V for active matrix LCD source/gate drivers in portable navigation devices. IC Role / Device Role / Timing Role: Primary boost regulator delivering regulated high-voltage bias from 3.3-V system rail. Use Value: Delivers 18.5-V output with 2.0-A switch current headroom, enabling fast display refresh rates without voltage droop during pixel charging. |
Use Scenario: Providing stable 3.3-V or 5-V supply to GPS baseband ICs and RF front-end modules in handheld asset trackers. IC Role / Device Role / Timing Role: Efficient step-up converter powering low-noise LNA and ADC stages from single-cell battery. Use Value: 70–100 μA quiescent current extends battery life; UVLO at 2.3 V prevents brownout-induced position drift during weak-signal acquisition. |
| Digital Still Camera Flash Driver | DSL Modem Line Interface |
Use Scenario: Charging high-voltage capacitors for xenon flash tubes or driving white LED arrays requiring >12 V in compact camera modules. IC Role / Device Role / Timing Role: High-current boost stage with fast transient response to support burst-mode flash charging. Use Value: 1.2-MHz option enables use of 3.3-μH inductors for minimal board area; pulse-skipping maintains regulation at standby current <100 μA. |
Use Scenario: Generating isolated 12–15 V bias for DSL line driver amplifiers and analog front-end components in residential gateways. IC Role / Device Role / Timing Role: Compact, thermally robust boost converter supplying line interface ICs from 3.3-V or 5-V system bus. Use Value: 189.3°C/W junction-to-ambient thermal resistance in VSSOP-8 allows reliable operation at 85°C ambient with 300-mA load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 4.5-A switch current, 13-V max output, 2.7–12-V input range; uses 3-mm × 3-mm QFN with thermal pad | Supports higher-power applications like 5-V USB OTG boost or 12-V PoE-powered peripherals | Choose TPS61088RHLR when >2-A output current or wider input range is required; not pin-compatible |
| MT3608EN | 2-A switch, fixed 1.2-MHz frequency, no FREQ/SS pins, internal compensation, SOT-23-6 package | Targeted at cost-sensitive, space-constrained applications where soft-start and frequency selection are unnecessary | Choose MT3608EN for simplified BOM and layout where external compensation and dual-frequency operation are not needed |
Compared with TPS61085DGKT, TPS61088RHLR delivers higher current but requires different layout and thermal management, while MT3608EN reduces design complexity at the expense of configurability and precision feedback control.
Availability
TPS61085DGKT is available at Aetrix Electronics and suitable for TFT LCD bias supply, GPS receiver power, and DSL modem line interface applications requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade traceability.
Supply support for TPS61085DGKT 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 power management technologies, with decades of expertise in high-reliability DC-DC conversion.
The TPS61085DGKT belongs to TI's high-frequency boost converter product line, engineered specifically for portable and battery-powered systems demanding high efficiency, small solution size, and robust protection features.
FAQ
What is the maximum output voltage supported by the TPS61085DGKT?
The TPS61085DGKT supports a maximum output voltage of 18.5 V, as specified in its absolute maximum ratings and validated across operating conditions. This capability enables direct use in TFT LCD bias generation and white LED driver applications without additional regulation stages. The actual achievable output depends on input voltage, load, and external component selection - for example, with 3.3-V input and 1.2-MHz switching, it reliably delivers 12 V at 600 mA.
How does the FREQ pin affect the performance of the TPS61085DGKT?
The FREQ pin on the TPS61085DGKT selects between two fixed switching frequencies: grounding FREQ sets 650 kHz (optimized for higher efficiency and lower EMI), while connecting FREQ to IN sets 1.2 MHz (enabling smaller inductors and faster transient response). Frequency selection directly impacts inductor size, output ripple, and light-load efficiency - 1.2 MHz allows use of 3.3-μH inductors, whereas 650 kHz requires 6.8-μH for comparable performance.
Can the TPS61085DGKT operate with a 2.5-V input supply?
Yes, the TPS61085DGKT supports input voltages from 2.3 V to 6 V, making it fully compatible with a 2.5-V supply. At this input level, the device maintains regulation up to its 18.5-V maximum output, provided the load current remains within limits defined by efficiency and thermal constraints. Undervoltage lockout activates only below 2.2 V, ensuring stable operation across the full 2.3–6 V range including 2.5-V battery mid-discharge points.
What is the purpose of the SS (soft-start) pin on the TPS61085DGKT?
The SS pin on the TPS61085DGKT controls inrush current during startup by ramping the internal current limit from 0 A to full scale using an external capacitor charged at ~10 μA. A typical 100-nF capacitor yields ~10-ms soft-start time, preventing input rail collapse and reducing stress on input capacitors and the power source. Leaving SS open disables soft-start, resulting in immediate full-current capability but higher peak inrush.
Does the TPS61085DGKT include overvoltage protection?
Yes, the TPS61085DGKT includes dedicated overvoltage protection that monitors the FB pin. If the feedback voltage exceeds approximately 1.275 V (3% above the 1.238-V reference), the device immediately halts switching to prevent output overvoltage. Switching resumes only after FB falls back to nominal regulation level. This feature safeguards connected displays, sensors, or RF circuitry from damage due to feedback divider failure or output capacitor fault.
TPS61085DGKT 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:
- 2A (Switch)
- Frequency - Switching:
- 650kHz, 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS61085DGKT FAQ
1.How can I place an order for TPS61085DGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61085DGKT 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 TPS61085DGKT reliable?
The price and inventory of TPS61085DGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61085DGKT is usually 5 days.
3.What payment methods are accepted for TPS61085DGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61085DGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61085DGKT?
TPS61085DGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61085DGKT 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 TPS61085DGKT?
For technical support, including TPS61085DGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61085DGKT requirements.
6.How does Aetrix verify that TPS61085DGKT is sourced from the original manufacturer or authorized distributors?
All TPS61085DGKT 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 TPS61085DGKT meets industry standards.
7.What is the process for return or replacement of TPS61085DGKT?
All TPS61085DGKT units undergo pre-shipment inspection (PSI). If there is an issue with TPS61085DGKT, 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 TPS61085DGKT part is unused and in its original packaging.
Return procedure for TPS61085DGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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