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Texas Instruments TPS61085DGKTG4
- Part No.:
- TPS61085DGKTG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS61085DGKTG4.pdf
- Description:
- IC REG BOOST ADJ 2A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,572
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Product details
Overview
TPS61085DGKTG4 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 TPS61085DGKTG4 datasheet, TPS61085DGKTG4 pinout, TPS61085DGKTG4 application, or TPS61085DGKTG4 equivalent, key selection criteria include input voltage range (2.3–6 V), peak switch current limit (2.0 A min), feedback reference voltage (1.238 V), thermal shutdown threshold (150 °C), and VSSOP-8 package compatibility with PCB layout constraints for handheld and space-constrained designs.
Technical Context
The TPS61085DGKTG4 implements quasi-constant-frequency current-mode control with adaptive off-time architecture, enabling superior line and load transient response across its operating range. Its externally compensated transconductance error amplifier (gm = 107 μA/V) and programmable soft-start (via SS pin current of 10 μA typical) support stable regulation under dynamic loads.
Switching frequency selection (650 kHz or 1.2 MHz) is controlled by the FREQ pin logic level, directly impacting inductor size, output ripple, and light-load efficiency trade-offs. The device enters pulse-skipping mode at light loads and transitions between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) based on inductor current relative to ripple magnitude.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3 V to 6 V - supports single-cell Li-ion, two-cell alkaline, or 3.3 V rail inputs without pre-regulation. |
| Max Output Voltage | 18.5 V - enables TFT LCD bias generation and white LED string driving in portable displays. |
| Switch Current Limit | 2.0 A minimum - ensures robust operation with 3.3 µH (1.2 MHz) or 6.8 µH (650 kHz) inductors under full load. |
| Feedback Reference | 1.238 V ±0.008 V - sets output voltage accuracy via external resistor divider (e.g., R1 = 158 kΩ, R2 = 18.2 kΩ for 12 V). |
| Quiescent Current | 100 µA typical - minimizes standby power loss in battery-powered GPS and digital camera applications. |
| Thermal Shutdown | 150 °C with 14 °C hysteresis - protects against sustained overloads or poor PCB thermal design without latch-off. |
| UVLO Threshold | 2.3 V rising - prevents erratic startup or brownout operation when input drops below usable battery voltage. |
Pinout & Package
TPS61085DGKTG4 is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm × 1.10 mm, optimized for compact portable layouts with exposed thermal pad not present. Pin functions are validated per TI SLVS859B Rev B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP | Transconductance amplifier output | Connects to external RC network (e.g., 47 kΩ + 1.6 nF) to stabilize loop dynamics and optimize transient response. |
| EN | Enable control input | Logic-high (>2 V) enables regulation; logic-low (<0.5 V) disables switch and reduces IN supply current to 1 µA. |
| FB | Feedback sensing node | Monitors output voltage via resistor divider; internal 1.238 V reference determines regulation setpoint. |
| FREQ | Frequency select input | Grounded → 650 kHz; tied to IN → 1.2 MHz - selects inductor/capacitor sizing and efficiency vs. size trade-off. |
| IN | Main power input | Accepts 2.3–6 V with 7 V absolute max; requires local 1 µF ceramic bypass and bulk 10 µF input capacitance. |
| PGND | Power ground return | Separate low-impedance path for switch current; must be routed away from signal ground to minimize noise coupling. |
| SW | Switch node | Drives external Schottky diode (e.g., PMEG2010AEH); voltage swings from near-GND to VS + VF during operation. |
| SS | Soft-start control | Charged at 10 µA to ramp current limit from 0 A to full scale; 100 nF capacitor yields ~10 ms startup time. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable soft-start | External capacitor (e.g., 100 nF) controls inrush current ramp rate, preventing input rail collapse during startup. |
| Selectable switching frequency | 650 kHz or 1.2 MHz selection allows optimization for either higher efficiency (low-freq) or smaller magnetics (high-freq). |
| External compensation | COMP pin interface enables precise loop tuning for varying output capacitance, load step, and inductor DCR conditions. |
| Thermal shutdown with hysteresis | 150 °C trip with 14 °C recovery margin avoids oscillation during thermal overload and supports safe derating. |
| Undervoltage lockout | 2.3 V enable threshold ensures reliable operation only within specified input range, eliminating brownout instability. |
Applications
| Handheld Devices | GPS Receivers |
|---|---|
Use Scenario: Powering dual-voltage RF front-end and baseband ICs from a single 3.3 V Li-ion cell. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5 V and 12 V rails for LNA, mixer, and ADC biasing. Use Value: Enables compact, battery-efficient design with <100 µA quiescent current and fast load transient response to burst-mode RF activity. |
Use Scenario: Supplying 12 V to active GPS antenna modules and 3.3 V to baseband processors in automotive navigation units. IC Role / Device Role / Timing Role: Primary boost converter delivering regulated 12 V output with pulse-skipping at idle to extend battery life. Use Value: Maintains >85% efficiency at 50 mA load (GPS cold start) while meeting tight EMI limits via selectable 650 kHz frequency. |
| Digital Still Cameras | TFT LCD Bias Supply |
Use Scenario: Generating 18.5 V for CCD/CMOS sensor bias and flash LED driver in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: High-voltage boost stage with 2.0-A switch current capability to support rapid flash charging cycles. Use Value: Delivers full 18.5 V output with <1.5% load regulation across 10 mA–300 mA, ensuring consistent image sensor performance. |
Use Scenario: Providing AVDD (12–15 V) and VGH (15–18 V) rails for small-format TFT panels in industrial HMIs and medical displays. IC Role / Device Role / Timing Role: Dual-rail generator using single TPS61085DGKTG4 with resistor-divider programming and soft-start sequencing. Use Value: Achieves <20 mVpp output ripple with 2×10 µF ceramic output caps, minimizing panel flicker and improving contrast ratio. |
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, 2.7–12 V input, fixed 500-kHz frequency, QFN-16 package | Supports higher output power (up to 25 W) and wider input range; lacks frequency select and soft-start adjustability | Choose for >1 A output current or >12 V input; avoid if VSSOP-8 footprint or 1.2 MHz operation is required |
| MT3608EN | 2-A switch, 2–24 V input, fixed 1.2 MHz, SOT23-6 package, no EN/FREQ/SS pins | Lower cost, minimal external components, but no UVLO, thermal shutdown, or compensation flexibility | Choose for cost-sensitive, low-complexity 12 V boost where safety features and precision regulation are secondary |
Compared with TPS61085DGKTG4, TPS61088RHLR offers higher power headroom and input range but sacrifices pin-level configurability and package compatibility, while MT3608EN provides integration simplicity at the expense of protection features and design adaptability for demanding portable applications.
Availability
TPS61085DGKTG4 is available at Aetrix Electronics and suitable for handheld devices, GPS receivers, and TFT LCD bias supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for TPS61085DGKTG4 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 solutions.
The TPS61085DGKTG4 belongs to TI's high-frequency boost converter product line, designed specifically for space-constrained portable electronics needing efficient, flexible, and robust voltage step-up from single-cell batteries or low-voltage rails.
FAQ
What is the maximum output voltage supported by the TPS61085DGKTG4?
The TPS61085DGKTG4 supports a maximum output voltage of 18.5 V, as specified in the absolute maximum ratings and confirmed across all operating conditions in the datasheet. This rating applies regardless of input voltage or load current, provided thermal limits are observed and external components (inductor, diode, capacitors) are rated accordingly. The TPS61085DGKTG4 achieves this using its integrated 2.0-A switch and current-mode control architecture.
Does the TPS61085DGKTG4 require external compensation components?
Yes, the TPS61085DGKTG4 requires external compensation components connected to the COMP pin to ensure stable loop operation. A typical network uses a series RC (e.g., 47 kΩ + 1.6 nF) selected based on inductor value, input/output voltages, and load current. The datasheet provides recommended values for both 650 kHz and 1.2 MHz configurations, and the TPS61085DGKTG4's transconductance amplifier (gm = 107 μA/V) enables precise tuning for specific application dynamics.
How does the FREQ pin affect switching frequency on the TPS61085DGKTG4?
The FREQ pin on the TPS61085DGKTG4 selects between two discrete switching frequencies: connecting FREQ to GND sets 650 kHz, while connecting it to IN sets 1.2 MHz. This selection directly impacts external component sizing-1.2 MHz allows use of smaller inductors (e.g., 3.3 µH) and capacitors, whereas 650 kHz improves light-load efficiency. The TPS61085DGKTG4's oscillator tolerances are ±20% at 1.2 MHz and ±25% at 650 kHz, as verified in typical characteristics graphs.
What is the purpose of the SS (soft-start) pin on the TPS61085DGKTG4?
The SS pin on the TPS61085DGKTG4 controls inrush current during startup by linearly ramping the internal current limit from 0 A to full scale (2.0 A) using an external capacitor charged at 10 µA. A 100 nF capacitor yields ~10 ms soft-start time, preventing input voltage sag and output overshoot. When EN is pulled low, the SS capacitor discharges to ground, resetting the ramp. This function is fully implemented in the TPS61085DGKTG4 and documented in Section 8.3.1 of the datasheet.
Can the TPS61085DGKTG4 operate with a 2.5 V input supply?
Yes, the TPS61085DGKTG4 can operate with a 2.5 V input supply, as its specified input voltage range is 2.3 V to 6 V. At 2.5 V, the device maintains regulation up to its maximum output voltage (18.5 V) with appropriate external components and thermal management. The undervoltage lockout releases at 2.3 V (rising), ensuring reliable startup, and quiescent current remains below 100 µA. This capability is explicitly validated in the TPS61085DGKTG4's recommended operating conditions table.
TPS61085DGKTG4 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:
- Discontinued at Digi-Key
- 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
TPS61085DGKTG4 FAQ
1.How can I place an order for TPS61085DGKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61085DGKTG4 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 TPS61085DGKTG4 reliable?
The price and inventory of TPS61085DGKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61085DGKTG4 is usually 5 days.
3.What payment methods are accepted for TPS61085DGKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61085DGKTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61085DGKTG4?
TPS61085DGKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61085DGKTG4 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 TPS61085DGKTG4?
For technical support, including TPS61085DGKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61085DGKTG4 requirements.
6.How does Aetrix verify that TPS61085DGKTG4 is sourced from the original manufacturer or authorized distributors?
All TPS61085DGKTG4 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 TPS61085DGKTG4 meets industry standards.
7.What is the process for return or replacement of TPS61085DGKTG4?
All TPS61085DGKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS61085DGKTG4, 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 TPS61085DGKTG4 part is unused and in its original packaging.
Return procedure for TPS61085DGKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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