My Inquiry
My Account
Texas Instruments TPS61085TDGKR
- Part No.:
- TPS61085TDGKR
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS61085TDGKR.pdf
- Description:
- IC REG BOOST ADJ 2A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,947
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS61085TDGKR from Texas Instruments is a high-frequency, current-mode boost DC-DC converter with integrated 2-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-skip modes. Used in handheld GPS receivers requiring stable 12 V/300 mA bias supply.
For engineers reviewing the TPS61085TDGKR datasheet, TPS61085TDGKR pinout, TPS61085TDGKR application, or TPS61085TDGKR equivalent, key selection criteria include input voltage range (2.3–6 V), peak switch current limit (2 A min), feedback reference voltage (1.238 V), thermal shutdown threshold (150°C), and VSSOP-8 package compatibility with PCB layout for high-frequency power stages.
Technical Context
The TPS61085TDGKR implements quasi-constant-frequency current-mode control with 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 loads and input conditions.
Switching frequency is selected via FREQ pin logic level: grounded for 650 kHz (higher efficiency), tied to IN for 1.2 MHz (smaller magnetics, faster transient response). Soft-start is controlled by constant-current charging (10 µA typical) of an external capacitor on SS pin, ramping peak inductor current from 0 A to full limit over ~10 ms with 100 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3 V to 6 V - supports single-cell Li-ion (3.0–4.2 V), 3.3 V rail, or two alkaline/NiMH cells. |
| Output Voltage Range | Up to 18.5 V - programmable via resistor divider on FB pin; 1.238 V internal reference enables precise regulation. |
| Switch Current Limit | 2 A minimum - ensures robust operation under peak load; max 3.2 A at TJ ≤ 125°C per electrical specs. |
| Switching Frequency | Selectable 650 kHz or 1.2 MHz - determines inductor size (6.8 µH vs 3.3 µH) and trade-off between efficiency and transient response. |
| Quiescent Current | 70–100 µA - enables low-power standby in battery-powered devices without compromising start-up speed. |
| Thermal Shutdown | 150°C activation with 14°C hysteresis - protects IC during overload or poor heatsinking; resumes operation at ~136°C. |
| UVLO Threshold | 2.3 V rising - prevents erratic operation during battery discharge; releases regulator only when VIN exceeds safe margin. |
Pinout & Package
TPS61085TDGKR is housed in an 8-pin VSSOP (DGK) package, 3.00 mm × 3.00 mm body size, with exposed thermal pad for enhanced power dissipation. Pinout conforms to TI's standard DGK footprint and is compatible with TSSOP-8 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Transconductance amplifier output | Connects external RC network to stabilize loop; sets phase margin and bandwidth for dynamic response. |
| 2 - FB | Feedback input | Senses output voltage via resistor divider; regulates VS to maintain 1.238 V at this node. |
| 3 - EN | Enable control input | Logic-high (>2 V) enables converter; logic-low (<0.5 V) places device in shutdown (ISDVIN ≤ 1 µA). |
| 4 - PGND | Power ground return | Low-impedance path for switch current; must be routed separately from signal ground to minimize noise coupling. |
| 5 - SW | Switch node | Drives external Schottky diode (e.g., PMEG2010AEH); carries pulsed 2-A peak current at switching frequency. |
| 6 - IN | Main power input | Accepts 2.3–6 V; requires local 1 µF ceramic bypass and bulk 10 µF input capacitance for EMI suppression. |
| 7 - FREQ | Frequency select input | GND = 650 kHz; connected to IN = 1.2 MHz - configures oscillator without external components. |
| 8 - SS | Soft-start control | Charged by 10 µA internal current source; 100 nF yields ~10 ms ramp time to limit inrush into output capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable soft-start | External capacitor (e.g., 100 nF) on SS pin controls inrush current ramp rate - prevents input rail collapse during startup. |
| Selectably optimized frequency | 650 kHz or 1.2 MHz selection balances efficiency (lower fSW) vs. component size/transient response (higher fSW). |
| Externally compensated loop | COMP pin allows tuning RCOMP/CCOMP (e.g., 47 kΩ/1.6 nF at 1.2 MHz) for stability across wide load and input ranges. |
| Integrated 2-A power switch | 0.13 Ω RDS(on) at 5 V gate drive - reduces conduction loss and eliminates need for external MOSFET driver. |
| Overvoltage protection | Stops switching if FB voltage exceeds 1.275 V (~3% above 1.238 V) - safeguards downstream circuitry from output overvoltage. |
Applications
| Handheld GPS Receiver | Digital Still Camera LCD Bias |
|---|---|
Use Scenario: Portable GPS unit powered by single Li-ion cell (3.0–4.2 V) requiring stable 12 V for RF front-end and GNSS module. IC Role / Device Role / Timing Role: Primary boost regulator generating regulated 12 V/300 mA output; operates in CCM at light-to-moderate load. Use Value: 650 kHz mode delivers >90% efficiency at 3.3 VIN, minimizing heat rise in compact enclosure while maintaining fast transient response to burst-mode GNSS acquisition. |
Use Scenario: DSLR or mirrorless camera needing dual-polarity TFT-LCD bias rails (e.g., +12 V and –5 V), where +12 V is derived from main battery. IC Role / Device Role / Timing Role: High-voltage boost stage feeding charge pump or inverting regulator; configured for 1.2 MHz to reduce inductor footprint near sensitive analog imaging circuits. Use Value: 1.2 MHz operation enables use of 3.3 µH inductor (Sumida CDPH4D19F), reducing board area by 40% vs. 6.8 µH solution while maintaining <100 mV output ripple under 500 mA step load. |
| PCMCIA Card Power Supply | TFT LCD Panel Bias Generator |
Use Scenario: Legacy PCMCIA card (Type II, 5 V nominal) requiring 12 V auxiliary rail for flash memory programming or RF interface. IC Role / Device Role / Timing Role: Standalone boost converter on card edge; EN pin synchronized to host insertion detection logic. Use Value: Undervoltage lockout (2.3 V) ensures reliable startup even as host-supplied 5 V rail sags during hot-plug; thermal shutdown prevents damage during sustained write cycles. |
Use Scenario: Industrial TFT display (800×480) powered from 3.3 V system rail, needing 15 V VGH and 10 V VGL for gate driver ICs. IC Role / Device Role / Timing Role: Primary high-side boost stage delivering 15 V/200 mA; FB divider set with 158 kΩ/18.2 kΩ for precise 15.0 V output. Use Value: Adjustable soft-start (100 nF on SS) limits inrush into 20 µF output bank, preventing brownout of 3.3 V microcontroller during panel power-up sequence. |
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/1-MHz frequency; no FREQ pin; uses internal compensation. | Better suited for >1-A output loads; lacks frequency select and external compensation flexibility. | Choose TPS61088RHLR only when higher output current and simplified design outweigh need for adjustable soft-start and loop tuning. |
| MAX17222ETA+ | 2.5-V to 5.5-V input, 28-V max output, 2-A switch, fixed 1.2-MHz frequency; integrated soft-start; no FREQ or COMP pins. | Smaller solution size (1.6 mm × 1.6 mm WLP), but no frequency selection or external compensation - less adaptable to varied EMI/noise constraints. | Select MAX17222ETA+ for space-constrained portable designs where 1.2-MHz-only operation and fixed compensation meet requirements. |
Compared with TPS61085TDGKR, TPS61088RHLR offers higher current capability but sacrifices frequency selectability and loop customization, while MAX17222ETA+ reduces footprint at the cost of design flexibility - making TPS61085TDGKR optimal for applications demanding tunable transient response and multi-frequency optimization.
Availability
TPS61085TDGKR is available at Aetrix Electronics and suitable for handheld GPS receivers, digital still camera LCD bias supplies, PCMCIA card auxiliary power, TFT LCD panel bias generation, and DSL modem power management requiring stable component supply and long-term industrial availability.
Supply support for TPS61085TDGKR 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-efficiency DC-DC conversion.
The TPS61085T product line delivers high-voltage boost solutions for portable electronics, designed specifically for applications needing >12 V outputs from single-cell batteries while maintaining tight regulation and robust protection features.
FAQ
What is the maximum output voltage supported by the TPS61085TDGKR?
The TPS61085TDGKR supports a maximum output voltage of 18.5 V, as specified in its absolute maximum ratings and confirmed in the recommended operating conditions table. This limit is enforced by internal overvoltage protection that disables switching if the FB pin voltage exceeds ~1.275 V (3% above the 1.238 V reference), ensuring downstream circuit safety. Output voltage is set externally using a resistor divider on the FB pin.
Does the TPS61085TDGKR require external compensation components?
Yes, the TPS61085TDGKR requires external compensation components connected to the COMP pin to ensure loop stability. The device uses an external transconductance error amplifier, and TI provides recommended RCOMP/CCOMP values - for example, 47 kΩ and 1.6 nF for 1.2 MHz operation with 3.3 µH inductor and 12 V output - based on detailed analysis in the datasheet's Application and Implementation section.
How does the FREQ pin affect switching frequency in the TPS61085TDGKR?
The FREQ pin on the TPS61085TDGKR selects between two fixed switching frequencies: connecting FREQ to GND sets 650 kHz, while connecting it to IN sets 1.2 MHz. This selection directly impacts inductor size (6.8 µH vs. 3.3 µH), efficiency (higher at 650 kHz), and transient response (faster at 1.2 MHz). No external clock or resistor is needed - the choice is purely logic-level driven.
What is the purpose of the SS (soft-start) pin on the TPS61085TDGKR?
The SS pin on the TPS61085TDGKR controls inrush current during startup by enabling adjustable soft-start. An external capacitor (e.g., 100 nF) is charged at 10 µA, ramping the internal current limit from 0 A to full 2-A limit over ~10 ms. This prevents input voltage droop and output overshoot, especially critical when powering large output capacitor banks in portable devices like GPS receivers or cameras.
Can the TPS61085TDGKR operate from a single alkaline cell?
Yes, the TPS61085TDGKR can operate from a single alkaline cell, whose nominal voltage is 1.5 V and discharged endpoint is ~0.9 V. However, its minimum input voltage is 2.3 V - so it requires at least two alkaline or NiMH cells (2 × 1.2 V = 2.4 V nominal) to function reliably across the full discharge curve. Single-cell operation is feasible only with Li-ion (3.0–4.2 V) or LiFePO4 (2.8–3.6 V) chemistries.
TPS61085TDGKR 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
TPS61085TDGKR FAQ
1.How can I place an order for TPS61085TDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61085TDGKR 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 TPS61085TDGKR reliable?
The price and inventory of TPS61085TDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61085TDGKR is usually 5 days.
3.What payment methods are accepted for TPS61085TDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61085TDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61085TDGKR?
TPS61085TDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61085TDGKR 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 TPS61085TDGKR?
For technical support, including TPS61085TDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61085TDGKR requirements.
6.How does Aetrix verify that TPS61085TDGKR is sourced from the original manufacturer or authorized distributors?
All TPS61085TDGKR 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 TPS61085TDGKR meets industry standards.
7.What is the process for return or replacement of TPS61085TDGKR?
All TPS61085TDGKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61085TDGKR, 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 TPS61085TDGKR part is unused and in its original packaging.
Return procedure for TPS61085TDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS61085TDGKR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
