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Texas Instruments TPS61085PWR
- Part No.:
- TPS61085PWR
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS61085PWR.pdf
- Description:
- IC REG BOOST ADJ 2A 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,581
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Product details
Overview
TPS61085PWR from Texas Instruments is a high-efficiency, adjustable-frequency step-up 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 operates in current-mode control with external compensation, selectable 650 kHz or 1.2 MHz switching, and adjustable soft-start-designed for portable TFT LCD bias supplies delivering 12 V at 300–600 mA.
For engineers reviewing the TPS61085PWR datasheet, TPS61085PWR pinout, TPS61085PWR application, or TPS61085PWR equivalent, key selection criteria include input voltage range (2.3–6 V), peak switch current limit (2.0 A min), feedback regulation voltage (1.238 V), thermal shutdown threshold (150 °C), and VSSOP-8 package compatibility with PCB layout constraints for handheld and space-constrained systems.
Technical Context
The TPS61085PWR implements quasi-constant-frequency current-mode control with adaptive off-time for superior line and load transient response. Its externally compensated error amplifier (transconductance gm = 107 μA/V) enables stability optimization across varying output loads and input conditions.
Switching frequency is selected via the FREQ pin: grounded for 650 kHz (higher efficiency, larger inductors) or tied to IN for 1.2 MHz (faster transients, smaller passives). Soft-start is controlled by an external capacitor on SS, ramping peak inductor current from 0 A to full limit as VSS rises from 0.3 V to 0.8 V.
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), 2× alkaline (2.4–3.2 V), or 3× NiMH (3.0–4.5 V) sources without pre-regulation. |
| Output Voltage Range | Up to 18.5 V - programmable via resistor divider on FB pin; typical 12 V output for TFT LCD bias rails. |
| Switch Current Limit | 2.0 A minimum - enables ≥600 mA output at 12 V with >90% efficiency under 3.3 V input. |
| Switching Frequency | 650 kHz or 1.2 MHz - selectable via FREQ pin; determines inductor size (6.8 µH vs. 3.3 µH) and ripple trade-offs. |
| Feedback Reference | 1.238 V ±0.008 V - precise internal reference enabling <±1% output voltage accuracy with proper R1/R2 divider. |
| Quiescent Current | 100 µA typical - ensures low standby power draw in battery-powered GPS receivers and digital cameras. |
| Thermal Shutdown | 150 °C with 14 °C hysteresis - protects against sustained overload or poor PCB thermal design in enclosed handhelds. |
Pinout & Package
TPS61085PWR is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm × 1.10 mm, optimized for compact portable layouts and compatible with standard surface-mount reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Compensation node | Output of transconductance error amplifier; connects to RC network for loop stability tuning (e.g., 47 kΩ + 1.6 nF). |
| 2 - FB | Feedback input | Senses output voltage via resistor divider; regulates VS to 1.238 V reference - sets final output (e.g., 12 V with R1=158 kΩ, R2=18.2 kΩ). |
| 3 - EN | Enable control | Active-high logic input; tie to VIN or microcontroller GPIO to power-cycle converter; draws <0.1 µA when disabled. |
| 4 - PGND | Power ground | High-current return path for switch and inductor; must be routed separately from signal ground to minimize noise coupling. |
| 5 - SW | Switch node | Drives external inductor and Schottky diode (e.g., PMEG2010AEH); swings from near-GND to VS + Vf; requires tight layout to reduce EMI. |
| 6 - IN | Input supply | Connects to input source (2.3–6 V); requires local 1 µF ceramic bypass and bulk 10 µF capacitor to suppress ripple and surge currents. |
| 7 - FREQ | Frequency select | Logic-level input: GND → 650 kHz, VIN → 1.2 MHz; determines optimal inductor value and system efficiency vs. transient performance. |
| 8 - SS | Soft-start control | Connects to external capacitor (e.g., 100 nF) to linearly ramp current limit during startup; prevents inrush into large output caps or downstream loads. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable soft-start | External capacitor on SS pin controls ramp time of peak switch current - eliminates input rail sag and prevents diode overstress during power-up. |
| Selectably optimized frequency | 650 kHz or 1.2 MHz operation allows trade-off between efficiency (lower fS) and component size/transient response (higher fS). |
| Externally compensated loop | COMP pin access enables custom pole-zero placement for stable regulation across wide output capacitance (10–47 µF) and load ranges (1–600 mA). |
| Integrated 2.0-A power switch | 0.13-Ω rDS(on) MOSFET reduces conduction loss - delivers >88% efficiency at 12 V/300 mA from 3.3 V input in typical layout. |
| Robust protection suite | Includes undervoltage lockout (2.3 V turn-on), thermal shutdown (150 °C), and overvoltage detection (FB > 1.275 V) to safeguard load and IC. |
Applications
| Handheld GPS Receivers | Digital Still Cameras |
|---|---|
Use Scenario: Powering GPS RF front-end and baseband ICs requiring stable 3.3 V and 5 V rails from single-cell lithium battery. IC Role / Device Role / Timing Role: Step-up converter generating regulated 5 V from decaying 3.0–4.2 V battery; maintains constant output during satellite acquisition bursts. Use Value: 650 kHz mode minimizes inductor size while sustaining >90% efficiency across full battery discharge curve - extends runtime by 12% vs. fixed-frequency alternatives. |
Use Scenario: Supplying CCD/CMOS image sensor bias and flash LED driver circuits in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Generates 12 V for sensor analog bias and 5 V for logic from 3.7 V Li-ion; soft-start prevents shutter lag during rapid power cycling. Use Value: Adjustable soft-start (via 100 nF SS cap) limits inrush to <150 mA - avoids brownout of MCU during wake-from-sleep sequences. |
| TFT LCD Bias Supplies | DSL Modem Line Cards |
Use Scenario: Providing AVDD (12–15 V) and VGH (18.5 V) rails for active-matrix LCD panels in portable medical monitors and industrial HMIs. IC Role / Device Role / Timing Role: High-voltage boost stage delivering 18.5 V at 100 mA with <1% regulation; FREQ pin set to 1.2 MHz for fast response to backlight dimming commands. Use Value: 1.2 MHz operation enables use of 3.3 µH inductor - reduces board area by 40% vs. 650 kHz designs while maintaining <20 mVpp output ripple. |
Use Scenario: Generating isolated 12 V auxiliary supply for DSL PHY and line driver ICs in residential gateway modems operating from 5 V USB or wall adapter input. IC Role / Device Role / Timing Role: Non-isolated boost converter stepping 5 V to 12 V for analog front-end; EN pin synchronized to DSL link state for power gating. Use Value: Thermal shutdown (150 °C) and UVLO (2.3 V) ensure reliable operation during ambient temperature spikes and input brownouts - meets GR-909 reliability requirements. |
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, wider 2.7–12 V input, same 8-pin VQFN package but different pinout and no FREQ pin. | Targets higher-power applications (e.g., 12 V/1 A) where TPS61085PWR's 2.0-A limit is insufficient; lacks frequency select flexibility. | Choose TPS61088RHLR only if output current >500 mA is required and PCB redesign accommodates new pinout and compensation scheme. |
| MT3608EN | Fixed 1.2 MHz, 2-A switch, 2–24 V input, SOT-23-6 package; no soft-start, no external compensation, lower precision FB (1.25 V). | Cost-sensitive, space-constrained designs where adjustable frequency and fine regulation are unnecessary - e.g., basic LED drivers. | Use MT3608EN only for non-critical 12 V outputs where ±3% accuracy and minimal transient response are acceptable; not suitable for TFT bias or GPS. |
Compared with TPS61085PWR, TPS61088RHLR offers higher current capacity but sacrifices frequency selectability and pin compatibility, while MT3608EN reduces cost and size at the expense of regulation accuracy, protection features, and design flexibility - making TPS61085PWR optimal for mid-power portable systems demanding balance of performance, configurability, and reliability.
Availability
TPS61085PWR is available at Aetrix Electronics and suitable for handheld GPS receivers, digital still cameras, TFT LCD bias supplies, and DSL modem line cards requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS61085PWR 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 ICs, with decades of expertise in high-efficiency DC-DC conversion and automotive-grade reliability.
The TPS61085PWR belongs to TI's Boost Converter product line, engineered specifically for portable and battery-powered applications needing compact, high-voltage step-up capability with robust protection and flexible configuration - targeting space-constrained consumer and industrial devices.
FAQ
What input voltage range does the TPS61085PWR support?
TPS61085PWR supports an input voltage range of 2.3 V to 6 V, validated across –40°C to 85°C ambient. This range accommodates single-cell Li-ion (2.7–4.2 V), two-cell alkaline (2.4–3.2 V), or three-cell NiMH (3.0–4.5 V) batteries without external pre-regulation. Operation below 2.3 V triggers undervoltage lockout, and absolute maximum rating is 7 V - exceeding this risks permanent damage.
How is the output voltage set on the TPS61085PWR?
The output voltage of TPS61085PWR is set using an external resistor divider connected to the FB pin, which references an internal 1.238 V bandgap. For a 12 V output, typical values are R1 = 158 kΩ and R2 = 18.2 kΩ, yielding VOUT = 1.238 V × (1 + R1/R2). The FB pin draws only 0.1 µA bias current, minimizing divider power loss and enabling high-impedance networks for low quiescent current.
Can the TPS61085PWR operate at both 650 kHz and 1.2 MHz simultaneously?
No - the TPS61085PWR selects one fixed switching frequency at power-up based on the FREQ pin state: grounded for 650 kHz or tied to IN for 1.2 MHz. The frequency cannot be dynamically changed during operation. The datasheet specifies typical ranges of 480–820 kHz (FREQ = GND) and 0.9–1.5 MHz (FREQ = IN), with slight variation due to rDS(on) voltage drop effects on timing.
What is the purpose of the SS pin on the TPS61085PWR?
The SS (soft-start) pin on TPS61085PWR controls inrush current during startup by ramping the internal current limit from 0 A to full 2.0-A limit as an external capacitor charges from 0.3 V to 0.8 V at ~10 µA. A 100 nF capacitor yields ~10 ms soft-start time - sufficient to prevent input rail collapse and protect downstream capacitors and diodes in portable systems.
Does the TPS61085PWR require external compensation components?
Yes - the TPS61085PWR uses external compensation via the COMP pin to stabilize its current-mode control loop. A typical network is 47 kΩ in series with 1.6 nF, but values depend on inductor (3.3 µH for 1.2 MHz or 6.8 µH for 650 kHz), output voltage, and load. TI provides recommended RCOMP/CCOMP tables; omitting or mis-sizing these causes oscillation or poor transient response in TPS61085PWR applications.
TPS61085PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
TPS61085PWR FAQ
1.How can I place an order for TPS61085PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61085PWR 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 TPS61085PWR reliable?
The price and inventory of TPS61085PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61085PWR is usually 5 days.
3.What payment methods are accepted for TPS61085PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61085PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61085PWR?
TPS61085PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61085PWR 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 TPS61085PWR?
For technical support, including TPS61085PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61085PWR requirements.
6.How does Aetrix verify that TPS61085PWR is sourced from the original manufacturer or authorized distributors?
All TPS61085PWR 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 TPS61085PWR meets industry standards.
7.What is the process for return or replacement of TPS61085PWR?
All TPS61085PWR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61085PWR, 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 TPS61085PWR part is unused and in its original packaging.
Return procedure for TPS61085PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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