My Inquiry
My Account
Texas Instruments TPS61085TPWR
- Part No.:
- TPS61085TPWR
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS61085TPWR.pdf
- Description:
- IC REG BOOST ADJ 2A 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,975
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS61085TPWR 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 and digital still cameras requiring compact, efficient voltage boosting.
For engineers reviewing the TPS61085TPWR datasheet, TPS61085TPWR pinout, TPS61085TPWR application, or TPS61085TPWR equivalent, key selection considerations include input voltage range (2.3–6 V), peak switch current limit (2–3.2 A), feedback reference voltage (1.238 V), thermal shutdown threshold (150°C), and dual-frequency operation enabled by FREQ pin logic level.
Technical Context
The TPS61085TPWR employs 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 determined by FREQ pin state: grounded for 650 kHz (±170 kHz tolerance), tied to IN for 1.2 MHz (±300 kHz). The device enters pulse-skipping mode at light loads to maintain regulation while minimizing quiescent current (70–100 µA).
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), 2xAA/AAA (2.4–3.2 V), and regulated 3.3 V rails without dropout risk. |
| Output Voltage Range | Up to 18.5 V - configurable via resistor divider on FB pin; enables TFT LCD bias, white LED strings, and DSL modem supplies. |
| Switch Current Limit | 2 A minimum, 3.2 A max - defines maximum sustainable inductor peak current; determines power delivery capability at low VIN. |
| Feedback Reference | 1.238 V ±0.008 V - sets output regulation accuracy; used with R1/R2 divider to set VS = Vref × (1 + R1/R2). |
| Quiescent Current | 70–100 µA - enables battery-powered operation with minimal standby drain; measured at VIN = 3.3 V, no switching. |
| Thermal Shutdown | 150°C activation, 136°C hysteresis - protects internal MOSFET and package during sustained overload or poor PCB thermal design. |
| ESD Rating (HBM) | ±2000 V - meets JEDEC JS-001 Class 2; ensures robustness during board assembly and handling. |
Pinout & Package
TPS61085TPWR is packaged in an 8-pin VSSOP (DGK) with 3.00 mm × 3.00 mm body size and 0.65 mm lead pitch. Thermal performance is characterized by RθJA = 189.3°C/W (JEDEC high-K board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Transconductance amplifier output | Connects external RC network to stabilize loop; sets phase margin and transient response speed. |
| 2 - FB | Feedback input | Senses output voltage via resistor divider; regulates VS to 1.238 V reference with ±0.6% typical accuracy. |
| 3 - EN | Enable control input | Logic-high (>2 V) enables regulator; logic-low (<0.5 V) disables switching and reduces IN current to 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 inductor and Schottky diode; handles 2-A peak current with 0.13-Ω RDS(on) at VIN = 5 V. |
| 6 - IN | Main power input | Accepts 2.3–6 V; requires local 1-µF ceramic bypass and bulk 10-µF input capacitance near pin. |
| 7 - FREQ | Frequency select input | GND = 650 kHz (higher efficiency); connected to IN = 1.2 MHz (smaller magnetics, faster transient response). |
| 8 - SS | Soft-start control | Connects external capacitor (e.g., 100 nF) to ramp current limit from 0 A to full scale; prevents inrush into output caps. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable soft-start | Controlled by external SS capacitor; enables precise inrush current limiting during power-up without external circuitry. |
| Selectably optimized frequency | 650 kHz or 1.2 MHz via single FREQ pin - balances inductor size (3.3 µH @ 1.2 MHz vs. 6.8 µH @ 650 kHz) and efficiency trade-offs. |
| External compensation | COMP pin allows tuning of loop bandwidth and phase margin for diverse output capacitors, loads, and PCB layouts. |
| Integrated 2-A power switch | 0.13-Ω RDS(on) N-MOSFET eliminates external switch; reduces BOM count and layout complexity in space-constrained designs. |
| Multi-mode operation | Automatically transitions between CCM, DCM, and pulse-skip modes to maintain regulation across 1 mA to 600 mA load range. |
Applications
| Handheld GPS Receiver | Digital Still Camera |
|---|---|
Use Scenario: Boosts single-cell Li-ion (3.3 V nominal) to 12 V for GPS RF front-end and LNA bias. IC Role / Device Role / Timing Role: Primary voltage booster supplying stable 12 V/300 mA with fast load transient response to handle burst-mode RF transmission. Use Value: Enables compact form factor by eliminating discrete boost stages; 1.2 MHz operation allows 3.3 µH inductor and small 10 µF ×2 ceramic output caps. |
Use Scenario: Generates 15 V from 3.3 V system rail to power CCD/CMOS sensor bias and flash LED drivers. IC Role / Device Role / Timing Role: High-efficiency step-up regulator delivering up to 18.5 V with programmable soft-start to prevent camera startup glitches. Use Value: Adjustable frequency avoids audible noise in image capture; thermal shutdown protects against lens motor surge currents. |
| TFT LCD Bias Supply | DSL Modem Power Stage |
Use Scenario: Supplies positive (VPOS) and negative (VNEG) bias voltages for active-matrix LCD panels in portable displays. IC Role / Device Role / Timing Role: Configured as positive boost stage (e.g., 3.3 V → 15 V) feeding charge-pump inverter for VNEG generation. Use Value: Tight 1.238 V reference and low load regulation (0.11%/A) ensure stable panel contrast across temperature and battery discharge. |
Use Scenario: Provides 12 V/600 mA for DSL line driver ICs and analog front-end circuitry in residential gateways. IC Role / Device Role / Timing Role: Primary DC-DC converter operating in CCM at full load; uses 650 kHz mode for peak efficiency under continuous ADSL2+ traffic. Use Value: Undervoltage lockout (2.3 V) prevents brownout resets during AC adapter fluctuations; PGND pin simplifies high-current return routing. |
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 5-A switch current, 2.7–12 V input, fixed 500 kHz/2.2 MHz frequency selection, no FREQ pin. | Targets higher-power applications (e.g., 5 V → 20 V @ 2 A); lacks adjustable soft-start and external compensation flexibility. | Choose TPS61088RHLR only when >2 A output current or wider input range is required; not drop-in compatible due to different pinout and control architecture. |
| MAX17062ETA+ | 2.5–5.5 V input, 28 V max output, 2.5-A switch, fixed 1.2 MHz, integrated soft-start, no external compensation. | Optimized for ultra-compact footprint; lacks frequency select and manual loop tuning - less adaptable to custom EMI or transient requirements. | Prefer MAX17062ETA+ for space-constrained consumer devices where fixed 1.2 MHz and simplified layout outweigh flexibility needs. |
Compared with TPS61085TPWR, TPS61088RHLR delivers higher current but sacrifices pin-compatible upgrade path and external compensation; MAX17062ETA+ offers smaller solution size but removes critical design controls like frequency selection and loop tuning - making TPS61085TPWR optimal for mid-power, thermally sensitive, or EMI-critical applications requiring full configurability.
Availability
TPS61085TPWR is available at Aetrix Electronics and suitable for handheld GPS receivers, digital still cameras, TFT LCD bias supplies, and DSL modem power stages requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for TPS61085TPWR 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 over 90 years of innovation in high-reliability, high-performance electronic components.
The TPS61085TPWR belongs to TI's high-efficiency boost converter product line, designed specifically for portable and battery-powered systems needing compact, flexible, and thermally robust voltage boosting from low-input sources.
FAQ
What is the absolute maximum input voltage rating for the TPS61085TPWR?
The TPS61085TPWR has an absolute maximum input voltage rating of 7 V on the IN pin, as specified in Section 6.1 of the SLVSA41B datasheet. Exceeding this voltage - even momentarily - may cause permanent damage. Recommended operating input voltage remains 2.3 V to 6 V, with undervoltage lockout engaging below 2.2 V to prevent malfunction.
How does the FREQ pin affect switching frequency in the TPS61085TPWR?
In the TPS61085TPWR, the FREQ pin selects between two fixed oscillator frequencies: connecting FREQ to GND sets 650 kHz (±170 kHz), while connecting it to IN sets 1.2 MHz (±300 kHz). This selection directly impacts inductor size, output ripple, and light-load efficiency - 1.2 MHz enables smaller 3.3 µH inductors, whereas 650 kHz improves full-load efficiency by ~2–3%.
Can the TPS61085TPWR drive a 12-V, 600-mA load from a 3.3-V input?
Yes, the TPS61085TPWR can deliver 12 V at 600 mA from a 3.3-V input, as validated in the typical application circuit (Figure 8, SLVSA41B). At 1.2 MHz, with 3.3 µH inductor and PMEG2010AEH Schottky diode, efficiency reaches ~88% at full load. Peak switch current remains within the 2–3.2 A limit, and thermal performance is maintained with proper PCB copper area per RθJA = 189.3°C/W.
What is the purpose of the COMP pin on the TPS61085TPWR?
The COMP pin on the TPS61085TPWR is the output of the internal transconductance error amplifier (gm = 107 µA/V). It interfaces with an external RC network to set loop gain, phase margin, and transient response. Proper compensation - e.g., 47 kΩ and 1.6 nF for 3.3 V → 12 V at 1.2 MHz - ensures stability across load and input variations, preventing oscillation or excessive overshoot during load steps.
Does the TPS61085TPWR include built-in protection features?
Yes, the TPS61085TPWR integrates multiple protection functions: undervoltage lockout (UVLO) activates below 2.2 V input, thermal shutdown triggers at 150°C junction temperature with 14°C hysteresis, and overvoltage protection halts switching if FB exceeds 1.275 V (3% above 1.238 V). These features safeguard both the IC and downstream circuitry without requiring external components.
TPS61085TPWR 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
TPS61085TPWR FAQ
1.How can I place an order for TPS61085TPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61085TPWR 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 TPS61085TPWR reliable?
The price and inventory of TPS61085TPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61085TPWR is usually 5 days.
3.What payment methods are accepted for TPS61085TPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61085TPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61085TPWR?
TPS61085TPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61085TPWR 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 TPS61085TPWR?
For technical support, including TPS61085TPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61085TPWR requirements.
6.How does Aetrix verify that TPS61085TPWR is sourced from the original manufacturer or authorized distributors?
All TPS61085TPWR 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 TPS61085TPWR meets industry standards.
7.What is the process for return or replacement of TPS61085TPWR?
All TPS61085TPWR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61085TPWR, 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 TPS61085TPWR part is unused and in its original packaging.
Return procedure for TPS61085TPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS61085TPWR 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…
