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Texas Instruments TPS61085PWG4
- Part No.:
- TPS61085PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS61085PWG4.pdf
- Description:
- IC REG BOOST ADJ 2A 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,461
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Product details
Overview
TPS61085PWG4 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 external compensation for stability optimization. Used in portable TFT LCD bias supplies delivering 12 V at 300–600 mA.
For engineers reviewing the TPS61085PWG4 datasheet, TPS61085PWG4 pinout, TPS61085PWG4 application, or TPS61085PWG4 equivalent, key selection considerations 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 high-frequency boost designs.
Technical Context
The TPS61085PWG4 operates in quasi-constant-frequency current-mode control with adaptive off-time, enabling superior line and load transient response. Its externally compensated transconductance error amplifier (gm = 107 μA/V) allows loop tuning across wide operating conditions including CCM/DCM boundary transitions and pulse-skipping at light loads.
Switching frequency is selected via FREQ pin logic level: grounded for 650 kHz (optimized for efficiency), tied to IN for 1.2 MHz (optimized for small magnetics and faster transients). Undervoltage lockout (UVLO) activates at 2.2 V falling and releases at 2.3 V rising; thermal shutdown triggers at 150 °C with 14 °C hysteresis.
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) inputs without pre-regulation. |
| Max Output Voltage | 18.5 V - enables TFT LCD panel bias generation (VGH/VGL), white LED strings, or PMIC auxiliary rails. |
| Switch Current Limit | 2.0 A (min) - defines maximum inductor peak current; supports ≥600 mA output at 12 V with >90% efficiency using 3.3 µH inductor. |
| Feedback Voltage | 1.238 V (±0.008 V) - sets output via resistor divider; enables precise 12 V output with R1 = 158 kΩ, R2 = 18.2 kΩ. |
| Quiescent Current | 100 μA (typ) - ensures low standby power draw in battery-powered handheld devices during sleep mode. |
| Thermal Shutdown | 150 °C junction - protects against sustained overload or poor PCB thermal design; recovers at ~136 °C. |
| ESD Rating (HBM) | ±2000 V - meets IEC 61000-4-2 Level 2 requirements for robustness in consumer electronics assembly and field use. |
Pinout & Package
TPS61085PWG4 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 0.65-mm pitch SMT reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP | Transconductance amplifier output | Connects to external RC network (e.g., 47 kΩ + 1.6 nF) to stabilize control loop and optimize transient response. |
| EN | Enable input | Active-high logic control; pull to VIN to enable, GND to disable (shutdown current = 1 μA). |
| FB | Feedback input | Senses output voltage divider; regulates output to 1.238 V reference; bias current = 0.1 μA. |
| FREQ | Frequency select | GND → 650 kHz; connect to IN → 1.2 MHz; determines inductor size, efficiency trade-off, and ripple performance. |
| IN | Power input | Accepts 2.3–6 V; requires local 1 μF ceramic bypass and bulk 10 μF input capacitance for EMI suppression. |
| PGND | Power ground | High-current return path for switch node; must be routed separately 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; requires tight layout. |
| SS | Soft-start control | Connect 100 nF capacitor to GND to ramp current limit linearly; prevents inrush into output capacitors at startup. |
Key Features
| Feature | Design Value |
|---|---|
| Selectable switching frequency | 650 kHz or 1.2 MHz - enables trade-off between component size (smaller inductors/caps at 1.2 MHz) and light-load efficiency (higher at 650 kHz). |
| Adjustable soft-start | Programmable via external SS capacitor - eliminates input voltage droop and output overshoot during power-up; typical 100 nF yields ~10 ms ramp. |
| External compensation | COMP pin interfaces with user-defined RC network - allows loop bandwidth and phase margin tuning for diverse output capacitance and load conditions. |
| Integrated 2.0-A switch | 0.13-Ω rDS(on) at 5 V gate drive - reduces conduction loss and thermal stress; supports ≥600 mA at 12 V with minimal heatsinking. |
| Robust protection suite | Includes UVLO (2.2 V), thermal shutdown (150 °C), and overvoltage detection on FB pin - prevents damage under fault or misconfiguration. |
Applications
| TFT LCD Bias Supply | Handheld GPS Receiver |
|---|---|
Use Scenario: Generating 18.5 V VGH and 12 V AVDD for active-matrix TFT displays in portable navigation devices. IC Role / Device Role / Timing Role: Primary boost regulator providing stable high-voltage rail with fast load transient response to pixel charging demands. Use Value: Enables compact, single-chip bias solution eliminating discrete charge pumps; maintains display contrast and response time across battery discharge (2.3–4.2 V). |
Use Scenario: Powering GPS baseband IC and RF front-end requiring regulated 3.3 V or 5 V from declining single-cell Li-ion battery. IC Role / Device Role / Timing Role: Efficient step-up converter supplying clean, low-noise supply to sensitive GNSS receivers during cold/warm starts. Use Value: Delivers >90% efficiency at 300 mA while maintaining <10 mV output ripple; extends battery runtime by minimizing quiescent current (100 μA). |
| Digital Still Camera Flash Driver | PCMCIA Card Power Management |
Use Scenario: Charging high-voltage capacitor for xenon flash or powering white LED arrays in compact digital cameras. IC Role / Device Role / Timing Role: High-current boost stage delivering up to 18.5 V at burst loads; soft-start prevents camera power rail collapse during flash charging. Use Value: Supports rapid flash recharge cycles (<1 s) with controlled inrush; thermal shutdown prevents overheating during repeated bursts. |
Use Scenario: Providing isolated 5 V or 3.3 V supply to PCMCIA/CompactFlash peripherals from 3.3 V host bus or battery source. IC Role / Device Role / Timing Role: Compact, low-profile boost converter meeting JEDEC MO-153 mechanical constraints and hot-swap sequencing requirements. Use Value: VSSOP-8 footprint fits tight card-edge space; EN pin enables software-controlled power gating; UVLO ensures reliable operation during bus voltage sag. |
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 limit, 2.7-V min input, fixed 500-kHz/1-MHz frequency (no FREQ pin), QFN-16 package. | Supports higher output current (≥1.5 A) and wider input range; lacks pin-selectable frequency and soft-start adjustability. | Choose when >1 A output or lower minimum input voltage is required; not drop-in due to different package and pinout. |
| MAX17062ETA+ | 2.5-A switch, 2.5-V min input, fixed 1.2-MHz frequency, internal compensation, 8-pin TDFN package. | Reduces BOM count (no COMP/SS components) but sacrifices loop tuning flexibility and soft-start customization. | Prefer for cost-sensitive, space-constrained designs where fixed-frequency simplicity outweighs external compensation needs. |
Compared with TPS61085PWG4, TPS61088RHLR delivers higher current capability and broader input range but requires PCB redesign and loses frequency selectability; MAX17062ETA+ simplifies layout with internal compensation yet forfeits transient optimization and soft-start control-making TPS61085PWG4 optimal for balanced performance, flexibility, and VSSOP-8 compatibility.
Availability
TPS61085PWG4 is available at Aetrix Electronics and suitable for TFT LCD bias supplies, handheld GPS receivers, digital still camera flash drivers, and PCMCIA card power management requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for TPS61085PWG4 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 TPS61085 belongs to TI's high-frequency boost converter product line, designed specifically for portable and battery-powered applications demanding compact size, high efficiency across load range, and flexible configuration via external components.
FAQ
What is the recommended input capacitor configuration for TPS61085PWG4?
TI specifies a minimum 1 μF ceramic capacitor placed directly between IN and PGND for high-frequency bypass, plus a bulk 10 μF ceramic capacitor (16 V rating) for low-frequency filtering. This dual-capacitor approach suppresses both switching noise and input line impedance effects. The TPS61085PWG4 datasheet confirms this configuration minimizes input voltage ripple and improves stability, especially under dynamic load conditions common in handheld devices.
How does the FREQ pin affect efficiency and component selection in TPS61085PWG4 designs?
When FREQ is tied to GND, TPS61085PWG4 operates at 650 kHz-yielding higher efficiency at medium-to-heavy loads and allowing larger inductors (e.g., 6.8 µH) with lower core loss. When FREQ connects to IN, it switches at 1.2 MHz-enabling smaller inductors (e.g., 3.3 µH) and capacitors but reducing light-load efficiency by ~2–3%. The choice directly impacts BOM cost, board area, and thermal design for the TPS61085PWG4.
Can TPS61085PWG4 regulate output voltages above 12 V, and what limits its maximum?
Yes, TPS61085PWG4 supports output voltages up to 18.5 V, limited by internal overvoltage protection that disables switching if FB voltage exceeds ~1.275 V (3% above 1.238 V). To achieve 18.5 V, use R1 = 1.37 MΩ and R2 = 18.2 kΩ per the feedback equation. External component ratings-especially the Schottky diode (≥20 V VR) and output capacitors (≥25 V)-must also comply with the target output voltage.
What is the purpose of the SS pin on TPS61085PWG4, and how is it configured?
The SS (soft-start) pin on TPS61085PWG4 controls inrush current by ramping the internal current limit from 0 A to full 2.0-A limit during startup. A capacitor (typically 100 nF) between SS and PGND sets the ramp time; TPS61085PWG4 charges it at 10 μA, reaching 0.8 V in ~80 ms. Leaving SS open disables soft-start, risking high input current spikes and output overshoot-critical to configure correctly in battery-fed systems.
Does TPS61085PWG4 require external compensation, and why is it beneficial?
Yes, TPS61085PWG4 requires external compensation via the COMP pin because its transconductance error amplifier is uncommitted. Connecting a resistor and capacitor (e.g., 47 kΩ + 1.6 nF) tailors loop gain and phase margin to specific output capacitance, load dynamics, and inductor values. This flexibility allows designers to optimize transient response and stability for each unique application-unlike fixed-compensation converters that compromise across use cases.
TPS61085PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
TPS61085PWG4 FAQ
1.How can I place an order for TPS61085PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61085PWG4 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 TPS61085PWG4 reliable?
The price and inventory of TPS61085PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61085PWG4 is usually 5 days.
3.What payment methods are accepted for TPS61085PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61085PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61085PWG4?
TPS61085PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61085PWG4 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 TPS61085PWG4?
For technical support, including TPS61085PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61085PWG4 requirements.
6.How does Aetrix verify that TPS61085PWG4 is sourced from the original manufacturer or authorized distributors?
All TPS61085PWG4 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 TPS61085PWG4 meets industry standards.
7.What is the process for return or replacement of TPS61085PWG4?
All TPS61085PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS61085PWG4, 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 TPS61085PWG4 part is unused and in its original packaging.
Return procedure for TPS61085PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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