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Texas Instruments TPS62085RLTT
- Part No.:
- TPS62085RLTT
- Manufacturer:
- Texas Instruments
- Package:
- 7-VFDFN
- Datasheet:
-
TPS62085RLTT.pdf
- Description:
- IC REG BUCK ADJ 3A 7VSON
- Quantity:
- Payment:
- Shipping:
Inventory:8,092
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Product details
Overview
TPS62085RLTT from Texas Instruments is a 3-A synchronous step-down DC/DC converter with DCS-Control™ topology, 2.5-V to 6.0-V input range, adjustable 0.8-V to VIN output, and hiccup short-circuit protection - designed for compact battery-powered systems requiring high efficiency across light-to-heavy loads.
For engineers reviewing the TPS62085RLTT datasheet, TPS62085RLTT pinout, TPS62085RLTT application, or TPS62085RLTT equivalent, key selection considerations include its 2.4-MHz PWM switching frequency, 17-μA quiescent current in Power Save Mode, 100% duty cycle low-dropout operation, and 2-mm × 2-mm VSON-7 package with integrated power good and output discharge functionality.
Technical Context
The TPS62085RLTT implements DCS-Control™ architecture-combining voltage-mode control with seamless transition between PWM (2.4 MHz nominal) and Power Save Mode-enabling stable regulation and fast transient response without external compensation. Its internal error amplifier, direct-control timer, and fixed on-time PSM logic eliminate need for loop compensation components.
It integrates dual MOSFET power switches (31-mΩ high-side, 23-mΩ low-side RDS(on)), undervoltage lockout (2.2-V threshold), thermal shutdown (150°C), and hiccup-mode overcurrent protection triggered after 32 current-limit events. Output voltage is set via external resistor divider connected to FB and VOS pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 6.0 V - supports single-cell Li-ion, Li-polymer, and 2-cell alkaline/NiMH battery inputs. |
| Output Current | Up to 3 A continuous - enables point-of-load regulation for processors, FPGAs, and RF ICs. |
| Switching Frequency | 2.4 MHz (PWM mode) - allows use of small 0.47-µH inductors and ceramic capacitors for minimal footprint. |
| Quiescent Current | 17 µA - sustains >90% efficiency at 10-mA load, critical for always-on battery subsystems. |
| Feedback Reference | 800 mV ±8 mV - enables precise output regulation; supports 0.8-V minimum output for modern core rails. |
| Short-Circuit Protection | Hiccup mode - limits average fault current, prevents thermal runaway, and auto-recovers without host intervention. |
| Package | VSON-7 (2.0 mm × 2.0 mm, 0.5-mm pitch) - thermally enhanced exposed pad for PCB heat dissipation. |
Pinout & Package
The TPS62085RLTT is housed in a thermally optimized 7-pin VSON package (2.0 mm × 2.0 mm, 0.5-mm pitch) with an exposed thermal pad for efficient PCB heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input | Active-high logic control; internal 400-kΩ pulldown ensures safe default-off state during power-up. |
| PG (Pin 2) | Power good open-drain output | Signals valid regulation (95% VOUT) or fault (90% VOUT); requires external pullup ≤6 V for rail sequencing. |
| FB (Pin 3) | Feedback input | Senses output voltage via external resistor divider; sets regulated VOUT = 0.8 V × (1 + R1/R2). |
| VOS (Pin 4) | Output voltage sense | Direct connection to output capacitor improves load regulation and enables accurate output discharge during shutdown. |
| GND (Pin 5) | Power ground | Main return path for power stage and control circuitry; must be tied to thermal pad for optimal thermal performance. |
| SW (Pin 6) | Switch node | Connects to inductor; carries high-frequency AC current; layout critical for EMI and efficiency. |
| VIN (Pin 7) | Input power supply | Accepts 2.5–6.0 V; requires local 10-µF ceramic capacitor placed adjacent to minimize input ripple and noise. |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control™ topology | Enables single-loop control with no external compensation, achieving <1% load regulation and <2% line regulation across full operating range. |
| 100% duty cycle operation | Extends usable battery life by maintaining regulation down to VIN = VOUT + IOUT × RDS(on), e.g., 1.2 V out sustained from 1.25 V input at 3 A. |
| Output discharge function | Internal 260-Ω resistor discharges VOUT when EN is low or during fault conditions - eliminates hold-up voltage and supports safe system reset. |
| Power Save Mode (PSM) | Reduces switching frequency and quiescent current at light loads while preserving <±2.1% output accuracy with 22-µF output capacitor. |
| Hiccup short-circuit protection | Prevents thermal damage by limiting average fault current; auto-restarts after 66-µs delay - avoids latch-off and simplifies system-level fault recovery. |
Applications
| Battery-Powered Portable Devices | Processor Core Supply |
|---|---|
Use Scenario: Power management in handheld medical monitors, wireless sensors, and portable test equipment with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.2 V or 1.8 V to microcontrollers and analog front-ends. Use Value: 17-μA quiescent current extends battery runtime in sleep mode; hiccup protection prevents field failures due to accidental shorts. | Use Scenario: Core voltage supply for ARM Cortex-M4/M7 or RISC-V SoCs in edge AI modules and industrial gateways. IC Role / Device Role / Timing Role: High-current, low-noise POL converter supporting dynamic voltage scaling and rapid load transients. Use Value: DCS-Control™ delivers <10-µs transient response and <20-mV undershoot with 22-µF output capacitance - meets tight core rail specifications. |
| Hard Disk Drive (HDD) Motor & Logic Rails | Point-of-Load for FPGA I/O Banks |
Use Scenario: Dual-rail power solution in 2.5-inch HDDs where 3.3 V powers motor drivers and 1.2 V supplies controller ASIC. IC Role / Device Role / Timing Role: Secondary regulator deriving 1.2 V from 3.3 V or 5 V intermediate bus; operates in PSM during idle spin-down. Use Value: 2.4-MHz switching avoids audible noise in motor control bands; 100% duty cycle maintains logic rail during brown-out conditions. | Use Scenario: Dedicated supply for FPGA I/O banks requiring 1.8 V or 2.5 V with fast transient immunity during configuration and data streaming. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter placed adjacent to FPGA BGA package for minimal trace inductance. Use Value: 2-mm × 2-mm VSON-7 footprint fits within tight board real estate; PG output enables FPGA configuration sequencing with other rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62086RLTT | Fixed 3.3-V output; no FB/VOS divider required; identical package and pinout. | Eliminates external resistors but lacks output adjustability; suited for fixed-rail systems only. | Select when 3.3 V is required and board space for feedback network is constrained. |
| TPS62087RLTT | Fixed 1.8-V output; same thermal and electrical specs; shares all control features including PG and hiccup protection. | Optimized for processor/memory interfaces needing 1.8 V; reduces BOM count vs. adjustable version. | Choose for 1.8-V core or I/O rails where precision and simplicity outweigh adjustability needs. |
Compared with TPS62085RLTT, the TPS62086RLTT and TPS62087RLTT offer identical reliability, thermal performance, and protection features-but trade output flexibility for reduced component count and guaranteed factory-trimmed accuracy at their respective fixed voltages.
Availability
TPS62085RLTT is available at Aetrix Electronics and suitable for battery-powered portable devices, processor core supplies, hard disk drives, and FPGA point-of-load applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for TPS62085RLTT 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 company specializing in analog, embedded processing, and power management ICs, with leadership in high-efficiency DC/DC conversion and system-level power architecture.
The TPS6208x family was engineered for ultra-compact, high-efficiency power delivery in space-constrained battery-operated systems - emphasizing low quiescent current, seamless light-load efficiency, and robust fault handling without external components.
FAQ
What is the recommended output capacitor value for stable operation of the TPS62085RLTT?
The TPS62085RLTT is optimized for 22-µF ceramic output capacitance (X5R/X7R dielectric), which ensures <20-mV output ripple, fast load transient response, and stable DCS-Control™ loop behavior. Values from 10 µF to 150 µF are supported per datasheet Table 9-3, but 22 µF provides best balance of size, cost, and performance. Larger values (>150 µF) may trigger hiccup protection during startup if inrush current exceeds 4.6 A.
Does the TPS62085RLTT support pre-biased output startup?
Yes, the TPS62085RLTT supports start-up into a pre-biased output capacitor. Its internal soft-start circuitry detects the existing output voltage and ramps monotonically to the target VOUT without causing reverse current or oscillation - critical for hot-swap and multi-rail sequencing applications where downstream circuits remain powered during TPS62085RLTT enable.
How does the hiccup short-circuit protection work in the TPS62085RLTT?
The TPS62085RLTT enters hiccup mode after 32 consecutive switch current limit events (ILIM = 4.6 A typical). It then disables switching, activates the 260-Ω output discharge path via VOS, waits ~66 µs, and attempts automatic restart. This cycle repeats until the fault clears - limiting average power dissipation and preventing thermal damage without requiring external reset circuitry.
Can the TPS62085RLTT operate with 100% duty cycle, and what is the minimum input voltage for regulation?
Yes, the TPS62085RLTT supports 100% duty cycle operation to maintain regulation at ultra-low input voltages. Minimum input is calculated as VIN,MIN = VOUT + IOUT,MAX × RDS(on). For example, at 3 A and 1.2 V output, VIN,MIN ≈ 1.2 V + 3 A × 0.031 Ω = 1.293 V - enabling full battery utilization down to near-dead cell voltage.
What is the purpose of the VOS pin on the TPS62085RLTT, and how must it be connected?
On the TPS62085RLTT, the VOS (Voltage Output Sense) pin provides Kelvin sensing of the output voltage at the capacitor terminals - improving load regulation accuracy and enabling controlled output discharge during shutdown. It must be connected directly to the positive terminal of the main output capacitor, not to the SW or FB nodes, to ensure proper feedback and discharge functionality.
TPS62085RLTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- DCS-Control™
- Package/Case:
- 7-VFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 7-VSON (2x2)
TPS62085RLTT FAQ
1.How can I place an order for TPS62085RLTT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62085RLTT 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 TPS62085RLTT reliable?
The price and inventory of TPS62085RLTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62085RLTT is usually 5 days.
3.What payment methods are accepted for TPS62085RLTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62085RLTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62085RLTT?
TPS62085RLTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62085RLTT 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 TPS62085RLTT?
For technical support, including TPS62085RLTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62085RLTT requirements.
6.How does Aetrix verify that TPS62085RLTT is sourced from the original manufacturer or authorized distributors?
All TPS62085RLTT 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 TPS62085RLTT meets industry standards.
7.What is the process for return or replacement of TPS62085RLTT?
All TPS62085RLTT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62085RLTT, 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 TPS62085RLTT part is unused and in its original packaging.
Return procedure for TPS62085RLTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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