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Texas Instruments TPS61235RWLR
- Part No.:
- TPS61235RWLR
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
TPS61235RWLR.pdf
- Description:
- IC REG BOOST 5.1V 6.5A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,608
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Product details
Overview
TPS61235RWLR from Texas Instruments is a synchronous boost converter IC optimized for single-cell Li-ion/Li-polymer battery-powered USB power delivery applications. It delivers up to 3.5 A output current at 5.1 V fixed output, achieves up to 97% efficiency at 3.3-V-to-5-V conversion, integrates 14-mΩ/14-mΩ internal power switches, and supports programmable constant output current via external resistor on CC pin.
For engineers reviewing the TPS61235RWLR datasheet, TPS61235RWLR pinout, TPS61235RWLR application, or TPS61235RWLR equivalent, key selection considerations include its 2.5-mm × 2.5-mm VQFN-9 package, 1-MHz switching frequency, 10-µA light-load quiescent current, true input-output disconnection in shutdown, and integrated overvoltage, thermal, and valley-current protection.
Technical Context
The TPS61235RWLR implements valley-current-mode control with quasi-constant on-time PWM at medium/heavy loads and transitions to PFM mode under light load to maintain high efficiency. Its dual regulation loops independently manage output voltage (CV) and output current (CC), where CC is set by an external resistor on the CC pin and monitored via proportional voltage feedback.
It features integrated soft-start with pre-charge phase limiting inrush current, true input-output isolation during shutdown (<1 µA IQ), reverse-current blocking, and built-in protections including UVLO (2.3 V), OVP (5.8 V typ), and thermal shutdown (140 °C). The device operates across –40°C to 125°C junction temperature with 28.7°C/W θJA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.1 V ±2%, enabling direct USB 5-V compliance without external feedback resistors. |
| Max Output Current | 3.5 A at 3.3-V input to 5-V output, supporting high-power USB charging ports and power banks. |
| Efficiency | Up to 97% at 3.3-V-to-5-V conversion, minimizing thermal dissipation in compact portable designs. |
| Switching Frequency | 1 MHz nominal, allowing use of small 1-µH inductors and low-ESR ceramic capacitors for space-constrained layouts. |
| Quiescent Current | 10 µA under light load, enabling ultra-low standby power for always-on battery backup systems. |
| Shutdown Current | <1 µA, ensuring minimal battery drain when disabled-critical for long-term storage in portable devices. |
| Internal Switch RDS(on) | 14 mΩ high-side and 14 mΩ low-side MOSFETs, reducing conduction loss and improving full-load efficiency. |
| Package | VQFN-9 (RWL), 2.5 mm × 2.5 mm × 0.8 mm, compatible with standard reflow processes and offering excellent thermal performance (θJB = 10.9°C/W). |
Pinout & Package
TPS61235RWLR uses a 9-pin VQFN (RWL) package with wettable flanks, thermally enhanced bottom paddle connected to PGND. Pin 1 is PGND, located at bottom-left corner (top view); pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1) | Power ground reference | Low-impedance return path for high-switching-current paths; must be connected directly to PCB power plane. |
| SW (2) | Switch node | Connects to external inductor; carries high di/dt ripple current-requires short, wide trace and local decoupling. |
| VIN (3) | Input supply | Accepts 2.3 V to (VOUT − 0.6 V); minimum 2.3 V ensures reliable startup from depleted Li-ion cells. |
| CC (4) | Constant current programming & monitor | Resistor-to-ground sets IOUT limit; capacitor stabilizes loop; open or grounded disables CC function. |
| AGND (5) | Analog ground | Reference for FB, EN, INACT; must be tied to PGND at single point near IC to avoid noise coupling. |
| FB (6) | Feedback input | Internally connected to VOUT for fixed 5.1-V operation; not used externally-must not be left floating. |
| EN (7) | Enable logic input | Active-high (≥1.0 V); requires external pull-down to ensure defined state during power-up/reset. |
| INACT (8) | Load status indicator | Open-drain output pulled low when load current <50 mA; enables system-level power-state awareness. |
| VOUT (9) | Regulated output | Delivers stable 5.1 V; connects to output capacitor bank and downstream USB port or load switch. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable constant current | Set via external RCC resistor (e.g., 61.9 kΩ → 2 A); enables precise USB power delivery without external current-sense IC. |
| True input-output disconnect | Shuts off both internal FETs in shutdown, eliminating leakage paths-essential for battery longevity in standby. |
| Integrated soft-start & pre-charge | Prevents inrush current via controlled output ramp and current-limited pre-charge phase (ILIMpre = 0.25 A typ). |
| Dual-loop CV/CC regulation | Automatically transitions from voltage regulation to current regulation when load demand exceeds programmed IOUT limit. |
| Light-load PFM mode | Reduces switching frequency dynamically to maintain >85% efficiency down to 50-mA loads-ideal for intermittent USB device detection. |
| Built-in safety protections | Includes cycle-by-cycle valley-current limit (8 A typ), overvoltage lockout (5.8 V), thermal shutdown (140 °C), and UVLO (2.3 V). |
Applications
| USB Power Delivery Port | Portable Power Bank |
|---|---|
Use Scenario: Integrated into a single-port USB-A or USB-C PD sink circuit delivering regulated 5 V to smartphones or accessories. IC Role / Device Role / Timing Role: Primary synchronous boost regulator providing constant-voltage and constant-current USB-compliant output with load-status reporting. Use Value: Eliminates need for discrete load switch and current-sense amplifier, reducing BOM count by ≥3 components while maintaining USB BC1.2 compliance. | Use Scenario: Core power stage in a 10,000-mAh Li-ion power bank supplying 5 V/3 A to multiple devices simultaneously. IC Role / Device Role / Timing Role: High-efficiency boost converter stepping up 3.0–4.2 V battery voltage to fixed 5.1 V output with programmable current limiting per port. Use Value: Enables 97% peak efficiency at full load, extending usable runtime by ~12% versus typical 92% boosters, and supports true zero-quiescent shutdown. |
| Battery-Powered USB Hub | Tablet PC Auxiliary Charging |
Use Scenario: Power management IC in a bus-powered or self-powered USB 3.0 hub requiring independent 5-V rail generation for downstream ports. IC Role / Device Role / Timing Role: Regulated 5.1-V source with INACT pin signaling host controller when peripheral load drops below 50 mA (e.g., device unplugged). Use Value: Allows host firmware to enter low-power sleep mode automatically, reducing system-level idle power by up to 15 mW. | Use Scenario: Secondary charging path in a tablet design that accepts external 5-V input and boosts it to charge internal battery or power peripherals. IC Role / Device Role / Timing Role: Bidirectional-capable boost stage (with external diode) delivering 5.1 V at up to 3.5 A to USB OTG or accessory ports. Use Value: Supports simultaneous tablet operation and accessory charging without brownout, leveraging 14-mΩ internal switches for <120-mV dropout at 3 A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61236RWLR | Adjustable output (2.9–5.5 V) vs fixed 5.1 V; identical pinout, package, and CC functionality. | Required when system needs variable VOUT (e.g., QC/PD negotiation) rather than fixed USB 5 V. | Select TPS61236RWLR only if adjustable output is needed; otherwise TPS61235RWLR simplifies design with no FB resistor network. |
| MP28164GQ-Z | Fixed 5.1 V output, 3.5-A capability, but lacks CC programming pin and INACT status output; 1.2-MHz switching. | Suitable for basic USB charging where current monitoring and load-status reporting are unnecessary. | Choose MP28164GQ-Z only if CC regulation and INACT signaling are omitted from system requirements-no drop-in replacement. |
Compared with TPS61235RWLR, TPS61236RWLR offers flexibility in output voltage at the cost of added external feedback components, while MP28164GQ-Z reduces feature set to lower cost but forfeits critical USB power management functions like programmable current limit and load-status indication.
Availability
TPS61235RWLR is available at Aetrix Electronics and suitable for USB Type-C power delivery, portable power banks, and battery-powered USB hubs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for TPS61235RWLR 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 TPS6123x product line was designed specifically for high-current, battery-fed USB power delivery in portable consumer electronics-emphasizing integration, efficiency, and intelligent load management over discrete solutions.
FAQ
What is the output voltage tolerance of the TPS61235RWLR?
The TPS61235RWLR provides a fixed 5.1-V output with ±2% tolerance over temperature and line conditions, as specified in the electrical characteristics table (5.0 V to 5.2 V in PWM mode at TJ = 25°C). This tight regulation ensures compatibility with USB 2.0/3.0 host and peripheral voltage requirements without external trimming.
Can the TPS61235RWLR operate from a fully discharged Li-ion cell?
Yes-the TPS61235RWLR supports input voltages as low as 2.3 V, which corresponds to the end-of-discharge voltage of a single-cell Li-ion or Li-polymer battery. Its UVLO threshold is 2.3 V with 125-mV hysteresis, enabling reliable startup and operation down to near-empty battery states.
How does the CC pin function in the TPS61235RWLR?
The CC pin on the TPS61235RWLR serves dual roles: (1) it accepts an external resistor to program the constant output current limit (e.g., 61.9 kΩ sets 2 A), and (2) it outputs a voltage proportional to actual output current for system monitoring. A capacitor in parallel stabilizes the control loop and filters switching noise.
Does the TPS61235RWLR support automatic transition between CV and CC modes?
Yes-the TPS61235RWLR features dual independent regulation loops. When load demand stays below the programmed CC threshold, it regulates output voltage (CV mode); once load current reaches that threshold, it seamlessly transitions to constant-current (CC) regulation while allowing output voltage to droop as needed-enabling robust USB power delivery under varying loads.
What thermal performance can be expected from the TPS61235RWLR in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1-in² 2-oz copper thermal pad connected to PGND, the TPS61235RWLR exhibits a junction-to-board thermal resistance (θJB) of 10.9°C/W. At 3.5-A continuous load and 3.6-V input, typical power dissipation is ~350 mW, resulting in ~3.8°C junction rise above board temperature-well within safe operating limits.
TPS61235RWLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 4.5V
- Voltage - Output (Min/Fixed):
- 5.1V
- Voltage - Output (Max):
- -
- Current - Output:
- 6.5A (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-VQFN-HR (2.5x2.5)
TPS61235RWLR FAQ
1.How can I place an order for TPS61235RWLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61235RWLR 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 TPS61235RWLR reliable?
The price and inventory of TPS61235RWLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61235RWLR is usually 5 days.
3.What payment methods are accepted for TPS61235RWLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61235RWLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61235RWLR?
TPS61235RWLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61235RWLR 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 TPS61235RWLR?
For technical support, including TPS61235RWLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61235RWLR requirements.
6.How does Aetrix verify that TPS61235RWLR is sourced from the original manufacturer or authorized distributors?
All TPS61235RWLR 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 TPS61235RWLR meets industry standards.
7.What is the process for return or replacement of TPS61235RWLR?
All TPS61235RWLR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61235RWLR, 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 TPS61235RWLR part is unused and in its original packaging.
Return procedure for TPS61235RWLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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