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Texas Instruments TPS61235PRWLT
- Part No.:
- TPS61235PRWLT
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
TPS61235PRWLT.pdf
- Description:
- IC REG BOOST 5.1V 6.5A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,612
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Product details
Overview
TPS61235PRWLT 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 97% peak efficiency, integrates 14-mΩ/14-mΩ internal power switches, and supports programmable constant-current regulation via the CC pin. It is used in power banks and USB Type-C charging ports requiring high-efficiency, compact, and thermally robust DC-DC conversion.
For engineers reviewing the TPS61235PRWLT datasheet, TPS61235PRWLT pinout, TPS61235PRWLT application, or TPS61235PRWLT equivalent, key selection considerations include its fixed 5.1-V output, valley-current-mode control architecture, 1-MHz switching frequency, true input-output disconnection in shutdown, and integrated overvoltage/thermal protections - all in a 2.5-mm × 2.5-mm VQFN package.
Technical Context
The TPS61235PRWLT implements a quasi-constant on-time valley-current-mode control scheme with automatic PWM-to-PFM transition for light-load efficiency optimization. Its dual-loop regulation supports both constant-voltage (CV) and constant-current (CC) operation, where the CC loop activates when output current exceeds a resistor-programmed threshold referenced to 1.244 V at the CC pin.
It features an internal soft-start sequence with pre-charge phase (current-limited by ILIM_pre), followed by ramped voltage startup (~3 ms), plus built-in UVLO (2.2–2.3 V), OVP (5.6–5.93 V), and thermal shutdown (140 °C). The device uses a bootstrap circuit to drive the high-side rectifier switch and provides open-drain INACT load-status indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.1 V ±2% (PWM mode); enables stable USB 5-V bus regulation without external feedback resistors. |
| Max Output Current | 3.5 A at 3.3-V to 5-V conversion; sufficient for dual-port USB charging or high-power portable devices. |
| Peak Efficiency | 97% at 3.6-V input; minimizes thermal stress and extends battery runtime in space-constrained designs. |
| Switching Frequency | 1 MHz (750–1250 kHz range); allows use of small 0.7–1.3 µH inductors and low-ESR ceramic capacitors. |
| Quiescent Current | 10 µA under light load; supports ultra-low-power Always-On functions like load presence detection. |
| Shutdown Current | <1 µA; ensures near-zero battery drain during system standby or storage. |
| Internal Switch RDS(on) | 14 mΩ high-side / 14 mΩ low-side; reduces conduction loss and improves full-load efficiency vs discrete solutions. |
| Thermal Resistance | RθJA = 28.7 °C/W; enables >2 W continuous power dissipation in standard PCB layouts without forced air. |
Pinout & Package
The TPS61235PRWLT is housed in a thermally enhanced 9-pin VQFN (RWL) package measuring 2.5 mm × 2.5 mm × 0.8 mm with exposed thermal pad. Pin 1 is PGND; pin 9 is VOUT. The package supports high-density layout and efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power ground | Low-impedance return path for high-switching-current loops; must be connected directly to thermal pad and large copper pour. |
| SW (Pin 2) | Switch node | Drain connection of internal power MOSFETs; carries high di/dt ripple; requires minimal trace length and tight coupling to PGND. |
| VIN (Pin 3) | Input supply | Accepts 2.3–4.5 V from single-cell Li-Ion; connects to input capacitor bank close to PGND/SW. |
| CC (Pin 4) | Constant-current programming | Receives resistor-programmed reference (e.g., 61.9 kΩ for 2 A); monitors IOUT via 1/100,000 scaling; requires parallel 1–10 nF capacitor. |
| AGND (Pin 5) | Analog ground | Reference for FB, EN, and CC pins; must be star-connected to PGND at single point to avoid noise coupling. |
| FB (Pin 6) | Feedback input | Internally tied to VOUT in TPS61235PRWLT; no external divider needed - simplifies layout and improves CV accuracy. |
| EN (Pin 7) | Enable control | Active-high logic input (1.0 V threshold); must be terminated; external pull-down recommended to prevent floating. |
| INACT (Pin 8) | Load status indicator | Open-drain output pulled low when IOUT < 50 mA; signals "no load" condition to host controller for power-state management. |
| VOUT (Pin 9) | Regulated output | Delivers 5.1 V to downstream USB loads; connects to output capacitor bank and load decoupling network. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable constant-current output | Set via external resistor at CC pin (e.g., 124 kΩ → 1 A, 61.9 kΩ → 2 A); enables precise USB port power budgeting without external current-sense ICs. |
| True input-output disconnection | Shuts off both internal switches in shutdown; eliminates reverse current and leakage paths - critical for battery isolation and safety compliance. |
| Integrated soft-start with pre-charge | Prevents inrush current via controlled output capacitor charging (ILIMpre = 0.05–1.7 A depending on VOUT); avoids brownout during cold start. |
| Output current monitor | Provides analog voltage at CC pin proportional to IOUT (VCC = IOUT × RCC/100,000); enables real-time load telemetry and dynamic power management. |
| Overvoltage & thermal protection | OVP triggers at 5.6–5.93 V; thermal shutdown at 140 °C with 15 °C hysteresis; prevents damage during fault conditions without external components. |
| 1-MHz valley-current-mode control | Enables fast transient response and stable operation across wide VIN/VOUT ratios; eliminates need for external compensation network. |
Applications
| USB Power Bank Charging Port | USB Type-C DRP Power Delivery |
|---|---|
Use Scenario: Dual-port 5-V output stage in a portable power bank delivering up to 3.5 A total to smartphones or tablets. IC Role / Device Role / Timing Role: Primary synchronous boost regulator providing regulated 5.1 V from 3.0–4.2 V Li-ion battery; manages current sharing and load status reporting. Use Value: Eliminates need for external load switches and current-sense amplifiers; reduces BOM count by ≥4 components while maintaining ±2% output accuracy and 97% efficiency. | Use Scenario: VBUS power source in a USB Type-C device supporting Dual-Role Power (DRP) with sink capability. IC Role / Device Role / Timing Role: Fixed-output boost converter supplying 5.1 V to VBUS during source mode; coordinated with USB PD controller via EN and INACT signals. Use Value: Enables rapid VBUS ramp-up with pre-charge and accurate load detection (INACT <50 mA threshold), satisfying USB PD specification timing requirements for source initiation. |
| Battery-Powered USB Hub | Tablet PC Auxiliary Power Rail |
Use Scenario: Compact 4-port USB hub powered by internal Li-polymer battery, requiring independent 5-V rail for each downstream port. IC Role / Device Role / Timing Role: Central 5.1-V power generator feeding multiple USB load switches; uses CC pin to limit per-port current and prevent overloading. Use Value: Supports programmable per-port current limits (e.g., 900 mA/port) without individual current-limit ICs; simplifies thermal design with single high-efficiency converter. | Use Scenario: Secondary 5-V rail in a tablet PC for powering USB peripherals, display backlight drivers, or audio codecs during battery-only operation. IC Role / Device Role / Timing Role: High-current boost converter stepping up battery voltage to fixed 5.1 V; synchronized with system PMIC via EN control and INACT feedback. Use Value: Delivers 3.5 A at 97% efficiency within 6.25 mm² footprint; reduces board area vs discrete boost + LDO solutions while lowering junction temperature by >15 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61236PRWLT | Adjustable output (2.9–5.5 V) via external FB divider; identical pinout, package, and CC functionality. | Required when variable output voltage or non-5-V rails (e.g., 3.3 V, 4.5 V) are needed; not drop-in for fixed 5.1-V systems. | Select TPS61236PRWLT only if adjustable output is required; otherwise TPS61235PRWLT offers simpler layout and guaranteed 5.1-V accuracy. |
| MP28164GQ-Z | Fixed 5.0 V output; 3-A max output; 95% peak efficiency; 2.0-mm × 2.0-mm QFN; no integrated CC loop or INACT pin. | Lacks constant-current regulation and load-status reporting; suitable only for basic 5-V boost without smart power management. | Choose MP28164GQ-Z for cost-sensitive, low-feature applications where CC control and telemetry are unnecessary. |
Compared with TPS61235PRWLT, TPS61236PRWLT adds output flexibility but requires external resistors and sacrifices guaranteed 5.1-V accuracy, while MP28164GQ-Z reduces size and cost but omits critical USB power-bank features like programmable current limiting and load presence detection.
Availability
TPS61235PRWLT is available at Aetrix Electronics and suitable for power banks, USB Type-C chargers, and battery-powered USB hubs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS61235PRWLT 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 battery-powered system design.
The TPS6123x product line was designed specifically for high-current USB power delivery in portable Li-ion devices, integrating constant-current regulation, true disconnection, and thermal robustness into a miniature VQFN package.
FAQ
What is the output voltage tolerance of the TPS61235PRWLT?
The TPS61235PRWLT delivers a fixed 5.1 V output with ±2% tolerance in PWM mode (5.0–5.2 V) and 5.2 V in PFM mode. This tight regulation meets USB 2.0/3.0 VBUS specifications and eliminates the need for external feedback resistors, reducing component count and layout complexity in power bank and charger designs.
How does the TPS61235PRWLT implement constant-current regulation?
The TPS61235PRWLT implements constant-current regulation using an internal current-sense amplifier that scales output current by 1/100,000 and feeds it to the CC pin. When the voltage at the CC pin exceeds 1.244 V (set by an external resistor), the CC loop activates and reduces the inductor valley current to maintain the programmed output current - enabling precise USB port power budgeting without external sense resistors.
What is the purpose of the INACT pin on the TPS61235PRWLT?
The INACT pin on the TPS61235PRWLT is an open-drain output that pulls low when output current falls below 50 mA, signaling "no load" or "load disconnected" to the system controller. This enables intelligent power-state management in power banks and USB hubs, allowing host firmware to disable auxiliary circuits or enter low-power modes - a feature not found in standard boost converters.
Can the TPS61235PRWLT operate with input voltages below 2.3 V?
No, the TPS61235PRWLT has a minimum recommended input voltage of 2.3 V and an under-voltage lockout (UVLO) threshold of 2.2–2.3 V with 125-mV hysteresis. Operation below 2.3 V risks failure to start or unstable regulation; for Li-Ion batteries, this corresponds to ~2.5 V cell voltage - requiring careful battery fuel-gauge integration to avoid deep discharge.
Does the TPS61235PRWLT require external compensation components?
No, the TPS61235PRWLT uses internally compensated valley-current-mode control and requires no external compensation components. Its quasi-constant on-time architecture and integrated loop compensation simplify design, reduce bill-of-materials, and improve stability across input/output voltage ranges - unlike traditional voltage-mode boost controllers that demand external RC networks.
TPS61235PRWLT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-VQFN-HR (2.5x2.5)
TPS61235PRWLT FAQ
1.How can I place an order for TPS61235PRWLT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61235PRWLT 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 TPS61235PRWLT reliable?
The price and inventory of TPS61235PRWLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61235PRWLT is usually 5 days.
3.What payment methods are accepted for TPS61235PRWLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61235PRWLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61235PRWLT?
TPS61235PRWLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61235PRWLT 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 TPS61235PRWLT?
For technical support, including TPS61235PRWLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61235PRWLT requirements.
6.How does Aetrix verify that TPS61235PRWLT is sourced from the original manufacturer or authorized distributors?
All TPS61235PRWLT 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 TPS61235PRWLT meets industry standards.
7.What is the process for return or replacement of TPS61235PRWLT?
All TPS61235PRWLT units undergo pre-shipment inspection (PSI). If there is an issue with TPS61235PRWLT, 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 TPS61235PRWLT part is unused and in its original packaging.
Return procedure for TPS61235PRWLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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