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Texas Instruments TPS61091RSAR
- Part No.:
- TPS61091RSAR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS61091RSAR.pdf
- Description:
- IC REG BOOST 3.3V 2A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,925
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Product details
Overview
TPS61091RSAR from Texas Instruments is a synchronous boost DC-DC converter IC designed for single-cell Li-ion or dual-cell alkaline/NiMH battery-powered systems. It delivers up to 500 mA at 5 V output from as low as 1.8 V input, features 2-A internal switches, 600-kHz fixed-frequency PWM operation, and integrated low-battery detection with LBI/LBO pins - enabling reliable power management in portable audio and handheld computing devices.
For engineers reviewing the TPS61091RSAR datasheet, TPS61091RSAR pinout, TPS61091RSAR application, or TPS61091RSAR equivalent, key selection considerations include its 5-V fixed output, 20-µA quiescent current, 96% peak efficiency, VQFN-16 (4 × 4 mm) package with PowerPAD™ thermal pad, and support for power-save mode and external synchronization via SYNC pin.
Technical Context
The TPS61091RSAR implements a fixed-frequency, multiple feed-forward PWM controller with synchronous rectification using integrated N-channel and P-channel MOSFETs. Input voltage, output voltage, and NMOS switch voltage drop are monitored in real time to directly adjust duty cycle, minimizing error amplifier burden and improving transient response.
It integrates a 500-mV precision low-battery comparator (LBI/LBO), undervoltage lockout (~1.6 V), soft-start with precharge phase, overtemperature protection, and an antiringing switch to suppress SW-node oscillation in discontinuous conduction mode - all within a thermally enhanced 16-pin VQFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V - eliminates need for external feedback resistors and simplifies layout for stable 5-V rail generation. |
| Input Voltage Range | 1.8 V to 5.5 V - supports direct operation from single-cell Li-ion (2.5–4.2 V), two-cell alkaline/NiMH (2.0–3.2 V), or USB 5-V input with reverse polarity protection. |
| Max Output Current | 500 mA at 5 V from 1.8 V input - enables powering moderate-load peripherals (e.g., LCD bias, SD card interface, RF modules) without external pass devices. |
| Switch Current Limit | 2200 mA typical - sets safe peak inductor current limit to prevent saturation and ensure robust start-up under heavy load or low input conditions. |
| Quiescent Current | 20 µA typical - minimizes standby battery drain in always-on subsystems such as real-time clocks or wake-up logic. |
| Efficiency | Up to 96% - achieved via synchronous rectification and low RDS(on) (55 mΩ) switches, reducing conduction losses versus Schottky-based solutions. |
| Switching Frequency | 600 kHz nominal - balances inductor size (6.8 µH typical), EMI performance, and PCB area constraints for portable designs. |
Pinout & Package
TPS61091RSAR is housed in a thermally optimized 16-pin VQFN package (4.0 mm × 4.0 mm, RSA variant) with an exposed PowerPAD™ thermal pad that must be soldered to PGND for effective heat dissipation and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 11) | Enable control input | Active-high digital enable: ties to VBAT for operation; GND disables converter and disconnects load from battery. |
| VOUT (Pins 1, 15, 16) | Regulated output node | Three parallel pins reduce trace resistance/inductance and improve current handling for 500-mA output delivery. |
| PGND (Pins 5, 6, 7) | Power ground return | Dedicated high-current ground path for boost switch and rectifier - must be connected to PowerPAD™ and isolated from signal GND except at single point. |
| SW (Pins 3, 4) | Boost switch node | Internal connection point of NMOS and PMOS switches - requires low-inductance routing to inductor and minimal loop area to suppress EMI. |
| LBI (Pin 9) / LBO (Pin 12) | Low-battery monitor interface | LBI accepts scaled battery voltage; LBO provides open-drain flag - enables system-level battery health monitoring without external comparators. |
| SYNC (Pin 10) | Mode control / sync input | Logic-low enables power-save mode; logic-high forces fixed-frequency PWM; external clock input synchronizes switching to avoid beat frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | 96% peak efficiency enabled by integrated 55-mΩ NMOS/PMOS switches - eliminates Schottky forward drop and associated thermal loss. |
| Load disconnect during shutdown | True isolation of VOUT from VBAT when EN = low - prevents battery drain through output capacitors or downstream circuitry. |
| Integrated antiringing switch | Clamps SW-node ringing to VBAT during DCM - reduces radiated EMI and eliminates need for snubber networks in space-constrained layouts. |
| Power save mode (PFM) | Automatic transition from 600-kHz PWM to pulse-frequency modulation below ~10 mA load - maintains >85% efficiency down to microamp loads. |
| Thermal protection | Overtemperature shutdown at 140°C junction temperature - prevents damage during sustained overload or poor heatsinking conditions. |
Applications
| Portable Audio Devices | Handheld Computing Terminals |
|---|---|
|
Use Scenario: MP3 players and Bluetooth headsets requiring stable 5-V supply from single-cell Li-ion batteries with tight space constraints. IC Role / Device Role: Primary DC-DC boost regulator generating clean 5-V rail for DACs, amplifiers, and USB peripherals. Use Value: 20-µA quiescent current extends playback time; 96% efficiency minimizes thermal rise in sealed enclosures; LBO flag triggers low-battery UI alerts. |
Use Scenario: Industrial PDAs and barcode scanners powered by dual alkaline cells (2.0–3.2 V) needing regulated 5-V for display backlight and communication ICs. IC Role / Device Role: Input-voltage-agnostic boost converter delivering consistent 5-V output across full battery discharge curve. Use Value: 1.8-V minimum input ensures full utilization of battery capacity; SYNC pin allows EMI-sensitive timing alignment with host processor clock. |
| USB-Powered Peripherals | Medical Monitoring Sensors |
|
Use Scenario: Portable USB hubs and OTG adapters drawing power from 5-V USB ports while providing boosted 5-V output to downstream devices. IC Role / Device Role: Reverse-boost regulator maintaining 5-V output even when input dips due to cable drop or shared bus loading. Use Value: 5.5-V maximum input tolerance accommodates USB transients; load disconnect prevents backfeed into upstream port during fault conditions. |
Use Scenario: Battery-operated glucose meters and pulse oximeters requiring precise 5-V analog supply and low-power sleep modes. IC Role / Device Role: High-accuracy, low-noise power source for ADC references and op-amp signal chains. Use Value: Fixed 5-V output eliminates resistor-divider drift; 0.6% load regulation ensures stable reference voltage across sensor load variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61090RSAR | Adjustable output (1.8–5.5 V) via FB pin; same 500-mA capability and package. | Requires external resistor divider; suitable for multi-rail or dynamically reconfigurable systems. | Select TPS61090RSAR only if variable output voltage is required; TPS61091RSAR offers simpler 5-V-only implementation. |
| TPS61200DRCR | Lower 1.8–5.5 V input, 0.5-A output, but with 3-MHz switching frequency and smaller 10-pin WSON package. | Better suited for ultra-compact, high-frequency designs where inductor size is critical; lacks LBO/LBI functionality. | Choose TPS61200DRCR for space-constrained applications without battery monitoring needs; TPS61091RSAR retains full feature set in standard VQFN footprint. |
Compared with TPS61090RSAR and TPS61200DRCR, the TPS61091RSAR provides optimal balance of fixed 5-V simplicity, integrated battery monitoring, and thermal robustness in a widely supported 4×4-mm QFN - making it preferred for production-ready portable designs requiring reliability and ease of qualification.
Availability
TPS61091RSAR is available at Aetrix Electronics and suitable for portable audio devices, handheld computing terminals, and USB-powered peripherals requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across manufacturing lots.
Supply support for TPS61091RSAR 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 and battery-powered system solutions.
The TPS6109x family was engineered specifically for portable electronics demanding high efficiency across wide input ranges and intelligent battery supervision - targeting MP3 players, PDAs, and other compact, battery-critical applications.
FAQ
What is the output voltage configuration of the TPS61091RSAR?
The TPS61091RSAR features a factory-trimmed fixed 5-V output voltage. Unlike the adjustable TPS61090RSAR, it does not require external feedback resistors - simplifying design, reducing BOM count, and eliminating resistor tolerance-induced output variation. This fixed configuration ensures ±3% output accuracy over temperature and load, making the TPS61091RSAR ideal for applications requiring a stable 5-V rail without calibration overhead.
How does the TPS61091RSAR achieve 96% peak efficiency?
The TPS61091RSAR achieves 96% peak efficiency through synchronous rectification using integrated 55-mΩ N-channel and P-channel MOSFETs - replacing lossy Schottky diodes and eliminating forward voltage drop. Combined with a low-quiescent-current (20 µA) control circuit and optimized gate drive, this architecture minimizes conduction and switching losses across the 1.8–5.5 V input range, especially at medium-to-heavy loads near 500 mA.
Can the TPS61091RSAR operate with a 1.8-V input and deliver 500 mA at 5 V?
Yes, the TPS61091RSAR is explicitly rated to deliver up to 500 mA at 5 V output from a 1.8-V input, as confirmed in TI's SLVS484C datasheet Figure 1 and Table 1. This capability relies on its 2.2-A typical switch current limit and efficient synchronous topology - enabling full-load operation across the entire usable range of single-cell Li-ion and dual-cell alkaline batteries without derating.
What is the function of the LBI and LBO pins on the TPS61091RSAR?
The LBI (Low Battery Input) and LBO (Low Battery Output) pins implement an integrated battery voltage supervisor. LBI accepts a scaled-down battery voltage (e.g., via resistor divider); when it falls below 500 mV, LBO pulls low (open-drain) to signal low battery condition. This feature operates only when EN is high, and provides system-level battery health awareness without external comparators - a key differentiator of the TPS61091RSAR versus basic boost converters.
Does the TPS61091RSAR require external components for stable operation?
Yes, the TPS61091RSAR requires three essential external components: a 6.8-µH power inductor (e.g., Sumida CDRH103R-6R8), a 10-µF input ceramic capacitor (X7R/X5R), and a 100-µF low-ESR output tantalum capacitor. These values are validated in TI's reference design and ensure stable regulation, low ripple (<±3% at 500 mA), and robust transient response - deviating from them may compromise efficiency, thermal performance, or EMI compliance.
TPS61091RSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- 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):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
TPS61091RSAR FAQ
1.How can I place an order for TPS61091RSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61091RSAR 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 TPS61091RSAR reliable?
The price and inventory of TPS61091RSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61091RSAR is usually 5 days.
3.What payment methods are accepted for TPS61091RSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61091RSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61091RSAR?
TPS61091RSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61091RSAR 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 TPS61091RSAR?
For technical support, including TPS61091RSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61091RSAR requirements.
6.How does Aetrix verify that TPS61091RSAR is sourced from the original manufacturer or authorized distributors?
All TPS61091RSAR 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 TPS61091RSAR meets industry standards.
7.What is the process for return or replacement of TPS61091RSAR?
All TPS61091RSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61091RSAR, 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 TPS61091RSAR part is unused and in its original packaging.
Return procedure for TPS61091RSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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