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Texas Instruments TPS62111RSATG4
- Part No.:
- TPS62111RSATG4
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS62111RSATG4.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
TPS62111RSATG4 from Texas Instruments is a fixed-output 3.3 V, 1.5-A synchronous step-down DC-DC converter in a 16-pin VQFN (4.0 mm × 4.0 mm) package. It operates from 3.1 V to 17 V input, delivers up to 95% efficiency at 600 mA, features PFM/PWM hybrid mode for light-load efficiency, and includes power-good, low-battery detection, and external clock synchronization - used in handheld scanners and point-of-load regulation from 12-V rails.
For engineers reviewing the TPS62111RSATG4 datasheet, TPS62111RSATG4 pinout, TPS62111RSATG4 application, or TPS62111RSATG4 equivalent, key selection criteria include its fixed 3.3 V output, 1-MHz nominal switching frequency, 20 µA quiescent current in PFM mode, thermal shutdown at 145°C, and compatibility with ceramic output capacitors as small as 22 µF.
Technical Context
The TPS62111RSATG4 uses voltage-mode PWM control with input-voltage feedforward for fast line/load transient response. Its integrated N- and P-channel MOSFETs enable synchronous rectification, eliminating the need for an external diode and supporting 100% duty cycle for ultra-low dropout operation.
It supports three functional modes: forced PWM (SYNC = high), PFM/PWM auto-switching (SYNC = GND), and shutdown (EN = low). The device enters thermal shutdown at 145°C (typical), disables LBI/LBO when disabled, and asserts PG only after 250 µs delay once output reaches ≥98.4% of nominal 3.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 17 V - supports direct connection to 12-V industrial rails or multi-cell Li-ion batteries without pre-regulation. |
| Output Voltage | Fixed 3.3 V ±3% - factory-trimmed; no external feedback resistors required, simplifying layout and BOM. |
| Max Output Current | 1.5 A at VIN ≥ 6 V - sufficient for powering FPGA I/O banks, microcontroller cores, or USB PHYs. |
| Switching Frequency | 1 MHz (typical), syncable 0.8–1.4 MHz - enables use of compact 6.8 µH inductors and 22 µF ceramic output capacitors. |
| Quiescent Current | 20 µA (typical, PFM mode) - extends battery life in always-on portable devices like handheld scanners. |
| Efficiency | 92% at 12 VIN/3.3 VOUT/600 mA - reduces thermal load in space-constrained enclosures. |
| Thermal Shutdown | 145°C (typical) with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
TPS62111RSATG4 is housed in a thermally enhanced 16-pin VQFN (RSA) package measuring 4.0 mm × 4.0 mm with an exposed thermal pad soldered to AGND for optimal heat dissipation and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 2,3) | Power Input | Primary supply rail input (3.1–17 V); connects to bulk capacitor and must be decoupled near package. |
| VINA (Pin 8) | Analog Supply | Separate analog input for internal bias circuits; improves noise immunity and stability vs shared VIN. |
| EN (Pin 4) | Enable Control | Active-high logic input; <2 µA shutdown current when pulled low; must not be left floating. |
| SYNC (Pin 5) | Mode Selection | High = forced PWM (low-noise); Low = PFM/PWM auto-switching (high-efficiency light-load). |
| SW (Pins 14,15) | Switch Node | Connection point for external inductor; carries high dv/dt switching waveform - requires tight loop layout. |
| PGND (Pins 1,16) | Power Ground | Return path for high-current switch node; must be connected directly to inductor ground and separated from AGND. |
| AGND (Pin 9) | Analog Ground | Reference for FB, LBI, PG, and internal error amplifier; tied to PGND at single point near IC. |
| GND (Pins 11,12) | Ground | General-purpose ground connections; tied to AGND/PGND system per layout guidelines. |
| FB (Pin 10) | Feedback | Internally connected to 3.3 V reference; no external divider needed - simplifies design for fixed-output use. |
| LBI (Pin 7) | Battery Monitor Input | Monitors external battery via resistor divider; trips at 1.256 V ±1.5%; disabled when EN = low. |
| LBO (Pin 6) | Battery Alert Output | Open-drain low-battery flag; requires external pullup to VO or another rail ≤17 V. |
| PG (Pin 13) | Power-Good Flag | Open-drain output asserting high when VO ≥ 3.248 V (98.4% of 3.3 V); requires pullup to VO. |
| Exposed Pad | Thermal & Electrical | Soldered to AGND plane; provides primary thermal path and reduces junction-to-board resistance to 3.3°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| PFM/PWM Hybrid Operation | Maintains >85% efficiency down to 100 µA load by automatically switching to pulse-frequency mode at light loads. |
| 100% Duty Cycle Capability | Enables dropout as low as 3.3 V − VDS(ON), allowing regulation even when input drops to ~3.4 V (e.g., single-cell LiFePO₄). |
| Integrated Power MOSFETs | Eliminates external high-side/low-side switches; reduces component count, layout area, and EMI sources. |
| Programmable Low-Battery Detection | LBI input accepts resistor-divided battery voltage; threshold accuracy ±1.5% enables reliable end-of-discharge signaling. |
| Soft-Start with Prebias Support | Digital soft-start limits inrush current; monotonic start-up prevents reverse current into prebiased outputs. |
Applications
| Handheld Scanners | Industrial Point-of-Load |
|---|---|
Use Scenario: Battery-powered barcode scanner requiring stable 3.3 V for CMOS image sensor and ARM Cortex-M MCU during intermittent high-current decode bursts. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering regulated 3.3 V from 2–4 cell Li-ion (7.2–16.8 V); manages dynamic load steps up to 1.2 A with <100 µs transient recovery. Use Value: 95% peak efficiency and 20 µA quiescent current extend operating time between charges; PFM mode eliminates audible coil whine during standby. | Use Scenario: DIN-rail mounted PLC module deriving 3.3 V for communication interface (RS-485 transceiver, Ethernet PHY) from a noisy 12-V industrial bus. IC Role / Device Role / Timing Role: Isolated point-of-load converter with SYNC pin synchronized to system clock to avoid beat frequencies with adjacent digital circuitry. Use Value: 1-MHz fixed-frequency PWM operation (SYNC = high) ensures predictable EMI spectrum; 48.2°C/W θJA allows full 1.5-A output without heatsink in 50°C ambient. |
| Medical Handheld Devices | Test & Measurement Peripherals |
Use Scenario: Portable blood glucose meter using coin-cell or rechargeable Li-ion, where firmware updates and sensor calibration require clean, low-noise 3.3 V supply. IC Role / Device Role / Timing Role: Main power regulator with LBO monitoring battery health and PG signaling valid supply before enabling ADC and Bluetooth radio. Use Value: Open-drain PG and LBO outputs interface directly with microcontroller GPIOs; 2 µA shutdown current preserves battery charge during multi-week storage. | Use Scenario: USB-connected oscilloscope probe adapter needing precise 3.3 V for analog front-end amplifiers and FPGA configuration memory. IC Role / Device Role / Timing Role: Low-noise power source with VINA/VIN separation and ceramic capacitor compatibility minimizing output ripple (<10 mVpp). Use Value: Voltage-mode control with input feedforward achieves <50 mV undershoot on 1-A load step; 100% duty cycle supports operation down to 3.4 V input during brownout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.3 V fixed, 3-A output, 2.7–6 V input, 2.5-MHz switching, smaller 3-mm × 2-mm WSON package. | Targeted at higher-current, lower-input-voltage systems (e.g., USB PD-powered devices), not 12-V bus applications. | Select when input is ≤6 V and >2 A output is required; not suitable for 12-V input due to absolute max VIN = 6 V. |
| MP2451DT-LF-Z | 3.3 V fixed, 0.6-A output, 3.3–36 V input, 2-MHz switching, SOIC-8 package, no PG/LBO/SYNC pins. | Designed for cost-sensitive, lower-power industrial sensors; lacks battery monitoring and power-good signaling. | Select for simple, low-cost 3.3 V conversion from wide-input rails where feature set can be reduced. |
Compared with TPS62111RSATG4, TPS62130ARGTR offers higher current and frequency but cannot handle 12-V input, while MP2451DT-LF-Z supports wider input range but omits critical system-monitoring functions - making TPS62111RSATG4 optimal for 3.3 V point-of-load designs requiring integrated diagnostics and 12-V compatibility.
Availability
TPS62111RSATG4 is available at Aetrix Electronics and suitable for handheld scanners, industrial PLCs, medical handheld devices, and test & measurement peripherals requiring stable component supply across extended production lifecycles.
Supply support for TPS62111RSATG4 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 headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and logic ICs for industrial, automotive, and personal electronics markets.
The TPS6211x product line was engineered specifically for high-efficiency, low-noise point-of-load conversion in battery-powered and 12-V rail systems - emphasizing light-load efficiency, integrated protection, and system-level monitoring features like PG and LBO.
FAQ
What is the maximum output current capability of the TPS62111RSATG4 under typical operating conditions?
The TPS62111RSATG4 delivers up to 1.5 A continuous output current when input voltage is ≥6 V, as specified in the electrical characteristics table. At lower input voltages - such as 4.3 V - maximum output current drops to 1.2 A, and at 3.8 V it is limited to 500 mA. These deratings ensure safe operation within thermal and MOSFET RDS(ON) constraints. The TPS62111RSATG4 datasheet Figure 1 confirms this relationship between VIN and IO(MAX).
Does the TPS62111RSATG4 require external feedback resistors to set its output voltage?
No, the TPS62111RSATG4 does not require external feedback resistors because it is a fixed-output variant with an internally trimmed 3.3 V reference. Pin 10 (FB) is internally connected to the 3.3 V regulation node, unlike the adjustable TPS62110/TPS62113 which require external resistor dividers. This eliminates component count, layout complexity, and tolerance-induced output errors - a key differentiator confirmed in the Device Comparison Table of the TPS6211x datasheet.
How does the SYNC pin affect the operating mode and efficiency of the TPS62111RSATG4?
The SYNC pin on the TPS62111RSATG4 controls the converter's modulation scheme: tying SYNC high forces fixed-frequency PWM mode for low-noise operation, while pulling SYNC low enables automatic PFM/PWM mode to maximize light-load efficiency. In PFM mode, quiescent current drops to 20 µA (typical), whereas PWM-only operation maintains constant 1-MHz switching regardless of load. The datasheet explicitly states that external clock synchronization (0.8–1.4 MHz) disables PFM mode entirely - a critical detail for EMI-sensitive designs.
Can the TPS62111RSATG4 safely start up into a prebiased output voltage?
Yes, the TPS62111RSATG4 supports monotonic prebiased start-up. Its internal soft-start circuit prevents reverse current flow by inhibiting the N-channel MOSFET until the internal voltage ramp exceeds the existing output voltage. This behavior is documented in Section 9.4.2 of the datasheet and verified in typical application schematics. It ensures safe power sequencing in systems where the 3.3 V rail may already be held up by backup supplies or other regulators when TPS62111RSATG4 is enabled.
What thermal performance can be expected from the TPS62111RSATG4 in a standard 2-layer PCB layout?
In a standard 2-layer PCB with the exposed thermal pad soldered to a 1-in² AGND copper pour, the TPS62111RSATG4 exhibits a junction-to-ambient thermal resistance (θJA) of 48.2°C/W. At 1.5-A load and 12-V input, power dissipation is ~0.75 W, resulting in ~36°C junction-to-ambient rise above ambient - well below the 125°C maximum operating junction temperature. The datasheet Thermal Information table (Section 8.4) and Layout Guidelines (Section 12) confirm this performance assumes minimum recommended copper area and via count beneath the thermal pad.
TPS62111RSATG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
TPS62111RSATG4 FAQ
1.How can I place an order for TPS62111RSATG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62111RSATG4 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 TPS62111RSATG4 reliable?
The price and inventory of TPS62111RSATG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62111RSATG4 is usually 5 days.
3.What payment methods are accepted for TPS62111RSATG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62111RSATG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62111RSATG4?
TPS62111RSATG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62111RSATG4 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 TPS62111RSATG4?
For technical support, including TPS62111RSATG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62111RSATG4 requirements.
6.How does Aetrix verify that TPS62111RSATG4 is sourced from the original manufacturer or authorized distributors?
All TPS62111RSATG4 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 TPS62111RSATG4 meets industry standards.
7.What is the process for return or replacement of TPS62111RSATG4?
All TPS62111RSATG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS62111RSATG4, 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 TPS62111RSATG4 part is unused and in its original packaging.
Return procedure for TPS62111RSATG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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