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Texas Instruments TPS62111RSAR
- Part No.:
- TPS62111RSAR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS62111RSAR.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:26,818
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Product details
Overview
TPS62111RSAR 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 mm × 4 mm) package, operating from 3.1 V to 17 V input, delivering up to 95% efficiency at 600 mA with 20 µA quiescent current and PFM/PWM mode switching-designed for point-of-load regulation in handheld scanners and battery-powered embedded systems.
For engineers reviewing the TPS62111RSAR datasheet, TPS62111RSAR pinout, TPS62111RSAR application, or TPS62111RSAR equivalent, key selection criteria include its fixed 3.3 V output, 1 MHz nominal switching frequency, SYNC-controlled PFM/PWM mode, thermal shutdown protection, and compatibility with low-ESR ceramic output capacitors in space-constrained designs.
Technical Context
The TPS62111RSAR uses voltage-mode PWM control with input-voltage feedforward for fast line/load transient response and stable regulation across 3.1–17 V input. Its integrated N- and P-channel MOSFETs enable synchronous rectification, eliminating external diodes and reducing conduction losses.
It supports dual operational modes: forced PWM (SYNC = high) for low-noise applications, and automatic PFM/PWM transition (SYNC = low) to sustain >85% efficiency down to 100 µA load. The internal 1.153 V reference and fixed feedback network set precise 3.3 V output with ±3% tolerance over temperature and line/load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3% - eliminates external resistor divider and ensures stable rail for MCU I/O or logic interfaces. |
| Max Output Current | 1.5 A at VIN ≥ 6 V - supports moderate-power peripherals without external current boosting. |
| Input Voltage Range | 3.1 V to 17 V - accommodates 2–4-cell Li-ion batteries and standard 12 V industrial rails. |
| Switching Frequency | 1 MHz nominal (800–1400 kHz syncable) - enables compact 6.8 µH inductor and 22 µF ceramic output capacitor. |
| Quiescent Current | 20 µA typical - extends battery life in always-on or low-duty-cycle portable devices. |
| Efficiency Peak | 95% at 600 mA - minimizes thermal rise in sealed enclosures and reduces heatsinking requirements. |
| Protection Features | Overcurrent, overtemperature (145°C), undervoltage lockout (2.8–3.1 V), and power-good flag - enables robust system-level fault handling without external supervision. |
Pinout & Package
TPS62111RSAR is housed in a thermally enhanced 16-pin VQFN (RSA) package measuring 4.00 mm × 4.00 mm with an exposed thermal pad soldered to AGND for optimal power dissipation (RθJA = 48.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 2,3) | Main power input | Accepts 3.1–17 V supply; requires local 10 µF ceramic decoupling near pins. |
| VINA (Pin 8) | Analog supply input | Provides clean bias for internal reference and comparators; separate from power path. |
| EN (Pin 4) | Enable control | Active-high logic input; must be tied high or driven-floating prohibited per datasheet. |
| SW (Pins 14,15) | Power switch node | Connects to inductor; carries high di/dt switching current-requires short, low-inductance layout. |
| PGND (Pins 1,16) | Power ground return | Low-impedance return path for MOSFETs and inductor; isolated from AGND except at single-point connection. |
| AGND (Pin 9) | Analog ground | Reference for FB, LBI, PG; connects to PGND and thermal pad only at one point to avoid noise coupling. |
| FB (Pin 10) | Feedback input | Internally connected to 3.3 V divider; no external components required for fixed-output operation. |
| PG (Pin 13) | Power-good open-drain | Signals valid output (>98.4% of 3.3 V); requires external pull-up to VO for system sequencing. |
| LBI/LBO (Pins 7,6) | Low-battery monitor I/O | LBI senses battery voltage via divider; LBO asserts open-drain low when threshold (1.256 V) is crossed. |
| SYNC (Pin 5) | Frequency synchronization | CMOS-level input; high forces PWM-only mode; low enables PFM/PWM auto-transition. |
| GND (Pins 11,12) | Signal ground | Reference for EN, SYNC, PG, LBO; ties to AGND/PGND at single star point. |
| Exposed Pad | Thermal & electrical ground | Must be soldered to AGND plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| PFM/PWM auto-mode transition | Maintains >85% efficiency from 100 µA to 1.5 A load without manual mode selection or external circuitry. |
| 100% duty cycle capability | Enables dropout operation down to VOUT + 0.3 V (e.g., 3.6 V input → 3.3 V output), critical for end-of-battery-life support. |
| Integrated soft-start (1 ms typical) | Prevents input rail collapse during cold start into large output capacitance or prebiased loads. |
| Open-drain PG and LBO outputs | Enable direct interfacing with microcontroller GPIOs or FPGA power sequencing logic without level-shifting. |
| Thermal shutdown with hysteresis | Shuts down at 145°C and resumes at ~135°C, preventing thermal runaway in enclosed or high-ambient environments. |
Applications
| Handheld Scanners | Industrial Point-of-Load |
|---|---|
Use Scenario: Battery-powered barcode scanner requiring regulated 3.3 V for CMOS image sensor and ARM Cortex-M microcontroller during intermittent high-current decode bursts. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 7.4 V (2S Li-ion) to stable 3.3 V with fast transient response to handle 500 mA pulse loads. Use Value: PFM mode extends standby time between scans; 1 MHz switching allows miniature 6.8 µH inductor and eliminates audible coil whine. | Use Scenario: DIN-rail mounted PLC module drawing variable current from a 12 V backplane, needing clean 3.3 V for communication ICs and isolated I/O buffers. IC Role / Device Role / Timing Role: Secondary buck converter providing isolated, low-noise 3.3 V rail with SYNC pin locked to system clock for EMI reduction. Use Value: Forced PWM mode eliminates frequency variation; thermal shutdown protects against enclosure overheating during extended operation. |
| Medical Handheld Devices | Test & Measurement Peripherals |
Use Scenario: Portable ECG monitor powered by rechargeable Li-ion battery, where ultra-low quiescent current preserves charge during sleep mode between patient readings. IC Role / Device Role / Timing Role: System power manager delivering 3.3 V to analog front-end and BLE radio, with EN pin controlled by MCU wake signal. Use Value: 20 µA IQ enables >30-day shelf life on single charge; PG output confirms rail stability before ADC sampling begins. | Use Scenario: USB-powered oscilloscope probe with integrated signal conditioning, requiring precise 3.3 V for op-amps and ADC while rejecting noise from host PC's USB port. IC Role / Device Role / Timing Role: Local regulator decoupling noisy 5 V USB input, using separate VINA and AGND to isolate analog reference paths. Use Value: Dual-ground architecture (AGND/PGND) and 1.153 V internal reference minimize offset drift in precision analog stages. |
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 | 3.0–17 V input, adjustable 0.9–6.05 V output, 3 A max, 2.5 µA IQ, 2.2 MHz switching | Higher current, higher frequency, lower IQ - suited for denser layouts but requires external feedback resistors | Select when adjustable output or >1.5 A load is needed; not pin-compatible due to different pinout and higher switching frequency layout demands. |
| MP2451DT-LF-Z | 4.75–28 V input, fixed 3.3 V output, 0.6 A max, 260 µA IQ, 2 MHz switching, no PG/LBO | Wider input range, lower current, no power-good or battery monitor - simpler BOM but fewer system-monitoring features | Choose for cost-sensitive 12 V industrial sensors where battery monitoring and rail sequencing are unnecessary. |
Compared with TPS62111RSAR, TPS62130ARGTR offers higher output current and lower quiescent current but lacks integrated LBI/LBO and requires external feedback; MP2451DT-LF-Z provides wider input range and smaller footprint but omits critical system-monitoring functions and delivers only 0.6 A.
Availability
TPS62111RSAR is available at Aetrix Electronics and suitable for handheld scanners, industrial point-of-load regulation, and medical handheld devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS62111RSAR 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 TPS6211x product line was designed specifically for battery-powered and industrial point-of-load applications demanding high efficiency across wide load ranges, low-noise operation, and integrated system monitoring features like power-good and low-battery detection.
FAQ
What is the recommended input capacitor for TPS62111RSAR?
The TPS62111RSAR datasheet specifies a 10 µF ceramic input capacitor (X5R/X7R, 25 V rating) placed as close as possible to VIN and PGND pins. This value ensures sufficient energy storage during high di/dt switching events and maintains stability across the 3.1–17 V input range. Larger values (e.g., 22 µF) may improve ripple suppression but are not required for basic operation.
Does TPS62111RSAR support prebiased output startup?
Yes, TPS62111RSAR supports monotonic prebiased output startup. During this condition, the internal control logic prevents the N-channel MOSFET from turning on until the internal soft-start ramp exceeds the prebias voltage, avoiding reverse current flow and ensuring safe start-up into partially charged output capacitors-a key requirement in hot-swap and redundant power systems.
Can TPS62111RSAR operate without connecting the SYNC pin?
Yes, TPS62111RSAR operates autonomously at its internal 1 MHz switching frequency when SYNC is left unconnected or pulled high via a weak pullup. Leaving SYNC floating is not recommended; tie it to GND for PFM/PWM auto-mode or to VI for forced PWM. Unconnected SYNC may cause erratic mode behavior due to noise susceptibility.
What is the maximum output current of TPS62111RSAR at 5 V input?
At 5 V input, the TPS62111RSAR delivers up to 1.2 A continuous output current, as specified in the "Maximum Output Current vs Input Voltage" graph (Figure 1). This limitation arises from thermal constraints and reduced duty cycle headroom; operation above this current risks thermal shutdown unless board-level cooling is enhanced.
How does the low-battery detector function in TPS62111RSAR?
The TPS62111RSAR's low-battery detector uses the LBI pin to monitor input voltage via an external resistor divider. When LBI falls below 1.256 V ±1.5%, the open-drain LBO pin pulls low. The detector is disabled during shutdown (EN = low), and LBI must not be left floating-it should be grounded if unused. Hysteresis is internally fixed at 25 mV.
TPS62111RSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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)
TPS62111RSAR FAQ
1.How can I place an order for TPS62111RSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62111RSAR 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 TPS62111RSAR reliable?
The price and inventory of TPS62111RSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62111RSAR is usually 5 days.
3.What payment methods are accepted for TPS62111RSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62111RSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62111RSAR?
TPS62111RSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62111RSAR 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 TPS62111RSAR?
For technical support, including TPS62111RSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62111RSAR requirements.
6.How does Aetrix verify that TPS62111RSAR is sourced from the original manufacturer or authorized distributors?
All TPS62111RSAR 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 TPS62111RSAR meets industry standards.
7.What is the process for return or replacement of TPS62111RSAR?
All TPS62111RSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62111RSAR, 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 TPS62111RSAR part is unused and in its original packaging.
Return procedure for TPS62111RSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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