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Texas Instruments TPS62111RSAT
- Part No.:
- TPS62111RSAT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS62111RSAT.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,122
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Product details
Overview
TPS62111RSAT from Texas Instruments is a fixed-output 3.3 V, 1.5-A synchronous step-down DC-DC converter in a 16-pin VQFN package, operating from 3.1 V to 17 V input, delivering up to 95% efficiency at 600 mA with 20 µA quiescent current and integrated power-good and low-battery detection - deployed in handheld scanners and point-of-load regulation from 12-V rails.
For engineers reviewing the TPS62111RSAT datasheet, TPS62111RSAT pinout, TPS62111RSAT application, or TPS62111RSAT equivalent, key selection considerations include its fixed 3.3 V output, PFM/PWM hybrid operation mode, 1 MHz nominal switching frequency, SYNC-controlled noise/efficiency trade-off, and thermal shutdown protection at 145°C.
Technical Context
The TPS62111RSAT uses voltage-mode PWM control with input-voltage feedforward for fast transient response and stable regulation across 3.1–17 V input. It integrates N- and P-channel MOSFETs with typical RDS(ON) of 145 mΩ (N) and 165 mΩ (P), enabling high-efficiency conversion without external rectifiers.
In light-load conditions, it automatically enters pulse-frequency modulation (PFM) mode via SYNC = GND, reducing quiescent current to 20 µA while maintaining regulation; forced PWM mode (SYNC = HIGH) ensures constant 1 MHz operation for low-noise applications and EMI-sensitive designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3% over full load/temperature range - eliminates external feedback resistors and simplifies layout. |
| Max Output Current | 1.5 A at VIN ≥ 6 V - supports moderate-power digital loads like microcontrollers and FPGAs. |
| Input Voltage Range | 3.1 V to 17 V - compatible with 2–4-cell Li-ion batteries and standard 12-V industrial rails. |
| Switching Frequency | 1 MHz nominal (900–1100 kHz) - enables use of compact 6.8 µH inductors and 22 µF ceramic output capacitors. |
| Quiescent Current | 20 µA typical (SYNC = GND) - extends battery life in always-on portable systems. |
| Efficiency | 92% at 12 VIN/3.3 VOUT/600 mA - minimizes thermal dissipation in space-constrained enclosures. |
| Thermal Shutdown | 145°C typical - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
TPS62111RSAT is housed in a thermally enhanced 4.00 mm × 4.00 mm, 16-pin VQFN (RSA) package with an exposed thermal pad soldered to AGND for optimal heat dissipation and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 9) | Analog ground reference | Low-noise return for internal error amplifier and compensation network - must be connected to PGND/GND with short trace. |
| EN (Pin 4) | Enable control input | Logic-high (>1.3 V) enables regulation; logic-low (<0.3 V) forces shutdown with <2 µA supply current - requires pullup if not actively driven. |
| FB (Pin 10) | Feedback node | Internally tied to 3.3 V output - no external divider needed; connects directly to VOUT for fixed-output operation. |
| PGND (Pins 1, 16) | Power ground return | High-current return path for SW node - must be routed separately from AGND and joined at single-point star ground. |
| SW (Pins 14, 15) | Switch node | Drain connection of internal P- and N-channel MOSFETs - drives external inductor; requires low-inductance layout to minimize ringing. |
| VIN (Pins 2, 3) | Main power input | Primary input rail (3.1–17 V); supplies power stage - requires local 10 µF ceramic capacitor placed near pins. |
| VINA (Pin 8) | Analog supply input | Provides bias for control circuitry - decoupled with 1 µF capacitor; may be tied to VIN if same rail used. |
| SYNC (Pin 5) | Frequency control | CMOS-level input: HIGH forces fixed-frequency PWM (low-noise); LOW enables PFM/PWM auto-switching (high-efficiency). |
| PG (Pin 13) | Power-good indicator | Open-drain output pulled high when VOUT > 98.4% of 3.3 V - requires external pullup to VOUT; invalid during first 250 µs after enable. |
| LBI/LBO (Pins 7, 6) | Low-battery monitor | LBI senses external divider; LBO asserts open-drain low when LBI < 1.256 V - disabled in shutdown; LBI must not float. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N- and P-channel MOSFETs | Eliminates need for external synchronous rectifier, reducing BOM count and board area by ~30% vs discrete solutions. |
| PFM/PWM automatic mode transition | Maintains >85% efficiency down to 100 µA load - critical for battery-powered sleep modes in handheld devices. |
| 100% duty cycle capability | Supports dropout operation as low as VOUT + 0.3 V - enables stable 3.3 V output even when input drops to 3.6 V. |
| Internal soft-start (1 ms typical) | Prevents input rail collapse during startup into large capacitive loads - avoids brownout in multi-rail systems. |
| Overcurrent and overtemperature protection | Current limit at 2.1–2.6 A and thermal shutdown at 145°C provide robust fault tolerance without external circuitry. |
Applications
| Handheld Scanners | Point-of-Load Regulation |
|---|---|
Use Scenario: Battery-powered barcode scanner requiring regulated 3.3 V for CMOS image sensor and ARM Cortex-M microcontroller during intermittent high-current bursts. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 7.2–12.6 V Li-ion pack to stable 3.3 V with fast transient response and minimal voltage droop. Use Value: 92% efficiency at 600 mA reduces heat buildup in sealed plastic housing; PFM mode extends standby time to >72 hours on 2000 mAh cell. | Use Scenario: Industrial PLC I/O module deriving 3.3 V from shared 12 V backplane rail for isolated communication interfaces and ADC front-ends. IC Role / Device Role / Timing Role: Local point-of-load converter providing low-noise, tightly regulated 3.3 V with independent enable control per subsystem. Use Value: 1 MHz switching allows small 6.8 µH inductor footprint; SYNC pin enables synchronization to system clock to avoid beat frequencies in sensitive analog sections. |
| Organizers & PDAs | Medical Handheld Devices |
Use Scenario: Legacy PDA with 3.3 V LCD controller, SD card interface, and touch controller powered from dual-cell Li-ion (6–8.4 V). IC Role / Device Role / Timing Role: Main system regulator supporting dynamic load steps from 10 mA (idle) to 1.2 A (screen refresh + SD write). Use Value: 20 µA quiescent current enables >14-day shelf life; built-in PG signal validates power integrity before firmware boot sequence. | Use Scenario: Portable ultrasound probe requiring ultra-low EMI 3.3 V supply for analog front-end and FPGA clock domain. IC Role / Device Role / Timing Role: Low-noise power source where SYNC = HIGH forces fixed 1 MHz PWM to eliminate variable-frequency noise coupling into RF receive path. Use Value: Forced PWM mode suppresses subharmonic content below 1 MHz; thermal shutdown prevents overheating during extended imaging sessions. |
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, 2.95–6 V input, 2.5 MHz switching - higher current but narrower input range. | Suitable for newer designs with 3.3 V rails fed from 5 V sources (e.g., USB-PD adapters), not 12 V or wide-input battery systems. | Select when output current >1.5 A is required and input is limited to ≤6 V; not drop-in due to different pinout and thermal pad configuration. |
| MP2315GJ-Z | 3.3 V fixed, 2-A output, 4.5–28 V input, 500 kHz switching - wider input but lower frequency and no PG/LBO features. | Better suited for cost-sensitive industrial sensors where low EMI is less critical and battery monitoring is handled externally. | Choose for 28 V max input compatibility and lower BOM cost; lacks power-good and low-battery outputs - requires external supervision circuitry. |
Compared with TPS62111RSAT, TPS62130ARGTR offers higher current but sacrifices 12-V rail compatibility and PG/LBO integration, while MP2315GJ-Z trades noise performance and feature set for broader input range and lower unit cost - making TPS62111RSAT optimal for legacy battery-powered designs needing full supervision in a compact 4×4 mm footprint.
Availability
TPS62111RSAT is available at Aetrix Electronics and suitable for handheld scanners, point-of-load regulation from 12-V buses, and medical handheld devices requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS62111RSAT 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.
The TPS6211x product line was designed specifically for portable and industrial systems requiring high-efficiency, low-noise, and feature-rich step-down regulation from wide-input battery or rail sources - targeting handheld, medical, and automation equipment.
FAQ
What is the maximum input voltage rating for the TPS62111RSAT?
The TPS62111RSAT has an absolute maximum input voltage rating of 20 V at VIN and VINA pins, but its recommended operating input voltage range is 3.1 V to 17 V. Operation above 17 V risks exceeding electrical specifications and may trigger undervoltage lockout recovery instability. Always observe the 17 V upper limit in continuous operation per TI SLVS585E datasheet Section 8.3.
Does the TPS62111RSAT require external feedback resistors for its 3.3 V output?
No, the TPS62111RSAT does not require external feedback resistors. As a fixed-output variant, its internal voltage divider is pre-configured for 3.3 V, and the FB pin is internally connected to the output. Per datasheet Section 7, FB must be connected directly to VOUT - adding external resistors will disrupt regulation and cause output deviation.
How does the SYNC pin affect efficiency and noise performance of the TPS62111RSAT?
When SYNC is pulled low (GND), the TPS62111RSAT operates in PFM/PWM hybrid mode, achieving up to 95% efficiency at light loads with 20 µA quiescent current but introducing variable switching frequency noise. When SYNC is high, it forces fixed 1 MHz PWM operation - reducing EMI peaks and improving noise predictability at the cost of slightly lower light-load efficiency.
Can the TPS62111RSAT start up into a prebiased output voltage?
Yes, the TPS62111RSAT supports monotonic prebiased start-up. Its internal soft-start circuit prevents the N-channel MOSFET from turning on until the internal ramp exceeds the existing VOUT voltage, avoiding reverse current flow. This behavior is confirmed in Section 9.4.2 of the SLVS585E datasheet and enables safe hot-plug operation in multi-rail systems.
What thermal derating applies to the TPS62111RSAT in a 4-layer PCB with 1-in² copper pour?
With a 4-layer board and 1-in² internal copper pour connected to the exposed thermal pad, the TPS62111RSAT's junction-to-board thermal resistance (ψJB) is ~16.4°C/W. At 1.5 A output and 12 V input, power dissipation is ~0.5 W; this yields ~8.2°C rise above board temperature. Full 1.5 A load is sustainable up to ~77°C ambient before reaching the 125°C max junction temperature per Section 8.3.
TPS62111RSAT 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)
TPS62111RSAT FAQ
1.How can I place an order for TPS62111RSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62111RSAT 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 TPS62111RSAT reliable?
The price and inventory of TPS62111RSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62111RSAT is usually 5 days.
3.What payment methods are accepted for TPS62111RSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62111RSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62111RSAT?
TPS62111RSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62111RSAT 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 TPS62111RSAT?
For technical support, including TPS62111RSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62111RSAT requirements.
6.How does Aetrix verify that TPS62111RSAT is sourced from the original manufacturer or authorized distributors?
All TPS62111RSAT 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 TPS62111RSAT meets industry standards.
7.What is the process for return or replacement of TPS62111RSAT?
All TPS62111RSAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62111RSAT, 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 TPS62111RSAT part is unused and in its original packaging.
Return procedure for TPS62111RSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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