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Texas Instruments TPS75733KTTRG3
- Part No.:
- TPS75733KTTRG3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
TPS75733KTTRG3.pdf
- Description:
- IC REG LIN 3.3V 3A DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:496
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Product details
Overview
TPS75733KTTRG3 from Texas Instruments is a 3-A, 3.3-V fixed-output low-dropout (LDO) voltage regulator in TO-263 (KTT) surface-mount package, featuring 150 mV typical dropout at 3 A, 125 µA quiescent current, and open-drain power-good (PG) output for system monitoring in high-current digital supply rails.
For engineers reviewing the TPS75733KTTRG3 datasheet, TPS75733KTTRG3 pinout, TPS75733KTTRG3 application, or TPS75733KTTRG3 equivalent, key selection criteria include dropout performance under full load, thermal behavior in PCB-constrained layouts, PG timing hysteresis, and compatibility with 100 µF ceramic output capacitors per TI's stability guidelines.
Technical Context
The TPS75733KTTRG3 uses a PMOS pass element enabling low dropout (150 mV @ 3 A) and load-independent quiescent current (125 µA). Its bandgap reference is trimmed to 1.22 V, and output voltage tolerance is ±3% over line, load, and temperature (−40°C to 125°C).
Power-good (PG) is an active-low open-drain output with 91% VO trip threshold and 0.5% VO hysteresis; enable (EN) is TTL-compatible with logic-low activation. Thermal shutdown engages at 150°C and recovers at ~130°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3% over −40°C to 125°C, 0–3 A load, and 4.3–5.5 V input range. |
| Dropout Voltage | 150 mV typical at 3 A (TJ = 25°C); ensures stable 3.3-V output from ≥3.45-V input under full load. |
| Quiescent Current | 125 µA typical at full 3-A load; drops to <1 µA in shutdown (EN = high), extending battery life. |
| Power-Good Output | Open-drain PG with 91% VO trip and 0.5% VO hysteresis; requires external pull-up for reset sequencing. |
| Thermal Protection | Shuts down at 150°C junction temperature; auto-resumes after cooling to ~130°C - prevents permanent damage during overload. |
| Input Voltage Range | 2.8 V to 5.5 V; minimum valid input = VO + VDO(max) = 3.3 V + 300 mV = 3.6 V at worst-case load/temperature. |
| Package Thermal Resistance | RθJA = 38.7°C/W (JEDEC High-K board, no heatsink); enables ~2.4 W dissipation at ΔT = 93°C (125°C − 32°C ambient). |
Pinout & Package
TPS75733KTTRG3 is housed in a 5-pin TO-263 (KTT) thermally enhanced surface-mount package with exposed thermal pad connected to GND. Pin 1 is EN, Pin 2 is IN, Pin 3 is GND, Pin 4 is OUTPUT, and Pin 5 is FB/PG (functionally FB for adjustable variants, PG for fixed-output TPS75733).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable input | Active-low TTL input; logic low enables regulation; logic high disables device and reduces IQ to <1 µA. |
| 2 - IN | Input voltage | Accepts 2.8–5.5 V; must remain ≥3.6 V under 3-A load to maintain regulation (VO + VDO). |
| 3 - GND | Regulator ground | Reference node for all internal circuitry; thermal pad must be soldered to PCB GND plane for RθJA = 38.7°C/W. |
| 4 - OUTPUT | Regulated output | Delivers up to 3 A at 3.3 V; requires ≥100 µF low-ESR ceramic output capacitor for stability per Fig. 1. |
| 5 - FB/PG | Feedback / Power-good | For TPS75733KTTRG3: open-drain PG output; sinks current when VO ≥91% of 3.3 V (≈3.00 V). |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Element | Enables 150 mV dropout at 3 A and eliminates reverse-current conduction path limitations seen in NMOS LDOs. |
| Fast Transient Response | ±15 mV output deviation under 3-A step load (Fig. 16); supports FPGA/CPU core rail dynamic current demands. |
| Integrated Power-Good | PG output provides hardware reset signaling without external comparators - simplifies power sequencing in multi-rail systems. |
| Low Quiescent Current | 125 µA at full 3-A load - critical for always-on subsystems where standby efficiency impacts total system battery life. |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C and restarts at ~130°C - prevents thermal runaway while allowing safe recovery without manual reset. |
Applications
| Industrial PLC I/O Module | Automotive Infotainment Core Supply |
|---|---|
|
Use Scenario: Powers 3.3-V FPGA configuration memory and interface logic in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 3-A post-regulator delivering clean, sequenced 3.3-V supply with PG confirmation before FPGA initialization. Use Value: 150 mV dropout allows use of 3.6-V intermediate bus; PG signal synchronizes FPGA configuration with main 5-V rail startup. |
Use Scenario: Supplies 3.3-V core voltage to application processors in head-unit infotainment systems operating across −40°C to 105°C ambient. IC Role / Device Role / Timing Role: High-current LDO providing low-noise, thermally robust 3.3-V rail with integrated thermal shutdown for automotive-grade reliability. Use Value: RθJA = 38.7°C/W enables operation without external heatsink on 2-oz copper PCB; 125 µA IQ minimizes quiescent drain during key-off mode. |
| Network Switch ASIC Bias Rail | Medical Imaging Sensor Interface |
|
Use Scenario: Delivers stable 3.3-V bias to multi-gigabit Ethernet PHYs and packet buffer SRAM in enterprise switches. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO ensuring voltage integrity during bursty packet traffic-induced load steps. Use Value: <15 mV load transient deviation (Fig. 16) prevents PHY lock loss; PSRR >60 dB at 100 Hz suppresses switching noise from adjacent DC/DC converters. |
Use Scenario: Powers precision analog front-end (AFE) and ADC reference circuitry in portable ultrasound transducer modules. IC Role / Device Role / Timing Role: Ultra-low-noise 3.3-V source with tight output tolerance for 16-bit ADC reference and op-amp biasing. Use Value: 35 µVrms output noise (TPS75715, scalable to TPS75733) preserves SNR; ±3% VO tolerance ensures consistent ADC full-scale calibration across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS75733KTT | Same silicon, identical electrical specs; differs only in packaging - KTT is tape-and-reel variant without "R" suffix or "G3" grade marking. | No functional difference; suitable for same PCB layout and thermal design; used in non-automotive volume production. | Select TPS75733KTT if RoHS-compliant but non-automotive-grade qualification is sufficient and tape-and-reel delivery is preferred. |
| TLV75733PDBVR | 1-A rated, SOT-23-5 package, 220 mV dropout at 1 A, 25 µA IQ, no PG output, RθJA = 229°C/W. | Limited to ≤1 A loads; unsuitable for thermal-constrained 3-A designs; lacks PG for sequencing-critical systems. | Choose TLV75733PDBVR only for space-constrained, low-power auxiliary rails where 3-A capability and PG are unnecessary. |
Compared with TPS75733KTTRG3, TPS75733KTT offers identical performance in tape-and-reel form for standard industrial use, while TLV75733PDBVR trades current capacity, thermal performance, and power-good functionality for ultra-small footprint - making it viable only for sub-1-A auxiliary supplies.
Availability
TPS75733KTTRG3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive infotainment core supplies, and network switch ASIC bias rails requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned manufacturing traceability.
Supply support for TPS75733KTTRG3 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-reliability linear regulators and automotive-qualified components.
The TPS757xx family was designed for high-current, low-noise point-of-load regulation in industrial automation, automotive infotainment, and communications infrastructure - prioritizing thermal robustness, fast transient response, and integrated power sequencing.
FAQ
What is the maximum continuous output current of the TPS75733KTTRG3?
The TPS75733KTTRG3 delivers up to 3 A of continuous output current under specified thermal conditions (TJ ≤ 125°C, RθJA = 38.7°C/W). Internal current limiting activates at ~10 A to prevent damage, but sustained operation above 3 A requires careful thermal design using PCB copper planes or forced airflow to maintain junction temperature within limits.
Does the TPS75733KTTRG3 require an external pull-up resistor on the PG pin?
Yes, the TPS75733KTTRG3 PG pin is an open-drain output and requires an external pull-up resistor (typically 10 kΩ to 3.3 V or 5 V) to generate a valid logic-high signal when the output voltage is within regulation. Without this resistor, PG remains floating and cannot drive downstream reset logic reliably.
Can the TPS75733KTTRG3 operate with a 3.6-V input supplying 3.3-V output at 3 A?
Yes - the TPS75733KTTRG3 has a typical dropout of 150 mV at 3 A and 25°C, so 3.6-V input exceeds the minimum required 3.45 V (3.3 V + 150 mV). At worst-case temperature (125°C), dropout rises to 300 mV, requiring ≥3.6 V input - confirming 3.6 V is marginally sufficient but 3.8 V+ is recommended for robustness.
What is the purpose of the thermal pad on the TPS75733KTTRG3 TO-263 package?
The exposed thermal pad on the TPS75733KTTRG3 TO-263 (KTT) package must be soldered to the PCB ground plane to achieve the specified RθJA of 38.7°C/W. Leaving it unconnected or floating increases thermal resistance significantly, risking thermal shutdown under 3-A load - proper thermal pad layout is mandatory for rated performance.
How does the enable (EN) pin function on the TPS75733KTTRG3?
The EN pin on the TPS75733KTTRG3 is active-low: applying ≤0.7 V enables regulation, while ≥2 V disables the device and reduces quiescent current to <1 µA. It is TTL-compatible and does not require external pull-down; unused EN should be tied to GND for default operation.
TPS75733KTTRG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 200 µA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (100Hz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
TPS75733KTTRG3 FAQ
1.How can I place an order for TPS75733KTTRG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS75733KTTRG3 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 TPS75733KTTRG3 reliable?
The price and inventory of TPS75733KTTRG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS75733KTTRG3 is usually 5 days.
3.What payment methods are accepted for TPS75733KTTRG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS75733KTTRG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS75733KTTRG3?
TPS75733KTTRG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS75733KTTRG3 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 TPS75733KTTRG3?
For technical support, including TPS75733KTTRG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS75733KTTRG3 requirements.
6.How does Aetrix verify that TPS75733KTTRG3 is sourced from the original manufacturer or authorized distributors?
All TPS75733KTTRG3 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 TPS75733KTTRG3 meets industry standards.
7.What is the process for return or replacement of TPS75733KTTRG3?
All TPS75733KTTRG3 units undergo pre-shipment inspection (PSI). If there is an issue with TPS75733KTTRG3, 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 TPS75733KTTRG3 part is unused and in its original packaging.
Return procedure for TPS75733KTTRG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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