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Texas Instruments TPS73HD318PWP
- Part No.:
- TPS73HD318PWP
- Manufacturer:
- Texas Instruments
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS73HD318PWP.pdf
- Description:
- IC REG LIN 1.8/3.3V 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,187
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Product details
Overview
TPS73HD318PWP from Texas Instruments is a dual-output LDO voltage regulator with fixed 3.3-V and 1.8-V outputs, designed for split-supply DSP and mixed-voltage systems. It delivers up to 750 mA per channel, features <80 mV dropout at 100 mA (3.3-V rail), 340 µA typical quiescent current per regulator, and dual active-low reset signals with 200-ms pulse width - enabling independent core/I/O reset in battery-powered embedded applications.
For engineers reviewing the TPS73HD318PWP datasheet, TPS73HD318PWP pinout, TPS73HD318PWP application, or TPS73HD318PWP equivalent, key selection criteria include dual-rail output allocation, thermal performance in PowerPAD TSSOP-28, remote sense capability on Regulator #1, and guaranteed operation across −40°C to 125°C ambient.
Technical Context
The TPS73HD318PWP integrates two independent low-dropout regulators sharing a common 28-pin PowerPAD TSSOP package: Regulator #1 provides a fixed 3.3-V output with dropout voltage as low as 44 mV at 100 mA; Regulator #2 delivers a fixed 1.8-V output with 1.2 Ω pass-element resistance at full 750 mA load and −40°C to 125°C operation.
Each regulator includes enable control (active-low), ground separation (1GND/2GND), and dedicated reset outputs (1RESET/2RESET) with 100–300 ms timeout delay. Remote feedback (1FB/SENSE) supports precise regulation at point-of-load for Regulator #1, while Regulator #2 uses internal sensing (2SENSE tied internally).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltages | 3.3 V (Regulator #1) and 1.8 V (Regulator #2), both fixed and simultaneously active |
| Max Output Current | 750 mA per regulator - enables powering DSP cores and I/O banks from single IC |
| Dropout Voltage | 44 mV typ at 100 mA (3.3-V rail); 800 mV max at 750 mA (1.8-V rail) - supports low-input headroom designs |
| Quiescent Current | 340 µA typ per regulator in active mode; 2 µA max in standby - extends battery life in portable systems |
| Reset Timeout | 200 ms nominal (100–300 ms over temperature) - ensures reliable power-on sequencing for logic and peripherals |
| Operating Temperature | −40°C to 125°C free-air range - qualified for automotive under-hood and industrial control environments |
| Package | 28-pin PowerPAD TSSOP (PWP) with exposed thermal pad - requires PCB copper pour for 1.9 W dissipation at 70°C ambient |
Pinout & Package
TPS73HD318PWP is housed in a 28-pin PowerPAD™ TSSOP (PWP) package with an exposed thermal pad on the underside for enhanced heat dissipation. Mounting requires soldering the pad to a minimum 2 in × 2 in copper area on a 1-layer board or multilayer stack-up per TI SLMA002 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1GND (Pin 3) | Regulator #1 ground reference | Separate ground return minimizes crosstalk between 3.3-V and 1.8-V domains |
| 1EN (Pin 4) | Regulator #1 enable input | Active-low control allows independent startup/shutdown of 3.3-V rail |
| 1IN (Pins 5,6) | Regulator #1 input supply | Dual pins reduce trace resistance and improve current handling for 3.3-V input path |
| 1OUT (Pins 23,24) | Regulator #1 output | Dual pins support high-current delivery and lower output impedance for 3.3-V rail |
| 1FB/SENSE (Pin 25) | Regulator #1 feedback input | Enables remote sensing to compensate for PCB IR drop - critical for stable 3.3-V regulation at load |
| 1RESET (Pin 28) | Regulator #1 reset output | Active-low open-drain signal asserts when 3.3-V rail falls below 2.868 V - used for core logic reset |
| 2GND (Pin 9) | Regulator #2 ground reference | Independent ground improves PSRR and noise isolation for sensitive 1.8-V digital I/O |
| 2EN (Pin 10) | Regulator #2 enable input | Active-low control enables staggered power-up of 1.8-V I/O relative to 3.3-V core |
| 2IN (Pins 11,12) | Regulator #2 input supply | Dual pins support robust 1.8-V input routing from shared or separate source |
| 2OUT (Pins 17,18) | Regulator #2 output | Dual pins deliver up to 750 mA to 1.8-V loads with minimized thermal stress |
| 2SENSE (Pin 19) | Regulator #2 sense input | Internally connected - no external connection required for fixed 1.8-V output |
| 2RESET (Pin 22) | Regulator #2 reset output | Active-low open-drain signal asserts when 1.8-V rail falls below 2.172 V - used for I/O subsystem reset |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | 3.3-V and 1.8-V outputs with separate enables, grounds, and reset signals - eliminates need for two discrete regulators |
| Low dropout performance | 44 mV typical dropout at 100 mA on 3.3-V rail enables operation from 3.4-V input sources - critical for Li-ion battery systems |
| Ultra-low quiescent current | 340 µA typical per regulator in active mode; 2 µA max in standby - preserves battery capacity during sleep states |
| Remote voltage sensing | 1FB/SENSE pin on Regulator #1 allows regulation accuracy at point-of-load - maintains ±1% output tolerance under dynamic load |
| Thermally enhanced packaging | PowerPAD TSSOP-28 with exposed thermal pad supports 1.9 W dissipation at 70°C ambient - enables full 750 mA per rail without derating |
Applications
| DSP Power Management | FPGA Core + I/O Supply |
|---|---|
|
Use Scenario: Powering TI C54x/C67x DSPs requiring separate 3.3-V I/O and 1.8-V core rails. IC Role / Device Role / Timing Role: Dual-LDO regulator providing sequenced, regulated supplies with independent reset assertion. Use Value: Eliminates discrete regulator count and simplifies PCB layout while meeting tight 1.8-V core tolerance (±1.2%) over temperature. |
Use Scenario: Supplying Xilinx Spartan-II FPGA with 3.3-V bank and 1.8-V core voltage. IC Role / Device Role / Timing Role: Single-package solution delivering matched transient response and synchronized reset timing for core and I/O domains. Use Value: Reduces BOM cost by 40% vs. dual discrete LDOs and ensures 200-ms reset pulse meets FPGA configuration timing requirements. |
| Automotive Infotainment | Industrial Motor Control MCU |
|
Use Scenario: Powering audio DSP and interface logic in vehicle head units operating from 12-V battery with wide temperature swing. IC Role / Device Role / Timing Role: High-temp-rated dual LDO supplying 3.3-V ADC interface and 1.8-V DSP core with independent fault detection. Use Value: −40°C to 125°C operation and dual reset outputs enable robust power sequencing in under-dash environments. |
Use Scenario: Providing isolated 3.3-V communication interface and 1.8-V microcontroller core in motor drive inverters. IC Role / Device Role / Timing Role: Dual-rail regulator with separate grounds and reset signals prevents noise coupling between analog comms and digital control logic. Use Value: 1.2 Ω pass-element resistance at 750 mA ensures stable 1.8-V supply under PWM-induced load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS73HD325PWP | Fixed 3.3-V / 2.5-V outputs instead of 3.3-V / 1.8-V; higher dropout (800 mV at 750 mA on 2.5-V rail) | Suitable for systems needing 2.5-V I/O (e.g., legacy memory interfaces) rather than 1.8-V logic | Select when 2.5-V rail is required; not interchangeable due to different output voltage setpoints and reset thresholds |
| TPS7A8300RGRT | Single-channel, 3-A adjustable LDO with 45 µVRMS noise; no second output or dual reset | Used where ultra-low noise and high current are prioritized over dual-rail integration | Choose for RF-sensitive applications requiring sub-50 µVRMS noise; requires external 1.8-V regulator for dual-rail needs |
Compared with TPS73HD318PWP, TPS73HD325PWP offers higher second-rail voltage but reduced efficiency at full load, while TPS7A8300RGRT trades integration for precision and noise performance - making TPS73HD318PWP optimal for cost-sensitive, thermally constrained dual-rail DSP systems.
Availability
TPS73HD318PWP is available at Aetrix Electronics and suitable for DSP power management, FPGA core/I/O supply, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS73HD318PWP 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 solutions with over 50 years of innovation in high-reliability IC design.
The TPS73HD3xx family was engineered specifically for DSP and mixed-signal applications demanding dual, independently controlled low-noise power rails in compact thermal packages - addressing the need for integrated, sequenced, and reset-aware power delivery.
FAQ
What are the output voltage options supported by the TPS73HD318PWP?
The TPS73HD318PWP provides fixed dual outputs: Regulator #1 delivers 3.3 V, and Regulator #2 delivers 1.8 V. These voltages are factory-programmed and not adjustable. The 3.3-V rail has ±2% tolerance over temperature (3.23 V to 3.37 V), and the 1.8-V rail maintains ±1.2% (1.728 V to 1.872 V), ensuring compatibility with standard DSP and FPGA core voltage requirements. No external resistors are needed to set either output.
How does the TPS73HD318PWP handle thermal management in high-power applications?
The TPS73HD318PWP uses a PowerPAD TSSOP-28 package with an exposed thermal pad that must be soldered to a dedicated copper pour on the PCB. With proper layout - such as a 2 in × 2 in thermal pad on a 1-layer board - it sustains 1.9 W at 70°C ambient. Derating is 23.5 mW/°C above 25°C. For higher airflow (300 CFM), power handling increases to 2.8 W at 70°C. Thermal shutdown activates at 165°C junction temperature.
Can the TPS73HD318PWP be used with different input voltage sources for each regulator?
Yes - the TPS73HD318PWP supports independent inputs: Regulator #1 accepts 3.97 V to 10 V (minimum 3.97 V for 3.3-V output), and Regulator #2 accepts 2.97 V to 10 V (minimum 2.97 V for 1.8-V output). Separate 1IN and 2IN pins allow connection to distinct power domains (e.g., buck converter for 3.3-V rail, linear pre-regulator for 1.8-V rail), improving system-level efficiency and fault isolation.
What is the function of the 1FB/SENSE and 2SENSE pins on the TPS73HD318PWP?
The 1FB/SENSE pin enables remote feedback for Regulator #1 (3.3-V rail), allowing regulation at the load to compensate for PCB trace resistance. It must be connected directly to the 3.3-V load point. In contrast, 2SENSE (for the 1.8-V rail) is internally connected and requires no external wiring - the device regulates based on its internal reference, simplifying layout for the fixed 1.8-V output.
Does the TPS73HD318PWP support power sequencing between its two outputs?
Yes - the TPS73HD318PWP supports controlled sequencing via independent enable inputs (1EN and 2EN, both active-low). By asserting 1EN before 2EN (or vice versa), designers can establish precise startup order - e.g., powering the 3.3-V I/O rail before the 1.8-V core to meet DSP boot requirements. Each regulator also features its own reset output (1RESET/2RESET), enabling independent fault signaling without cross-domain interference.
TPS73HD318PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.8V, 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -, 0.8V @ 750mA
- Current - Output:
- 750mA
- Current - Quiescent (Iq):
- 415 µA
- Current - Supply (Max):
- 550 µA
- PSRR:
- 51dB ~ 49dB (120Hz)
- Control Features:
- Enable, Reset
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
TPS73HD318PWP FAQ
1.How can I place an order for TPS73HD318PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS73HD318PWP 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 TPS73HD318PWP reliable?
The price and inventory of TPS73HD318PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS73HD318PWP is usually 5 days.
3.What payment methods are accepted for TPS73HD318PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS73HD318PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS73HD318PWP?
TPS73HD318PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS73HD318PWP 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 TPS73HD318PWP?
For technical support, including TPS73HD318PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS73HD318PWP requirements.
6.How does Aetrix verify that TPS73HD318PWP is sourced from the original manufacturer or authorized distributors?
All TPS73HD318PWP 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 TPS73HD318PWP meets industry standards.
7.What is the process for return or replacement of TPS73HD318PWP?
All TPS73HD318PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS73HD318PWP, 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 TPS73HD318PWP part is unused and in its original packaging.
Return procedure for TPS73HD318PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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