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Texas Instruments TPS54353PWP
- Part No.:
- TPS54353PWP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54353PWP.pdf
- Description:
- IC REG BUCK 1.5V 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
TPS54353PWP from Texas Instruments is a 1.5-V fixed-output synchronous buck PWM converter with integrated 100-mΩ high-side MOSFET, supporting 3-A continuous output current and external low-side MOSFET or diode. It operates from 4.5 V to 20 V input, features internal compensation, 180° out-of-phase synchronization, and 500 kHz default switching frequency. Used in point-of-load regulation for FPGAs and microprocessors.
For engineers reviewing the TPS54353PWP datasheet, TPS54353PWP pinout, TPS54353PWP application, or TPS54353PWP equivalent, key selection criteria include its fixed 1.5-V output, thermally enhanced 16-pin TSSOP PowerPAD package, UVLO adjustability via external resistor divider, and bidirectional SYNC functionality for multi-phase interleaving.
Technical Context
The TPS54353PWP implements a feed-forward modulator with constant 8 V/V gain across input voltage range, enabling stable transient response. Its adaptive dead-time control prevents shoot-through by sequencing LSG and PH driver turn-on based on gate voltage thresholds below 1 V.
It integrates a precision 0.891-V reference trimmed during production, error amplifier with 2 MHz unity-gain bandwidth and 1.5 mA drive capability, and internal slow-start ramping over 1150 switching cycles (2.00 ms at 500 kHz). The SYNC pin functions as output when RT is floating (default 500 kHz) or input when RT is resistor-set.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±1% (100 mA–3 A load, TJ = 25°C), enabling precise core supply for 1.5-V logic rails. |
| Input Voltage Range | 4.5 V to 20 V - supports wide industrial and computing input sources including 5 V, 12 V, and 19 V adapters. |
| Switching Frequency | Default 500 kHz (RT floating); adjustable 250–700 kHz via RT resistor - balances efficiency, size, and EMI filtering requirements. |
| Continuous Output Current | 3 A - sufficient for mid-power FPGA I/O banks or DSP peripherals without external heatsinking under typical PCB layout. |
| High-Side rDS(ON) | 100–200 mΩ @ VIN = 12 V - ensures ≥85% efficiency at 3 A/1.5 V (VI = 12 V), reducing conduction loss and thermal stress. |
| Thermal Shutdown | 165°C trip point with 7°C hysteresis - protects against sustained overload or poor airflow while enabling automatic recovery. |
| UVLO Threshold | Adjustable start/stop via external resistor divider; default 4.49 V / 3.69 V - prevents erratic startup during brownout conditions. |
Pinout & Package
TPS54353PWP uses a 16-pin HTSSOP (PWP) PowerPAD® package with exposed thermal pad soldered to PGND/AGND plane for enhanced thermal dissipation (θJA = 42.1°C/W with soldered pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2) | Input power supply | Bypassed with 10-µF ceramic capacitor; supplies high-side switch and bias regulator - requires low-ESR placement near pins. |
| UVLO (Pin 3) | Undervoltage lockout control | External resistor divider overrides default 4.49 V start threshold - enables system-level brownout protection coordination. |
| PWRGD (Pin 4) | Power-good open-drain flag | Asserts low if VSENSE < 97% of target, during thermal shutdown, overcurrent, or slow-start - used for sequenced power-up. |
| RT (Pin 5) | Frequency setting | Resistor to AGND sets 250–700 kHz; floating = 500 kHz; ground = 250 kHz - determines ripple frequency and filter component sizing. |
| SYNC (Pin 6) | Bidirectional sync I/O | Outputs falling edge 180° out-of-phase with PH rising edge when RT floating; accepts falling-edge external clock when RT resistor-set. |
| ENA (Pin 7) | Enable control | Logic-high enables operation; <0.5 V disables with reset of slow-start - compatible with open-drain microcontroller GPIO. |
| COMP (Pin 8) | Error amplifier output | Internal node - no external connection permitted; connects to feedback network through VSENSE for loop compensation. |
| VSENSE (Pin 9) | Feedback input | Inverting input of error amp; compares output voltage to 0.891-V reference - sets regulation accuracy and stability margin. |
| AGND (Pin 10) | Analog ground reference | Internally connected to sensitive analog circuitry; must be tied to PGND and PowerPAD to minimize noise coupling into feedback path. |
| PGND (Pin 11) | Power ground return | Carries high di/dt currents from LSG driver; shared with AGND and PowerPAD - critical for minimizing ground bounce in switching node. |
| VBIAS (Pin 12) | Internal 7.8-V bias supply | Powers analog circuits and LSG driver; requires 1.0-µF X7R/X5R ceramic bypass - insufficient capacitance causes instability or driver failure. |
| LSG (Pin 13) | Low-side gate driver output | 100-mA source/sink capable; directly drives n-channel MOSFET gate - no series resistor allowed to preserve fast edge rates. |
| PH (Pins 14, 15) | Phase node connection | Connects to LC output filter inductor; carries full switching current - layout must minimize loop area to reduce EMI and voltage spikes. |
| BOOT (Pin 16) | Bootstrap capacitor node | Requires 0.1-µF ceramic cap to PH - sustains high-side gate drive above VIN during duty cycle; improper sizing causes dropout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mΩ high-side MOSFET | Eliminates external high-side switch, reduces BOM count, and improves efficiency at 3-A load without discrete driver complexity. |
| 180° out-of-phase synchronization | Enables dual-phase interleaving with second TPS5435x device using single SYNC line - cuts input ripple current by ~30% and halves required input capacitance. |
| Internally compensated control loop | Removes need for external compensation components (e.g., Type II/III networks), simplifying design and improving consistency across production units. |
| Adjustable undervoltage lockout (UVLO) | Allows system-level coordination of power sequencing by overriding default 4.49 V start threshold via external resistor divider. |
| Feed-forward modulator with constant 8 V/V gain | Maintains consistent loop dynamics across input voltage range - delivers predictable transient response regardless of VIN variation. |
Applications
| FPGA Core Supply | DSP Point-of-Load Regulation |
|---|---|
|
Use Scenario: Providing stable 1.5-V rail to Xilinx Spartan-6 or Intel Cyclone IV FPGA core logic under dynamic load transients up to 2 A/µs. IC Role / Device Role / Timing Role: Synchronous buck controller delivering regulated DC output; manages phase node switching, current sensing, and power-good signaling. Use Value: Internal 100-mΩ MOSFET and feed-forward modulation ensure <5% output deviation during 0–3-A step loads, meeting FPGA core voltage tolerance. |
Use Scenario: Generating clean 1.5-V supply for TI C6000 DSP I/O banks in industrial motor control systems with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter with synchronized switching to reduce conducted emissions in dense PCB layouts. Use Value: 500 kHz default frequency and 180° interleaving capability allow compact 2.2-µH inductors and 22-µF ceramic output caps while passing CISPR-22 Class B. |
| LCD Monitor Logic Rail | Computer Peripheral Power |
|
Use Scenario: Powering 1.5-V timing controller and interface logic in 24-inch LCD monitors operating from 12-V input bus. IC Role / Device Role / Timing Role: Primary buck regulator with PWRGD monitoring for system reset coordination and thermal fault reporting. Use Value: Integrated thermal shutdown (165°C) and power-good flag enable safe hot-plug operation and graceful shutdown during overheating events. |
Use Scenario: Supplying 1.5-V auxiliary rail to USB 3.0 hub controllers and PCIe switch logic in embedded computing platforms. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC solution in space-constrained 16-pin TSSOP PowerPAD package. Use Value: Exposed PowerPAD thermal pad achieves ≤42°C/W junction-to-ambient, allowing 3-A operation at 70°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54356PWP | Fixed 3.3-V output; identical pinout, package, and feature set except output voltage and UVLO thresholds. | Used where 3.3-V logic rail is required instead of 1.5 V - no change to PCB layout or peripheral components beyond feedback network. | Select TPS54356PWP only when 3.3-V output is needed; shares same design files, layout, and thermal profile as TPS54353PWP. |
| MP2307DN-LF-Z | Monolithic 3-A buck with fixed 1.5-V option; no SYNC, no UVLO adjustment, lower max input (23 V), and no PowerPAD thermal enhancement. | Suitable for cost-sensitive consumer applications where 180° sync and precise thermal management are not required. | Choose MP2307DN-LF-Z for simpler, lower-cost designs lacking multi-phase or industrial thermal demands - verify layout thermal performance independently. |
Compared with TPS54353PWP, TPS54356PWP offers identical functionality at 3.3 V for logic rail flexibility, while MP2307DN-LF-Z trades advanced features like SYNC and PowerPAD for lower BOM cost in non-critical environments.
Availability
TPS54353PWP is available at Aetrix Electronics and suitable for FPGA core supplies, DSP point-of-load regulation, LCD monitor logic rails, and computer peripheral power requiring stable component supply across industrial temperature ranges.
Supply support for TPS54353PWP 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 TPS5435x family was designed for high-performance point-of-load applications in FPGAs, DSPs, ASICs, and microprocessors - emphasizing integration, thermal robustness, and synchronization capability in compact packages.
FAQ
What is the fixed output voltage of the TPS54353PWP?
The TPS54353PWP provides a factory-trimmed fixed output voltage of 1.5 V with ±1% tolerance over 100 mA to 3 A load current and at TJ = 25°C. This value is confirmed in the Electrical Characteristics table of the SLVS519A datasheet, and remains within ±2% across full operating temperature and line conditions.
Does the TPS54353PWP require external compensation components?
No, the TPS54353PWP is internally compensated - its control loop is optimized for stability with standard output filter configurations. No external RC networks on the COMP pin are needed, unlike many adjustable buck controllers. This simplifies layout and improves design repeatability across production batches.
Can the TPS54353PWP synchronize to an external clock signal?
Yes, the TPS54353PWP supports external synchronization via its bidirectional SYNC pin. When a resistor is connected from RT to AGND (setting frequency), SYNC becomes a falling-edge-triggered input. It accepts external clocks from 225 kHz to 770 kHz and automatically adjusts phase alignment for 180° interleaving.
What thermal performance can be expected from the TPS54353PWP in a standard PCB layout?
With the PowerPAD soldered to a 2-oz copper thermal plane (per TI's test board conditions), the TPS54353PWP achieves θJA = 42.1°C/W. At 3 A output and 12 V input, this allows continuous operation up to +70°C ambient without derating - verified by TI's efficiency curves and thermal shutdown specification (165°C trip).
How does the TPS54353PWP handle overcurrent events?
The TPS54353PWP detects overcurrent by monitoring high-side MOSFET rDS(ON) voltage. If exceeded for >100 ns, it disables the high-side switch, pulls ENA low, and initiates hiccup mode with 4.5-ms off-time (at 500 kHz). After recovery, it restarts with full internal slow-start - preventing thermal runaway during sustained overload.
TPS54353PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 250kHz, 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS54353PWP FAQ
1.How can I place an order for TPS54353PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54353PWP 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 TPS54353PWP reliable?
The price and inventory of TPS54353PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54353PWP is usually 5 days.
3.What payment methods are accepted for TPS54353PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54353PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54353PWP?
TPS54353PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54353PWP 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 TPS54353PWP?
For technical support, including TPS54353PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54353PWP requirements.
6.How does Aetrix verify that TPS54353PWP is sourced from the original manufacturer or authorized distributors?
All TPS54353PWP 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 TPS54353PWP meets industry standards.
7.What is the process for return or replacement of TPS54353PWP?
All TPS54353PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54353PWP, 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 TPS54353PWP part is unused and in its original packaging.
Return procedure for TPS54353PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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