My Inquiry
My Account
Texas Instruments TPS5403DR
- Part No.:
- TPS5403DR
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS5403DR.pdf
- Description:
- IC REG BUCK 3.3V 1.7A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,759
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS5403DR from Texas Instruments is a non-synchronous step-down DC/DC regulator with integrated 120-mΩ high-side N-channel MOSFET, fixed 3.3-V output, 4.5–28-V input range, and 1.7-A continuous output current. It implements peak current-mode control, pulse-skipping mode for light-load efficiency, and frequency spread spectrum to reduce EMI-used in distributed power systems for consumer electronics and industrial equipment.
For engineers reviewing the TPS5403DR datasheet, TPS5403DR pinout, TPS5403DR application, or TPS5403DR equivalent, key selection criteria include its SOIC-8 package, programmable switching frequency (70 kHz to 1.1 MHz), thermal shutdown at 165°C, cycle-by-cycle overcurrent protection, and external soft-start capability via SS pin.
Technical Context
The TPS5403DR uses constant-frequency peak current-mode control with internal slope compensation to stabilize operation above 50% duty cycle and simplify loop compensation. Its error amplifier features 92 µA/V transconductance and supports external frequency compensation via the COMP pin.
Switching frequency is set by an external resistor on ROSC or fixed at 70 kHz (ROSC grounded) or 120 kHz (ROSC open). During short-circuit events, frequency foldback reduces fSW to 1/8th nominal value as VSENSE drops below 0.825 V, limiting inductor current runaway while maintaining regulation recovery capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 28 V - supports wide-range industrial and automotive supply rails without pre-regulation. |
| Output Voltage | Fixed 3.3 V ±3% - precision reference enables direct powering of 3.3-V logic, microcontrollers, and peripherals. |
| Max Output Current | 1.7 A continuous - sufficient for mid-power digital subsystems including set-top boxes and CPE equipment. |
| Switching Frequency | 70 kHz (ROSC = GND) to 1.1 MHz (ROSC = resistor) - adjustable trade-off between efficiency, size, and EMI performance. |
| Efficiency @ 10 mA | >80% - pulse-skipping mode minimizes quiescent loss in battery-backed or standby applications. |
| Thermal Shutdown | 165°C trip point - protects against sustained overload or poor PCB thermal design without requiring external sensing. |
| High-Side RDS(on) | 120 mΩ typical - reduces conduction loss and simplifies thermal management in compact layouts. |
Pinout & Package
TPS5403DR is housed in an 8-pin SOIC (D) package with 1.27-mm lead pitch, JEDEC MS-012 AA compliant, 1.75-mm max height, and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA = 116.7°C/W under JEDEC high-K board conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap capacitor node | Requires 0.1-µF ceramic cap between BOOT and LX to generate gate drive voltage for high-side MOSFET. |
| VIN | Main input supply | Accepts 4.5–28 V; UVLO activates at 3.5 V with 200-mV hysteresis to prevent erratic startup. |
| ROSC | Frequency programming | Connect to GND for 70-kHz default, leave open for 120-kHz, or use resistor for 50–1100-kHz tuning. |
| SS | Soft-start control | 2-µA internal current source charges external capacitor to control output ramp time (1–10 ms recommended). |
| VSENSE | Feedback input | Monitors output via resistive divider; regulates to 0.8-V internal reference for 3.3-V output (R1/R2 = 3.125). |
| COMP | Error amplifier output | Connects external RC network for loop compensation; transconductance = 92 µA/V. |
| GND | Power ground | Common return for VIN, LX, and feedback path; must be low-impedance connection to minimize noise coupling. |
| LX | Switching node | Drives external inductor; anti-ringing circuit activates at zero-crossing to suppress high-frequency LC resonance. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse skipping mode | Activates below 300-mA peak inductor current to maintain >80% efficiency at 10-mA load, reducing idle power in always-on systems. |
| Frequency spread spectrum | ±6% jitter around nominal fSW with 1/512 swing frequency - lowers EMI peak amplitude without altering average switching behavior. |
| Integrated boot diode | Eliminates need for external bootstrap diode, reducing BOM count and layout complexity in space-constrained designs. |
| LX anti-ringing circuit | Internal MOSFET connects LX to VSENSE at inductor current zero-crossing - damps parasitic ringing to meet Class B radiated EMI limits. |
| Cycle-by-cycle overcurrent protection | Clamps COMP voltage during overload, limiting peak inductor current to 2.2–3.1 A depending on VIN - prevents MOSFET failure during transient shorts. |
Applications
| Consumer Power Supplies | Industrial Distributed Power |
|---|---|
Use Scenario: Powering 3.3-V logic in home appliances and LCD displays with 12-V or 24-V wall adapters. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator delivering regulated 3.3-V rail with adjustable soft-start to avoid inrush into large capacitive loads. Use Value: Fixed 3.3-V output eliminates external feedback resistors; pulse-skipping mode maintains >80% efficiency during display standby states. | Use Scenario: Generating local 3.3-V supply from 24-V factory floor bus in PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Input-tolerant DC/DC converter providing stable output across wide line variations and temperature extremes (–40°C to 85°C). Use Value: 4.5–28-V input range accommodates brownout and surge conditions; thermal shutdown at 165°C ensures reliability in unventilated enclosures. |
| Car Entertainment Systems | Battery Charger Auxiliary Rails |
Use Scenario: Supplying 3.3-V microcontroller and audio codec in automotive infotainment head units powered from 9–16-V battery. IC Role / Device Role / Timing Role: Wide-input buck regulator with UVLO hysteresis (3.5 V ±200 mV) preventing restart oscillation during cold-crank events. Use Value: ROSC-programmable frequency allows EMI tuning to avoid AM band interference; spread spectrum further reduces conducted emissions. | Use Scenario: Providing clean 3.3-V bias for charger controller ICs and status LEDs in multi-cell Li-ion battery packs. IC Role / Device Role / Timing Role: Low-quiescent-current (100 µA) regulator operating from intermediate 5-V or 12-V charging rails. Use Value: External soft-start prevents voltage overshoot on sensitive analog circuits; overvoltage transient protection clamps output during sudden load removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-3.3 | Fixed 3.3-V output, 5-A rating, 63-mΩ high-side FET, requires external bootstrap diode, no spread spectrum. | Higher current capacity but larger solution size; lacks pulse-skipping and EMI-reduction features. | Choose LM2678-3.3 when >2-A output and higher efficiency at full load are prioritized over light-load efficiency and EMI compliance. |
| TPS54231DR | Pin-compatible upgrade with synchronous rectification, 2-A rating, 3.3-V fixed output, 4.5–28-V input, integrated low-side FET. | Enables higher efficiency across full load range; eliminates external catch diode and reduces thermal stress. | Choose TPS54231DR when upgrading legacy TPS5403DR designs for improved full-load efficiency and reduced component count. |
Compared with LM2678-3.3 and TPS54231DR, the TPS5403DR offers optimized light-load efficiency via pulse skipping and built-in EMI mitigation-making it ideal for cost-sensitive, space-constrained applications where 1.7-A output suffices and synchronous losses are less critical than standby power.
Availability
TPS5403DR is available at Aetrix Electronics and suitable for consumer electronics, industrial embedded systems, and automotive infotainment applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS5403DR 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-reliability power conversion ICs.
The TPS5403DR belongs to TI's SWIFT™ family of integrated DC/DC regulators, designed specifically for cost-effective, high-efficiency point-of-load conversion in space- and thermal-constrained applications.
FAQ
What is the maximum continuous output current supported by the TPS5403DR?
The TPS5403DR supports up to 1.7 A of continuous output current under recommended operating conditions (TA = –40°C to 85°C, VIN = 4.5 V to 28 V). This rating assumes proper PCB thermal design with θJA ≤ 116.7°C/W and adequate copper area for heat dissipation. Peak inductor current limit is 2.2–3.1 A depending on input voltage, but sustained operation above 1.7 A may trigger thermal shutdown or reduce reliability.
How does the TPS5403DR achieve high efficiency at light load conditions?
The TPS5403DR achieves high light-load efficiency through pulse skipping mode, which activates when peak inductor current falls below ~300 mA. In this mode, the COMP pin voltage is clamped at 0.5 V, disabling switching cycles until output droop demands regulation. This reduces switching losses and yields >80% efficiency at 10-mA load-critical for standby and battery-powered applications using the TPS5403DR.
Can the TPS5403DR operate with an input voltage lower than 4.5 V?
No, the TPS5403DR cannot operate reliably below 4.5 V input. Its UVLO threshold is 3.5 V with 200-mV hysteresis, but the device requires ≥4.5 V to sustain regulation and deliver rated output current. Below 4.5 V, the high-side MOSFET's RDS(on) increases significantly, causing excessive conduction loss and potential thermal shutdown. The TPS5403DR datasheet explicitly specifies 4.5 V as the minimum operating input voltage.
What is the purpose of the ROSC pin on the TPS5403DR, and how should it be configured?
The ROSC pin on the TPS5403DR sets the switching frequency: grounding it fixes fSW at 70 kHz, leaving it open sets 120 kHz, and connecting an external resistor enables tuning from 50 kHz to 1.1 MHz per the formula fSW ≈ 1.167 × 10⁶ / ROSC (kΩ). This flexibility allows designers to optimize the TPS5403DR for EMI compliance, inductor size, or efficiency-without changing the IC itself.
Does the TPS5403DR include overvoltage transient protection, and how does it function?
Yes, the TPS5403DR includes overvoltage transient protection (OVTP). When VSENSE exceeds 109% of the internal 0.8-V reference (i.e., >0.872 V), the high-side MOSFET is forced off to clamp output voltage. Recovery occurs when VSENSE falls below 107% of reference (~0.856 V). This feature protects downstream 3.3-V circuitry during load dump or fast unload transients-enhancing system robustness in the TPS5403DR-based power stage.
TPS5403DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.7A
- Frequency - Switching:
- 50kHz ~ 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS5403DR FAQ
1.How can I place an order for TPS5403DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS5403DR 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 TPS5403DR reliable?
The price and inventory of TPS5403DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS5403DR is usually 5 days.
3.What payment methods are accepted for TPS5403DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS5403DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS5403DR?
TPS5403DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS5403DR 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 TPS5403DR?
For technical support, including TPS5403DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS5403DR requirements.
6.How does Aetrix verify that TPS5403DR is sourced from the original manufacturer or authorized distributors?
All TPS5403DR 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 TPS5403DR meets industry standards.
7.What is the process for return or replacement of TPS5403DR?
All TPS5403DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS5403DR, 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 TPS5403DR part is unused and in its original packaging.
Return procedure for TPS5403DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS5403DR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
