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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments TPS54383PWP

Name: TPS54383PWP
Brand: Texas Instruments
SKU: TPS54383PWP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS54383PWP

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 14-PowerTSSOP (0.173", 4.40mm Width)

Datasheet:: TPS54383PWP.pdf

Description:: IC REG BUCK ADJ 3A DL 14HTSSOP

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Product details

Overview

TPS54383 from Texas Instruments is a dual-output, non-synchronous buck converter IC with integrated 85-mΩ high-side MOSFETs per channel, 300 kHz fixed switching frequency, 4.5–28 V input range, and independent 3-A output capability per channel. It delivers regulated 0.8 V to 90% of VIN outputs for power management in multi-rail embedded systems such as digital TVs and DSP power supplies.

For engineers reviewing the TPS54383 datasheet, TPS54383 pinout, TPS54383 application, or TPS54383 equivalent, key selection considerations include its dual-channel current-mode control, 180° out-of-phase PWM operation, three-level ILIM2 programmability, ratiometric/sequential startup via SEQ pin, and internal compensation eliminating external loop components.

Technical Context

The TPS54383 implements current-mode control with internal slope compensation and fixed 300 kHz oscillator driving two independent PWM channels operating 180° out of phase to reduce input ripple. Each channel features dedicated EN, FB, BOOT, and SW pins, with shared BP regulator (5.25 V), 0.8-V ±1.5% reference, and thermal shutdown at 148°C.

Channel 1 uses fixed 4.5-A overcurrent protection, while Channel 2's ILIM2 pin selects among 4.5 A (BP), 3.0 A (floating), or 1.5 A (GND) thresholds-enabling asymmetric load optimization. Startup sequencing (ratiometric, SEQ→BP for Output2-then-Output1, or SEQ→GND for Output1-then-Output2) is controlled by a single pin without external logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 28 V - supports wide-input industrial and consumer DC supplies without pre-regulation.
Switching Frequency	300 kHz - balances efficiency, size, and EMI; enables use of standard low-cost 2.2–4.7 μH inductors.
Max Output Current	3 A per channel - sustained delivery with internal 85-mΩ MOSFETs and PowerPAD™ thermal dissipation.
Feedback Reference	0.8 V ±1.5% - precise regulation down to sub-1-V core rails; sets output via resistor divider on FB1/FB2.
Soft-Start Time	2.1 ms - internally fixed, prevents inrush current during power-up; no external capacitor required.
Overcurrent Protection	Channel 1: fixed 4.5 A; Channel 2: selectable 1.5 A / 3.0 A / 4.5 A - allows optimized component scaling for unbalanced loads.
Startup Mode Control	Single SEQ pin configures ratiometric, Output2-first, or Output1-first sequencing - eliminates external timing ICs or FPGA GPIO.

Pinout & Package

TPS54383 is housed in a 14-pin HTSSOP (PWP) package with 4.40 mm × 5.00 mm body size and exposed Thermal Pad on bottom side, requiring direct connection to PCB ground plane for thermal performance and electrical stability.

Pin/Terminal	Circuit Role	Design Meaning
PVDD1	Power input for Channel 1 high-side MOSFET	Must be bypassed locally with ≥10 μF low-ESR ceramic capacitor; independent of PVDD2 supply path.
BOOT1	Bootstrap supply for Channel 1 gate driver	Connects via 22–82 nF capacitor to SW1; internal switch charges it from BP during off-time.
SW1	Switching node for Channel 1	Drives external inductor; requires snubber network to suppress ringing due to fast MOSFET transitions.
FB1	Voltage feedback input for Channel 1	Regulates output to 0.8 V reference; resistor divider from VOUT1 to GND sets final voltage.
EN1	Active-low enable for Channel 1	Logic-low (<0.9 V) initiates soft-start; floating pulls up to PVDD2 via internal 6 μA current source.
SEQ	Startup sequencing mode selector	BP = Output2-first sequential; GND = Output1-first sequential; floating = ratiometric simultaneous start.
ILIM2	Channel 2 overcurrent threshold select	GND = 1.5 A, floating = 3.0 A, BP = 4.5 A - enables safe derating for asymmetrical load designs.
FB2	Voltage feedback input for Channel 2	Independent regulation path identical to FB1; supports different output voltages per channel.
EN2	Active-low enable for Channel 2	Functionally identical to EN1; allows independent or coordinated channel activation.
SW2	Switching node for Channel 2	180° out-of-phase with SW1 - reduces input capacitor RMS current and system-level EMI.
BOOT2	Bootstrap supply for Channel 2 gate driver	Identical function to BOOT1; requires separate 22–82 nF capacitor to SW2.
PVDD2	Main supply for control circuitry and Channel 2 MOSFET	Monitored for UVLO (4.1 V turn-on); powers EN1/EN2 pull-ups and BP regulator.
BP	5.25-V regulated supply for bootstraps	Bypass with 4.7–10 μF X7R/X5R ceramic; feeds BOOT1/BOOT2 and biases ILIM2/SEQ internal dividers.
GND	Signal and power ground	Must connect directly to Thermal Pad; forms return path for all analog and power currents.

Key Features

Feature	Design Value
Internal Compensation	Eliminates external Type-II/III compensation network - simplifies layout and reduces BOM count by 4–6 passive components per channel.
Dual PWM Outputs, 180° Out-of-Phase	Reduces input capacitor RMS current by ~30% and eases EMI filtering requirements versus in-phase dual converters.
Three-Level ILIM2 Selection	Enables optimal FET, inductor, and capacitor sizing for Channel 2 when load is ≤50% of Channel 1 - improves efficiency and cost in asymmetric applications.
2.1-ms Internal Soft-Start	Guaranteed monotonic ramp without external timing capacitor - prevents output overshoot and avoids need for external soft-start ICs.
Thermal Shutdown at 148°C	Protects against sustained overload or poor heatsinking; hysteresis ensures stable recovery after cooling (~20°C).
Ratiometric or Sequential Startup	Single-pin SEQ configuration replaces discrete logic or microcontroller sequencing - reduces design complexity and firmware dependencies.

Applications

Digital TV Power Supply	Set-Top Box Core Rails
Use Scenario: Providing independent 1.2-V CPU core and 3.3-V I/O rails from a 12-V DC bus in HD digital television platforms. IC Role / Device Role / Timing Role: Dual-channel buck controller managing two regulated outputs with tight cross-regulation and low-noise sequencing. Use Value: SEQ pin set to floating enables ratiometric startup, ensuring both rails reach regulation simultaneously to prevent latch-up in SoC power domains.	Use Scenario: Generating 5-V USB peripheral rail and 1.8-V video decoder rail from 19-V wall adapter in cable/satellite STBs. IC Role / Device Role / Timing Role: Asymmetric load manager using ILIM2=GND to set Channel 2 current limit to 1.5 A - matching lower decoder current demand. Use Value: Reduces inductor size and conduction losses on Channel 2 by 50% versus full 3-A rating, improving overall system efficiency by 1.2%.
DSP Board Power Management	Consumer Audio Amplifier Bias
Use Scenario: Delivering 1.1-V DSP core and 2.5-V memory interface rails in real-time audio processing hardware. IC Role / Device Role / Timing Role: Sequencing controller with SEQ→BP to enforce Output2 (memory) power-up before Output1 (core), satisfying SoC boot dependency. Use Value: Eliminates need for external power sequencer IC or FPGA-controlled GPIO timing, reducing board area by 22 mm² and BOM cost by $0.38.	Use Scenario: Supplying split ±15-V analog bias rails for Class-AB audio amplifier stages from a single 24-V input. IC Role / Device Role / Timing Role: Dual synchronous buck controller operating in anti-phase to minimize input ripple feeding sensitive analog circuitry. Use Value: 180° phase shift cuts input capacitor RMS current by 28%, allowing smaller 22-μF X7R instead of 47-μF, saving 3.1 mm³ volume.

Digital TV Power Supply

Set-Top Box Core Rails

Use Scenario: Providing independent 1.2-V CPU core and 3.3-V I/O rails from a 12-V DC bus in HD digital television platforms.

IC Role / Device Role / Timing Role: Dual-channel buck controller managing two regulated outputs with tight cross-regulation and low-noise sequencing.

Use Value: SEQ pin set to floating enables ratiometric startup, ensuring both rails reach regulation simultaneously to prevent latch-up in SoC power domains.

Use Scenario: Generating 5-V USB peripheral rail and 1.8-V video decoder rail from 19-V wall adapter in cable/satellite STBs.

IC Role / Device Role / Timing Role: Asymmetric load manager using ILIM2=GND to set Channel 2 current limit to 1.5 A - matching lower decoder current demand.

Use Value: Reduces inductor size and conduction losses on Channel 2 by 50% versus full 3-A rating, improving overall system efficiency by 1.2%.

DSP Board Power Management

Consumer Audio Amplifier Bias

Use Scenario: Delivering 1.1-V DSP core and 2.5-V memory interface rails in real-time audio processing hardware.

IC Role / Device Role / Timing Role: Sequencing controller with SEQ→BP to enforce Output2 (memory) power-up before Output1 (core), satisfying SoC boot dependency.

Use Value: Eliminates need for external power sequencer IC or FPGA-controlled GPIO timing, reducing board area by 22 mm² and BOM cost by $0.38.

Use Scenario: Supplying split ±15-V analog bias rails for Class-AB audio amplifier stages from a single 24-V input.

IC Role / Device Role / Timing Role: Dual synchronous buck controller operating in anti-phase to minimize input ripple feeding sensitive analog circuitry.

Use Value: 180° phase shift cuts input capacitor RMS current by 28%, allowing smaller 22-μF X7R instead of 47-μF, saving 3.1 mm³ volume.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS54386PWP	600 kHz switching frequency; otherwise identical pinout, features, and package.	Requires smaller inductors/capacitors but increases switching losses at high load; better suited for space-constrained, medium-efficiency designs.	Select TPS54386PWP only if board layout prioritizes component size over peak efficiency above 2 A per channel.
LM27402SQ/NOPB	External compensation, 500 kHz default frequency, no integrated bootstrap regulators - requires external gate drivers and compensation network.	Offers greater loop tuning flexibility but demands additional design effort and 7+ extra passives; used where dynamic load transient response is critical.	Choose LM27402SQ/NOPB only when custom loop shaping or >1-MHz operation is required; not drop-in compatible with TPS54383.

Compared with TPS54386PWP, the TPS54383 offers lower switching loss at high load but larger magnetics; versus LM27402SQ/NOPB, it trades design flexibility for rapid time-to-market and reduced BOM count - ideal for cost-sensitive, volume consumer power supplies.

Availability

TPS54383 is available at Aetrix Electronics and suitable for digital TV, set-top box, and DSP power supply applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54383 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 TPS54383 belongs to TI's TPS5438x dual-buck converter product line, designed specifically for compact, low-component-count dual-rail power supplies in consumer electronics where board space, cost, and time-to-market are critical constraints.

FAQ

What is the switching frequency of the TPS54383 and how is it set?

The TPS54383 operates at a fixed 300 kHz switching frequency determined by an internal oscillator. This frequency is not user-adjustable and does not require external timing components. It is factory-trimmed and specified from 255 kHz to 375 kHz over temperature and input voltage, enabling predictable filter design and EMI behavior without frequency drift concerns in the TPS54383 application.

How does the ILIM2 pin affect overcurrent protection on Channel 2 of the TPS54383?

The ILIM2 pin on the TPS54383 selects one of three fixed overcurrent thresholds for Channel 2: 1.5 A (when tied to GND), 3.0 A (when left floating), or 4.5 A (when tied to BP). This allows designers to scale external inductors and MOSFETs appropriately for asymmetric loads - for example, using a smaller 2.2-μH inductor rated for 2 A instead of 4 A when ILIM2=GND, reducing cost and footprint in the TPS54383 design.

Can the TPS54383 operate with different input voltages on PVDD1 and PVDD2?

Yes, the TPS54383 supports dual-supply operation: PVDD1 powers only the Channel 1 high-side MOSFET, while PVDD2 powers the control circuitry, EN pins, BP regulator, and Channel 2 MOSFET. The datasheet confirms PVDD1 and PVDD2 may differ - for instance, PVDD2=12 V for logic and Channel 2, while PVDD1=5 V for Channel 1 - enabling flexible power domain partitioning in the TPS54383 implementation.

What thermal management provisions does the TPS54383 include?

The TPS54383 integrates thermal shutdown at +148°C with 20°C hysteresis and is packaged in an HTSSOP with exposed Thermal Pad requiring solder connection to a PCB ground plane. Its junction-to-board thermal resistance (RθJB) is 25.1°C/W, and recommended layout includes ≥200 mm² copper pour under the pad. These features ensure reliable operation up to +125°C junction temperature in the TPS54383 application without forced airflow.

Is the TPS54383 pin-compatible with the TPS54386, and what is the key functional difference?

Yes, the TPS54383 and TPS54386 share identical pinout, package (HTSSOP-14), and feature set except for switching frequency: TPS54383 runs at 300 kHz, while TPS54386 runs at 600 kHz. All other parameters - including current limits, reference voltage, soft-start, and sequencing - are identical. This makes them direct drop-in alternatives where frequency selection is the sole differentiator in the TPS54383 or TPS54386 design.

TPS54383PWP Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 14-PowerTSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 2

Voltage - Input (Min):: 4.5V

Voltage - Input (Max):: 28V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 25.2V

Current - Output:: 3A

Frequency - Switching:: 310kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-HTSSOP

TPS54383PWP FAQ

1.How can I place an order for TPS54383PWP through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS54383PWP 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 TPS54383PWP reliable?

The price and inventory of TPS54383PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54383PWP is usually 5 days.

3.What payment methods are accepted for TPS54383PWP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54383PWP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS54383PWP?

TPS54383PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS54383PWP 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 TPS54383PWP?

For technical support, including TPS54383PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54383PWP requirements.

6.How does Aetrix verify that TPS54383PWP is sourced from the original manufacturer or authorized distributors?

All TPS54383PWP 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 TPS54383PWP meets industry standards.

7.What is the process for return or replacement of TPS54383PWP?

All TPS54383PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54383PWP, 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 TPS54383PWP part is unused and in its original packaging.

Return procedure for TPS54383PWP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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