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Texas Instruments TPS543820RPYR-ET
- Part No.:
- TPS543820RPYR-ET
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
TPS543820RPYR-ET.pdf
- Description:
- IC REG BUCK ADJ 8A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,419
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Product details
Overview
TPS543820RPYR-ET from Texas Instruments is an 8-A synchronous step-down DC/DC converter with internally compensated Advanced Current Mode (ACM) control, 4-V to 18-V input range, 0.5-V to 7-V output range, and selectable switching frequencies up to 2.2 MHz. It integrates 25-mΩ high-side and 6.5-mΩ low-side MOSFETs in a 2.5-mm × 3-mm VQFN-HR package and delivers ±0.5% reference accuracy over –40°C to 150°C junction temperature - enabling compact, high-efficiency power delivery in space-constrained telecom and optical networking systems.
For engineers reviewing the TPS543820RPYR-ET datasheet, TPS543820RPYR-ET pinout, TPS543820RPYR-ET application, or TPS543820RPYR-ET equivalent, key selection criteria include its fixed-frequency ACM architecture, monotonic pre-biased start-up, five programmable switching frequencies, integrated BP5 4.5-V LDO, and comprehensive fault protection including OVP/UVP/OCP/OTP/UVLO.
Technical Context
The TPS543820RPYR-ET implements an emulated peak current mode (Advanced Current Mode) control loop with internal ramp generation, eliminating need for external compensation while supporting stable operation with low-ESR MLCC output capacitors. Its three selectable PWM ramp amplitudes-set via MODE pin resistor-allow optimization of loop bandwidth and phase margin across diverse inductor and capacitor combinations.
Switching frequency is configured either by resistor on SYNC/FSEL pin (500 kHz–2.2 MHz) or synchronized to external clock (400–2600 kHz); loss-of-sync recovery defaults to internal oscillator at 70% frequency for four cycles before full reversion. The device features dual VIN pins (8 & 12), dual PGND pins (9 & 11), and dual SW pins (10 & 13) to minimize parasitic inductance and enhance thermal performance in high-current paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 18 V - supports wide-input industrial and telecom rails including 5 V, 12 V, and 15 V bus systems. |
| Output Current | 8 A continuous - enables single-chip supply for FPGA core, ASIC, or multi-core processor domains. |
| Switching Frequency | 500 kHz / 750 kHz / 1 MHz / 1.5 MHz / 2.2 MHz - selectable via resistor; higher frequencies reduce inductor size and improve transient response. |
| Reference Accuracy | ±0.5% over –40°C to +150°C - ensures tight output regulation across automotive and industrial ambient extremes. |
| MOSFET RDS(on) | 25 mΩ (HS) / 6.5 mΩ (LS) - minimizes conduction losses and enables >95% peak efficiency at 12 V → 1 V, 1 MHz. |
| Soft-Start Time | 0.5 ms / 1 ms / 2 ms / 4 ms - selectable via MODE pin resistor; prevents inrush into pre-biased loads without external circuitry. |
| Thermal Limit | 165°C shutdown with 12°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Package | 2.5-mm × 3-mm, 14-pin VQFN-HR (RPY) - HotRod™ flip-chip construction reduces parasitic inductance and improves EMI performance. |
Pinout & Package
TPS543820RPYR-ET uses a 2.5-mm × 3-mm, 14-pin VQFN-HR (RPY) package with 0.5-mm pitch and exposed thermal pad. Dual VIN, PGND, and SW pins reduce current path impedance and improve thermal dissipation in high-power buck topologies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/FSEL (1) | Frequency select & sync input | Resistor-to-AGND sets fSW; external square wave (20–80% duty) synchronizes switching - critical for noise-sensitive multi-rail systems. |
| MODE (2) | Configuration strap input | Resistor-to-AGND selects soft-start time, current limit (8-A/6-A), and PWM ramp amplitude - enables one-resistor tuning of loop dynamics. |
| PGOOD (3) | Open-drain status output | Asserts after VOUT reaches 92–95% of target and remains valid down to 0.9 V VIN - used for power sequencing and system enable. |
| FB (4) | Voltage feedback input | Connects to resistor divider midpoint; regulates output to 500 mV reference - supports 0.5–7 V outputs with <1% tolerance resistors. |
| AGND (5) | Analog ground reference | Separate return for FB, MODE, SYNC/FSEL, EN, PGOOD - isolates sensitive analog circuits from noisy power-ground currents. |
| BP5 (6) | Internal LDO output | 4.5-V regulated supply for gate drivers; requires 2.2-μF ceramic bypass to AGND - powers bootstrap circuit and enables robust high-side drive. |
| EN (7) | Enable & UVLO adjust | Float to enable; resistor divider from VIN sets custom UVLO threshold (e.g., 10 V ±150 mV) - supports brown-in/brown-out control. |
| VIN (8, 12) | Main input power | Dual pins reduce trace inductance; each requires local 10–100 nF ceramic cap to PGND - essential for stable high-frequency operation. |
| PGND (9, 11) | Power ground return | Dual low-impedance paths to source of LS FET; must connect directly to thermal pad and bulk capacitor - defines current return for power stage. |
| SW (10, 13) | Switch node output | Dual pins connect to inductor; internal connection between both SW pins lowers switching node impedance and EMI radiation. |
| BOOT (14) | High-side gate driver supply | Connected to bootstrap capacitor (typically 0.1 μF) between BOOT and SW - supplies gate voltage above SW for HS FET turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated ACM control | Eliminates external compensation network; enables stable operation with ceramic output capacitors and fast load-step response (<10 µs). |
| Selectable PWM ramp amplitude | Three ramp options (via MODE pin) optimize loop gain/phase for specific LC filter combinations - avoids instability with ultra-low-ESR caps. |
| Monotonic pre-biased start-up | Guarantees controlled voltage ramp even when output is pre-charged - prevents reverse current flow and protects downstream loads. |
| Integrated 4.5-V BP5 LDO | Provides dedicated, low-noise gate drive supply independent of input rail - ensures consistent high-side FET turn-on across input range. |
| Comprehensive fault protection | Includes output OVP/UVP, input UVLO, cycle-by-cycle OCP, hiccup-mode thermal shutdown, and BOOT-SW UVLO - enables unattended operation in harsh environments. |
| Pin-to-pin compatibility | Direct replacement for TPS543620 and TPS543320 - allows scalable power design across 6-A, 8-A, and 12-A variants without layout change. |
Applications
| Wireless Infrastructure Power | Optical Network Line Cards |
|---|---|
|
Use Scenario: Powering FPGA, DSP, and RF transceiver cores on 5G base station radio units operating at ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 0.85 V @ 6 A to FPGA core with <1% output deviation under 4-A step load. Use Value: High efficiency (>93% at 12 V → 0.85 V, 1 MHz) and 150°C max junction rating ensure reliable operation in sealed, fanless enclosures. |
Use Scenario: Generating 3.3 V and 1.2 V rails for SFP+ modules and SERDES interfaces in dense optical line cards with strict EMI limits. IC Role / Device Role / Timing Role: Dual-rail POL converter using two TPS543820RPYR-ET devices synchronized to common clock to suppress beat frequencies. Use Value: 2.2 MHz operation enables sub-1-mm height inductors; SYNC pin synchronization eliminates heterodyne noise in adjacent channels. |
| Test & Measurement Equipment | Medical Imaging Subsystems |
|
Use Scenario: Supplying precision ADCs, DACs, and clock buffers in portable spectrum analyzers requiring ultra-low noise and fast transient recovery. IC Role / Device Role / Timing Role: Low-noise 1.8 V regulator with 0.5-ms soft-start and monotonic rise - prevents digital latch-up during power-up sequencing. Use Value: Internally compensated ACM control achieves <10 µs recovery from 50% load step with <10 mV undershoot - meets metrology-grade stability requirements. |
Use Scenario: Providing isolated 5 V and 1.1 V rails for CT scanner detector ASICs where reliability and long-term calibration stability are critical. IC Role / Device Role / Timing Role: Safety-critical POL regulator with redundant OVP/UVP/OTP protection and ±0.5% reference accuracy over full temperature range. Use Value: 165°C thermal shutdown with 12°C hysteresis prevents thermal runaway; BP5 LDO decouples gate drive from input ripple - ensures consistent timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543620RPYR | 6-A rated; identical pinout, package, and feature set except lower current limit and reduced RDS(on) (30 mΩ HS / 8.5 mΩ LS). | Suitable for lower-power FPGA I/O banks or microcontroller subsystems where 6-A headroom suffices. | Select when full 8-A capability is unnecessary - offers same layout, BOM simplification, and thermal footprint at lower cost. |
| TPS543320RPYR | 12-A rated; shares pinout and control architecture but uses larger 3.5-mm × 3.5-mm RHL package with enhanced thermal performance. | Required for high-current GPU accelerators or multi-core SoCs demanding >10 A with minimal voltage droop. | Choose when future-proofing for higher current or when operating near thermal limits - same schematic, revised layout for larger package. |
Compared with TPS543820RPYR-ET, TPS543620RPYR provides identical functionality at reduced current capacity and cost, while TPS543320RPYR extends current capability with a larger thermal package - enabling scalable design across 6-A, 8-A, and 12-A power tiers using shared engineering resources.
Availability
TPS543820RPYR-ET is available at Aetrix Electronics and suitable for wireless infrastructure, optical networking, and medical imaging applications requiring stable component supply, high-temperature operation, and precise voltage regulation.
Supply support for TPS543820RPYR-ET 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 over 50 years of innovation in high-reliability power conversion.
The TPS543820RPYR-ET belongs to TI's SWIFT™ synchronous buck converter family, engineered for high-density, high-efficiency point-of-load regulation in telecom, datacom, and industrial systems where thermal performance and EMI control are critical.
FAQ
What is the maximum recommended operating junction temperature for the TPS543820RPYR-ET?
The TPS543820RPYR-ET has a maximum operating junction temperature of 150°C, with thermal shutdown triggered at 165°C (±10°C) and 12°C hysteresis. This rating enables deployment in sealed, high-ambient environments such as 5G remote radio units and optical line cards without forced airflow. Derating curves in the datasheet confirm 8-A operation is sustainable at 125°C junction under natural convection with proper PCB copper area.
How does the TPS543820RPYR-ET achieve stable operation without external compensation components?
The TPS543820RPYR-ET uses an internally compensated Advanced Current Mode (ACM) control architecture that generates an accurate emulated current ramp. This eliminates the need for external Type-II or Type-III compensation networks while maintaining stability with low-ESR ceramic capacitors. The device's three selectable ramp amplitudes - configured via a single MODE pin resistor - allow fine-tuning of loop bandwidth and phase margin for specific LC filter selections.
Can the TPS543820RPYR-ET safely start up into a pre-biased output voltage?
Yes, the TPS543820RPYR-ET supports monotonic start-up into pre-biased outputs. Its control logic prevents reverse current flow by holding the high-side MOSFET off until the internal reference ramps above the existing output voltage. This behavior is confirmed across all soft-start times (0.5 ms to 4 ms) and is independent of input voltage or load conditions - making it suitable for hot-swap and redundant power systems.
What are the exact resistor values needed to configure 1-MHz switching frequency and 2-ms soft-start on the TPS543820RPYR-ET?
To set 1-MHz switching frequency, connect a 11.8-kΩ ±1% resistor between SYNC/FSEL (Pin 1) and AGND. For 2-ms soft-start, connect a 2.74-kΩ ±1% resistor between MODE (Pin 2) and AGND. These values are specified in Table 7-1 and Table 7-4 of the datasheet and are validated across temperature and process corners - no trimming or calibration required.
Is the TPS543820RPYR-ET pin-compatible with other devices in the SWIFT™ 14-pin VQFN-HR family?
Yes, the TPS543820RPYR-ET is pin-to-pin compatible with TPS543620RPYR and TPS543320RPYR. All three share identical 14-pin VQFN-HR (RPY) packaging, pin functions, and control interface - enabling drop-in substitution based on current requirement (6-A, 8-A, or 12-A) without PCB redesign. Functional differences are limited to current rating, MOSFET RDS(on), and thermal pad layout recommendations.
TPS543820RPYR-ET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 14-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 8A
- Frequency - Switching:
- 400kHz ~ 2.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-VQFN-HR (2.5x3)
TPS543820RPYR-ET FAQ
1.How can I place an order for TPS543820RPYR-ET through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS543820RPYR-ET 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 TPS543820RPYR-ET reliable?
The price and inventory of TPS543820RPYR-ET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS543820RPYR-ET is usually 5 days.
3.What payment methods are accepted for TPS543820RPYR-ET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS543820RPYR-ET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS543820RPYR-ET?
TPS543820RPYR-ET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS543820RPYR-ET 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 TPS543820RPYR-ET?
For technical support, including TPS543820RPYR-ET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS543820RPYR-ET requirements.
6.How does Aetrix verify that TPS543820RPYR-ET is sourced from the original manufacturer or authorized distributors?
All TPS543820RPYR-ET 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 TPS543820RPYR-ET meets industry standards.
7.What is the process for return or replacement of TPS543820RPYR-ET?
All TPS543820RPYR-ET units undergo pre-shipment inspection (PSI). If there is an issue with TPS543820RPYR-ET, 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 TPS543820RPYR-ET part is unused and in its original packaging.
Return procedure for TPS543820RPYR-ET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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