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Texas Instruments TPS65400RGZT
- Part No.:
- TPS65400RGZT
- Manufacturer:
- Texas Instruments
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
TPS65400RGZT.pdf
- Description:
- IC REG BCK ADJ 4A/2A QUAD 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:624
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Product details
Overview
TPS65400RGZT from Texas Instruments is a 4-channel, PMBus/I²C-programmable power management unit (PMU) integrating four synchronous buck regulators with integrated FETs. It delivers up to 4 A per channel on SW1/SW2 and 2 A per channel on SW3/SW4, operates from 4.5–18 V input, supports adjustable output voltages down to 0.6 V, and enables precise sequencing for FPGA, DSP, and automotive infotainment systems.
For engineers reviewing the TPS65400RGZT datasheet, TPS65400RGZT pinout, TPS65400RGZT application, or TPS65400RGZT equivalent, this page provides verified specifications including independent PWM frequency tuning (275 kHz–2.2 MHz), current limit programmability per regulator, prebias start-up, thermal/overvoltage/overcurrent protection, and EEPROM-stored sequencing configuration - all critical for high-density, high-temperature industrial and communications power designs.
Technical Context
The TPS65400RGZT implements four independent buck controllers with internal high-side and low-side MOSFETs, each featuring dedicated feedback (VFB), compensation (COMP), soft-start/PGOOD multiplexed pins (SSx/PGx), and enable inputs (ENSWx). Its digital control layer uses a PMBus-compatible I²C interface with on-chip EEPROM to store voltage setpoints, sequencing delays, phase alignment, and current limits - enabling runtime reconfiguration without external microcontroller intervention.
Thermal management is supported by integrated overtemperature protection (160°C shutdown, 20°C hysteresis), while analog subsystems include three internal regulators (VDDA, VDDD, VDDG) and precision error amplifiers (95–165 µS transconductance, ±1% VFB accuracy). The device supports clock synchronization via RCLOCK_SYNC and CLK_OUT, and allows interleaving of SW1/SW2 and SW3/SW4 to reduce input/output ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports direct connection to 5-V or 12-V intermediate distribution buses without pre-regulation. |
| Output Current Capability | SW1/SW2: 4 A max; SW3/SW4: 2 A max - enables powering high-current digital loads like FPGAs and multicore MCUs from a single IC. |
| Switching Frequency Range | 275 kHz to 2.2 MHz (resistor- or I²C-configurable) - allows optimization of inductor size, efficiency, and EMI performance per rail. |
| VREF Programmability | 0.6 V to 1.87 V in 10-mV steps - sets output voltage accuracy and enables dynamic voltage scaling for processors. |
| Protection Features | UVLO (4.25–4.48 V rising), OCP (±25% current limit accuracy), OVP/UVP (±9% of VREF), OTP (160°C shutdown) - ensures robust operation under fault conditions. |
| Package Thermal Resistance | RθJA = 29.8°C/W (VQFN-48, 7 mm × 7 mm) - supports operation up to 125°C junction temperature with standard PCB copper area. |
| I²C Interface | PMBus v1.2 compatible with EEPROM storage - enables nonvolatile configuration of sequencing, voltage, frequency, and fault responses. |
Pinout & Package
TPS65400RGZT is housed in a thermally enhanced 7-mm × 7-mm, 48-pin VQFN package (RGZ) with exposed thermal pad soldered to PGND for optimal heat dissipation. Pin pitch is 0.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENSW1/ENSEQ (Pin 48) | Enable input / Sequencing master control | Active-high enable for SW1; also serves as primary sequencing trigger when configured via EEPROM. |
| SS1/PG1 (Pin 45) | Soft-start timing / PGOOD1 output | Capacitor-adjustable startup ramp; reconfigurable via I²C to report SW1 power-good status. |
| VFB1 (Pin 47) | Feedback input for SW1 | Connects to resistor divider to set output voltage; referenced to internal 0.6–1.87 V programmable VREF. |
| COMP1 (Pin 46) | Compensation network node | External RC network stabilizes SW1 control loop; pulling COMP2 high configures SW1 to drive both SW1 and SW2. |
| CB1 (Pin 1) | Bootstrap capacitor connection | Provides gate-drive voltage for SW1 high-side MOSFET; requires 0.1-µF ceramic capacitor to SW1 pin. |
| SCL / SDA (Pins 43 / 42) | I²C bus interface | Supports PMBus commands for real-time voltage adjustment, fault logging, and sequencing control. |
| RCLOCK_SYNC (Pin 40) | Frequency setting / sync input | Resistor sets base switching frequency; accepts external clock for synchronization across multiple TPS65400RGZT devices. |
| PGOOD (Pin 17) | Aggregate power-good output | Open-drain signal indicating all enabled rails are within regulation; configurable per-rail via PIN_CONFIG_00 register. |
Key Features
| Feature | Design Value |
|---|---|
| Independent current limit programming per regulator | Enables inductor size and cost reduction by matching current rating to actual load requirements (SW1/SW2: 2–6 A; SW3/SW4: 0.5–3 A). |
| EEPROM-stored power sequencing | Eliminates external sequencer ICs; supports time-based or PGOOD-dependent startup/shutdown order for up to four rails. |
| Phase-aligned PWM outputs | Reduces input capacitance requirements and output ripple by interleaving SW1/SW2 and SW3/SW4 with ≤5° phase error at 1.1 MHz. |
| Prebias start-up algorithm | Prevents output voltage dip during startup into precharged loads - critical for hot-swap and multi-rail system reliability. |
| Thermally optimized VQFN-48 package | 0.8°C/W bottom-side thermal resistance (RθJC(bot)) enables >3 W continuous power dissipation with minimal PCB copper. |
Applications
| Small Cellular Base Stations | Automotive Infotainment Systems |
|---|---|
Use Scenario: Powering RF front-end, baseband processor, and memory in picocell/microcell BTS equipment with strict size and thermal constraints. IC Role / Device Role / Timing Role: Primary PMU delivering four regulated rails (e.g., 1.2 V core, 1.8 V I/O, 3.3 V interface, 5 V analog) with synchronized startup and fault reporting. Use Value: Single-chip solution replaces discrete DC/DC + sequencing logic, reducing board area by >40% and enabling fanless operation at 85°C ambient. |
Use Scenario: Supplying ADAS camera modules, head-unit SoCs, and display drivers in AEC-Q100 Grade 1 qualified vehicle platforms. IC Role / Device Role / Timing Role: High-reliability power controller managing cold-cranking tolerance, load-dump immunity, and ASIL-B compliant sequencing. Use Value: Integrated UVLO (4.25 V rising), OTP, and EEPROM-configured fail-safe sequencing meet automotive functional safety requirements without external supervision. |
| Industrial PoE-Powered Equipment | DSP/MCU Power Subsystems |
Use Scenario: Converting 57 V PoE-derived 12 V intermediate bus to multiple low-voltage rails for switches, routers, and wireless access points. IC Role / Device Role / Timing Role: Efficient intermediate bus converter with dynamic voltage positioning and I²C telemetry for remote power health monitoring. Use Value: 95% peak efficiency and programmable current limits allow inductor downsizing while maintaining IEEE 802.3bt compliance under varying load profiles. |
Use Scenario: Providing tightly regulated, sequenced power to high-performance DSPs (e.g., C66x) and multicore MCUs requiring rapid voltage scaling during mode transitions. IC Role / Device Role / Timing Role: Digital power manager supporting dynamic VREF adjustment, soft-start delay control, and real-time current readback via PMBus. Use Value: 10-mV VREF steps and <30 µs transient response enable sub-100 mV output deviation during 2-A load steps - preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65400RGZR | Same die, tape-and-reel packaging (2,500 pcs/reel vs. 250 pcs for RGZT); identical electrical specs and pinout. | No functional difference; selected for high-volume automated assembly where reel format improves placement efficiency. | Choose RGZR for production runs ≥5,000 units; RGZT remains optimal for prototyping and low-volume qualification. |
| TPS65917BZWSR | Higher integration (includes LDOs, battery charger, GPIOs); 3.3-V fixed VDDIO; lower max input (5.5 V); no SW3/SW4 current sharing. | Targeted at mobile/tablet SoC power (e.g., AM57x), not industrial/high-input applications; lacks 18-V capability and dual 4-A channels. | Select only if system requires integrated battery charging or always operates below 5.5 V input; not drop-in for TPS65400RGZT's 4.5–18 V range. |
Compared with TPS65400RGZT, the RGZR offers identical functionality in volume-optimized packaging, while the TPS65917BZWSR trades input voltage range and dual 4-A capability for broader system integration - making TPS65400RGZT uniquely suited for high-input, high-current, thermally constrained infrastructure applications.
Availability
TPS65400RGZT is available at Aetrix Electronics and suitable for small cellular base stations, automotive infotainment systems, and industrial PoE-powered equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100 Grade 1 qualification.
Supply support for TPS65400RGZT 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 TPS65400RGZT belongs to TI's high-density PMU product line, designed specifically for space-constrained, high-ambient-temperature applications such as communications infrastructure and automotive electronics where efficiency, programmability, and thermal resilience are critical.
FAQ
What is the maximum input voltage rating for the TPS65400RGZT?
The TPS65400RGZT has an absolute maximum input voltage rating of 20 V across PVIN1–PVIN4 and VIN pins. However, its recommended operating input range is 4.5 V to 18 V. Operation above 18 V is not advised for sustained use, as it exceeds the specified safe operating area and may impact long-term reliability or trigger overvoltage protection.
Does the TPS65400RGZT support prebias start-up, and how does it work?
Yes, the TPS65400RGZT implements a prebias start-up algorithm that prevents output voltage dip when powering into precharged loads. During startup, the controller monitors the VFB pin and gradually ramps the duty cycle only after confirming the output is already near regulation - ensuring seamless transition without undershoot, which is essential for hot-swap and multi-rail systems using TPS65400RGZT.
Can the TPS65400RGZT be used in AEC-Q100 Grade 1 automotive applications?
Yes, the TPS65400RGZT is offered in an AEC-Q100 Grade 1 qualified variant (TPS65400RGZTQ1), rated for –40°C to +125°C junction temperature and validated for automotive reliability standards. Standard TPS65400RGZT is not qualified; only the Q1 suffix version meets AEC-Q100 requirements for infotainment and telematics systems.
How is power sequencing configured on the TPS65400RGZT?
Power sequencing on the TPS65400RGZT can be implemented either through hardware enable pins (ENSW1–ENSW4) with external RC timing networks or via PMBus/I²C commands that write sequence parameters (delays, dependencies, voltage targets) into on-chip EEPROM. Once stored, the sequence executes autonomously at power-on without host intervention - a key feature distinguishing TPS65400RGZT from basic multi-rail controllers.
What thermal performance can be expected from the TPS65400RGZT in a standard 4-layer PCB layout?
In a typical 4-layer PCB with 2 oz copper, 1-in² thermal pad area, and 2×2 thermal vias under the exposed pad, the TPS65400RGZT achieves RθJA ≈ 30°C/W. At full 4-A load on SW1/SW2 and 2-A on SW3/SW4 with 12-V input, junction temperature rise stays below 75°C - well within the 125°C maximum, enabling reliable operation without forced air cooling.
TPS65400RGZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 16.2V
- Current - Output:
- 4A, 2A
- Frequency - Switching:
- 275kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-VQFN (7x7)
TPS65400RGZT FAQ
1.How can I place an order for TPS65400RGZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65400RGZT 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 TPS65400RGZT reliable?
The price and inventory of TPS65400RGZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65400RGZT is usually 5 days.
3.What payment methods are accepted for TPS65400RGZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65400RGZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65400RGZT?
TPS65400RGZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65400RGZT 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 TPS65400RGZT?
For technical support, including TPS65400RGZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65400RGZT requirements.
6.How does Aetrix verify that TPS65400RGZT is sourced from the original manufacturer or authorized distributors?
All TPS65400RGZT 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 TPS65400RGZT meets industry standards.
7.What is the process for return or replacement of TPS65400RGZT?
All TPS65400RGZT units undergo pre-shipment inspection (PSI). If there is an issue with TPS65400RGZT, 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 TPS65400RGZT part is unused and in its original packaging.
Return procedure for TPS65400RGZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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