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Texas Instruments TPS51221RTVR
- Part No.:
- TPS51221RTVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
TPS51221RTVR.pdf
- Description:
- IC REG TRPL BUCK/LNR SYNC 32WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,492
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Product details
Overview
TPS51221RTVR from Texas Instruments is a dual synchronous buck regulator controller with integrated 5-V/100-mA and 3.3-V/10-mA LDOs, designed for notebook system power management. It delivers two independent regulated outputs (5.0 V and 3.3 V), supports 4.5–28 V input, operates at 200 kHz–1 MHz fixed frequency with 180° phase shift, and features current-mode control, programmable droop compensation, and dual power-good outputs.
For engineers reviewing the TPS51221RTVR datasheet, TPS51221RTVR pinout, TPS51221RTVR application, or TPS51221RTVR equivalent, key selection considerations include its dual-channel interleaved buck architecture, resistor-programmable switching frequency, integrated bootstrap MOSFET switch, light-load operation modes (CCM/Auto-Skip/Out-of-Audio™ Skip), and thermal shutdown with non-latch behavior.
Technical Context
The TPS51221RTVR implements peak current-mode control with independent error amplifiers (COMP1/COMP2) and transconductance gain of 500 µS per channel, enabling stable regulation with low-ESR output capacitors. Its dual-channel design uses 180° phase interleaving to reduce input ripple and improve transient response.
It integrates two LDOs-VREG5 (5 V/100 mA) and VREG3 (3.3 V/10 mA)-with switchover capability (V5SW), plus a 2.0-V reference (VREF2) for feedback accuracy. Protection includes OVP/UVP/OCL on both channels, thermal shutdown at 150°C, and output discharge control via TRIP pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 28 V - supports wide-input battery-powered systems including 2–4 cell Li-ion notebooks. |
| Output Voltages | Configurable 1 V to 12 V per channel - factory-set to 5.0 V and 3.3 V for core I/O rail generation. |
| Switching Frequency | 200 kHz to 1 MHz - adjustable via RF pin resistor; enables optimization of size vs. efficiency vs. EMI. |
| Duty Cycle Max | 99% - allows high-step-down ratio operation and extends battery runtime in low-VIN conditions. |
| Current Sensing | Resistor or DCR-based - supports accurate current monitoring and overcurrent protection with selectable thresholds (ULV/LV). |
| Thermal Shutdown | 150°C threshold with 10°C hysteresis - protects against sustained overload without latch-up, enabling automatic recovery. |
| Package | 32-pin QFN (5 mm × 5 mm, RTV) - thermally enhanced PowerPAD for high-power density and efficient heat dissipation. |
Pinout & Package
TPS51221RTVR is housed in a 32-pin QFN package (5 mm × 5 mm, RTV) with exposed thermal pad (PowerPAD) for enhanced thermal performance. Pin numbering follows top-view layout with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRVH1 / DRVH2 | High-side gate drivers | Floating drivers (1.7 Ω source / 1.0 Ω sink) referenced to SWx; enable N-channel MOSFET control with bootstrapped VBSTx supply. |
| DRVL1 / DRVL2 | Low-side gate drivers | GND-referenced drivers (1.3 Ω source / 0.7 Ω sink); drive synchronous rectifier FETs for high-efficiency operation. |
| VFB1 / VFB2 | Feedback inputs | High-impedance (±50 nA) inputs for resistor-divider feedback; regulate VO1/VO2 to 1.000 V ±1% reference. |
| CSP1/CSN1 / CSP2/CSN2 | Current sense inputs | Differential inputs for DCR/resistor sensing; support ultra-low-voltage (ULV) or low-voltage (LV) current limit thresholds (27–64 mV). |
| PGOOD1 / PGOOD2 | Power-good outputs | Open-drain outputs with 92.5–107.5% window detection; require external pull-up for system sequencing and fault signaling. |
| EN1 / EN2 | Channel enable inputs | Logic-level enables (0.55 V threshold) with adjustable soft-start via external capacitor; support independent channel sequencing. |
| VREG5 / VREG3 | LDO outputs | VREG5: 5 V/100 mA with switchover to V5SW; VREG3: 3.3 V/10 mA powered from VIN or VREG5 - supplies bias for internal circuitry and external logic. |
| TRIP / SKIPSEL1 / SKIPSEL2 | Configuration inputs | TRIP selects OCL threshold/discharge mode; SKIPSELx configures CCM/Auto-Skip/Out-of-Audio™ Skip per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Interleaved dual buck topology | 180° phase shift reduces input RMS current by ~30%, lowering input capacitor stress and EMI filtering requirements. |
| Programmable light-load operation | Three modes (CCM, Auto-Skip, Out-of-Audio™ Skip) allow trade-off between efficiency, output ripple, and audible noise in portable systems. |
| Integrated boot strap switch | On-chip MOSFET eliminates need for external diode in high-side driver bootstrap path, simplifying layout and improving reliability. |
| Dual independent power-good signals | PGOOD1/PGOOD2 provide per-channel voltage monitoring with 5% hysteresis and 0.8–1.2 ms delay - essential for safe power sequencing in multi-rail systems. |
| Current monitor output (IMON1) | Analog current monitor for CH1 with gain of 100× (ULV) or 50× (LV); enables real-time load monitoring and system-level power management. |
Applications
| Notebook System Power | LCD TV Point-of-Load |
|---|---|
Use Scenario: Powering CPU core logic, chipset, and peripheral I/O rails in 2–4 cell Li-ion notebook platforms. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller generating tightly regulated 5.0 V and 3.3 V system rails with fast transient response and sequencing control. Use Value: Enables compact, high-efficiency power delivery with <1% output voltage tolerance, 99% duty cycle for extended battery life, and integrated LDOs reducing BOM count. | Use Scenario: Supplying main logic board and display interface circuits in LCD TVs and multifunction printers (MFPs). IC Role / Device Role / Timing Role: Primary DC-DC controller delivering stable 5 V and 3.3 V rails from wide-input unregulated bus (e.g., 12 V or 19 V adapter). Use Value: Supports high input voltage range (4.5–28 V), offers selectable skip modes to minimize no-load power, and provides robust OVP/UVP/OCL protection for long-term reliability. |
| Mobile PC System Controller | Industrial Embedded Control |
Use Scenario: Managing power for embedded controllers, USB hubs, and audio codecs in fanless mobile PCs and ultrabooks. IC Role / Device Role / Timing Role: Dual-output power controller with independent enable/soft-start and power-good signaling for flexible rail sequencing and fault isolation. Use Value: Delivers fast load transient response (<100 µs recovery), thermal shutdown with auto-recovery, and low quiescent current (7 µA shutdown, 80 µA standby) for always-on subsystems. | Use Scenario: Providing regulated auxiliary rails in industrial HMIs, programmable logic controllers (PLCs), and network edge devices operating across wide temperature ranges. IC Role / Device Role / Timing Role: Robust dual-buck controller rated for –40°C to 85°C ambient, featuring 150°C thermal shutdown and UVLO thresholds tailored for unstable input sources. Use Value: Ensures reliable operation under harsh conditions with integrated protections (OVP/UVP/OCL), high-accuracy feedback (±1%), and stable current-mode control across input/output variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51220RTVR | Single-channel version without VREG3 LDO; lacks second buck channel and 3.3-V regulator. | Suitable only for single-rail systems requiring 5-V output; cannot replace dual-rail functionality of TPS51221RTVR. | Select when only one regulated output is needed and space/budget constraints preclude dual-channel solution. |
| ISL95831IRZ | Supports higher max input (30 V), includes SMBus interface, but lacks integrated VREG3 and has different pinout. | Better suited for server/client platforms requiring digital control and telemetry; not drop-in compatible due to different feature set and footprint. | Choose for designs needing PMBus communication, higher input voltage margin, or advanced telemetry - not for direct replacement. |
Compared with TPS51221RTVR, TPS51220RTVR omits the second buck channel and 3.3-V LDO, limiting system integration, while ISL95831IRZ adds digital control at the cost of analog simplicity and pin compatibility - making TPS51221RTVR optimal for cost-sensitive, analog-controlled dual-rail notebook and embedded applications.
Availability
TPS51221RTVR is available at Aetrix Electronics and suitable for notebook computer system power, LCD TV point-of-load regulation, and industrial embedded control applications requiring stable component supply, long lifecycle support, and RoHS-compliant packaging.
Supply support for TPS51221RTVR 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 and embedded processing technologies, with decades of expertise in power management ICs for computing and portable electronics.
The TPS51221RTVR belongs to TI's notebook system power controller product line, engineered specifically to consolidate multiple voltage rails into a single IC for space-constrained, high-efficiency mobile platforms.
FAQ
What is the maximum duty cycle supported by the TPS51221RTVR?
The TPS51221RTVR supports up to 99% duty cycle operation, enabling high step-down ratios and extended battery runtime in low-input-voltage conditions such as deep-discharge states of 2-cell Li-ion batteries. This capability is critical for maintaining regulation during brownout scenarios without dropping out of regulation.
Does the TPS51221RTVR include integrated LDOs, and what are their specifications?
Yes, the TPS51221RTVR integrates two LDOs: VREG5 delivers 5.0 V at up to 100 mA with switchover to V5SW input, and VREG3 provides 3.3 V at up to 10 mA. Both are internally powered from VIN or VREG5, and feature UVLO thresholds (4.1 V for VREG5, 3.0 V for VREG3) and tight output tolerances (±1% for VREG5, ±1.5% for VREG3).
How does the TPS51221RTVR handle light-load efficiency optimization?
The TPS51221RTVR offers three selectable light-load modes via SKIPSEL1/SKIPSEL2 pins: Continuous Conduction Mode (CCM), Auto-Skip, and Out-of-Audio™ Skip (OOA). OOA mode limits switching frequency to sub-audible ranges (e.g., ≤400 kHz) with configurable skip depth, eliminating audible noise while maintaining >85% efficiency at 10 mA load.
What protection features are built into the TPS51221RTVR?
The TPS51221RTVR includes overvoltage protection (OVP), undervoltage protection (UVP), overcurrent limiting (OCL) with ULV/LV thresholds, input undervoltage lockout (UVLO), thermal shutdown at 150°C with 10°C hysteresis, and non-latching fault recovery. Each channel has independent PGOOD monitoring and optional output discharge control via the TRIP pin.
Can the TPS51221RTVR synchronize to an external clock, and how is it configured?
Yes, the TPS51221RTVR can synchronize to an external clock signal applied to the RF pin. When an external clock is present, the internal oscillator is disabled and the device locks to the external frequency within the 200 kHz–1 MHz range. Synchronization enables deterministic EMI reduction and coordinated switching in multi-phase or multi-IC systems.
TPS51221RTVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (2)
- Number of Outputs:
- 3
- Frequency - Switching:
- 200kHz ~ 1MHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- 3.3V, 10mA
- Voltage/Current - Output 3:
- 5V, 100mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-WQFN (5x5)
TPS51221RTVR FAQ
1.How can I place an order for TPS51221RTVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51221RTVR 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 TPS51221RTVR reliable?
The price and inventory of TPS51221RTVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51221RTVR is usually 5 days.
3.What payment methods are accepted for TPS51221RTVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51221RTVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51221RTVR?
TPS51221RTVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51221RTVR 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 TPS51221RTVR?
For technical support, including TPS51221RTVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51221RTVR requirements.
6.How does Aetrix verify that TPS51221RTVR is sourced from the original manufacturer or authorized distributors?
All TPS51221RTVR 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 TPS51221RTVR meets industry standards.
7.What is the process for return or replacement of TPS51221RTVR?
All TPS51221RTVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS51221RTVR, 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 TPS51221RTVR part is unused and in its original packaging.
Return procedure for TPS51221RTVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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