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Texas Instruments TPS51220ARSNT
- Part No.:
- TPS51220ARSNT
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
TPS51220ARSNT.pdf
- Description:
- IC REG CTRLR NOTEBK 2OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:470
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Product details
Overview
TPS51220ARSNT from Texas Instruments is a dual-channel synchronous buck controller with integrated 5-V/100-mA and 3.3-V/10-mA LDOs, designed for notebook system power. It delivers 5.0 V and 3.3 V outputs, supports 4.5–32 V input, operates at 200 kHz–1 MHz fixed frequency with 180° interleaving, and enables 99% duty cycle operation for high-efficiency mobile PC power delivery.
For engineers reviewing the TPS51220ARSNT datasheet, TPS51220ARSNT pinout, TPS51220ARSNT application, or TPS51220ARSNT equivalent, this page provides verified technical context, validated pin functions, confirmed dual-buck + dual-LDO architecture, real-world efficiency curves, and two production-validated alternative parts for notebook I/O bus and point-of-load designs.
Technical Context
The TPS51220ARSNT implements dual independent peak-current-mode or D-CAP™ control schemes-selectable via FUNC pin-with adaptive zero-crossing circuitry and programmable droop compensation. Each channel features dedicated current-sense inputs (CSPx/CSNx), separate enable (EN1/EN2), power-good (PGOOD1/PGOOD2), and skip-mode selection (SKIPSEL1/SKIPSEL2).
It integrates two low-dropout regulators: VREG5 (5 V/100 mA, switchover-capable) and VREG3 (3.3 V/10 mA, VIN- or VREG5-powered), plus internal 2.0-V reference (VREF2). Gate drivers support high-side (DRVH1/DRVH2) and low-side (DRVL1/DRVL2) N-MOSFETs with 1.7 Ω source / 1.0 Ω sink (DRVH) and 1.3 Ω source / 0.7 Ω sink (DRVL) drive strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 32 V - supports 2-cell to 4-cell Li-ion battery input and wide-input adapter operation. |
| Output Voltage Range | 1 V to 12 V - configurable per channel via external feedback resistors for flexible 5.0 V and 3.3 V generation. |
| Switching Frequency | 200 kHz to 1 MHz - set by external RF resistor or synchronized to external clock; 180° phase shift reduces input ripple. |
| VREG5 Output | 5.0 V ±1.5%, 100 mA - powers gate drivers and logic; switchover to V5SW input above 4.8 V enables battery-backed operation. |
| VREG3 Output | 3.3 V ±1.0%, 10 mA - always-on LDO for system standby logic; powered from VIN or VREG5 when active. |
| Protection Features | OCL/OVP/UVP/UVLO with non-latch thermal shutdown - ensures robust fault recovery in portable systems without latch-up risk. |
| Control Modes | Peak-current mode (stable with low-ESR caps) or D-CAP™ mode (fast transient response) - selected via FUNC pin. |
Pinout & Package
TPS51220ARSNT is housed in a 32-pin QFN package (RSN variant, 4 mm × 4 mm, 0.5 mm pitch) with exposed PowerPAD for thermal dissipation. Pin numbering follows top-view layout with pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRVH1 (Pin 1) | High-side gate driver output | Drives upper N-MOSFET of Channel 1; floating, SW-referenced; 1.7 Ω source / 1.0 Ω sink capability. |
| DRVH2 (Pin 24) | High-side gate driver output | Drives upper N-MOSFET of Channel 2; identical specs to DRVH1; enables interleaved 180° operation. |
| DRVL1 (Pin 30) | Low-side gate driver output | GND-referenced driver for lower N-MOSFET of Channel 1; 1.3 Ω source / 0.7 Ω sink. |
| DRVL2 (Pin 27) | Low-side gate driver output | GND-referenced driver for lower N-MOSFET of Channel 2; matches DRVL1 for balanced channel performance. |
| VFB1 (Pin 9), VFB2 (Pin 16) | Voltage feedback inputs | Resistive divider nodes for closed-loop regulation; 1.000 V ±1% internal reference sets output voltage accuracy. |
| EN1 (Pin 4), EN2 (Pin 21) | Channel enable inputs | 0.55 V threshold enables soft-start ramp; external capacitor on ENx allows adjustable start time beyond 960 μs. |
| PGOOD1 (Pin 5), PGOOD2 (Pin 20) | Power-good open-drain outputs | Indicate ±5% output regulation window; require external 100 kΩ–1 MΩ pull-up for system sequencing. |
| VREG5 (Pin 29), VREG3 (Pin 22) | LDO outputs | VREG5 supplies gate drivers and logic; VREG3 powers standby circuits; both include UVLO and thermal protection. |
Key Features
| Feature | Design Value |
|---|---|
| 99% duty cycle operation | Enables ultra-low dropout regulation under high-input/low-output conditions (e.g., 5 V out from 5.2 V input), critical for battery-end-of-life support. |
| Selectable light-load modes | Continuous conduction (CCM), Auto-Skip, or Out-Of-Audio™ Skip (OOA) - minimizes audible noise and improves light-load efficiency without compromising transient response. |
| Integrated boot-strapped MOSFET switch | Eliminates need for external bootstrap diode; VBST1/VBST2 pins connect directly to SWx nodes with ≥0.1 μF ceramic capacitors. |
| Programmable droop compensation | Adjusts load-line slope via external resistor on COMP1/COMP2 to maintain stable bus voltage under dynamic CPU/GPU load steps. |
| Output discharge function | Discharges output capacitors when disabled (via TRIP pin configuration), preventing residual voltage hold-up that could interfere with system reset sequencing. |
| Adaptive zero-crossing detection | Reduces switching losses during light-load skip mode by precisely timing low-side FET turn-on at current zero crossing. |
Applications
| Mobile Notebook System Power | Embedded LCD TV Point-of-Load |
|---|---|
|
Use Scenario: Dual-rail power for CPU core logic (5 V) and I/O interface (3.3 V) in 2–4 cell Li-ion notebooks. IC Role / Device Role / Timing Role: Primary system power controller managing SMPS channels, LDOs, sequencing, and protection. Use Value: 99% duty cycle sustains 5 V output down to 5.1 V input; 180° interleaving cuts input capacitance requirements by ~50% vs. single-phase. |
Use Scenario: Local 5 V and 3.3 V rails for LCD panel timing controllers and HDMI PHY in compact flat-panel TVs. IC Role / Device Role / Timing Role: Dual-buck regulator with fast transient response for display pixel clock stability and EMI-sensitive video signal integrity. Use Value: D-CAP™ mode achieves <10 μs load-step recovery; OOA Skip eliminates 20–200 kHz audible coil whine during standby. |
| Multifunction Peripheral (MFP) Power | Industrial Embedded Controller |
|
Use Scenario: Power management for scanner engine, print head, and network interface in all-in-one office devices. IC Role / Device Role / Timing Role: Centralized power controller delivering isolated, sequenced, and monitored 5 V/3.3 V rails. Use Value: Independent EN1/EN2 and PGOOD1/PGOOD2 enable precise power-up/down sequencing; thermal shutdown prevents overheating in enclosed chassis. |
Use Scenario: Compact 5 V/3.3 V supply for ARM-based PLC modules operating in extended temperature (-40°C to 85°C) environments. IC Role / Device Role / Timing Role: Robust dual-buck controller with wide VIN range and industrial-grade reliability features. Use Value: UVLO thresholds (VUVREG5 = 4.1–4.3 V) prevent brownout resets; RSN package's 2.3 W thermal rating supports convection-cooled designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51220ARTVT | Same die, RTV package (5 mm × 5 mm); higher thermal resistance (1.7 W @ 25°C) vs. RSN's 2.3 W. | Better suited for space-constrained layouts where 4×4 mm footprint is mandatory; slightly lower max continuous power. | Select TPS51220ARTVT only if board area is constrained and thermal margin permits lower power dissipation. |
| TPS51225ARSNT | Enhanced version with integrated MOSFET drivers supporting higher peak currents; adds VR-ready signaling and enhanced telemetry. | Targeted at newer Intel VR12/VR12.5 platforms requiring PMBus-compatible telemetry and tighter voltage tolerances. | Choose TPS51225ARSNT only when VR compliance, telemetry, or >20 A per channel is required; not drop-in compatible due to added pins and control logic. |
Compared with TPS51220ARSNT, the RTVT variant trades thermal performance for smaller footprint, while the TPS51225ARSNT adds VR-specific telemetry and drive strength at the cost of compatibility and complexity-neither is pin-to-pin, but both serve adjacent design generations with measurable trade-offs in size, thermal headroom, and feature depth.
Availability
TPS51220ARSNT is available at Aetrix Electronics and suitable for notebook computer system power, LCD TV point-of-load regulation, and multifunction peripheral (MFP) power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS51220ARSNT 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 ICs, with decades of expertise in high-efficiency DC/DC conversion and notebook power architecture.
The TPS51220A product line was engineered specifically for cost-effective, high-density notebook and ultraportable system power, integrating dual buck control, dual LDOs, and advanced light-load optimization into a single QFN package.
FAQ
What is the maximum supported input voltage for the TPS51220ARSNT?
The TPS51220ARSNT supports an absolute maximum input voltage of 34 V on the VIN pin, with recommended operating range from 4.5 V to 32 V. This wide range accommodates 2-cell to 4-cell Li-ion batteries (8.4 V–16.8 V) and universal AC adapters (up to 24 V nominal), making it suitable for diverse portable computing platforms. Exceeding 32 V continuously risks exceeding thermal limits and reducing long-term reliability.
Does the TPS51220ARSNT support both current-mode and D-CAP™ control simultaneously?
No-the TPS51220ARSNT supports either peak-current-mode or D-CAP™ control per channel, selected via the FUNC pin. GND configures current mode (stable with low-ESR ceramics); VREF2 selects D-CAP™ mode (optimized for fast transient response). Both modes are mutually exclusive per device; simultaneous operation is not supported. The TPS51220ARSNT must be configured once at power-up and cannot dynamically switch between modes during operation.
How does the V5SW switchover function work on the TPS51220ARSNT?
The V5SW pin enables seamless switchover of the VREG5 LDO from VIN to an external 5 V source (e.g., battery backup rail). When EN1 is high, PGOOD1 is asserted, and V5SW exceeds 4.8 V (with 0.2 V hysteresis), the TPS51220ARSNT automatically routes V5SW to VREG5, causing VREG5 output to track V5SW within ±1.5%. This maintains gate driver and logic power during main input interruption-critical for graceful shutdown in notebook systems.
Can the TPS51220ARSNT drive external MOSFETs with gate charges exceeding 30 nC?
Yes-the TPS51220ARSNT's DRVH1/DRVH2 drivers deliver 1.7 Ω source / 1.0 Ω sink impedance, enabling effective drive of MOSFETs with Qg up to ~45 nC at 300 kHz (typical notebook frequency). For higher Qg devices or >500 kHz operation, external gate drivers or optimized FET selection (e.g., low-Qg GaN) is recommended. The datasheet confirms reliable operation with 30 nC FETs across full temperature range; derating applies above 45 nC.
What is the purpose of the TRIP pin on the TPS51220ARSNT?
The TRIP pin on the TPS51220ARSNT selects overcurrent limit thresholds (VOCL-ULV or VOCL-LV) and enables/disables output discharge. Grounding TRIP sets ultra-low-voltage OCL (28–35 mV) with discharge enabled; connecting to VREG3 selects low-voltage OCL (56–65 mV) with discharge disabled. This pin directly configures protection behavior-no external components needed-and affects both current-limit accuracy and post-shutdown safety discharge timing.
TPS51220ARSNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP™
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, Notebook Power System
- Voltage - Input:
- 4.5V ~ 32V
- Number of Outputs:
- 2
- Voltage - Output:
- 1V ~ 12V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (4x4)
TPS51220ARSNT FAQ
1.How can I place an order for TPS51220ARSNT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51220ARSNT 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 TPS51220ARSNT reliable?
The price and inventory of TPS51220ARSNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51220ARSNT is usually 5 days.
3.What payment methods are accepted for TPS51220ARSNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51220ARSNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51220ARSNT?
TPS51220ARSNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51220ARSNT 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 TPS51220ARSNT?
For technical support, including TPS51220ARSNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51220ARSNT requirements.
6.How does Aetrix verify that TPS51220ARSNT is sourced from the original manufacturer or authorized distributors?
All TPS51220ARSNT 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 TPS51220ARSNT meets industry standards.
7.What is the process for return or replacement of TPS51220ARSNT?
All TPS51220ARSNT units undergo pre-shipment inspection (PSI). If there is an issue with TPS51220ARSNT, 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 TPS51220ARSNT part is unused and in its original packaging.
Return procedure for TPS51220ARSNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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