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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Texas Instruments TPS51518RUKT

Name: TPS51518RUKT
Brand: Texas Instruments
SKU: TPS51518RUKT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS51518RUKT

Manufacturer:: Texas Instruments

Category:: Special Purpose Regulators

Package:: 20-WFQFN Exposed Pad

Datasheet:: TPS51518RUKT.pdf

Description:: IC REG CTRLR VID 1OUT 20WQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TPS51518RUKT from Texas Instruments is a single-phase synchronous buck controller implementing D-CAP™ and D-CAP2™ adaptive on-time modulation, supporting 2-bit VID voltage selection (0.5 V to 2.0 V), 350 kHz fixed-frequency operation, and R_DS(on) current sensing for notebook GFX and system agent power supplies. It delivers differential voltage feedback, programmable soft-start, and integrated high/low-side gate drivers in a 3 mm × 3 mm QFN package.

For engineers reviewing the TPS51518RUKT datasheet, TPS51518RUKT pinout, TPS51518RUKT application, or TPS51518RUKT equivalent, key selection criteria include VID-programmable output voltage range, D-CAP/D-CAP2 mode flexibility for ceramic vs. polymer capacitors, R_DS(on)-based current sensing with 4700 ppm/°C temperature compensation, and thermal shutdown at 140°C.

Technical Context

The TPS51518RUKT implements dual control architectures: D-CAP™ mode uses ESR-based ripple injection into an integrator (g_M = 60 µS) for fast transient response with organic/polymer capacitors, while D-CAP2™ mode employs internal RC compensation for stable operation with ultra-low-ESR MLCCs. Both operate at 350 kHz with adaptive on-time inversely proportional to input voltage and proportional to output voltage.

It supports differential remote sensing via VSNS/GSNS pins, 2-bit VID logic (VID0/VID1) compatible with 1-V/3.3-V levels, and dynamic VID transition with slew-rate control (10 µA soft-start / 50 µA VID-slew current). Protection includes cycle-by-cycle OCL (trip set by TRIP pin resistor), OVP (120% threshold), UVP (68% threshold), 5-V UVLO, and non-latched thermal shutdown.

Key Specifications

Parameter	Value and Actual Design Meaning
Control Architecture	D-CAP™ and D-CAP2™ adaptive on-time modulation, selectable via MODE pin
Switching Frequency	350 kHz fixed frequency, pseudo-constant under load and line variation
Output Voltage Range	0.5 V to 2.0 V, programmable via 2-bit VID (V0–V3) with external resistor dividers
Current Sensing	R_DS(on) sensing using GSNS/SW nodes; TRIP pin sources 10 µA (4700 ppm/°C tempco)
Soft-Start & Slew	10 µA internal current for soft-start timing; 50 µA for VID transition slew rate control
Protection Features	OVP (120% VOUT), UVP (68% VOUT), cycle-by-cycle OCL, 5-V UVLO, thermal shutdown at 140°C
Package	3 mm × 3 mm, 20-pin QFN (RUK) with exposed thermal pad

Pinout & Package

TPS51518RUKT is housed in a 3 mm × 3 mm, 0.4-mm pitch, 20-pin plastic QFN (RUK) package with an exposed thermal pad connected to GND. Pin numbering follows standard QFN convention (pin 1 at top-left corner, counterclockwise).

Pin/Terminal	Circuit Role	Design Meaning
1 GSNS	Current sense return	Positive R_DS(on) current sensing node; ties to GND or low-side MOSFET source
2 V3	VID reference input	Selects VID=11 output voltage level via external resistor divider from VREF
3 V2	VID reference input	Selects VID=10 output voltage level via external resistor divider from VREF
4 V1	VID reference input	Selects VID=01 output voltage level via external resistor divider from VREF
5 V0	VID reference input	Selects VID=00 output voltage level via external resistor divider from VREF
6 VREF	Voltage reference output	2.0 V ±1% reference with 300 µA sourcing capability for VID divider bias
7 PGOOD	Power-good indicator	Open-drain output asserting when VOUT is within ±8% of target; 1-ms delay on rise
8 VID0	VID select logic input	2-bit VID LSB; accepts 1-V or 3.3-V logic; hysteresis = 0.4 V
9 VID1	VID select logic input	2-bit VID MSB; accepts 1-V or 3.3-V logic; hysteresis = 0.4 V
10 EN	Enable input	Active-high enable with 0.5 V low-threshold and 1.5 V high-threshold; supports 3.3-V logic
11 BST	Bootstrap supply	Connects external bootstrap capacitor to SW; internally switches between V5IN and SW
12 SW	Switch node	High-side MOSFET drain connection; R_DS(on) current sensing negative input
13 DRVH	High-side gate driver	Drives high-side N-channel MOSFET gate; R_DH = 1.7 Ω (source), 0.8 Ω (sink)
14 DRVL	Low-side gate driver	Drives low-side N-channel MOSFET gate; R_DL = 1.1 Ω (source), 0.6 Ω (sink)
15 V5IN	5-V internal supply	Input for internal circuitry and gate drivers; UVLO thresholds: 4.4 V (wake-up), 4.0 V (shutdown)
16 MODE	Control mode select	GND = D-CAP™; 5-V = D-CAP2™; sampled at EN assertion
17 GND	Ground reference	Combined AGND/PGND; serves as current sense return and thermal pad connection point
18 TRIP	OCL setpoint input	Sources 10 µA (4700 ppm/°C); trip threshold = V_TRIP/8 across external R_TRIP
19 SLEW	Slew/soft-start control	Accepts external capacitor; 10 µA for soft-start, 50 µA during VID transitions
20 VSNS	Voltage sense input	Differential remote sense positive input; connects to load VOUT point

Key Features

Feature	Design Value
Dual-mode adaptive control	Selectable D-CAP™ (for polymer/organic caps) or D-CAP2™ (for MLCCs) via MODE pin
2-bit VID programmability	Four independent output voltages (0.5–2.0 V) set via external resistor dividers on V0–V3
R_DS(on) current sensing	Eliminates sense resistor; TRIP pin current tempco (4700 ppm/°C) compensates MOSFET R_DS(on) drift
Integrated gate drivers	DRVH/DRVL drive N-MOSFETs directly; R_DH/R_DL specified at 50 mA load
Programmable soft-start & VID slew	External capacitor on SLEW pin sets both startup ramp time and VID transition speed
Full protection suite	OVP/UVP/OCL/UVLO/thermal shutdown with defined thresholds and propagation delays

Applications

Notebook GFX Power Supply	Intel Chief River System Agent
Use Scenario: Powers discrete GPU core voltage (V_GPU) in thin-and-light notebooks requiring rapid VID transitions between performance and idle states. IC Role / Device Role / Timing Role: Single-phase synchronous buck controller managing up to 30-A load with D-CAP2™ mode for MLCC stability and 350-kHz switching. Use Value: Enables <100-µs VID transitions with built-in slew control and FCCM override, reducing voltage droop during GPU frequency scaling.	Use Scenario: Supplies Intel Chief River platform System Agent (SA) rail where tight regulation and multi-voltage sequencing are required. IC Role / Device Role / Timing Role: VID-programmable buck controller delivering 0.8 V (VID=10) or 0.9 V (VID=00) with differential remote sensing to compensate PCB IR drop. Use Value: Achieves ±0.5% DC load regulation via external integrator capacitor and differential VSNS/GSNS feedback, meeting SA voltage tolerance specs.
Mobile Workstation Core Rail	Gaming Laptop Multi-Rail Sequencing
Use Scenario: Generates CPU core voltage (V_CC) in mobile workstations where thermal headroom limits continuous conduction mode. IC Role / Device Role / Timing Role: Adaptive on-time controller operating in auto-skip mode below 1-A load to maintain >85% efficiency at light loads. Use Value: Reduces standby power loss by >40% versus forced CCM, extending battery life without sacrificing transient response.	Use Scenario: Coordinates multiple power rails (GFX, SA, memory) in high-performance gaming laptops using shared VID lines and synchronized soft-start. IC Role / Device Role / Timing Role: Controller with programmable soft-start current (10 µA) and PGOOD open-drain output enabling precise power-rail sequencing. Use Value: Ensures safe boot sequence via PGOOD assertion (±8% window, 1-ms delay) before enabling downstream logic, preventing latch-up.

Notebook GFX Power Supply

Intel Chief River System Agent

Use Scenario: Powers discrete GPU core voltage (V_GPU) in thin-and-light notebooks requiring rapid VID transitions between performance and idle states.

IC Role / Device Role / Timing Role: Single-phase synchronous buck controller managing up to 30-A load with D-CAP2™ mode for MLCC stability and 350-kHz switching.

Use Value: Enables <100-µs VID transitions with built-in slew control and FCCM override, reducing voltage droop during GPU frequency scaling.

Use Scenario: Supplies Intel Chief River platform System Agent (SA) rail where tight regulation and multi-voltage sequencing are required.

IC Role / Device Role / Timing Role: VID-programmable buck controller delivering 0.8 V (VID=10) or 0.9 V (VID=00) with differential remote sensing to compensate PCB IR drop.

Use Value: Achieves ±0.5% DC load regulation via external integrator capacitor and differential VSNS/GSNS feedback, meeting SA voltage tolerance specs.

Mobile Workstation Core Rail

Gaming Laptop Multi-Rail Sequencing

Use Scenario: Generates CPU core voltage (V_CC) in mobile workstations where thermal headroom limits continuous conduction mode.

IC Role / Device Role / Timing Role: Adaptive on-time controller operating in auto-skip mode below 1-A load to maintain >85% efficiency at light loads.

Use Value: Reduces standby power loss by >40% versus forced CCM, extending battery life without sacrificing transient response.

Use Scenario: Coordinates multiple power rails (GFX, SA, memory) in high-performance gaming laptops using shared VID lines and synchronized soft-start.

IC Role / Device Role / Timing Role: Controller with programmable soft-start current (10 µA) and PGOOD open-drain output enabling precise power-rail sequencing.

Use Value: Ensures safe boot sequence via PGOOD assertion (±8% window, 1-ms delay) before enabling downstream logic, preventing latch-up.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS51285RUKT	Single-phase controller with integrated FETs (30-V max VIN), no VID inputs, fixed 1.05-V output	Targeted at cost-sensitive embedded systems; lacks 2-bit VID flexibility and D-CAP2™ mode	Choose TPS51285RUKT only if fixed-output, integrated-FET simplicity outweighs need for programmable voltage and ceramic-cap compatibility
ISL95831IRZ	Single-phase controller with 3-bit VID (8 voltage levels), 500-kHz switching, and Intel VR12.5 compliance	Designed specifically for Intel mobile CPUs; supports PROCHOT#, VR_HOT, and phase shedding	Choose ISL95831IRZ when Intel VR12.5 protocol compliance and 3-bit VID granularity are mandatory for CPU core rail

Compared with TPS51285RUKT and ISL95831IRZ, the TPS51518RUKT uniquely balances VID-programmable flexibility (0.5–2.0 V), dual D-CAP modes for capacitor agnosticism, and compact 3-mm QFN packaging-making it optimal for space-constrained GFX and SA supplies where voltage agility and ceramic-cap support are critical.

Availability

TPS51518RUKT is available at Aetrix Electronics and suitable for notebook computer power delivery, graphics subsystems, and Intel Chief River platform designs requiring stable component supply, long-term lifecycle management, and traceable sourcing.

Supply support for TPS51518RUKT 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.

The TPS51518RUKT belongs to TI's D-CAP™ controller family, engineered specifically for high-transient-response, multi-voltage power delivery in mobile computing platforms including notebooks and ultrabooks.

FAQ

What is the recommended output capacitor type for TPS51518RUKT in D-CAP2™ mode?

The TPS51518RUKT is optimized for ultra-low-ESR multilayer ceramic capacitors (MLCCs) in D-CAP2™ mode. This mode uses an internal phase compensation network (RC1/RC2/CC1/CC2) to stabilize the loop without external components. Polymer or organic capacitors are not recommended in D-CAP2™ mode due to insufficient high-frequency ESR needed for proper ripple sensing-use D-CAP™ mode instead for those types. Always verify stability with Bode plot measurements per Figure 9 and Figure 10 in the SLUSAO8 datasheet for your specific layout and component selection.

How does the TPS51518RUKT implement temperature-compensated overcurrent protection?

The TPS51518RUKT implements temperature-compensated overcurrent protection via its TRIP pin, which sources a current (I_TRIP) with a 4700 ppm/°C temperature coefficient. This current flows through an external resistor (R_TRIP) tied to GND, setting the overcurrent threshold as V_TRIP/8. As temperature rises, I_TRIP increases proportionally, raising the trip voltage to match the positive temperature coefficient of MOSFET R_DS(on), ensuring consistent current-limit accuracy across –10°C to 105°C. The TPS51518RUKT does not use a fixed threshold or digital calibration-compensation is fully analog and continuous.

Can TPS51518RUKT operate with only one VID bit (VID0) active?

Yes, the TPS51518RUKT supports 1-bit VID operation using only VID0, with VID1 grounded. In this configuration, two output voltages are selectable: VID=0 (V0) and VID=1 (V1). Unused VID inputs (V2, V3) must be tied to GND-not left floating-to ensure correct logic decoding and avoid undefined behavior. The device retains full functionality including D-CAP™/D-CAP2™ mode selection, soft-start, and all protections. This mode simplifies designs requiring only dual-voltage operation, such as performance/idle states in mobile SoCs.

What is the minimum external capacitor value required on the SLEW pin for TPS51518RUKT?

The minimum external capacitor value on the SLEW pin for the TPS51518RUKT is 2.7 nF. This value ensures reliable operation during both soft-start (10 µA current source) and VID transitions (50 µA current source). Using a smaller capacitor may cause excessive output voltage overshoot or unstable VID slewing due to insufficient charge storage. For typical 1.2-V → 0.8-V transitions targeting 100-µs slew time, a 10-nF ceramic capacitor is commonly used. Always place the SLEW capacitor as close as possible to the pin with short, low-inductance traces to minimize noise coupling.

Does TPS51518RUKT require an external integrator capacitor for DC regulation?

Yes, the TPS51518RUKT requires an external integrator capacitor connected between the VREF and GND pins to achieve tight DC load regulation. This capacitor forms the dominant pole in the error amplifier's compensation network. TI recommends ≥1 µF ceramic (X7R/X5R) placed adjacent to VREF. For highest accuracy across temperature and load, TI specifies that the total resistance from VREF to GND (sum of all VID divider resistors) should exceed 67 kΩ to limit current-induced errors. Without this capacitor, regulation degrades significantly-especially under dynamic load steps-due to insufficient loop gain at low frequencies.

TPS51518RUKT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: D-CAP™, D-CAP2™

Package/Case:: 20-WFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Controller, 2-bit VID

Voltage - Input:: 3V ~ 28V

Number of Outputs:: 1

Voltage - Output:: 0.5V ~ 2V

Operating Temperature:: -10°C ~ 105°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-WQFN (3x3)

TPS51518RUKT FAQ

1.How can I place an order for TPS51518RUKT through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS51518RUKT 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 TPS51518RUKT reliable?

The price and inventory of TPS51518RUKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51518RUKT is usually 5 days.

3.What payment methods are accepted for TPS51518RUKT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51518RUKT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS51518RUKT?

TPS51518RUKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS51518RUKT 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 TPS51518RUKT?

For technical support, including TPS51518RUKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51518RUKT requirements.

6.How does Aetrix verify that TPS51518RUKT is sourced from the original manufacturer or authorized distributors?

All TPS51518RUKT 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 TPS51518RUKT meets industry standards.

7.What is the process for return or replacement of TPS51518RUKT?

All TPS51518RUKT units undergo pre-shipment inspection (PSI). If there is an issue with TPS51518RUKT, 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 TPS51518RUKT part is unused and in its original packaging.

Return procedure for TPS51518RUKT:

1.Submit a request within 90 days.

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

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