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

Texas Instruments TPS51020DBT

Name: TPS51020DBT
Brand: Texas Instruments
SKU: TPS51020DBT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS51020DBT

Manufacturer:: Texas Instruments

Category:: Special Purpose Regulators

Package:: 30-TFSOP (0.173", 4.40mm Width)

Datasheet:: TPS51020DBT.pdf

Description:: IC REG CTRLR DDR 2OUT 30TSSOP

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Product details

Overview

TPS51020DBT from Texas Instruments is a dual-synchronous step-down controller for notebook system power, supporting both independent dual-mode (0.85-V reference per channel) and DDR termination mode (VO1_VDDQ/2 tracking for VO2). It delivers 4.5–28-V input range, 180° interleaved phase operation, integrated 5-V/60-mA regulator, and RDS(on)-based overcurrent detection with 4200 ppm/°C temperature coefficient - used in DDR I/II termination and system bus I/O regulation.

For engineers reviewing the TPS51020DBT datasheet, TPS51020DBT pinout, TPS51020DBT application, or TPS51020DBT equivalent, this page provides verified functional identity, validated 30-pin TSSOP package mapping, confirmed dual-channel voltage-mode control architecture, exact DDR/dual-mode behavioral differences, and two manufacturer-validated alternative parts with documented technical divergence.

Technical Context

The TPS51020DBT implements feed-forward voltage-mode control with dual error amplifiers, each referencing either a precision 0.85-V internal reference (dual mode) or VO1_VDDQ/2 (DDR mode), enabling high efficiency without current-sense resistors. Its oscillator supports selectable 270/360/450-kHz switching via SSTRTx resistor networks, with automatic soft-start ramping and 180° interleave between channels to reduce input ripple.

It integrates boot-strapped high-side N-channel MOSFET drivers (VBST1/VBST2), low-side drivers with 2.5–3-Ω sink/source impedance, and autonomous autoskip mode for light-load efficiency - disabled only for Channel 2 in DDR mode. Overvoltage (OVP), undervoltage (UVP), and power-good timers are fully integrated, with PGOOD asserting after 2048 clock cycles once both outputs reach ±7.5% regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 28 V - supports Li-ion battery (3–4 cell) and adapter inputs without external pre-regulation.
Output Configuration	Dual synchronous buck with 180° phase shift - reduces input capacitor RMS current by ~30% vs. non-interleaved.
Reference Accuracy	±1% at 0.85 V (Channel 1); ±1.5% at VO1_VDDQ/2 (Channel 2, DDR mode) - enables tight DDR termination tolerance.
Overcurrent Detection	RDS(on)-based with 4200 ppm/°C TC - eliminates sense resistor loss while maintaining thermal stability across −40°C to 85°C.
Integrated Regulator	5-V/60-mA linear regulator (VREG5) - powers internal logic and gate drivers; bypassed by external 5-V on REG5_IN for higher system efficiency.
Switching Frequency	Selectable 270/360/450 kHz - higher frequencies allow smaller inductors; 450 kHz achievable only when both channels enabled.
Power Good Logic	Monitors both channels independently; asserts PGOOD only after both outputs stabilize within ±7.5% for ≥2048 clocks.

Pinout & Package

TPS51020DBT is housed in a 30-pin TSSOP (DBT) package with 0.5-mm pitch, thermally enhanced for notebook power delivery. Pin functions are validated per TI SLUS564C Rev. C (Oct. 2008) and match the top-view pinout diagram on page 3 of the datasheet.

Pin/Terminal	Circuit Role	Design Meaning
INV1, INV2	Error amplifier inverting input	Feedback node for VO1_VDDQ and VO2; also serves as OVP/UVP comparator input and skip comparator threshold point.
OUT1_U, OUT2_U	High-side N-MOSFET gate driver output	Drives upper FETs with integrated bootstrap diodes; requires external 0.1-µF ceramic capacitor between VBSTx and LLx.
OUT1_D, OUT2_D	Low-side N-MOSFET gate driver output	Sinks up to 60 mA; internal 2.5–3-Ω impedance enables direct drive of low-RDS(on) FETs without external buffers.
DDR	Mode selection input	Ground = DDR mode (VO2 references VO1_VDDQ/2, REF_X = VO1_VDDQ/2, SKIP disabled for Channel 2); >2.2 V = dual mode (VO2 references 0.85 V, REF_X = 10 V).
VREG5	5-V regulated output	Supplies internal circuitry and gate drivers; turns on if DDR, ENBL1, or ENBL2 >2.2 V; can be bypassed by external 5-V on REG5_IN.
PGOOD	Open-drain power-good indicator	Asserts high only when both channels are within ±7.5% regulation for ≥2048 oscillator cycles; ignored if corresponding ENBLx is low.

Key Features

Feature	Design Value
Feed-forward voltage-mode control	Eliminates need for current-sense resistor, preserving >90% efficiency at full load while maintaining fast line transient response.
Selectably enabled autoskip mode	Automatically transitions from PWM to hysteretic operation below ~10% load on Channel 1; disabled for Channel 2 in DDR mode to sustain VTT sink capability.
Integrated 5-V/60-mA regulator	Reduces external BOM count; supports seamless switchover to external 5-V supply on REG5_IN to lower VIN quiescent current by >50%.
DDR-specific termination architecture	Hardware-enforced VO2 = VO1_VDDQ/2 tracking, REF_X = VO1_VDDQ/2 buffer (3 mA capable), and forced PWM on VO2 for bidirectional VTT current handling.
180° interleaved dual-channel operation	Halves effective input ripple frequency, allowing smaller input bulk capacitors and reducing EMI filter size in space-constrained notebooks.

Applications

DDR I/II Memory Termination	Notebook System Bus Regulation
Use Scenario: Providing matched VDDQ and VTT supplies for DDR SDRAM interfaces in portable computing platforms. IC Role / Device Role / Timing Role: Dual-channel controller delivering VO1_VDDQ (1.8 V or 2.5 V) and VO2 = VO1_VDDQ/2 (0.9 V or 1.25 V) with <±1.5% tracking accuracy and simultaneous power-good assertion. Use Value: Eliminates discrete op-amps and reference ICs required for VTT tracking, reducing solution size by >40% and component count by 6+ parts.	Use Scenario: Generating core logic rails (e.g., 3.3 V, 5 V, 1.8 V) from main battery or adapter input in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual synchronous buck controller operating in independent dual mode with selectable 270/360/450-kHz switching and 180° interleaving. Use Value: Achieves >92% peak efficiency across 1–20 A loads while minimizing input capacitor stress and thermal footprint in thermally constrained chassis.
DDR Suspend-to-RAM (STR) Support	Multi-Rail Power Sequencing
Use Scenario: Maintaining stable VTT bias during S3 sleep states while disabling VDDQ to conserve power in DDR memory subsystems. IC Role / Device Role / Timing Role: Enabling STR-compliant operation via DDR pin control: grounding DDR disables VO2 regulation but retains REF_X = VO1_VDDQ/2 for VTT hold. Use Value: Supports instant resume from S3 without VTT re-stabilization delay, meeting JEDEC DDR timing requirements for tRFC and tRAS.	Use Scenario: Coordinating startup timing between CPU core, I/O, and memory rails using independent ENBL1/ENBL2 and SSTRT1/SSTRT2 soft-start controls. IC Role / Device Role / Timing Role: Programmable soft-start via external capacitors on SSTRT1/SSTRT2 pins, with independent enable/disable per channel via TTL-compatible ENBL inputs. Use Value: Enables precise rail sequencing (e.g., VDDQ before VTT) without external timers or microcontroller intervention, simplifying power management firmware.

DDR I/II Memory Termination

Notebook System Bus Regulation

Use Scenario: Providing matched VDDQ and VTT supplies for DDR SDRAM interfaces in portable computing platforms.

IC Role / Device Role / Timing Role: Dual-channel controller delivering VO1_VDDQ (1.8 V or 2.5 V) and VO2 = VO1_VDDQ/2 (0.9 V or 1.25 V) with <±1.5% tracking accuracy and simultaneous power-good assertion.

Use Value: Eliminates discrete op-amps and reference ICs required for VTT tracking, reducing solution size by >40% and component count by 6+ parts.

Use Scenario: Generating core logic rails (e.g., 3.3 V, 5 V, 1.8 V) from main battery or adapter input in ultraportable notebooks.

IC Role / Device Role / Timing Role: Dual synchronous buck controller operating in independent dual mode with selectable 270/360/450-kHz switching and 180° interleaving.

Use Value: Achieves >92% peak efficiency across 1–20 A loads while minimizing input capacitor stress and thermal footprint in thermally constrained chassis.

DDR Suspend-to-RAM (STR) Support

Multi-Rail Power Sequencing

Use Scenario: Maintaining stable VTT bias during S3 sleep states while disabling VDDQ to conserve power in DDR memory subsystems.

IC Role / Device Role / Timing Role: Enabling STR-compliant operation via DDR pin control: grounding DDR disables VO2 regulation but retains REF_X = VO1_VDDQ/2 for VTT hold.

Use Value: Supports instant resume from S3 without VTT re-stabilization delay, meeting JEDEC DDR timing requirements for tRFC and tRAS.

Use Scenario: Coordinating startup timing between CPU core, I/O, and memory rails using independent ENBL1/ENBL2 and SSTRT1/SSTRT2 soft-start controls.

IC Role / Device Role / Timing Role: Programmable soft-start via external capacitors on SSTRT1/SSTRT2 pins, with independent enable/disable per channel via TTL-compatible ENBL inputs.

Use Value: Enables precise rail sequencing (e.g., VDDQ before VTT) without external timers or microcontroller intervention, simplifying power management firmware.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS51116PWP	Single-chip DDR3 solution with integrated MOSFETs (30-V max), 0.6-V reference, and programmable VTT sink/source; no external high-side drivers required.	Targets DDR3 systems requiring ≤25-A VDDQ; lacks 28-V input support and RDS(on) OCP - uses current-sense resistors instead.	Choose TPS51116PWP for DDR3 designs needing integrated FETs and simplified layout; retain TPS51020DBT for DDR I/II with 28-V input or discrete FET flexibility.
ISL95831IRZ	3-phase controller with digital interface (SVID), 0.3–1.5-V output range, and adaptive voltage positioning (AVP); supports Intel VR12.5/VR12.6.	Designed for CPU core VR applications; no DDR termination features (no VO1_VDDQ/2 tracking or VTT reference); requires PMBus host.	Choose ISL95831IRZ for CPU core power with dynamic AVP; select TPS51020DBT for memory subsystems where DDR-specific analog control and tracking are mandatory.

Compared with TPS51116PWP and ISL95831IRZ, the TPS51020DBT uniquely combines 28-V input tolerance, RDS(on)-based OCP, hardware-enforced DDR termination tracking, and discrete FET driver flexibility - making it irreplaceable for legacy DDR I/II notebook memory power where integration or digital control is not required.

Availability

TPS51020DBT is available at Aetrix Electronics and suitable for notebook system bus regulation, DDR I/II termination, and multi-rail power sequencing requiring stable component supply across extended product lifecycles.

Supply support for TPS51020DBT 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 TPS51020DBT belongs to TI's notebook power controller product line, engineered specifically for high-efficiency, low-noise, dual-rail DC/DC conversion in space- and thermal-constrained mobile platforms - emphasizing DDR compatibility, input voltage flexibility, and minimal external component count.

FAQ

What is the function of the DDR pin on the TPS51020DBT?

The DDR pin on the TPS51020DBT selects between dual-mode and DDR-mode operation. When grounded (<0.3 V), it configures the device for DDR termination: VO2 references VO1_VDDQ/2, REF_X outputs VO1_VDDQ/2 (3 mA capable), and autoskip is disabled for Channel 2 to maintain VTT sink capability. When pulled >2.2 V, it enables independent dual-mode operation with 0.85-V references per channel and 10-V REF_X output. Toggling DDR while ENBL1 or ENBL2 is high is prohibited per datasheet caution.

Does the TPS51020DBT support both DDR I and DDR II standards?

Yes, the TPS51020DBT supports both DDR I and DDR II termination requirements. In DDR mode, it delivers VO1_VDDQ (configurable for 2.5 V or 1.8 V) and VO2 = VO1_VDDQ/2 (1.25 V or 0.9 V) with ≤±1.5% tracking accuracy and simultaneous PGOOD assertion - meeting JEDEC specifications for VTT regulation tolerance and timing in both DDR generations. Its 4.5–28-V input range accommodates typical DDR I/II system bus voltages.

How does the TPS51020DBT achieve overcurrent protection without a sense resistor?

The TPS51020DBT implements RDS(on)-based overcurrent detection by monitoring the voltage drop across the high-side MOSFET's intrinsic on-resistance. The TRIP1 and TRIP2 pins connect to the MOSFET source via a small resistor network, enabling current sensing with 4200 ppm/°C temperature coefficient compensation. This eliminates external sense resistors, preserving >90% efficiency at full load while maintaining accurate fault detection across −40°C to 85°C ambient.

Can the TPS51020DBT operate with an external 5-V supply instead of VIN?

Yes, the TPS51020DBT supports external 5-V biasing via the REG5_IN pin. When REG5_IN is driven with ≥4.7 V, the internal 5-V linear regulator (VREG5) shuts off and VREG5 output switches to the external supply. This reduces VIN quiescent current by >50%, improving overall system efficiency. The datasheet specifies that REG5_IN must not exceed VIN voltage, and recommends connecting VIN to REG5_IN when a clean 5-V rail is available.

What are the valid switching frequencies for the TPS51020DBT and how are they selected?

The TPS51020DBT supports three fixed switching frequencies: 270 kHz (default start-up), 360 kHz, and 450 kHz. Selection is made by configuring resistor networks on SSTRT1 and SSTRT2 pins per Table 1 in SLUS564C: open = 450 kHz, 1-MΩ to GND = 270 kHz, and mixed configurations yield 360 kHz. Maximum 450 kHz is only achievable when both channels are enabled; 270 kHz is used throughout soft-start regardless of final target frequency.

TPS51020DBT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 30-TFSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Active

Applications:: Controller, DDR

Voltage - Input:: 4.5V ~ 28V

Number of Outputs:: 2

Voltage - Output:: 0.9V ~ 24V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 30-TSSOP

TPS51020DBT FAQ

1.How can I place an order for TPS51020DBT through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS51020DBT 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 TPS51020DBT reliable?

The price and inventory of TPS51020DBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51020DBT is usually 5 days.

3.What payment methods are accepted for TPS51020DBT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51020DBT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS51020DBT?

TPS51020DBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS51020DBT 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 TPS51020DBT?

For technical support, including TPS51020DBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51020DBT requirements.

6.How does Aetrix verify that TPS51020DBT is sourced from the original manufacturer or authorized distributors?

All TPS51020DBT 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 TPS51020DBT meets industry standards.

7.What is the process for return or replacement of TPS51020DBT?

All TPS51020DBT units undergo pre-shipment inspection (PSI). If there is an issue with TPS51020DBT, 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 TPS51020DBT part is unused and in its original packaging.

Return procedure for TPS51020DBT:

1.Submit a request within 90 days.

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

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