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Texas Instruments FX026
- Part No.:
- FX026
- Manufacturer:
- Texas Instruments
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FX026.pdf
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Product details
Overview
TPS51362 from Texas Instruments is a 22-V input, 10-A integrated FET synchronous buck converter with DCAP-2™ control architecture, ULQ™ low-power mode (100 µA quiescent current), 800 kHz fixed switching frequency, and 0.6 V to 2 V programmable output voltage - designed for DDR memory VDDQ and notebook VCCIO rails.
For engineers reviewing the TPS51362 datasheet, TPS51362 pinout, TPS51362 application, or TPS51362 equivalent, key selection criteria include integrated high/low-side FETs (RDS(on)H = 17.5 mΩ, RDS(on)L = 8.75 mΩ), differential voltage sensing (VSNS/GSNS), ULQ™ enable via LP# pin, and support for all-MLCC output capacitors without external compensation.
Technical Context
The TPS51362 implements adaptive on-time DCAP-2™ control using internal phase compensation (dual 8 kHz zeros) and an integrator formed by the SLEW pin capacitor and 60 µS transconductance amplifier. It supports auto-skip light-load operation and zero-crossing detection to prevent negative inductor current.
Protection architecture includes valley-current-based overcurrent limit (programmable at 8 A or 12 A via TRIP pin), non-latching thermal shutdown (140 °C), OVP (120% of setpoint), UVP (66% of setpoint), and 5-V UVLO with POR reset. Power-good assertion occurs after 1.5 ms delay once output reaches ±8% of target.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 22 V - supports wide-input notebook and industrial POL applications without pre-regulation. |
| Output Current | 10 A continuous - enables single-chip solution for DDR3/DDR4 VDDQ and VCCIO rails up to 6 A dynamic load. |
| Switching Frequency | 800 kHz - balances size (0.33 µH inductor), efficiency (>90% at 10 A), and EMI performance. |
| ULQ™ Quiescent Current | 100 µA - extends battery life during system standby by reducing bias current when LP# is asserted. |
| Output Voltage Range | 0.6 V to 2.0 V - covers DDR3 (1.5 V), DDR4 (1.2 V), LPDDR4 (1.1 V), and Intel VCCIO (1.05 V) standards. |
| On-Resistance (HS/LS) | 17.5 mΩ / 8.75 mΩ - minimizes conduction loss and thermal rise at full load in 3.5 mm × 4.5 mm QFN package. |
| Soft-Start Control | Programmable via SLEW pin capacitor - enables precise startup ramp (e.g., 1 ms for 1.05 V) to limit inrush current. |
Pinout & Package
Package: 28-pin, 3.5 mm × 4.5 mm, 0.4-mm pitch, RVE QFN with exposed thermal pad (1 mm height), rated for –10°C to 85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 28) | Enable input | 1.05-V logic-compatible signal; must be ≥0.9 V to activate converter; includes 0.25 V hysteresis. |
| LP# (Pin 2) | Low-power mode control | Active-low input enabling ULQ™ mode; pulls quiescent current from 560 µA to 100 µA. |
| REFIN / REFIN2 (Pins 25/24) | Output voltage setpoint configuration | Resistorless fixed-voltage selection: GND/GND = 1.05 V, GND/Float = 1.5 V, Float/GND = 1.2 V, Float/Float = 1.35 V. |
| VREF (Pin 26) | 2.0-V reference output | Stable 2.0 V source with 300 µA drive capability; used with external resistor divider for adjustable outputs. |
| VSNS / GSNS (Pins 22/23) | Differential output voltage sense | Enables accurate remote sensing across PCB traces; rejects common-mode noise and ground bounce. |
| SLEW (Pin 21) | Soft-start integrator node | Connects to external capacitor to define startup ramp rate; internal 10 µA current source sets timing. |
| TRIP (Pin 20) | Overcurrent limit programming | GND = 8 A OCL threshold; 5 V = 12 A OCL threshold - sets valley-current trip point per cycle. |
| BST (Pin 5) | Bootstrap supply for HS gate driver | Requires 0.1 µF ceramic capacitor to SW; enables high-side MOSFET drive without external charge pump. |
| PGOOD (Pin 1) | Power-good status indicator | Open-drain output asserting after 1.5 ms once output enters ±8% window; deasserts instantly on OVP/UVP. |
| SW (Pins 6–9, 13, 17, 20) | Switching node | High-current connection to external inductor; multiple pins reduce resistance and improve thermal dissipation. |
| PGND (Pins 10–12, 14–16, 19) | Power ground return | Dedicated low-impedance path for high di/dt currents; separate from analog GND to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| DCAP-2™ Adaptive On-Time Control | Enables stable regulation with POSCAP or all-MLCC output capacitors - eliminates need for external compensation network. |
| Integrated High/Low-Side FETs | RDS(on)H = 17.5 mΩ and RDS(on)L = 8.75 mΩ - reduces BOM count and improves thermal performance in compact layout. |
| ULQ™ Low-Power Mode | Reduces quiescent current from 560 µA to 100 µA during system standby - directly extends battery runtime in notebook platforms. |
| Differential Voltage Sensing | VSNS/GSNS inputs reject PCB trace IR drop and ground bounce - maintains ±0.5% output accuracy under dynamic load steps. |
| Programmable Overcurrent Limit | Two OCL thresholds (8 A or 12 A) selected via TRIP pin - allows design margin tuning without changing layout or components. |
Applications
| DDR Memory Power Rail | Notebook VCCIO Supply |
|---|---|
Use Scenario: Powers DDR4/LPDDR4 memory modules requiring tightly regulated 1.2 V or 1.1 V with fast transient response to burst data access. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 10 A with <100 ns PGOOD assertion delay and ±0.5% DC accuracy. Use Value: Meets JEDEC DDR4 VDDQ ripple spec (<20 mVpp) using 6×22 µF MLCCs and achieves >92% efficiency at 6 A/1.2 V. | Use Scenario: Supplies Intel platform VCCIO rail (1.05 V) in ultrabooks where space and battery life are critical constraints. IC Role / Device Role / Timing Role: Single-chip POL converter with integrated FETs, soft-start, and ULQ™ mode for system-level power sequencing. Use Value: Enables 1.05 V output with 100 µA quiescent current in LP#-enabled standby - extends idle battery life by >30% vs. standard buck ICs. |
| Industrial Point-of-Load Converter | FPGA I/O Bank Supply |
Use Scenario: Delivers 1.8 V at 8 A to industrial PLC I/O modules operating from 12 V or 24 V intermediate bus. IC Role / Device Role / Timing Role: High-density buck regulator with 800 kHz switching and thermal shutdown protection for harsh environments. Use Value: Maintains regulation across –10°C to 85°C ambient using only 3.5 mm × 4.5 mm footprint and no external compensation. | Use Scenario: Powers Xilinx Artix-7 FPGA I/O banks requiring 1.8 V or 2.5 V with precise sequencing relative to core voltage. IC Role / Device Role / Timing Role: Programmable-output buck converter supporting fixed-voltage modes and PGOOD-driven enable interlock. Use Value: Achieves <1% output deviation under 5 A step load (2 A/µs) using DCAP-2™ control and differential sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51363 | Same pinout and DCAP-2™ architecture; adds V5 regulator with 500 mA output and integrated LDO for auxiliary rails. | Supports dual-rail systems (e.g., DDR VDDQ + VTT termination) without external 5-V supply. | Select TPS51363 when auxiliary 5-V rail generation is required; otherwise TPS51362 offers lower cost and simpler BOM. |
| ISL95831 | 8-A rating, 3–24 V input, 500 kHz switching; uses voltage-mode control with external compensation. | Lacks ULQ™ mode and differential sensing; requires external RC network for stability with MLCCs. | Choose ISL95831 only if legacy voltage-mode design flow or lower-frequency EMI profile is mandatory. |
Compared with TPS51363, the TPS51362 provides identical power stage performance at lower system cost and complexity but lacks integrated 5-V generation; versus ISL95831, it delivers superior light-load efficiency, faster transient response, and simpler layout due to DCAP-2™ and ULQ™.
Availability
TPS51362 is available at Aetrix Electronics and suitable for DDR memory power rails, notebook VCCIO supplies, and industrial point-of-load converters requiring stable component supply, long-term lifecycle support, and TI-qualified production lots.
Supply support for TPS51362 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 over 50 years of innovation in high-reliability power conversion.
The TPS51362 belongs to TI's DC/DC integrated-FET buck converter product line, engineered specifically for high-current, low-voltage memory and processor I/O rails in portable and space-constrained computing platforms.
FAQ
What is the minimum input voltage required for stable operation of the TPS51362?
The TPS51362 operates stably down to 3 V input voltage, as specified in the Recommended Operating Conditions table. Below this threshold, UVLO activates and disables the converter. At VIN = 3 V, the device still delivers full 10-A output capability when configured for 0.6 V output, provided thermal limits are observed and layout minimizes input path impedance.
How does the TPS51362 achieve stable regulation without external compensation components?
The TPS51362 achieves stable regulation using TI's proprietary DCAP-2™ adaptive on-time control architecture, which embeds internal phase compensation (dual 8 kHz zeros) and integrates a transconductance amplifier with the SLEW pin capacitor. This eliminates the need for external RC networks while supporting POSCAP, mixed, or all-MLCC output capacitor configurations.
Can the TPS51362 be used with only ceramic output capacitors?
Yes, the TPS51362 is explicitly designed for all-MLCC output capacitor usage. Its DCAP-2™ control loop compensates for the near-zero ESR of ceramic capacitors, and the internal compensation network ensures stability without requiring tantalum or polymer capacitors - verified across 6×22 µF and 10×10 µF MLCC arrays.
What happens to the TPS51362 when the LP# pin is pulled low?
When the LP# pin is pulled low, the TPS51362 enters ULQ™ (Ultra-Low Quiescent) mode, reducing its quiescent supply current from 560 µA to 100 µA. The converter remains fully functional and regulates output voltage, but bias current drops significantly - extending battery life during system standby without compromising wake-up time or regulation accuracy.
Is the TPS51362 pin-compatible with other devices in the TPS5136x family?
Yes, the TPS51362 is pin-compatible with the TPS51363 and TPS51364 in the same RVE QFN-28 package. All share identical pin assignments for power, control, and sensing functions. Differences lie in feature sets - e.g., TPS51363 adds integrated 5-V LDO, while TPS51364 supports higher 12-A current - but PCB layout and routing remain interchangeable.
FX026 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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FX026 FAQ
1.How can I place an order for FX026 through Aetrix?
Please submit a Request for Quotation (RFQ) for FX026 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 FX026 reliable?
The price and inventory of FX026 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FX026 is usually 5 days.
3.What payment methods are accepted for FX026?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FX026 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FX026?
FX026 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FX026 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 FX026?
For technical support, including FX026 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FX026 requirements.
6.How does Aetrix verify that FX026 is sourced from the original manufacturer or authorized distributors?
All FX026 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 FX026 meets industry standards.
7.What is the process for return or replacement of FX026?
All FX026 units undergo pre-shipment inspection (PSI). If there is an issue with FX026, 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 FX026 part is unused and in its original packaging.
Return procedure for FX026:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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