TPS51225 TPS51225RUKR IC
Product Title: TPS51225 / TPS51225RUKR (Marking: 1225 / TPS51225) Dual Synchronous Step-Down Controller IC for 3.3V / 5V Laptop Standby Power (VQFN-20)
Product Specifications:
- Part Number / Marking: TPS51225 / TPS51225RUKR (Top Marking Code: 1225 / TPS51225)
- Device Type: Dual Synchronous Step-Down (Buck) Controller IC with Integrated LDOs
- Package / Case: VQFN-20 / RUK-20 (20-Pin Very Thin Quad Flat No-Lead, 3x3mm with Exposed Thermal Pad)
- Input Voltage Range ($V_{IN}$): $5.5\text{V to }24\text{V DC}$ (Primary Battery / Power Adapter Rail)
- Control Architecture: D-CAP2™ Mode Control for Fast Dynamic Transient Response (No external compensation network needed)
- Switching Frequency: $400\text{ kHz}$ (Channel 1) & $475\text{ kHz}$ (Channel 2)
- Operating Temperature Range:$-40^\circ\text{C}\text{ to }+85^\circ\text{C}$
Short Description: High-efficiency Texas Instruments TPS51225 (top marking: 1225) dual synchronous step-down PWM controller IC in a compact 20-pin VQFN package. Specifically engineered to generate the primary $3.3\text{V}$ and $5\text{V}$ standby power rails (3VALW / 5VALW) on laptop motherboards and compact system boards. Integrates dual always-on low-dropout linear regulators ($3.3\text{V}$ and $5\text{V}$ LDOs) to power the Embedded Controller (EC) prior to main board startup. Essential replacement component for resolving dead laptop motherboards, missing $3.3\text{V}/5\text{V}$ power rails, short-circuit power trips, and system power-on failure.
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