Overview
The TPS51225RUKR from Texas Instruments is a dual synchronous, step-down controller designed for cost-effective power supply solutions in notebook computers, netbooks, and tablet computers. This device integrates 5-V and 3.3-V linear low-dropout regulators (LDOs) and requires minimal external components. It operates within an input voltage range of 5.5 V to 24 V and provides adjustable output voltages with high accuracy.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Voltage Range | 5.5 | 24 | V | |
| Output Voltages | 5 V (Adjustable ±10%) | 3.3 V (Adjustable ±10%) | V | |
| LDO Outputs | 5 V, 100 mA | 3.3 V, 100 mA | ||
| Switching Frequency | 300 kHz / 355 kHz | |||
| Clock Output Frequency | 260 kHz | |||
| Package Type | 20-Pin QFN (RUK) | |||
| Junction Temperature | 150 | °C | ||
| UVLO Threshold (VIN) | 4.38 | 4.58 | V |
Key Features
- Dual synchronous buck controller with adaptive on-time D-CAP™ mode control, requiring no external compensation circuit.
- Built-in 100-mA, 5-V and 3.3-V LDOs.
- Clock output for charge pump (260 kHz).
- ±1% reference accuracy.
- Overcurrent protection with temperature-compensated MOSFET RDS(on) sensing.
- Soft-start operation with internal voltage servo soft-start for each channel.
- Output overvoltage and undervoltage protection.
- Thermal shutdown protection.
- Always ON 3.3-V LDO (VREG3) and optional Always ON 5-V LDO (VREG5) in TPS51225C.
Applications
- Notebook computers
- Netbook and tablet computers
- Other portable electronic devices requiring efficient and compact power supply solutions.
Q & A
- What is the input voltage range of the TPS51225RUKR? The input voltage range is from 5.5 V to 24 V.
- What are the output voltages provided by the TPS51225RUKR? The device provides adjustable output voltages of 5 V and 3.3 V with ±10% accuracy.
- What type of LDOs are integrated into the TPS51225RUKR? The device includes 100-mA, 5-V and 3.3-V LDOs.
- What is the switching frequency of the TPS51225RUKR? The switching frequency is 300 kHz or 355 kHz.
- Does the TPS51225RUKR have a clock output for charge pump? Yes, it provides a 260-kHz clock output for charge pump applications.
- What kind of overcurrent protection does the TPS51225RUKR offer? It features cycle-by-cycle overcurrent limiting control with temperature-compensated MOSFET RDS(on) sensing.
- How does the soft-start operation work in the TPS51225RUKR? The device operates an internal, 0.8-ms, voltage servo soft-start for each channel to smoothly ramp up the output voltage during start-up.
- What is the package type of the TPS51225RUKR? The device is packaged in a 20-Pin QFN (RUK).
- What is the junction temperature limit for the TPS51225RUKR? The junction temperature should not exceed 150°C.
- Does the TPS51225RUKR have thermal shutdown protection? Yes, it includes thermal shutdown protection to prevent overheating.
