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The TPS51125ARGER is a cost-effective dual synchronous buck controller designed specifically for laptop power supply solutions. The device features 5V and 3.3V low-dropout regulators (LDOs) and requires only a minimal number of external components. The 270 kHz VCLK output can be used to drive an external charge pump, thereby generating gate drive voltage for the load switch without compromising the efficiency of the main converter. The TPS51125ARGER supports high efficiency, fast transient response, and provides combined power good signals. Audio-free mode light load operation achieves low acoustic noise at higher efficiency than traditional forced PWM operation. Adaptive on-time D-CAP control enables convenient and efficient operation. The device supports input supply voltages from 5.5 V to 28 V and output voltages from 2 V to 5.5 V. The TPS51125ARGER is available in a 24-pin QFN package with an operating temperature range of –40°C to 85°C.

Core Features — TPS51125ARGER

Dual synchronous buck control: Supports output voltages from 2 V to 5.5 V with a maximum output current of 20 A.

Integrated 100 mA LDO: Provides 5 V/3.3 V auxiliary power, reducing the need for external components.

270kHz VCLK output: Drives external charge pumps to optimise load switch gate drive.  

Adaptive D-CAP™ control architecture: Provides fast transient response and optimises light-load efficiency.  

Multiple protection mechanisms: Overvoltage protection (OVP), undervoltage protection (UVP), overcurrent protection (OCP), and thermal shutdown (non-lockout).

Key Features — TPS51125ARGER

Wide input voltage range: 5.5V to 28V (supports 4.5V startup).  

Output voltage range: 2V to 5.5V (adjustable).  

High-efficiency synchronous rectification: Supports Out-of-Audio™ mode to reduce light load noise.  

Low static current: Only 0.55mA, optimising standby power consumption.

Adjustable Switching Frequency: 300kHz to 460kHz (to accommodate different application requirements).  

Soft-Start Function: 1.6ms voltage-servo soft-start to prevent inrush current.

Technical Specifications — TPS51125ARGER

Model: TPS51125ARGER  

Package: 24-VQFN (4×4mm)  

Input Voltage Range: 5.5V to 28V

Output voltage range: 2V to 5.5V  

Output current (maximum): 20A  

Switching frequency: 300kHz to 460kHz  

Quiescent current (Iq): 0.55mA  

Operating temperature: -40°C to +85°C

Synchronous rectification: Supported  

Protection features: OVP/UVP/OCP/Thermal shutdown

Typical applications — TPS51125ARGER  

Laptop power management: CPU/GPU power supply, memory power rails.  

Industrial power systems: PLC, HMI devices.  

Consumer electronics: Smart TVs, set-top boxes.  

Network equipment: Switches, routers DC-DC conversion.

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