TPS51125ARGER

FEATURE

• Wide Input Voltage Range: 5.5 V to 28 V 

• Output Voltage Range: 2 V to 5.5 V 

• Built-in 100-mA 5-V/3.3-V LDO with Switches

• Built-in 1% 2-V Reference Output

• With/Without Out-of-Audio™ Mode Selectable Light Load and PWM only Operation

• Internal 1.6-ms Voltage Servo Softstart

• Adaptive On-Time Control Architecture with Four Selectable Frequency Setting

• 4500 ppm/°C RDS(on) Current Sensing

• Built-In Output Discharge

• Power Good Output

• Built-in OVP/UVP/OCP

• Thermal Shutdown (Non-latch)

• QFN24 (RGE)

APPLICATIONS

• Notebook Computers

• I/O Supplies

• System Power Supplies

DESCRIPTON


The TPS51125A is a cost effective, dual-synchronous buck controller targeted for notebook system power supply solutions. It provides 5-V and 3.3-VLDOs and requires few external components. The 270-kHz VCLK output can be used to drive an exteral charge pump, generating gate drive voltage for the load switches without reducing the main converter's efficiency. The TPS51125A supports high efficiency, fast transient response and provides a combined power-good signal. Out-of-Audiom mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAPm control provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to 28 V and supports output voltages from 2 V to 5.5 V. The TPS51125A is available in a 24-pin QFN package and is specified from -40℃℃ to 85°C ambient temperature range.

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