TPS51125

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS51125 SLUS786H – OCTOBER 2007 – REVISED JANUARY 2015 TPS51125 Dual-Synchronous, Step-Down Controller With Out-of-Audio™ Operation and 100-mA LDOS for Notebook System Power 1 Features 1 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 and 3.3-V LDO With Switches Built-In 1% 2-V Reference Output With or Without Out-of-Audio™ Mode Selectable Light-Load and PWM-Only Operation Internal 1.6-ms Voltage Servo Soft-Start Adaptive On-Time Control Architecture With Four Selectable Frequency Setting 4500 ppm/°C RDS(on) Current Sensing Built-In Output Discharge Powergood Output Built-In OVP/UVP/OCP Thermal Shutdown (Nonlatch) QFN, 24-Pin (RGE) 2 Applications Notebook Computers I/O Supplies System Power Supplies 3 Description The TPS51125 is a cost-effective, dual-synchronous buck controller targeted for notebook system power supply solutions. The device provides 5-V and 3.3-V LDOs and requires few external components. The 270-kHz VCLK output can be used to drive an external charge pump, thus generating gate drive voltage for the load switches without reducing the efficiency of the main converter. The TPS51125 supports high-efficiency, fast-transient response and provides a combined power-good signal. Out-ofAudio mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM ...