TPS51125RGER Datasheet

DC/DC Switching Controllers


The TPS51125RGER is a cost effective, dual-synchronousbuck controller targeted for notebook system powersupply solutions. It provides 5-V and 3.3-V LDOs andrequires few external components. The 270-kHzVCLK output can be used to drive an external chargepump, generating gate drive voltage for the loadswitches without reducing the main converter’sefficiency. The TPS51125 supports high efficiency,fast transient response and provides a combinedpower-good signal. Out-of-Audio™ mode light-loadoperation enables low acoustic noise at much higherefficiency than conventional forced PWM operation.Adaptive on-time D-CAP™ control providesconvenient and efficient operation. The part operateswith supply input voltages ranging from 5.5 V to 28 Vand supports output voltages from 2 V to 5.5 V. TheTPS51125 is available in a 24-pin QFN package andis specifed from -40°C to 85°C ambient temperaturerange. TPS51125RGER Features • 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 SelectableLight Load and PWM only Operation• Internal 1.6-ms Voltage Servo Softstart• Adaptive On-Time Control Architecture withFour 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)• QFN, 24-Pin (RGE) TPS51125RGER Applications • Notebook Computers• I/O Supplies• System Power Supplies


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