STEP-DOWN CONTROLLER WITH 5-V AND 3.3-V LDOS -TPS51123ARGET TPS51123ARGER 5I123A S1123A 51I23A TPS 51123A TPS51123A QFN24

The TPS51123 is a cost-effective, dual-synchronous buck controller targeted for notebook system power supply solutions. It provides 5-V and 3.3-V LDOs and requires few external components. The TPS51123 supports high efficiency, fast transient responses, and provides a combined power-good signal. Out-of- Audio™ mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP™ 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 TPS51123 is available in a 24-pin QFN package and
is specified from -40°C to 85°C ambient temperature range.

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 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 R DS(on) Current Sensing
• Built-In Output Discharge
• Power Good Output
• Built-in OVP/UVP/OCP
• Thermal Shutdown (Non-latch)
• 24-Pin QFN (RGE) Package

APPLICATIONS

• Notebook Computers
• I/O Supplies
• System Power Supplies