TI TPS5103IDBR

The TPS5103 is a synchronous buck dc/dc controller, designed for notebook PC system power. The controller has three user-selectable operation modes available: hysteretic mode, fixed-frequency PWM control, or SKIP control. In high-current applications, where fast transient response is advantageous for reducing bulk capacitance, the hysteretic mode is selected by connecting the R_T pin to VREF5. Selecting the PWM/SKIP modes for less demanding transient applications is ideal for conserving notebook battery life under light load conditions. The device includes high-side and low-side MOSFET drivers capable of driving low rds(on) N-channel MOSFETs. The user-selectable overcurrent protection (OCP) threshold is set by an external TRIP-pin resistor in order to protect the system. The TPS5103 is configured so that a current-sense resistor is not required, improving the operating efficiency.

• Three Operation-Modes – Heavy Load: – Fixed Frequency PWM – Hysteretic (User Selectable) Light Load: – Skip Mode
• 4.5-V to 25-V Input Voltage Range
• Adjustable Output Voltage Down to 1.2 V
• 95% Efficiency
• Standby Control
• Overcurrent Protection
• UVLO for Internal 5-V Regulation
• Low-Standby Current... 0.5 mA Typical T_A=-40°C to 85°C