|Package | PIN:||DB | 20|
|Temp:||I (-40 to 85)|
- Step-Down DC-DC Converter
- 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
- TA = -40°C to 85°C
Texas Instruments TPS5103IDB
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 RT 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 r ds(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.