TPS5103

Features:

Step-Down DC-DC Converter
Three Operation-Mode
     Heavy Load:
     Fixed Frequency PWM
     Hysteretic (User Selctable)
     Light Load:
     Skip Mode
4.5 V to 25 V Input Voltage Range
Adjustable Output Voltage Down to 1.2 V
95% Efficiency
Stand-By Control
Over Current Protection
UVLO for Internal 5 V Regulation
Low Standby Current . . . 0.5 mA Typical
TA = 40°C to 85°C


Pinout




Specifications

Supply voltage, V_CC (see Note 1)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 27 V
Input voltage, V_I, INV, C_T, R_T, PWM/SKIP, SOFTSTART, COMP  . . . . . . . . . . . . . . . . . . . .  . . . 0.3 V to 7 V
Input voltage, VREG5V_IN  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to 6 V
Input voltage, STBY   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 15 V
Input voltage, TRIP, VCC_SENSE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 0.3 V to 27 V
Output current, I_O   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  A
Low level output voltage, V_OL   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .0.3 V to 27 V
High level output voltage, V_OH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to 32 V
Reference voltage, V_ref   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . .0.3 V to 3 V
Operating free-air temperature range, T_A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . 40°C to 85°C
Operating virtual junction temperature range, T_J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125°C 
Storage temperature range, T_stg  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 150°C   


Description

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 of TPS5103  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 TPS5103 includes high-side and low-side MOSFET drivers capable of driving low Rds (on) Nchannel MOSFETs.
The user-selectable overcurrent protection (OCP) threshold is set by an external TRIP pin resister in order to protect the system.  The TPS5103 is configured so that a current sense resistor is not required, improving the operating efficiency.