The TPS61288 is a fully-integrated synchronous boost converter with a 6.5-mΩ power switch and a 8.5-mΩ rectifier switch to output high power from a single cell or two-cell Lithium batteries. The device is capable of providing an output voltage of 18 V and delivering up to 35-W power from a single cell Lithium battery and 45-W power from a two cells Lithium battery.

The TPS61288 employs the peak current control topology with the SOO modulation to regulate the output voltage. In the moderate-to-heavy load condition, the TPS61288 operates in the quasi-constant frequency pulse width modulation (PWM) mode. As conventional adaptive off-time converters, the device varies the off-time as a function of input and output voltage to maintain a nearly constant frequency 500 kHz. In the light load condition, the device runs in the pulse frequency modulation (PFM) mode. Off-time is modulated by the feedback loop and extended as load becoming lighter. Zero current detection in high-side N-MOSFET enables the device running in discontinuous conduction mode (DCM) to optimize light-load efficiency. The TPS61288 implements the cycle-by-cycle current limit to protect the device from overload conditions during boost switching. The typical switch peak current limit is 15 A. The TPS61288 uses external loop compensation, which provides flexibility to use different inductors and output capacitors. The peak current control scheme gives excellent transient line and load response with minimal output capacitance.