6.4 Buck1 (BK1) Switching Regulator
The IS2083BM includes a built-in programmable output voltage regulator which converts the battery voltage to 1.5V to supply the RF and baseband power supply. This converter has high conversion efficiency and fast transient response.
Note: Do not
                                                connect any other devices to buck1 regulator output
                                                pin (BK1_VOUT).
                        