SWRA640G December 2018 – September 2022 CC1310 , CC1312R , CC1314R10 , CC1350 , CC1352P , CC1352R , CC1354P10 , CC1354R10 , CC2620 , CC2630 , CC2640 , CC2640R2F , CC2640R2F-Q1 , CC2642R , CC2642R-Q1 , CC2650 , CC2652P , CC2652R , CC2652R7 , CC2652RB , CC2652RSIP , CC2662R-Q1 , CC2674P10 , CC2674R10
Maximum efficiency is obtained by using the internal DC/DC converter, and it requires an external inductor (LDCDC) and capacitor (CDCDC). The components should be placed as close as possible to the CC13xx/CC26xx device and it is important to have a short current return path for from the CDCDC ground to the pad on the chip (see Section 4.7). In addition, the bulk capacitor on VDDS should be placed close to the VDDS_DCDC-pin. The actual value of LDCDC, CDCDC and CBULK vary from device to device. For the actual values, see the device-specific reference design.
When operating in DC/DC mode, the power system dynamically switches between the Global LDO and DC/DC converter depending on the required load to achieve maximum efficiency. If VDDS drops below 2.0 V, the DC/DC converter will be less efficient than the LDO and the device will run in global LDO mode. For systems operating with VDDS less than 2.0 V, consider either global LDO or external regulator mode to save component cost and board area.
The following software setup is required in the CCFG to use the DC/DC converter:
#ifndef SET_CCFG_MODE_CONF_DCDC_RECHARGE
#define SET_CCFG_MODE_CONF_DCDC_RECHARGE 0x0 // Use the DC/DC during recharge in powerdown
// #define SET_CCFG_MODE_CONF_DCDC_RECHARGE 0x1 // Do not use the DC/DC during recharge in powerdown
#endif
#ifndef SET_CCFG_MODE_CONF_DCDC_ACTIVE
#define SET_CCFG_MODE_CONF_DCDC_ACTIVE 0x0 // Use the DC/DC during active mode
// #define SET_CCFG_MODE_CONF_DCDC_ACTIVE 0x1 // Do not use the DC/DC during active mode
#endif