TS51221 High Efficiency Regulator IC for Wireless Power Receiver Applications TRIUNE PRODUCTS Features Description Fixed output voltage choices: 1.5V, 1.8V, 2.5V, 3.3V, and 5V The TS51221 is a high- efficienc y regulator device for low- with +/- 2% output tolerance power wireless power receiver applications. The switching Adjustable version output voltage range: 0.9V to 5.5V with frequenc y of 1MH z enables the use of small filter components +/- 1.5% reference resulting in minimal board space and reduced BOM costs. Wide input voltage range: 4.5V to 24V 1MH z +/- 10% fixed switching frequenc y The TS51221 integrates a wide range of protec tion circuitr y I nput under voltage lockout Full protec tion for over- cur rent, over-temperature, and including input supply under-voltage lockout, output voltage V over-voltage sof t star t, cur rent limit, and ther mal shutdown. OUT Low ex ter nal component count Summary Specification Applications Junc tion operating temperature -40 C to 125 C Wireless Charging for por table devices Pack aged in a 16pin QFN (3x3) Wear-ables, medical monitors Bluetooth headsets Smar t watches Typical Application Circuit Application DC TS51231 TS51221 Processor Supply Application Load Processor Transmitter Receiver TS51221 1 of 18 www.semtech.com Final Datasheet Rev 1.1 April 6, 2015 SemtechVSW PG PGND NC PGND NC VSW FB Pinout VSW VSW PIN 1 VCC VCC TS51221 VCC BST GND EN Figure 1: 16 Lead 3x3 QFN, Top View Pin Description Pin Pin Name Pin Function Description 1 VSW Switching Voltage Node Connec ted to 4.7uH (t ypical) induc tor 2 VCC I nput Voltage I nput voltage 3 VCC I nput Voltage I nput voltage Pr imar y ground for the major it y of the device except the low-side 4 GND GND power FE T R egulator FB Voltage. Connec ts to V for fixed mode and the output OUT 5 FB Feedback I nput resistor divider for adjustable mode 6 NC No Connec t Not Connec ted 7 NC No Connec t Not Connec ted 8 PG Power G ood O utput Open- drain output Above 2.2V the device is enabled. GND the pin to put device in 9 EN Enable I nput standby mode. I ncludes inter nal pull-up B ootstrap capacitor for the high-side FE T gate dr iver. 22nF ceramic 10 BST B ootstrap Capacitor capacitor from BST pin to VSW pin 11 VCC I nput Voltage I nput Voltage 12 VSW Switching Voltage Node Connec ted to 4.7uH (t ypical) induc tor 13 VSW Switching Voltage Node Connec ted to 4.7uH (t ypical) induc tor 14 PGND Power GND GND supply for inter nal low-side FE T/integrated diode 15 PGND Power GND GND supply for inter nal low-side FE T/integrated diode 16 VSW Switching Voltage Node Connec ted to 4.7uH (t ypical) induc tor TS51221 2 of 18 www.semtech.com Final Datasheet Rev 1.1 April 6, 2015 Semtech