UG175: TS331x EVB User s Guide The TS331x is a low power boost converter with an industry leading low quiescent cur- KEY FEATURES rent of 150 nA, enabling ultra long battery life in systems running from a variety of bat- tery sources. The TS331x steps up input voltages from 0.9 V to 5.0 V to eight selectable Input Voltage Range: 0.9 V5.0 V output voltages ranging from 1.8 V to 5.0 V. The TS331x includes two output options, Jumper selectable VOUT: one being an always-on storage output while the additional output is an output load 1.8 V, 2.1 V, 2.5 V, 2.85 V, 3 V, 3.3 V, switch that is designed to burst-on loads in a low duty cycle manner. 4.1 V, 5 V (TS3310/12) The TS331x output voltage can be set via jumpers S0, S1, and S2. Both the STORE 4 V, 4.2 V, 4.35 V, 4.5 V, 4.6 V, 4.7 V, and OUT output can be monitored along with the power good output VGOOD. Jumper 4.8 V, 4.9 V (TS3314) OUT ON is available to disable or enable the OUT output. OUT Enable/Disable Jumper 10 H Inductor, 900 mA I SAT Taiyo Yuden: CBC3225T100KR ORDERING INFORMATION TS3310DB TS3312DB (1.9 V UVLO) TS3314DB (4.xV outputs) silabs.com Smart. Connected. Energy-friendly. Rev. 1.0 UG175: TS331x EVB User s Guide Description 1. Description The maximum available output current for the TS331x is a function of the inductor value and the average input current. The average input current will vary according to the load. When the output current is at its maximum, the averaged input current is also at a maxi- mum. The maximum averaged input current is defined by the following equation. I 1s V pk IN I = = IN ( AVG,MAX ) 2 L Equation 1. Maximum Average Input Current Calculation The expected maximum STORE output current is defined by the following equation. V IN I = I Efficiency STORE(MAX ) IN ( AVG,MAX ) V O UT Equation 2. Expected Maximum STORE Output Current Calculation The table below lists some example inductor values and the corresponding expected maximum output load current available for the TS331x, assuming an 85% efficiency, an input voltage of 2 V, and an output voltage of 3 V (4.35 V for TS3314). Table 1.1. Expected Maximum Output Current L TS3310 and TS3312 TS3314 I I STORE(MAX) STORE(MAX) 10 H 56.67 mA 38.63 mA 22 H 25.75 mA 17.56 mA 33 H 17.17 mA 11.71 mA 100 H 5.67 mA 3.86 mA The TS3310 and TS3312 demo board is configured for 3 V output by default. The TS3314 demo board is configured for a 4.35 V output by default. The TS331x demo board provides test points to monitor the output voltage STORE and OUT. The power good pin, VGOOD, is pulled to the STORE output by a 3.3 M pull-up resistor R1 and can be monitored via test point PG. To enable or disable the OUT output voltage, a jumper for the OUT ON pin is available. The STORE and OUT output voltage can be set via jumpers S2, S1, and S0. silabs.com Smart. Connected. Energy-friendly. Rev. 1.0 1