SLVU030

The Texas Instruments TPS60210 charge pump is a regulated voltage doubler. The TPS60210 delivers 3.3-V output voltage (VO) from a 1.8-V to 3.6-V input voltage (VI). The output current (IO) is 100 mA minimum, for an input voltage (VI) of 2.0 V or higher.

For output currents below 2 mA, the device TPS60210 can be operated in the snooze mode (SNOOZE = 0). This is an operating mode, where the quiescent current is drastically reduced. In this mode, VO is regulated to 3.3 V ±6%. The low quiescent current is achieved by disabling most of the internal circuitry as long as VO is high enough. When VO decreases, the device operates for a short period of time in normal mode, to boost VO. The internal circuitry is then disabled again. This reduces the quiescent current to a typical value of only 2 mA. If the device is programmed to operate in snooze mode and the IO increases above 2 mA, the device enters the startup mode to increase VO.  Additionally, the TPS60210 has a low battery detector (LBI input and LBO output). The trip voltage of the LBI input is typically 1.18 V. The TPS60210 can be programmed with an external resistive divider to the specific trip voltage for the application. On the EVM, the resistive divider on the LBI input is connected to VI and the trip voltage is set to 2.0 V, typically. The LBO output is an open-drain output and is in a high-impedance state as long as the voltage at LBI is above the trip voltage. A 1-MW pullup resistor to VO is added on the EVM to get a defined high signal as long as the voltage at LBI is above the trip voltage.

For simple evaluation, a 1-MW resistor between VI and theTPS60210  SNOOZE pin is added to operate the TPS60210 in normal mode.

A minimum of four external capacitors TPS60210 for a push-pull voltage doubler charge pump are required. The EVM is built with these four capacitors. For evaluation, it is possible to use other capacitor values like those given in the application section of the TPS6021x data sheet (literature number SLVS296). The capacitors on the EVM are ceramic capacitors. The ESR of all other capacitor types is too high to get good performance.