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EnerChip™ CC Backup Power for Micro Crystal RV-2123 RTC

Introduction

Cymbet EnerChips are solid state rechargeable batteries having distinguishing characteristics compared to conventional rechargeable batteries. EnerChips have a high charge/discharge cycle life; low self-discharge; simple voltage controlled charging; flat discharge voltage profile; have no flammable solvents to leak or catch fire; are solder reflow tolerant; and are offered in low profile surface mount packages.

Many applications demand ultra low power consumption from the various system components, particularly when system power is derived from primary or rechargeable batteries. Moreover, in systems utilizing RTCs it is essential that when main power is interrupted, the standby power of the RTC be exceedingly low in order to achieve maximum run time from the backup power source. A commonly used RTC is the Micro Crystal RV-2123. Because the device has very low operating current in backup mode - typically 130nA at 3V - a miniature EnerChip device with integrated power management can provide up to several days of backup power to the RTC when main power is interrupted. This Application Note describes use of the EnerChip CC - solid state energy storage integrated with battery management in a single package - as a backup power source for the RV-2123 RTC.

A typical application circuit is shown in Figure 1. Main power is fed to the CBC31xx, which in turn powers the RV-2123. When the supply voltage drops below a specific threshold as detected by the CBC31xx, the EnerChip solid state battery embedded in the EnerChip CC delivers power to the RTC through the CBC31xx VOUT pin.

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