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TPS3610T50 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS3610T50 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 27 page  TPS3610U18, TPS3610T50 BATTERY BACKUP SUPERVISORS FOR RAM RETENTION SLVS327B – DECEMBER 2000 – REVISED DECEMBER 2002 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) backup-battery switchover In case of a brownout or power failure, it may be necessary to preserve the contents of RAM. If a backup-battery is installed at VBAT, the device automatically switches the connected RAM to backup power when VDD fails. In order to allow the backup-battery (e.g., a 3.6-V lithium cell) to have a higher voltage than VDD, these supervisors do not connect VBAT to VOUT when VBAT is greater than VDD. VBAT only connects to VOUT (through a 15-Ω switch) when VDD falls below VIT and VBAT is greater than VDD. When VDD recovers, switchover is deferred either until VDD crosses VBAT, or until VDD rises above the reset threshold VIT. VOUT connects to VDD through a 1-Ω (max) PMOS switch when VDD crosses the reset threshold. FUNCTION TABLE VDD > VBAT VDD > VIT VOUT 1 1 VDD 1 0 VDD 0 1 VDD 0 0 VBAT Undefined VBSW Hysteresis VBAT Mode VDD Mode VIT Hysteresis VBAT – Backup-Battery Supply Voltage – V Figure 4. Normal Supply Voltage vs Backup-Battery Supply Voltage |
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