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TPS60213DGSRG4 데이터시트(PDF) 6 Page - Texas Instruments |
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TPS60213DGSRG4 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 26 page TPS60210, TPS60211, TPS60212, TPS60213 REGULATED 3.3 V, LOW RIPPLE CHARGE PUMP WITH ULTRALOW OPERATING CURRENT SLVS296 − JUNE 2000 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) low-battery detector (TPS60210 and TPS60212) The low-battery comparator trips at 1.18 V ±5% when the voltage on pin LBI ramps down. The voltage V(TRIP) at which the low-battery warning is issued can be adjusted with a resistive divider as shown in Figure 2. The sum of resistors R1 and R2 is recommended to be in the 100-k Ω to 1-MΩ range. LBO is an open drain output. An external pullup resistor to OUT, or any other voltage rail in the appropriate range, in the 100-k Ω to 1-MΩ range is recommended. During start-up, the LBO output signal is invalid for the first 500 µs. LBO is high impedance when the device is programmed into snooze mode. If the low battery function is not used, connect LBI to ground and leave LBO unconnected. When the device is programmed into snooze mode (SNOOZE = LOW), the low-battery detector is disabled. V ( TRIP) + 1.18 V 1 ) R1 R2 _ + + − VREF VBAT IN R1 LBI R2 LBO R3 VO Figure 2. Programming of the Low-Battery Comparator Trip Voltage A 100-nF ceramic capacitor should be connected in parallel to R2 if large line transients are expected. These voltage drops may inadvertently trigger the low-battery comparator and produce a wrong low-battery warning signal at the LBO pin. Formulas to calculate the resistive divider for low-battery detection, with VLBI = 1.13 V to 1.23 V and the sum of resistors R1 and R2 equal 1 M Ω: R2 + 1MW V LBI V Bat R1 + 1MW * R2 (1) (2) Formulas to calculate the minimum and maximum battery voltage: V Bat(min) + V LBI(min) R1 (min) ) R2 (max) R2 (max) V Bat(max) + V LBI(max) R1 (max) ) R2 (min) R2 (min) (3) (4) |
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