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TPS60125PWPG4 Datasheet(PDF) 6 Page - Texas Instruments |
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TPS60125PWPG4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 27 page TPS60120, TPS60121, TPS60122, TPS60123, TPS60124, TPS60125 REGULATED 200-mA HIGH EFFICIENCY CHARGE PUMP DC/DC CONVERTERS SLVS257B – NOVEMBER 1999 – REVISED AUGUST 2000 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 low-battery detector (TPS60120, TPS60122, TPS60124) The internal low-battery comparator trips at 1.21 V ±5% when the voltage on LBI ramps down. The battery voltage at which the comparator initiates a low battery warning at the LBO output can easily be programmed with a resistive divider as shown in Figure 1. The sum of resistors R1 and R2 is recommended to be in the 100-k Ω to 1-M Ω range. LBO is an open drain output. An external pullup resistor to OUT, 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 disabled. If the low-battery comparator function is not used, connect LBI to ground and leave LBO unconnected. V (TRIP) + 1.21 V 1 ) R1 R2 _ + + – VREF VBAT IN R1 LBI R2 LBO R3 VO Figure 1. Programming of the Low-Battery Comparator Trip Voltage Formulas to calculate the resistive divider for low battery detection, with VLBI = 1.15 V – 1.27 V: R2 + 1MW V LBI V Bat R1 + 1MW * R2 Formulas to calculate the minimum and maximum battery voltage that triggers the low battery detector: V Bat(min) + V LBI(min) R1 (min) ) R2 (max) R2 (max) V Bat(max) + V LBI(max) R1 (max) ) R2 (min) R2 (min) Table 1. Recommended Values for the Resistive Divider From the E96 Series ( ±1%), VLBI = 1.15 V – 1.27 V VBAT/V R1/k Ω R2/k Ω VBAT (MIN)/V VBAT(MAX)/V 1.8 357 732 1.700 –5.66% 1.902 5.67% 1.9 365 634 1.799 –5.32% 2.016 6.11% 2.0 412 634 1.883 –5.86% 2.112 5.6% 2.1 432 590 1.975 –5.95% 2.219 5.67% 2.2 442 536 2.080 –5.45% 2.338 6.27% Using ±1% accurate resistors, the total accuracy of the trip voltage is about ±6%, considering the ±4% accuracy the integrated voltage reference adds and considering that not every calculated resistor value is available. |
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