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TPS60204DGSG4 Fiches technique(PDF) 6 Page - Texas Instruments |
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TPS60204DGSG4 Fiches technique(HTML) 6 Page - Texas Instruments |
6 / 21 page TPS60204, TPS60205 REGULATED 3.3V, 100mA LOW RIPPLE CHARGE PUMP LOW POWER DC/DC CONVERTERS SLVS354A − FEBRUARY 2001 − REVISED SEPTEMBER 2001 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) low-battery detector (TPS60204) The low-battery comparator trips at 1.18 V ±4% 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. When choosing R1 and R2, be aware of the input leakage current into the LBI pin. 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 disabled. If the low-battery comparator function is not used, connect LBI to ground and leave LBO unconnected. The low-battery detector is disabled when the device is switched off. 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 can 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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