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TPS60101 Fiches technique(PDF) 6 Page - Texas Instruments

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No de pièce TPS60101
Description  REGULATED 5-V,300 MA HIGH EFFICIENCY CHARGE PUMP DC/DC CONVERTERS
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS60101 Fiches technique(HTML) 6 Page - Texas Instruments

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TPS60130, TPS60131, TPS60132, TPS60133
REGULATED 5V, 300 mA HIGH EFFICIENCY CHARGE PUMP
DC/DC CONVERTERS
SLVS258A − NOVEMBER 1999 − REVISED DECEMBER 1999
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
low-battery detector (TPS60130 and TPS60132) (continued)
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.
_
+
+
VREF
VBAT
IN
R1
LBI
R2
LBO
V
TRIP +
1.21 V
1
) R1
R2
VOUT
R3
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/kΩ
R2/kΩ
VBAT(MIN)/V
VBAT(MAX)/V
2.7
562
453
2.548
−5.61%
2.877
6.57%
2.8
576
442
2.619
−6.47%
2.958
5.66%
2.9
590
422
2.726
−6.00%
3.081
6.26%
3.0
590
402
2.804
−6.53%
3.172
5.72%
3.1
604
383
2.928
−5.56%
3.313
6.88%
3.2
619
374
3.016
−5.76%
3.414
6.70%
3.3
649
374
3.106
−5.88%
3.518
6.62%
A 100 nF bypass 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.


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