參數(shù)資料
型號： TPS60120PWPG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20
封裝： GREEN, PLASTIC, HTSSOP-20
文件頁數(shù)： 27/30頁
文件大?。?/td> 878K
代理商： TPS60120PWPG4
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
to 1-M
range.
LBO is an open drain output. An external pullup resistor to OUT, in the 100-k
to 1-M range, is recommended.
During start-up, the LBO output signal is invalid for the first 500
s. 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
R2/k
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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