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參數(shù)資料
| 型號： | TPS3110E12MDBVREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO6 |
| 封裝： | PLASTIC, SOT-23, 6 PIN |
| 文件頁數(shù)： | 6/22頁 |
| 文件大小： | 502K |
| 代理商： | TPS3110E12MDBVREP |
www.ti.com
APPLICATION INFORMATION
R1 + R2
V
TRIP
V
IT(S)
* 1
(1)
TPS3106E09DBV
SENSE
GND
R1
R2
V
DD
RSTVDD
RSTSENSE
R3
2Cell
NiMH
ResetOutput
MR
Production Data
TPS3106xxx-EP
TPS3110xxx-EP
SLVS686 – OCTOBER 2006
The TPS31xx family has a quiescent current in the 1-
A to 2-A range. When RESET is active, triggered by the
voltage monitored at VDD, the quiescent current increases to about 20 A (see the Electrical Characteristics).
In some applications, it is necessary to minimize the quiescent current even during the reset period. This is
especially true when the voltage of a battery is supervised and the RESET is used to shut down the system or
for an early warning. In this case, the reset condition lasts for a longer period of time. The current drawn from
the battery should almost be zero, especially when the battery is discharged.
For this kind of application, either the TPS3103 or TPS3106 is a good fit. To minimize current consumption,
select a version where the threshold voltage is lower than the voltage monitored at VDD. The TPS3106 has two
reset outputs. One output (RSTVDD) is triggered from the voltage monitored at VDD. The other output
(RSTSENSE) is triggered from the voltage monitored at SENSE. In the application shown in Figure 11, the
TPS3106E09 is used to monitor the input voltage of two NiCd or NiMH cells. The threshold voltage
(V(TH) = 0.86 V) was chosen as low as possible to ensure that the supply voltage is always higher than the
threshold voltage at VDD. The voltage of the battery is monitored using the SENSE input. The voltage divider
was calculated to assert a reset using the RSTSENSE output at 2
× 0.8 V = 1.6 V.
where:
VTRIP is the voltage of the battery at which a reset is asserted and
VIT(S) is the threshold voltage at SENSE = 0.551 V.
R1 was chosen for a resistor current in the 1-
A range.
With VTRIP = 1.6 V:
R1
≈ 1.9 × R2
R1 = 820 k
, R2 = 430 k
Figure 11. Battery Monitoring with 3-
A Supply Current for Device and Resistor Divider
14
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