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TPS3839G33DBZR Fiches technique(PDF) 6 Page - Texas Instruments

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No de pièce TPS3839G33DBZR
Description  Ultra-Low Power, Supply Voltage Supervisor
Download  11 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS3839G33DBZR Fiches technique(HTML) 6 Page - Texas Instruments

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4.7 PH
10 PF
10 PF
5 k:
L
VIN
VOUT
RI
GND
FB
EN
TPS61261
One Cell
Alkaline
VDD
GND
RESET
TPS3839A09
3.3 V at 40 mA
RESET
GND
TPS3839K33
VDD
RST
PP
3.3 V
VCC
47 k:
TPS3839
SBVS193 – JUNE 2012
www.ti.com
INPUT CAPACITOR
The TPS3839 uses a unique sampling scheme to maintain an extremely low average quiescent current of 150
nA. The TPS3839 typically only consumes approximately 100 nA of dc current. However, this current rises to
approximately 15 µA for about 200 µs while the TPS3839 samples the input voltage. If the source impedance is
high then the additional current during sampling may trigger a false reset because of the apparent voltage drop
at VDD. For high VDD source or trace impedance applications, it is recommended to add a small 0.1-µF bypass
capacitor near the TPS3839 VDD pin. The bypass capacitor effectively keeps the average current at 150 nA and
reduces the effects of a high-impedance voltage source.
BIDIRECTIONAL RESET PINS
Some microcontrollers have bidirectional RESET pins that act both as an input and an output. A series resistor
should be placed between the TPS3839 output and the microcontroller RESET pin to protect against excessive
current flow when both the TPS3839 and the microcontroller attempt to drive the RESET line. Figure 5 shows the
connection of the TPS3839 with a microcontroller using a series resistor to drive a bidirectional RESET line.
Figure 5. Connection to Bidirectional RESET Pin
SINGLE ALKALINE CELL MONITORING
The low operating voltage and threshold options make the TPS3839 well-suited for monitoring single-cell alkaline
battery applications. Figure 6 shows the TPS3839A09 used to disable a boost converter when the cell voltage
reaches 0.9 V, which is the end of the discharge voltage for a single alkaline battery cell. When the cell voltage
reaches 0.9 V, the TPS61261 enable pin is driven low. This setting disables the TPS61261 and places it in a
low-current shutdown state. The combination of the TPS3839 and TPS61261 only consumes 250 nA (typical)
from the discharged battery.
Figure 6. Disabled Boost Converter
6
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Link(s): TPS3839


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