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TPS3839G33DBZR Fiches technique(PDF) 6 Page - Texas Instruments |
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TPS3839G33DBZR Fiches technique(HTML) 6 Page - Texas Instruments |
6 / 11 page 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 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Link(s): TPS3839 |
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