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7440650022 データシート(PDF) 11 Page - Texas Instruments

部品番号 7440650022
部品情報  3.5 V to 36 V Wide-VIN Synchronous 2.1 MHz Step-Down Converters
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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7440650022 データシート(HTML) 11 Page - Texas Instruments

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VOUT
RESET
High = Power Good
Low = Fault
94%
93%
107%
106%
11
LM53602, LM53603
www.ti.com
SNVSAR0 – NOVEMBER 2016
Product Folder Links: LM53602 LM53603
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 RESET Flag Output
The RESET function, built-in to the LM53603, has special features not found in the ordinary Power Good
function. A glitch filter prevents false flag operation for short excursions in the output voltage, such as during line
and load transients. Furthermore, there is a delay between the point at which the output voltage is within
specified limits and the flag asserts Power Good. Because the RESET comparator and the regulation loop share
the same reference, the thresholds track with the output voltage. This allows the LM53603 to be specified with a
96.5% maximum threshold, while at the same time specifying a 95% threshold with respect to the actual output
voltage for that device. This allows tighter tolerance than is possible with an external supervisor device. The net
result is a more accurate power-good function while expanding the system allowance for transients, and so forth.
RESET operation can best be understood by reference to Figure 7 and Figure 8. The values for the various filter
and delay times can be found in the Timing Requirements table. Output voltage excursions lasting less than
TRESET-filter, do not trip RESET. Once the output voltage is within the prescribed limits, a delay of TRESET-act is
imposed before RESET goes high.
This output consists of an open-drain NMOS; requiring an external pullup resistor to a suitable logic supply. It
can also be pulled up to either VCC or VOUT, through an appropriate resistor, as desired. If this function is not
needed, the pin should be left floating or grounded. When EN is pulled low, the flag output is also forced low.
With EN low, RESET remains valid as long as the input voltage is
≥ 1.5 V. The maximum current into this pin
should be limited to 1 mA, while the maximum voltage should be less than 8 V.
Figure 7. Static RESET Operation


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