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TC1303A Datasheet(PDF) 21 Page - Microchip Technology

Part No. TC1303A
Description  500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1303A Datasheet(HTML) 21 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
DS21949B-page 21
TC1303A/TC1303B/TC1303C/TC1304
4.4
Power-Good
A Power-Good (PG) output signal is generated based
off of the buck regulator output voltage (VOUT1), the
LDO output voltage (VOUT2) or the combination of both
outputs. A fixed delay time of approximately 262 ms is
generated once the monitored output voltage is above
the power-good threshold (typically 94% of VOUTX). As
the monitored output voltage falls out of regulation, the
falling PG threshold is typically 92% of the output
voltage. The PG output signal is pulled up to the output
voltage, indicating that power is good and pulled low,
indicating that the output is out of regulation. The typi-
cal quiescent current draw for power-good circuitry is
less than 10 µA.
If the monitored output voltage falls below the power-
good threshold, the power-good output will transition to
the Low state. The power-good circuitry has a 165 µs
delay when detecting a falling output voltage. This
helps to increase the noise immunity of the power-good
output, avoiding false triggering of the PG signal during
line and load transients.
FIGURE 4-1:
Power-Good Timing.
4.5
Power Good Output Options
There are three monitoring options for the TC1303
family.
For the TC1303A, only the buck regulator output
voltage (VOUT1) is monitored. The PG output signal
depends only on VOUT1.
For the TC1303B, only the LDO output voltage (VOUT2)
is monitored. The PG output signal depends only on
VOUT2.
For the TC1303C and TC1304, both the buck regulator
output voltage and LDO output voltage are monitored.
If either one of the outputs fall out of regulation, the PG
will be low. Only if both VOUT1 and VOUT2 are within the
PG voltage threshold limits will the PG output be high.
For the TC1303A,C and TC1304, the PG output pin is
open drain and can be pulled up to any level within the
given absolute maximum ratings (AGND - 0.3V) to (VIN
+ 0.3V).
TABLE 4-1:
PG AVAILABLE OPTIONS
tRPU
tRPD
VTH_H
VOUT1
PG
VOL
VOH
or VOUT2
Part
Number
PG Output
Buck
(VOUT1)
PG
Output
LDO
(VOUT2)
PG Output
Type
TC1303A
Yes
No
Open-Drain
TC1303B
No
Yes
Push-Pull
(VOUT2)
TC1303C
Yes
Yes
Open-Drain
TC1304
Yes
Yes
Open-Drain


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