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TC1303A Datasheet(PDF) 22 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) 22 Page - Microchip Technology

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TC1303A/TC1303B/TC1303C/TC1304
DS21949B-page 22
© 2005 Microchip Technology Inc.
4.6
TC1304 Sequencing
The TC1304 device features an integrated sequencing
option. A sequencing circuit using only the SHDN input,
(Pin1), will turn on the LDO output (VOUT2) and delay
the turn on of the Buck Regulator output (VOUT1) until
the LDO output is in regulation. During power-down,
the sequencing circuit will turn off the Buck Regulator
output prior to turning off LDO output.
FIGURE 4-2:
TC1304 Sequencing Circuit.
FIGURE 4-3:
TC1304 Power-up Timing
from SHDN.
4.7
Soft Start
Both outputs of the TC1303/TC1304 are controlled
during start-up. Less than 1% of VOUT1 or VOUT2 over-
shoot is observed during start-up from VIN rising above
the UVLO voltage or either SHDN1 or SHDN2 being
enabled.
4.8
Overtemperature Protection
The TC1303/TC1304 has an integrated overtempera-
ture protection circuit that monitors the device junction
temperature and shuts the device off if the junction tem-
perature exceeds the typical 165°C threshold. If the
overtemperature threshold is reached, the soft start is
reset so that, once the junction temperature cools to
approximately 155°C, the device will automatically
restart.
Enable
Enable
VOUT2
VOUT1
+
+
160 µs Delay*
160 µs Delay*
92% of VOUT2
92% of VOUT1
To PG
Delay CKT.
SHDN
* 160 µs delay on trailing edge
VIN1/VIN2
VOUT1
VOUT2
Power Good
Power Up Timing From SHDN
300ms
tWK + tS
500 µs
TC1304
SHDN


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