參數(shù)資料
型號(hào)： TC1303A-AR2EMFTR
廠商： Microchip Technology Inc.
英文描述： 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
中文描述： 500毫安同步降壓穩(wěn)壓器，300 mA的LDO具有電源就緒輸出
文件頁(yè)數(shù)： 21/36頁(yè)
文件大?。?/td> 463K
代理商： TC1303A-AR2EMFTR
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 (V
OUT1
), the
LDO output voltage (V
OUT2
) 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 V
OUTX
). 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 (V
OUT1
) is monitored. The PG output signal
depends only on V
OUT1
.
For the TC1303B, only the LDO output voltage (V
OUT2
)
is monitored. The PG output signal depends only on
V
OUT2
.
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 V
OUT1
and V
OUT2
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 (A
GND
- 0.3V) to (V
IN
+ 0.3V).
TABLE 4-1:
PG AVAILABLE OPTIONS
t
RPU
t
RPD
V
TH_H
V
OUT1
or V
OUT2
PG
V
OL
V
OH
Part
Number
PG Output
Buck
(V
OUT1
)
PG
Output
LDO
(V
OUT2
)
No
Yes
PG Output
Type
TC1303A
TC1303B
Yes
No
Open-Drain
Push-Pull
(V
OUT2
)
Open-Drain
Open-Drain
TC1303C
TC1304
Yes
Yes
Yes
Yes
相關(guān)PDF資料
PDF描述
TC1303A-AR2EUN 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303A-AR2EUNTR 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303A-AR3EMF 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303A-AR3EMFTR 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303A-AR3EUN 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC1303A-AR2EUN 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303A-AR2EUNTR 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303A-AR3EMF 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303A-AR3EMFTR 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303A-AR3EUN 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
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