參數(shù)資料
型號： TC1303B-CK3EMFTR
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
文件頁數(shù)： 17/30頁
文件大小： 441K
代理商： TC1303B-CK3EMFTR
2005 Microchip Technology Inc.
DS21949A-page 17
TC1303B
4.4
Power-Good
A power-good (PG) output signal is generated based
off of the LDO output voltage (V
OUT2
). A fixed delay
time of approximately 300 ms is generated once the
LDO output voltage is above the power-good threshold
(typically 94% of V
OUT2
). As V
OUT2
falls out of regula-
tion, the falling PG threshold is typically 92% of V
OUT2
.
The PG output signal is pulled up to V
OUT2
indicating
that power is good and pulled low indicating that V
OUT2
is out of regulation. The typical quiescent current draw
for power-good circuitry is less than 10 μA.
If the LDO 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
and avoiding false triggering of the PG signal during
line and load transients.
FIGURE 4-1:
Power-Good Timing.
4.5
Soft Start
Both outputs of the TC1303B are controlled during
startup. Less than 1% of V
OUT1
or V
OUT2
overshoot is
observed during startup from V
IN
rising above the
UVLO voltage or SHDN1 or SHDN2 being enabled.
4.6
Overtemperature Protection
The TC1303B has an integrated overtemperature
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.
t
RPU
t
RPD
V
TH_H
V
OUT2
PG
V
OL
V
OH
相關PDF資料
PDF描述
TC1303B-CK3EUN 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303B-CK3EUNTR 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
TC1303B-CL0EMF 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
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TC1303B-CL0EUN 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output
相關代理商/技術參數(shù)
參數(shù)描述
TC1303B-CK3EUN 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
TC1303B-CK3EUNTR 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
TC1303B-CL0EMF 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
TC1303B-CL0EMFTR 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
TC1303B-CL0EUN 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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