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参数资料
| 型号： | TC1303B-CR3EMF |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| 中文描述： | 500毫安同步降压稳压器，300 mA的LDO具有电源就绪输出 |
| 文件页数： | 17/30页 |
| 文件大小： | 441K |
| 代理商： | TC1303B-CR3EMF |
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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
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| TC1303B-CS0EMF | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1303B-CR3EMFTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-CR3EUN | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-CR3EUNTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-CS0EMF | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-CS0EMFTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
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