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參數(shù)資料
| 型號： | TC1268 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500mA Fixed Output, Fast Response CMOS LDO with Shutdown |
| 中文描述： | 500mA的固定輸出，快速響應(yīng)的CMOS LDO穩(wěn)壓器，帶有關(guān)斷 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 448K |
| 代理商： | TC1268 |
TC1268
DS21379B-page 4
2002 Microchip Technology Inc.
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
3.0
DETAILED DESCRIPTION
The TC1268 is a precision, fixed output LDO. Unlike
bipolar regulators, the TC1268 supply current does
not increase with load current. In addition, V
OUT
remains stable and within regulation over the entire
0mA to I
LOAD
load current range, (an important
consideration in RTC and CMOS RAM battery back-up
applications). Figure 3-1 shows a typical application
circuit.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
Turn On Response
The turn on response is defined as two separate
response categories, Wake-up Time (T
WK
) and Settling
Time (T
S
).
The TC1268 has a fast Wake-up Time (5
μ
sec typical)
when released from shutdown. See Figure 3-2 for the
Wake-up Time designated as T
WK
. The Wake-up Time
is defined as the time it takes for the output to rise to 2%
of the V
OUT
value after being released from shutdown.
The total turn on response is defined as the Settling
Time (T
S
), see Figure 3-2. Settling Time (inclusive with
T
WK
) is defined as the condition when the output is
within 2% of its fully enabled value (15
μ
sec typical)
when released from shutdown. The settling time of the
output voltage is dependent on load conditions and
output capacitance on V
OUT
(RC response).
The Wake-up Time (T
WK
) is an important parameter
to consider when using the TC1268 in RAMBUS
applications. In this application, the bus voltage is held
at 2.5V by a switching regulator during normal power
conditions and can be switched to low power mode,
where the TC1268 takes over and supplies the same
2.5V, but at a much lower current (300mA). In order to
not see the bus voltage drop during the transition from
high power to low power, the TC1268 has a very fast
wake-up time of 5
μ
sec to support the 2.5V rail. This
makes the TC1268 ideal for applications involving
RAMBUS.
FIGURE 3-2:
WAKE-UP RESPONSE
TIME
Pin No.
(8-Pin SOIC)
Symbol
Description
1
2
3
4
5
V
OUT
GND
NC
BYPASS
ERROR
Regulated voltage output.
Ground terminal.
No connect.
Reference bypass input. Connecting a 470pF to this input further reduces output noise.
Out-of-Regulation Flag. (Open drain output). This output goes low when V
OUT
is out-of-tolerance
by approximately -5%.
Shutdown control input. The regulator is fully enabled when a logic high is applied to this input.
The regulator enters shutdown when a logic low is applied to this input. During shutdown, output
voltage falls to zero and supply current is reduced to 5
μ
A (typical).
No connect.
Unregulated supply input.
6
SHDN
7
8
NC
V
IN
C
IN
1
μ
F
Battery
TC1268
V
IN
V
OUT
V
+
C1
C
OUT
1
μ
C
10nF
GND
BYP
SHDN
OFF
ON
C1 required only if ERROR is used
as a processor RESET signal (See Text)
V
OUT
0.2
μ
F
R1
1M
SHDN
ERROR
+
+
+
+
–
V
IH
T
S
T
WK
V
OUT
98%
2%
V
IL
SHDN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1268-2.5VOA | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500mA Fixed Output, Fast Response CMOS LDO with Shutdown |
| TC1268-2.5VOATR | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA Fixed Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1269 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269-2.5VUA | 功能描述:低壓差穩(wěn)壓器 - LDO 300mA LDO w/Shdn RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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