參數(shù)資料
型號： TC1173
廠商： Microchip Technology Inc.
英文描述： 300mA CMOS LDO with Shutdown ERROR output and Bypass
中文描述： 300mA的CMOS LDO穩(wěn)壓器，帶有關(guān)斷錯誤輸出和旁路
文件頁數(shù)： 3/7頁
文件大小： 54K
代理商： TC1173
3
300mA CMOS LDO With Shutdown,
ERROR Output, And Bypass
TC1173
TC1173-2 2/2/00
SHDN may be controlled by a CMOS logic gate, or I/O port
of a microcontroller. If the SHDN input is not required, it
should be connected directly to the input supply. While in
shutdown, supply current decreases to 0.05
μ
A (typical),
V
OUT
falls to zero and ERROR is disabled.
ERROR Output
ERROR is driven low whenever V
OUT
falls out of regu-
lation by more than – 5% (typical). This condition may be
caused by low input voltage, output current limiting, or
thermal limiting.
The ERROR threshold is 5% below rated V
OUT
regard-
less of the programmed output voltage value (e.g., ERROR
= V
OL
at 4.75V (typ) for a 5.0V regulator and 2.85V (typ) for
a 3.0V regulator). ERROR output operation is shown in
Figure 2. Note that ERROR is active when V
OUT
is at or
below V
TH
, and inactive when V
OUT
is above V
TH
+ V
H
.
As shown in Figure 1, ERROR can be used as a battery
low flag, or as a processor RESET signal (with the addition
of timing capacitor C2). R1 x C3 should be chosen to
maintain ERROR below V
IH
of the processor RESET input
for at least 200msec to allow time for the system to stabilize.
Pull-up resistor R1 can be tied to V
OUT
, V
IN
or any other
voltage less than (V
IN
+ 0.3V.)
Output Capacitor
A 1
μ
F (min) capacitor from V
OUT
to ground is recom-
mended. The output capacitor should have an effective
series resistance of 5
or less. A 1
μ
F capacitor should be
connected from V
IN
to GND if there is more than 10 inches
of wire between the regulator and the AC filter capacitor, or
if a battery is used as the power source. Aluminum electro-
lytic or tantalum capacitor types can be used. (Since many
aluminum electrolytic capacitors freeze at approximately –
30
°
C, solid tantalums are recommended for applications
operating below – 25
°
C.) When operating from sources
other than batteries, supply-noise rejection and transient
response can be improved by increasing the value of the
input and output capacitors and employing passive filtering
techniques.
DETAILED DESCRIPTION
The TC1173 is a fixed output, low drop-out regulator.
Unlike bipolar regulators, the TC1173 supply current does not
increase with load current. In addition, V
OUT
remains stable and
within regulation at very low load currents (an important consid-
eration in RTC and CMOS RAM battery back-up applications).
TC1173 pin functions are detailed below:
PIN DESCRIPTIONS
Pin
No.
Symbol
Description
1
2
3
4
V
OUT
GND
NC
Bypass
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 Out-
put). 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 0.05
μ
A (typical).
No connect
Unregulated supply input
5
ERROR
6
SHDN
7
8
NC
V
IN
Figure 1 shows a typical application circuit. The regula-
tor is enabled any time the shutdown input (SHDN) is above
V
IH
, and shutdown (disabled) when SHDN is at or below V
IL
.
Figure 1: Typical Application Circuit
Figure 2: ERROR Output Operation
V
OUT
V
TH
V
IH
Hysteresis (V
H
)
V
OL
ERROR
TC1173
1
2
3
4
5
6
7
8
V
OUT
V
OUT
Shutdown Control
(from Power Control Logic)
C1
1
μ
F
GND
NC
V
IN
NC
SHDN
Bypass
C
470pF
(Optional)
ERROR
R3
1M
V
IN
ERROR
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC1173_13 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:300mA CMOS LDO with Shutdown ERROR Output and Bypass
TC1173-2.5VOA 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TC1173-2.5VOATR 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TC1173-2.5VUA 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TC1173-2.5VUATR 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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