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TC1268-2.5VOA Folha de dados(PDF) 4 Page - Microchip Technology

Nome de Peças TC1268-2.5VOA
Descrição Electrónicos  500mA Fixed Output, Fast Response CMOS LDO with Shutdown
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1268-2.5VOA Folha de dados(HTML) 4 Page - Microchip Technology

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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, VOUT
remains stable and within regulation over the entire
0mA to ILOAD
MAX
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 (TWK) and Settling
Time (TS).
The TC1268 has a fast Wake-up Time (5
µsec typical)
when released from shutdown. See Figure 3-2 for the
Wake-up Time designated as TWK.The Wake-up Time
is defined as the time it takes for the output to rise to 2%
of the VOUT value after being released from shutdown.
The total turn on response is defined as the Settling
Time (TS), seeFigure 3-2. Settling Time(inclusivewith
TWK) is defined as the condition when the output is
within 2% of its fully enabled value (15
µsec typical)
when released from shutdown. The settling time of the
output voltage is dependent on load conditions and
output capacitance on VOUT (RC response).
The Wake-up Time (TWK) 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-uptimeof 5
µsec 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
1VOUT
Regulated voltage output.
2
GND
Ground terminal.
3
NC
No connect.
4
BYPASS
Reference bypass input. Connecting a 470pF to this input further reduces output noise.
5
ERROR
Out-of-Regulation Flag. (Open drain output). This output goes low when VOUT is out-of-tolerance
by approximately -5%.
6
SHDN
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
µA(typical).
7
NC
No connect.
8VIN
Unregulated supply input.
CIN
1
µF
Battery
TC1268
VIN
VOUT
V+
C1
COUT
1
µF
CBYP
10nF
GND
BYP
SHDN
OFF
ON
C1 required only if ERROR is used
as a processor RESET signal (See Text)
VOUT
0.2
µF
R1
1M
SHDN
ERROR
+
+
+
+
VIH
TS
TWK
VOUT
98%
2%
VIL
SHDN


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