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TC2054 Datasheet(PDF) 3 Page - Microchip Technology

Part # TC2054
Description  50mA, 100mA, and 150mA CMOS LDOs with Shutdown and Error Output
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21663B-page 3
TC2054/2055/2186
2.0
PIN DESCRIPTIONS
Thedescriptionsof the pins arelistedinTable2-1.
TABLE 2-1:
PIN FUNCTION TABLE
SHDN Input
VIH
SHDN Input High Threshold
60
——
%VIN
VIN = 2.5V to 6.0V
VIL
SHDN Input Low Threshold
15
%VIN
VIN = 2.5V to 6.0V
ERROR OUTPUT
VINMIN
Minimum VIN Operating Volt-
age
1.0
V
VOUT ≥ 2.7V
VOL
Output Logic Low Voltage
400
mV
1 mA Flows to ERROR
VTH
ERROR Threshold Voltage
0.95 x VR
V
SeeFigure4-2
VHYS
ERROR Positive Hysteresis
50
mV
Note 8
tDELAY
VOUT to ERROR Delay
2
msec
VOUT from VR =3V to2.8V
RERROR
Resistance from ERROR to
GND
126
VDD =2.5V, VOUT =2.5V
Note
1:
The minimum VIN has to meet two conditions: VIN =2.7V and VIN =VR +VDROPOUT.
2:
VR is the regulator output voltage setting. For example: VR = 1.8V, 2.7V, 2.8V, 2.85V, 3.0V, 3.3V.
3:
TCVOUT =
4:
Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a
load range from 1.0mA to the maximum specified output current. Changes in output voltage due to heating effects are covered
by the thermal regulation specification.
5:
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value at a 1V
differential.
6:
Thermal Regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, exclud-
ing load or line regulation effects. Specifications are for a current pulse equal to IMAX at VIN = 6V for T = 10msec.
7:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature
and the thermal resistance from junction-to-air (i.e. TA,TJ, θJA).
8:
Hysteresis voltage is referenced by VR.
9:
Time required for VOUT to reach 95% of VR (output voltage setting), after VSHDN is switched from 0 to VIN.
Electrical Characteristics: VIN =VR +1V, IL =100µA, CL =3.3µF, SHDN >VIH,TA = 25°C, unless otherwise noted. BOLDFACE
type specifications apply for junction temperature of -40°C to +125°C.
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
V
OU TMAX
V
OUTM IN
() 10
6
×
V
OUT
∆T
×
-----------------------------------------------------------------------------------------
Pin Number
Symbol
Description
1VIN
Unregulated supply input.
2
GND
Ground terminal.
3
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, ERROR
is open circuited and supply current is reduced to 0.5µA (max).
4
ERROR
Out-of-Regulation Flag. (Open drain output). This output goes low when
VOUT is out-of-tolerance by approximately -5%.
5VOUT
Regulated voltage output.


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