Microchip Technology TC2186-2.5VCTTR, TC2186-1.8VCTTR, TC2186-3.3VCTTR, TC2186-3.0VCTTR, TC2186-2.8VCTTR Datasheet
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TC2054/2055/2186
50mA, 100mA, and 150mA CMOS LDOs
with Shutdown and Error Output
Features
• Very LowSupply Current (55µA Typ.) for Longer
Battery Life
• Very LowDropout Voltage: 140mV (Typ.) @
150mA
• High Output Voltage Accuracy: ±0.4% (Typ)
• Standard or Custom Output Voltages
• Power-Saving Shutdown Mode
• ERROR
Output Can Be Used as a Low Battery
Detector or Processor Reset Generator
• Fast Shutdown Reponse Time: 60µsec (Typ)
• Over-Current Protection
• Space-Saving 5-Pin SOT-23A Package
• Pin Compatible Upgrades forBipolar Regulators
Applications
• Battery Operated Systems
• PortableComputers
• Medical Instruments
• Instrumentation
• Cellular / GSMS / PHS Phones
• Pagers
General Description
The TC2054, TC2055 and TC2186 are high accuracy
(typically ±0.4%) CMOS upgrades for older (bipolar)
low dropout regulators. Designed specifically for battery-operatedsystems, thedevices’totalsupply current
is typically 55µA at full load (20 to 60 times lower than
in bipolar regulators).
The devices’ key features include ultra low noise operation, very low dropout voltage - typically 45mV
(TC2054); 90mV (TC2055); and 140mV (TC2186) at
full load - and fast response to step changes in load. An
erroroutput(ERROR
)isassertedwhenthedevicesar e
out-of-regulation (due to a low input voltage or excessiveoutputcurrent).Supplycurrent is reduced to 0.5µA
(max) and both V
and ERROR ar e disabled when
OUT
the shutdowninputislow.Thedevicesalsoincorporate
over-current protection.
The TC2054, TC2055 and TC2186 are stable with a
low esr ceramic output capacitor of 1µF and have a
maximum output current of50mA, 100mA and150mA,
respectively. This LDO Family also features a fast
response time (60µsec typically) when released from
shutdown.
Typical Application
Device Selection Table
Junction Temp.
Part Number Package
TC2054-xxVCT 5-Pin SOT-23A* -40°C to +125°C
TC2055-xxVCT 5-Pin SOT-23A* -40°C to +125°C
TC2186-xxVCT 5-Pin SOT-23A* -40°C to +125°C
Note: *5-Pin SOT-23A is equivalent to EIAJ (SC-74A).
Range
Package Type
V
OUT
ERROR
45
V
IN
Shutdown Control
(from Power Control Lo
1
V
IN
1µF
2
GND
TC2054
TC2055
TC2186
34
SHDN
ic)
TC2054
TC2055
TC2186
2
1
V
GND
IN
2002 Microchip TechnologyInc. DS21663B-page 1
3
SHDN
5-Pin SOT-23A*
TOP VIEW
V
OUT
ERROR
5
1µF
1M
V
OUT
ERROR
TC2054/2055/2186
1.0 ELECTRICAL
CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS*
Input Voltage .........................................................6.5V
Output Voltage................................(-0.3) to (V
Operating Temperature ..................-40°C < T
+0.3)
IN
<125°C
J
*Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress r atings only and functional
operation of the device attheseor any other conditions
above those indicated in the operation sections of the
specifications is not implied. Exposure to Absolute
Maximum Rating conditions for extended periods my
affect device reliability.
Storage Temperature..........................-65°C to +150°C
Maximum Voltage on Any Pin ........V
+0.3V to -0.3V
IN
TC2054/2055/2186 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VIN=VR+1V,IL=100µA, CL=3.3µF, SHDN >VIH,TA= 25°C, unless otherwise noted. BOLDFACE
type specifications apply for junction temperatureof -40°Cto +125°C.
Symbol Parameter Min Typ Max Units Test Conditions
V
IN
I
OUT
MAX
V
OUT
TCV
OUT
∆V
OUT
∆V
IN
∆V
OUT
V
OUT
V
IN–VOUT
I
IN
I
INSD
PSRR Power Supply Rejection Ratio — 50 — dB F
I
OUT
SC
∆V
OUT∆PD
eN Output Noise — 600 — nV /
t
R
Note 1: The minimum V
InputOperatingVoltage 2.7 — 6.0 V Note 1
Maximum Output Current 50
100
150
—
—
—
—
—
—
mA TC2054
TC2055
TC2186
Output Voltage VR-2.0% VR±0.4% VR+2.0% V Note 2
V
Temperature
OUT
Coefficient
/
LineRegulation — 0.05 0.5 %(VR+1V)<VIN< 6V
/
Load Regulation -1.5
—
—
-2.5
20
40
0.5
0.5
—
—
0.5
0.5
ppm/°C Note3
% TC2054;TC2055 IL=0.1mAtoIOUT
TC2186 IL=0.1mAtoIOUT
Note 4
Dropout Voltage, Note 5 —
—
—
—
2
45
90
140
—
70
140
210
mV IL=100µA
TC2015; TC2185 I
TC2185 I
Note 5
Supply Current — 55 80 µASHDN=VIH,IL=0
Shutdown Supply Current — 0.05 0.5 µASHDN=0V
≤ 120kHz
RE
Output Short Circuit Current 160 300 — mA V
OUT
Thermal Regulation — 0.04 — V/W Note 6
IL=I
√Hz
Response Time
(fromShutdown Mode)
has to meet two conditions: VIN= 2.7V and VIN=VR+V
is the regulator output voltage setting. Forexample: VR= 1.8V, 2.7V, 2.8V, 2.85V, 3.0V, 3.3V.
2: V
R
3: TCV
OUT
IN
=
V
OUTM AXVOUTMIN
-----------------------------------------------------------------------------------------
–()106×
V
OUT
—60—µsec VIN=4V
DROPOUT
∆T×
=1µF, C
C
IN
I
=0.1mA,Note 9
L
.
=0V
OUT
,F=10kHz
MAX
OUT
I
=10µF
=50mA
L
=100mA
L
=150mA
L
MAX
MAX
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 achange in power dissipation is applied, exclud-
ing load or line regulation effects. Specifications are for a current pulse equal to I
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. T
8: Hysteresis voltage is referenced by V
9: Time required for V
to reach 95% of VR(output voltage setting), after V
OUT
.
R
A,TJ
, θJA).
SHDN
DS21663B-page 2
at VIN= 6V for T = 10msec.
MAX
is switched from 0 to VIN.
2002 Microchip TechnologyInc.
TC2054/2055/2186
Electrical Characteristics: VIN=VR+1V,IL=100µA, CL=3.3µF,SHDN >VIH,TA= 25°C, unless otherwise noted. BOLDFACE
type specificationsapply for junction temperature of -40°C to +125°C.
Symbol Parameter Min Typ Max Units Test Conditions
SHDN Input
V
IH
V
IL
ERROR OUTPUT
V
INMIN
V
OL
V
TH
V
HYS
t
DELAY
R
ERROR
Note 1: The minimum V
SHDN InputHigh Threshold 60 ——%V
SHDN Input Low Threshold — — 15 %VINVIN= 2.5V to 6.0V
Minimum VINOperating Voltage
Output Logic Low Voltage — — 400 mV 1 mA Flows to ERROR
ERROR Threshold Voltage — 0.95 x V
ERROR Positive Hysteresis — 50 — mV Note 8
V
to ERROR Delay — 2 — msec V
OUT
Resistance from ERROR to
GND
has to meet two conditions: VIN=2.7VandVIN=VR+V
2: V
is the regulator output voltage setting. For example: VR= 1.8V, 2.7V,2.8V , 2.85V, 3.0V, 3.3V.
R
3: TCV
OUT
4: Regulation is measured ata 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 regulationspecification.
5: Dropout voltage is defined as the input to output differential atwhich the output voltage drops 2% below its nominal value at a 1V
differential.
6: Thermal Regulation isdefined 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 I
7: The maximum allowable power dissipation isa function of ambient temperature, the maximum allowable junction temperature
and the thermal resistance from junction-to-air (i.e. T
8: Hysteresis voltage is referenced by V
9: Time required for V
IN
=
V
OUTM AXVOUTMIN
-----------------------------------------------------------------------------------------
–()106×
V
OUT
to reach 95% of VR(output voltage setting), after V
OUT
1.0 — — V V
— V SeeFigure4-2
R
— 126 — Ω VDD=2.5V,V
DROPOUT
∆T×
, θJA).
.
R
A,TJ
SHDN
= 2.5V to 6.0V
INVIN
≥ 2.7V
OUT
from VR=3Vto2.8V
OUT
OUT
.
at VIN= 6V for T =10msec.
MAX
is switched from 0 to VIN.
=2.5V
2.0 PIN DESCRIPTIONS
ThedescriptionsofthepinsarelistedinTable2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin Number Symbol Description
1V
IN
2 GND Ground terminal.
3 SHDN
4 ERROR
5V
OUT
Unregulated supply input.
Shutdown control input. The regulator is fully enabled when a logic high is
applied to this input. The regulator enters shutdown when a logic l ow is
appliedto this input. During shutdown, output voltage falls to zero, ERROR
is open circuited and supplycurrent is reducedto 0.5µA (max).
Out-of-Regulation Flag. (Open drain output). This outputgoes low when
V
is out-of-tolerance byapproximately -5%.
OUT
Regulated voltage output.
2002 Microchip TechnologyInc. DS21663B-page 3
TC2054/2055/2186
3.0 DETAILED DESCRIPTION
The TC2054, TC2055 and TC2186 are precision fixed
output voltage regulators. (If an adjustable version is
desired, please see the TC1070, TC1071 or TC1187
data sheets.) Unlike bipolar regulators, the TC2054,
TC2055 and TC2186 supply current does not increase
with load current. In addition, V
within regulation over the entire 0mA to maximum output current operating load range.
Figure 3-1 showsa typical application circuit. The regulator i s enabled any time the shutdown input (SHDN
is at or above V
SHDN
is at orbelowVIL. SHDN maybecontrolledbya
, and shutdown (disabled) when
IH
CMOS logic gate, or I/O port of a microcontroller. I f the
SHDN
input is not required, it should be connected
directly to the input supply. While in shutdown, supply
current decreases to 0.05µA(typical),V
zero volts, and ERROR
is open-circuited.
FIGURE 3-1: TYPICAL APPLICATION CIRCUIT
V
IN
1µF
BATTERY
Shutdown Control
(to CMOS Logic or Tie
if unused)
to V
IN
TC2054
GND
TC2055
TC2186
C2 Required Only
if ERROR is used as a
Processor RESET Signal
(See Text)
remains stable and
OUT
V
OUT
+
ERRORSHDN
V
1µF
C1
R1
1M
0.2µF
C2
OUT
falls to
V
OUT
BATTLOW
or RESET
FIGURE 3-2: ERROR OUTPUT OPERATION
V
OUT
V
TH
ERROR
V
IH
V
OL
)
3.2 Output Capacitor
A1µF(min)capacitorfromV
OUT
HYSTERESIS (V
to ground is required.
HYS
)
The output capacitor should have an effective series
resistance of 0.01Ω.to5Ω forV
to 5Ω forV
nected from V
<2.5V. A1µF capacitorshould be con-
OUT
to GND if t here is more than 10inches
IN
= 2.5V,and 0.05Ω.
OUT
of wire between the regulator and the AC filter capacitor,or if a batteryisusedasthepowersource.Ceramic,
tantalum and aluminum electrolytic capacitors can be
used. (Since many aluminum electrolytic capacitors
freeze at approximately -30°C, solid tantalums are recommended f or applications operating b elow -25°C).
Whenoperatingfromsourcesother than batteries,supply-noise rejection and transient response can be
improved by increasing the value of the i nput and output capacitors and employing passive f iltering techniques.
3.1 ERROR Open Drain Output
ERROR is driven low whenever V
lationbymorethan-5%(typical).This condition may be
caused by low input voltage, output current limiting or
thermal limiting. The ERROR
rated V
age value (e.g. ERROR
regardless of the programmed output volt-
OUT
=VOLat 4.75V (typ.) for a 5.0V
regulator and 2.85V (typ.) for a 3.0V regulator).
ERROR
Note that ERROR
inactive when V
output operation is shownin Figure 4-2.
isactivewhenV
rises above VTHby V
OUT
As shown in Figure 3-1, ERROR
tery low flag or as a processor RESET
addition of timing capacitor C2). R1 x C2 should be
chosen to maintain ERROR
RESET
input for at least 200msec toallow time for the
below VIHof the processor
system to stabilize. Pull-up resistor R1 can be tied to
V
OUT,VIN
The ERROR
or any other voltage less than (VIN+0.3V).
pin sink current is self-limiting to approxi-
mately 18mA.
falls out of regu-
OUT
threshold is 5% below
fallsto VTH,and
OUT
HYS
.
can be usedas a bat-
signal (with the
DS21663B-page 4
2002 Microchip TechnologyInc.
TC2054/2055/2186
4.0 THERMAL CONSIDERATIONS
4.1 Power Dissipation
The amount ofpower the regulator dissipatesis primarily a function of input and output voltage, and output
current.
The following equation is used to calculate worst case
power dissipation:
EQUATION 4-1:
≈ (VIN–V
P
D
Where:
P
D
V
IN
V
OUT
I
LOAD
MAX
= Worstcase actualpowerdissipation
= Maximum voltage on V
= Minimum regulator output voltage
MIN
= Maximum output ( load) current
MAX
The m aximum allowable power dissipation (Equation
4-2) is a functionofthe maximum ambient temperature
(T
), the maximum allowable die temperature (125
A
MAX
°C) and the thermal resistance from junction-to-air
(θ
). The 5-Pin SOT-23A package has a θJAof
JA
approximately 220°C/Watt when mounted on a typical
two layer FR4 dielectric copper clad PC board.
EQUATION 4-2:
OUT
MIN
)I
LOAD
MAX
IN
Equation 4-1 can be used in conjunction with Equation
4-2 to ensure regulator thermaloperation is within limits.For example:
Given:
V
IN
V
OUT
I
LOAD
T
A
MAX
MAX
=3.0V±5%
= 2.7V– 2.5%
MIN
= 40mA
MAX
= 55°C
Find:1. Actual power dissapation
2. Maximum allowable dissapation
Actual power dissipation:
P
D
≈ (V
IN
MAX
–V
OUT
MIN
)I
LOAD
MAX
= [(3.0 x 1.05) – (2.7 x .975)]40x 10
= 20.7mW
Maximum allowable powerdissipation:
T
T
–()
J
A
MAX
P
D
------------------------------------- -=
MAX
125 55–()
--------------------------220
MAX
θ
JA
–3
T
MAX
---------------------------------- -=
P
D
J
MAX
T
–
A
MAX
θ
JA
Where all termsare previously defined
= 318mW
In this example, the TC2054 dissipates a maximum of
only 20.7mW; far below the allowable limit of 318mW.
In a similar manner,Equation4-1 and Equation 4-2 can
be used to calculate maximum current and/or input
voltage limits.
4.2 Layout Considerations
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a
ground plane, wi de tracesat the pads, and widepower
supply bus lines combine to lower θ
increase the maximum allowable power dissipation
limit.
and, therefore,
JA
2002 Microchip TechnologyInc. DS21663B-page 5
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