• Low Dropout Voltage: 200mV typ. at 80mA,
380mV typ. at 160mA
• High Output Current: 180mA (V
• High Accuracy Output Voltage (±2%)
• Low Power Consumption: 11µA (Oper.),
0.1µA (Shutdown)
• Low Temperature Drift (±100ppm/°C typ.)
• Excellent Line Regulation (0.2%/V typ.)
• Space Saving 5-Pin SOT-23A Package
• Short Circuit Protection
• Standard 2.5V, 3.0V and 3.3V Output Voltages
OUT
= 5.0V)
Applications
• Battery Powered Devices
• Cameras and Portable Video Equipment
• Pagers and Cellular Phones
• Solar Powered Instruments
• Consumer Products
Device Selection Table
Output
Part Number
TC562502ECT2.55-Pin SOT-23A -40°C to +85°C
TC563002ECT3.05-Pin SOT-23A -40°C to +85°C
TC563302ECT3.35-Pin SOT-23A -40°C to +85°C
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
Voltage
(V)*
Package
Temperature
Range
Package Type
5-Pin SOT-23A
V
OUT
5
NC
4
TC56
13
V
SS
General Description
The TC56 is a low supply current (11µA typical at
= 3V), low dropout CMOS linear regulator, with a
V
OUT
10V maximum input volt age range. CMOS cons truction
eliminates wasted ground current, typical of bipolar
regulators, for greater system efficiencies and longer
operating time in battery-powered systems. The TC56
enters shutdown mode when the shutdown control
input (SHDN
shut off, and supply current falls to 0.1µA maximum.
Normal operation is restored when SHDN
a logic high. Low current consumption, 10V supply
tolerance and space-saving 5-Pin SOT-23A packaging
makes the TC56 ideal for a wide varie ty of applicati ons.
) is low. During shutdown, the regulator is
Functional Block Diagram
5
V
OUT
2
V
IN
4
(NC)
SHDN
is returned to
V
OUT
10µF
Tantalum
TC56
V
V
SS
1
V
IN
2002 Microchip Technology Inc.DS21436B-page 1
IN
2
SHDN
3
4.7
µF
Tantalum
ON OFF
Shutdown
Control
TC56
1.0ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage ........................................................+12V
Output Current .................................... ...... ..... ...500mA
Output Voltage.......................V
SHDN
Input Voltage..............VSS – 0.3V to VIN + 0.3V
– 0.3V to VIN + 0.3V
SS
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or 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 may affect device reliability.
Power Dissipation (SOT-23).............................150mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range..............-40°C to +125°C
TC56 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VIN = V
SymbolParameterMinTypMaxUnitsTest Conditions
V
IN
V
OUT
I
OUTMAX
∆V
OUT
V
- V
IN
I
DD
I
SHDN
∆V
OUT
∆V
OUT
V
IH
V
IL
I
IH
I
IL
Note 1: VR is the regulator output voltage setting.
Input Voltage——10V
Output Voltage0.98 x VRVR ±0.5% 1.02 x V
Maximum Output Current150
Load Regulation—
Dropout Voltage—
OUT
Supply Current—
Shutdown Supply Current——0.1µAV
/∆VINLine Regulation—0.20.3%/VI
/∆TV
Temperature Coefficient—±100—ppm/°CI
OUT
SHDN Input High Logic Threshold1.5——V
SHDN Input Low Logic Threshold——0.25V
SHDN Input Current @V
SHDN Input Current @V
2: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at a
1V differential.
+1V, TA = 25°C, CIN = 4.7µF, C
OUT
180
—
—
—
—
—
IH
IL
——5.0µAV
-0.2-0.050µAV
—
—
45
40
200
380
165
330
11
13
= 10µF, unless otherwise noted.
OUT
VI
—
—
90
80
395
770
330
660
19
21
R
mAVR ≥ 2.7V, V
mV1mA ≤ I
mVI
OUT
V
1mA
OUT
I
OUT
I
OUT
I
OUT
µAV
V
OUT
OUT
= 40mA (Note 1)
= 3V (Note 1)
≥ 4.5V, V
R
OUT
OUT
≤ 80mA, V
OUT
≤ I
≤ 80mA, V
OUT
= 80mA, V
= 5V (Note 1)
OUT
= 160mA, V
= 100mA, V
= 200mA, V
= VIN = 4V
SHDN
= VIN = 6V
SHDN
= GND
SHDN
= 40mA, 4V ≤ VIN ≤ 10V
= 10mA, -40°C < T
= V
SHDN
SHDN
IN
= GND
OUT
OUT
= 3V
= 3V
OUT
= 5V
OUT
= 5V (Note 2)
OUT
< +85°C
J
= 3V
= 5V
DS21436B-page 2 2002 Microchip Technology Inc.
2.0PIN DESCRIPTIONS
The descriptions of the pins are listed in Table2-1.
TABLE 2-1:PIN FUNCTION TABLE
TC56
Pin No.
(5-Pin SOT-23A)
1V
2V
3SHDN
4(NC)No connection.
5V
SymbolDescription
SS
IN
OUT
Ground.
Supply voltage input.
Shutdown input.
Regulated voltage output.
3.0DETAILED DESCRIPTION
The TC56 is a precision, fixed output LDO. Unlike
bipolar regulations, the TC56 supply current does not
increase with load current.
3.1Output Capacitor
A 10µF tantalum capacitor from V
recommended. The output capacitor should have an
effective se ries re sistance greate r than 0.1Ω and less
than 5.0Ω, and a resonant frequency above 1M Hz. It is
recommended that a 4.7µF capacitor be connected
from V
to GND. When operating from sources other
IN
than batteries, supply noise rejection and transient
response can be improved by increasing the value of
the input and output c ap a ci tors and emplo yin g p a ss iv e
filterin g techniques.
to ground is
OUT
3.2Shutdown Input
The TC56 enters a low power shutdown mode when
the shutdown control input (SHDN
shutdown, the regulator is disabled and supply current
is reduced to 0.1µA (max). Normal operation is
restored when SHDN
input can be tied to VIN.
SHDN
is driven high. If n ot requ ired, th e
) is low. During
2002 Microchip Technology Inc.DS21436B-page 3
TC56
4.0THERMAL CONSIDERATIONS
4.1Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input and output voltage, and
output current. The following equation is used to
calculate worst case actual power dissipation.
EQUATION 4-1:
PD ≈ (V
Where:
P
= Worst case actual power dissipation
D
= Maximum voltage on V
V
INMAX
V
I
LOADMAX
= Minimum regulator output voltage
OUTMIN
= Maximum output (load) current
The maximum allowable power dissipation
(Equation 4-2) is a function of the maximum ambient
temperature (T
temperature (T
junction-to-air (θ
of approximately 220°C/Watt.
a θ
JA
AMAX
JMAX
JA
EQUATION 4-2:
P
DMAX
Where all terms are previously defined.
– V
INMAX
OUTMIN)ILOADMAX
IN
), the maximum allowable die
) and the thermal resistance from
). The 5-Pin SOT-23A package has
= (T
JMAX
– T
θ
JA
AMAX
)
Equation 4-1 can be used in conjunction with
Equation 4-2 to ensure regulator thermal operation is
within limits. For ex ample:
Given:
V
INMAX
V
OUTMIN
I
LOADMAX
T
JMAX
T
AMAX
=3.0V ±10%
=2.7V – 2%
= 98mA
= 125°C
=55°C
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
Actual power dissipation:
≈ (V
P
D
= [(3.0 x 1.1) – (2.7 x .98)]98 x 10
INMAX
– V
OUTMIN)ILOADMAX
-3
=64mW
Maximum allowable power dissipation:
P
DMAX
= (T
JMAX
– T
θ
JA
AMAX
)
= (125 – 55)
220
= 318mW
In this example, the TC56 dissipates a maximum of
64mW; below the allowab le limit o f 318mW. In a similar
manner , Equation4-1 and Equatio n 4-2 can be used to
calculate maximum current and/or input voltage limits.
4.2Layout Considerations
The primary path of heat conductio n out of the p ackage
is via the package lea ds. Theref ore, layouts having a
ground plane, wide tra ces at the p ads , and wi de power
supply bus lines combine to lower θ
increase the maximum allowable power dissipation
limit.
and therefore,
JA
DS21436B-page 4 2002 Microchip Technology Inc.
TC56
02040
60100
0
OUTPUT CU
I
(mA)
040
80120140180
OUTPUT CU
I
)
U
O
G
)
)
5.1
)
8
9
5.0
0
60100160
OPR
5
C
C
30
C
V
6V
C
4.7
µ
0
µ
)
8
9
3.0
3.1
80
60
80
OPR
5
C
30
C
80
C
V=4V
C
0
µ
5
3.0
3.5
)
)
5
610
V
(V)
84.6
5
5.5
V
(V)
V
(V)
V
(V)
5.0
5.2
)
3.05
85
3
5
0
U
O
G
)
)
95
3.10
5
8
9
85
90
95
5.00
5.05
5.10
6
8
3.0
3.2
3.00
90
6
8
9
OUT
OUT=OUT
m
A
OPR
5
C
C
0
µ
)
OPR
5
C
C
C
µ
OPR
5
C
C
C
µ
OPR
5
C
C
0
µ
5.0TYPICAL CHARACTERISTICS
Note:The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are pro vided for information al purposes only. The perfo rmance characteris tics listed herei n are
not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
1. OUTPUT VOLTAGE vs. OUTPUT CURRENT
TC565002 (5V
=
F, C = 1
=
F (Tantalum
TC563002 (3V
=µF, C = 1
RRENT
= 2
OUT
80°
(mA
(V)
OUT
-
4.
4.
OUTPUT VOLTAGE V
2
2. OUTPUT VOLTAGE vs. INPUT VOLTAGE
TC565002 (5V)
=µF, C = 1
V
T
4.
OUTPUT VOLTAGE V
4.
INPUT VOLTAGE
10mA
= 2
F (Tantalum
40m
V
T
-
E V
2.
LTA
T V
2.
TP
TC565002 (5V)
=µF,
V
UT
4.
4.
UTPUT VOLTAGE V
4.
= 1mA, 10
40mA
INPUT VOLTAGE
RRENT
= 2
14
1201
OUT
= 2
1
TC563002 (3V
=µF, C = 1
(V)
OUT
2.
2.
OUTPUT VOLTAGE V
=
2.
INPUT VOLTAGE
10mA
40mA
= 2
V
T
E V
LTA
2.
T V
TP
2.
2.
TC563002 (3V
=µF,
= 1mA
OUT
40mA
INPUT VOLTAGE
= 2
1
2002 Microchip Technology Inc.DS21436B-page 5
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