TC2117
800 mA Fixed Low Dropout Positive Regulator
Features
•
•
•
•
•
•
•
Fixed Output Voltages: 1.8V, 2.5V, 3.0V, 3.3V
Very Low Dropout Voltage
Rated 800 mA Output Current
High Output Voltage Accuracy
Standard or Custom Output Voltages
Overcurrent and Overtemperature Protection
Space Saving SOT-223 Package
General Description
The TC2117 is a fixed, high accuracy (typically ±0.5%)
CMOS low dropout regulator. Designed specifically for
battery operated systems, the TC2117’s CMOS
construction eliminates wasted ground current,
significantly extending battery life. Total supply current
is typically 80 µA at full load (20 to 60 times lower than
in bipolar regulators).
TC2117 key features include ultra low noise, very low
dropout voltage (typically 450 mV at full load), and fast
response to step changes in load. The TC2117
incorporates both overtemperature and overcurrent
protection. The TC2117 is stable with an output
capacitor of only 1µF and has a maximum output
current of 800 mA. This device is available in 3-Pin
SOT-223, and 3-Pin DDPAK packages.
Applications
•
•
•
•
•
•
5V to 3.3V Linear Regulator
Portable Computers
Instrumentation
Battery Operated Systems
Linear Post-Regulator for SMPS
Core Voltage Supply for FPGAs, PLDs, CPUs,
DSPs
Package Types
3-Pin SOT-223
Front View
V
IN
V
OUT
1
2
3
GND
GND
V
OUT
V
IN
3
3-Pin DDPAK
Front View
Tab is V
OUT
Tab is V
OUT
Typical Application
V
IN
C
1
1µF
Battery
V
OUT
V
OUT
C
2
1µF
TC2117
TC2117
GND
TC2117
©
2006 Microchip Technology Inc.
1
2
DS21665C-page 1
TC2117
1.0
ELECTRICAL
CHARACTERISTICS
†
Notice:
Stresses above those listed under "Absolute Maxi-
mum 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.
Absolute Maximum Ratings†
Input Voltage .........................................................6.5V
Output Voltage.................... (V
SS
– 0.3) to (V
IN
+ 0.3V)
Power Dissipation................Internally Limited
(Note 7)
Maximum Voltage on Any Pin .........V
IN
+0.3V to -0.3V
Operating Temperature ............... -40°C < T
J
< +125°C
Storage temperature ..........................-65°C to +150°C
DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
IN
= V
R
+ 1.5V,
(Note 1),
I
L
= 100 µA, C
L
= 3.3 µF, T
A
= +25°C.
Boldface
type specifications apply for junction temperatures of -40°C to +125°C.
Parameters
Input Operating Voltage
Maximum Output Current
Output Voltage
Sym
V
IN
I
OUTMAX
V
OUT
ΔV
OUT
/ΔT
ΔV
OUT
/ΔV
IN
ΔV
OUT
/V
OUT
V
IN
–V
OUT
Min
2.7
800
V
R
– 2.5%
V
R
– 2%
V
OUT
Temperature Coefficient
Line Regulation
Load Regulation
(Note 4)
Dropout Voltage
(Note 5)
—
—
-0.01
—
—
—
—
—
—
—
Supply Current
Power Supply Rejection Ratio
Output Short Circuit Current
Thermal Regulation
Output Noise
Note 1:
I
DD
PSRR
I
OUTSC
ΔV
OUT
/ΔP
D
eN
—
—
—
—
—
Typ
—
—
V
R
± 0.5%
40
0.007
0.002
20
50
150
260
450
1000
1200
80
55
1200
0.04
300
Max
6.0
—
V
R
+ 3%
—
0.35
0
30
160
480
800
1300
1200
1400
130
—
—
—
—
µA
db
mA
V/W
nV/√Hz
F
≤
1 kHz
V
OUT
= 0V
Note 6
I
L
= 100 mA, F = 10 kH
Z
ppm/°C
%
%/mA
mV
Units
V
mA
V
V
R
≥
2.5V
V
R
= 1.8V
Note 3
(V
R
+ 1V)
≤
V
IN
≤
6V
I
L
= 0.1 mA to I
OUTMAX
V
R
≥
2.5V, I
L
= 100 µA
V
R
≥
2.5V,
I
L
=
100
mA
V
R
≥
2.5V,
I
L
= 300 mA
V
R
≥
2.5V,
I
L
= 500 mA
V
R
≥
2.5V,
I
L
= 800 mA
V
R
= 1.8V, I
L
= 500 mA
I
L
= 800 mA
SHDN = V
IH
, I
L
= 0
Note 2
Conditions
V
R
± 0.5%
V
R
+ 2.5%
V
R
is the regulator output voltage setting.
The minimum V
IN
has to justify the conditions: V
IN
≥
V
R
+ V
DROPOUT
and V
IN
≥
2.7V for I
L
= 0.1 mA to I
OUTMAX
.
2:
3:
TCV
OUT
4:
(
V
OUTMAX
–
V
OUTMIN
)
– 10
= ------------------------------------------------------------------------
-
V
OUT
× Δ
T
6
5:
6:
7:
Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested
over a load range from 0.1 mA to the maximum specified output current. Changes in output voltage due to heating
effects are covered by the thermal regulation specification.
Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal
value measured at a 1.5V differential.
Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied,
excluding load or line regulation effects. Specifications are for a current pulse equal to I
LMAX
at V
IN
= 6V for T = 10 ms.
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction tem-
perature and the thermal resistance from junction-to-air (i.e., T
A
, T
J
,
θ
JA
). Exceeding the maximum allowable power dis-
sipation causes the device to initiate thermal shutdown. Please see
Section 4.2 “Thermal Considerations”
for more
details.
DS21665C-page 2
©
2006 Microchip Technology Inc.
TC2117
TEMPERATURE CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
IN
= V
R
+ 1.5V, I
L
= 100 µA, C
L
= 3.3 µF, SHDN > V
IH
, T
A
= +25°C.
Parameters
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 3L-SOT-223
Thermal Resistance, 3L-DDPAK
Note 1:
θ
JA
θ
JA
—
—
59
71
—
—
°C/W
°C/W
T
A
T
J
T
A
-40
-40
-65
—
—
—
+125
+125
+150
°C
°C
°C
(Note 1)
Sym
Min
Typ
Max
Units
Conditions
Operation in this range must not cause T
J
to exceed Maximum Junction Temperature (+125°C).
©
2006 Microchip Technology Inc.
DS21665C-page 3
TC2117
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
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.
0.020
0.018
LINE REGULATION (%)
0.016
0.014
0.012
0.010
0.008
0.006
0.004
0.002
V
IN
= 3.5V to 6.0V
V
OUT
= 2.5V
I
OUT
= 0.1mA
150
135
120
105
90
75
60
45
30
15
0
V
IN
= V
OUT
+1V
I
OUT
= 0.1mA
I
DD
(mA)
V
OUT
= 5V
V
OUT
= 2.5V
0.000
-40°C 0°C
25°C
70°C
85°C
125°C
-40°C 0°C
25°C
70°C
85°C
125°C
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 2-1:
Temperature.
10.0
Line Regulation vs.
FIGURE 2-4:
I
DD
vs. Temperature.
DROPOUT VOLTAGE (V)
1.0
C
IN
= 1 μF
C
OUT
= 1 μF
V
IN
= 6.0V
V
OUT
= 5V
I
OUT
= 100 mA
0.600
0.550
0.500
0.450
0.400
0.350
0.300
0.250
0.200
0.150
0.100
0.050
0.000
85°C
70°C
25°C
V
OUT
= 3V
125°C
0°C
-40°C
0.1
0.0
0.01
0.01
1
10
100
1000
0 100 200 300 400 500 600 700 800
FREQUENCY (kHz)
I
LOAD
(mA)
FIGURE 2-2:
0.0100
Output Noise vs. Frequency.
FIGURE 2-5:
3.030
3.020
3.010
3.000
Dropout Voltage vs. I
LOAD
.
I
LOAD
= 0.1 mA
I
LOAD
= 300 mA
I
LOAD
= 500 mA
LOAD REGULATION %/mA
0.0090
0.0080
0.0070
0.0060
0.0050
0.0040
0.0030
0.0020
0.0010
0.0100
-40°C
0°C
25°C
70°C
85°C
125°C
V
OUT
= 3V
1 mA to 800 mA
V
OUT
(V)
2.990
2.980
2.970
2.960
2.950
2.940
2.930
2.920
-40°C 0°C
25°C
I
LOAD
= 800 mA
70°C
85°C
125°C
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 2-3:
Temperature.
Load Regulation vs.
FIGURE 2-6:
3.0V V
OUT
vs.Temperature.
DS21665C-page 4
©
2006 Microchip Technology Inc.
TC2117
Typical Performance Curves (Continued)
-10
-20
PSRR (dB)
-30
-40
-50
-60
-70
10
100
1k
f (Hz)
I
OUT
=300 mA
V
IN
=4.0V to 5.0V
C
OUT
=10 µF Tantalum (0.25Ω ESR)
C
IN
=NA
V
OUT
50 mV/DIV
10k
100k
1M
FIGURE 2-7:
Ratio.
Power Supply Rejection
FIGURE 2-9:
Line Step Response
V
IN
=4.0V
V
OUT
=3.0V
C
IN
=1 µF Ceramic
C
OUT
=10 µF Ta
50 mV/DIV
600 mA/DIV
FIGURE 2-8:
Load Step Response.
©
2006 Microchip Technology Inc.
DS21665C-page 5
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