E
L
E
C
T
R
O
N
I
C
MT1117
1A LDO LINEAR VOLTAGE / REGULATORS
◆
DESCRIPTION
◆
The MT1117 series are low-drop-out ( LDO ) linear
regulators. The devices have been optimized
for applications where fast transient response and
minimum input voltages are critical. The internal
over-current protection and thermal protection ,makes
the device extremely easy to use in a wide range of
applications.
◆
FEATURES
* Low dropout performance
* Output current of 800mA typical
* Wide range input supply voltage
* Thermal shutdown protection
* Fixed 1.8V, 2.5V, 3.3V output voltages available
* SOT-223 packages available
APPLICATIONS
* Active SCSI terminators
* High efficiency linear regulators
* Motherboard clock supplies
◆
PIN CONFIGURATIONS
TO-252
(Top View)
SOT-223
(Top View)
1
2
3
1
2
3
1: GND, 2: OUT, 3: IN
1: OUT, 2: GND, 3: IN
◆
ABSOLUTE MAXTMUM RETINGS
SYMBOL
PARAMETER
Input supply voltage
Thermal resistance junction to case
SOT-223
TO-252
Thermal resistance junction to ambient
SOT-223
TO-252
MAXIMUM
7
15
10
UNITS
V
IN
θ
JC
V
O
C/W
θ
JA
156
90
O
C/W
O
T
J
Operating junction temperature range
0 to 125
C
O
T
STG
Storage temperature range
- 40 to 150
C
O
T
LEAD
Lead temperature (soldering) 10sec
260
C
Note 1:
Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents
are positive into, negative out of the specified terminal.
http:// www.sirectsemi.com
-1-
MT1117
◆
ORDERING INFORMATION
DEVICE
MT1117A
MT1117-X.X A
PACKAGE
V
OUT
VOLTS
X.X_ 1.5 / 1.8 / 2.5 / 2.8 / 3.0 / 3.3
T
A
(
O
C)
0~70
A
SOT-223
◆
POWER DISSIPATION TABLE:
Package
A
θ
JA
O
( C /W )
156
O
Df( mW/ C)
T
A
≥
25
O
C
O
T
A
≤
25 C
Power rating(mW)
T
A
=70
O
C
Power rating(mW)
588
T
A
= 85
O
C
Power rating (mW)
478
7.35
919
Note :
1.θ
JA
:
Thermal Resistance-Junction to Ambient, D
F
: Derating factor, Po: Power consumption.
Junction Temperature Calculation:
T
J
= T
A
+ (P
D
× θ
JA
), Po = D
F
×
(T
J
- T
A
)
The
θ
JA
numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
2.θ
JT:
Thermal Resistance-Junction to Ambient, T
C
: case(Tab) temperature, T
J
= T
C
+ (P
D
× θ
JT
)
For A package,
θ
JT
= 15.0 C /W.
O
For B package,
θ
JT
= 7.0 C /W.
O
◆
RECOMMENDED OPERATING CONDITIONS:
Symbol
V
IN
I
O
C
IN
C
OUT
T
J
Input Voltage
Load Current (with adequate heatsinking)
Input Capacitor (V
IN
to GND)
Output Capacitor with ESR of 10Ω max., (V
OUT
to GND)
Junction temperature
Parameter
Recommended Operating
Min.
Typ.
Max.
3
6
0.1
1.0
4.7
125
Units
V
mA
μF
μF
O
C
◆
TYPICAL APPLICATIONS:
Fixed Voltage Regulator:
V
IN
MT1117-X.X
V
OUT
C
IN
1μF
I
Q
C
OUT
4.7μF
http:// www.sirectsemi.com
-2-
MT1117
◆
ELECTRICAL CHARACTERISTICS:
O
Operating Conditions: 3V≦ VI
N
≦
6V, T
J
= 0½125
C
unless otherwise specified.
MIN
TYP
MAX
UNITS
SYMBOL
PARAMETER
TEST CONDITION
10mA
≤
I
OUT
≤
1A
T
A
=25
O
C,
MT1117-1.5,
3V
≤
V
IN
≤
5.5
V
MT1117-1.8,
3V
≤
V
IN
≤
5.5V
MT1117-2.5,
3.5V
≤
V
IN
≤
5.5V
MT1117-2.8,
3.8V
≤
V
IN
≤
5.5V
MT1117-3.0,
4V
≤
V
IN
≤
5.5V
MT1117-3.3,
4.3V
≤
V
IN
≤
5.5V
(V
OUT
+1V)
≤
V
IN
≤
5.5V
I
OUT
=10mA
10mA
≤
I
OUT
≤
1A
V
IN
≥2V,
I
OUT
=1A
(V
IN
-V
OUT
)=2V
V
IN
=V
OUT
+1.25
1.5V
≤
(V
IN
-V
OUT
)
≤
5.75V
f = 120Hz,
V
O
Output Voltage (1)
1.764
2.450
3.234
1.8
2.5
3.3
1.836
2.550
3.366
V
V
V
V
SR
V
LR
V
D
I
CL
I
Q
I
O
RA
NOTES:
Line Regulation (1)
Load Regulation (1)
Dropout Voltage (2)
Current Limit
Quiescent Current
Minimum Load Current
Ripple Rejection Ratio
0.005
0.5
0.65
1.5
1
0.1
75
1.0
%
%
V
A
mA
mA
dB
(1) Low duty cycle pulse testing with which T
J
remain unchanged.
(2)
Δ
V
OUT
,
Δ
V
REF
= 1%
◆
TYPICAL PERFORMANCE CHARACTERISTICS:
V
IN
= 5V，C
IN
=10μF，C
OUT
= 22μF，T
A
=25 C unless otherwise specified.
O
DROPOUT VOLTAGE vs. OUTPUT CURRENT
1.3
1.2
Dropout Voltage (V)
1.1
1
0.9
0.8
0.7
0.6
0.5
10
100
300
500
800
Output Current (mA)
http:// www.sirectsemi.com
-3-
MT1117
◆
APPLICATION NOTE:
1.
Maximum Power Dissipation Calculation:
P
D(max)
=
[(V
IN(max)
- V
O(nom)
)]
×
I
O(nom)
+ V
IN(max)
×
I
Q
Where: V
O(nom)
: The nominal output voltage
I
O(nom)
: The nominal output current, and
I
Q
: The quiescent current the regulator consumes at I
O(MAX)
V
IN(max)
: The maximum input voltage
Then
θ
JA
= (150
O
C – T
A
) / P
D
◆
PHYSICAL DIMENSIONS:
3-Pin Surface Mount SOT-223(A)
MILLIMETERS
D
A
c
MIN
A
A1
B
B1
c
D
1.50
0.02
0.60
2.90
0.28
6.30
3.30
TYP
1.65
0.05
0.70
-
0.30
6.50
3.50
2.3 BSC
4.6 BSC
MAX
1.80
0.08
0.80
3.15
0.32
6.70
3.70
B1
H
E
K
L
E
A1
e
e1
e
e1
H
L
K
α
6.70
0.91
1.50
0°
7.00
1.00
1.75
5°
3°
7.30
1.10
2.00
10°
B
β
Sirectifier Global Corp., Delaware, U.S.A.
U.S.A.:
sgc@sirectsemi.com
France:
ss@sirectsemi.com
Taiwan:
se@sirectsemi.com
Hong Kong:
hk@sirectsemi.com
China:
st@sirectsemi.com
…Thailand:
th@sirectsemi.com
Philippines:
aiac@sirectsemi.com
Belize:
belize@sirectsemi.com
http:// www.sirectsemi.com
-4-
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