SS8027G
3.3V 1A Low Dropout Regulator
FEATURES
Dropout voltage typically 0. 8V @ I
O
= 1A
Output current in excess of 1A
Output voltage accuracy ±2%
Quiescent current, typically 600µA
Internal short circuit current limit
Internal over temperature protection
DESCRIPTION
The SS8027G positive 3.3V voltage regulator features
the ability to source 1A of output current with a drop-
out voltage of typically 0.8V over the entire operating
temperature range. A low quiescent current is pro-
vided over the entire output current range. The typical
quiescent current is 0.6mA. Furthermore, quiescent
current is reduced when the regulator is in the
dropout mode (V
IN
< 3.3V).
Familiar regulat or features such as over-temperature
and over-current protection circuits are provided to
prevent the device from being damaged by abnormal
operating conditions.
APPLICATIONS
CD-R/W
ADSL
Cable Modem
Set -Top-Box
LAN switch/Hub
Router
DVD-R/W
Pb-free, RoHS compliant.
ORDERING INFORMATION
SS8027GTXXXX
Packing Type
Pin Option
Package Type
PACKAGE TYPE
GT3 : TO 220 Pb-free
GT4 : TO 252 Pb-free
GT5 : TO 263 Pb-free
GT6 : SOT 223 Pb-free
PIN OPTION
1
1 : V
OUT
2 : V
OUT
3 : GND
4 : GND
5 : V
IN
6 : V
IN
2
GND
V
IN
V
OUT
V
IN
GND
V
OUT
3
V
IN
GND
V
IN
V
OUT
V
OUT
GND
PACKING
TR : Tape & Reel
TB : Tube
TYPICAL APPLICATION
PIN CONFIGURATION
I
O
V
IN
SS8027G
C1
0.47µF
IQ
V
OUT
C
OUT
10µF
Top View
Top View
Top View
1
2
3
1
2
3
1
2
3
TO-220
TO-252 and TO-263
SOT-223
5/26/2005 Rev.2.2
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SS8027G
Absolute Maximum Ratings
(Note 1)
Input Voltage……………………….……………...................................................................……..……10V
Power Dissipation Internally Limited
.
(Note 2)
Maximum Junction Temperature.…..……………...............................................................………...150°C
Storage Temperature Range….……....................................................................................…...-65°C
≤
T
J
≤+150°C
Lead Temperature, Time for Wave Soldering
TO 220, TO 263 Pac kage…………….........................................................................…..………..260°C, 10s
TO 252, SOT 223 Package………………….........................................................................………260°C, 4s
Continuous Power Dissipation (T
A
= +25°C)
SOT 223
(1)
……………………..................................................................………….………………....0.8W
TO 252
(1)
……………………………..................................................................….………………..….1.0W
TO 263
(1)
……………………………..................................................................….………………..….1.6W
TO 220
(1)
………………………….………..................................................................……………..….2.0W
Note
(1)
: See Recommended Minimum Footprint
Operating Conditions
(Note 1)
Input Voltage……………………………….....................................................................…………….4V~7V
Temperature Range………….…….........................................................................................……-40°C
≤
T
J
≤125°C
Electrical Characteristics
V
IN
=5V, I
O
= 1A, C
IN
= 1µF, C
OUT
=10µF, All specifications apply for T
A
= T
J
= 25°C. [Note 3]
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Ripple Rejection
Dropout Voltage
Short Circuit Current
Over Temperature
CONDITIONS
50mA < I
O
<1A
4V < V
IN
< 7V, I
O
= 10mA
50mA < I
O
< 1A
200mA DC and 100mA AC, fo = 120Hz
V
IN
= 5V
f
i
= 120Hz, 1V
P-P
, Io = 100mA
I
O
= 1A
I
O
= 100mA
MIN
3.234
TYP
3.3
20
30
100
0.6
42
0.8
200
1.9
125
MAX
3.366
30
50
UNITS
V
mV
mV
mΩ
mA
dB
V
mV
A
°C
1.6
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Con-
ditions are conditions under which the device functions but the specifications might not be guaranteed.
For guaranteed specifications and test conditions see the Electrical Characteristics.
Note 2:
The maximum power dissipation is a function of the maximum junction temperature, T
Jmax
, total thermal
resistance,
θ
JA
, and ambient temperature T
A
. The maximum allowable power dissipation at any ambient
temperature is T
jmax
-T
A
/
θ
JA
. If this dissipation is exceeded, the die temperature will rise above 150°C
and IC will go into thermal shutdown. For the SS8027G in the SOT-223 package,
θ
JA
is 156°C/W; in the
TO-252 pac kage,
θ
JA
is 125°C/W; in the TO-263 package,
θ
JA
is 75°C/W, and in the TO-220 package,
θ
JA
is 60°C/W (no heat sink). [See Recommended Minimum Footprint] If the TO-220 package is used
with a heat sink,
θ
JA
is the sum of the package thermal resistance junction-to-case (θ
JC
) of 3°C/W and
the thermal resistance added by the heat sink and thermal interface.The thermal resistance can be
reduced by increasing the P.C. board copper area thermally connected to the pac kage. The safe op-
eration area of SOT-223, TO-252, TO-263 or TO-220 packages can be seen in “Typical Performance
Characteristics” (Safe Operating Area).
Note3:
Low duty-cycle pulse techniques are used during test to maintain the junction temperature as close
to ambient temperature as possible.
Note4:
The output capacitor should be a tantalum or aluminum type.
5/26/2005 Rev.2.2
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2 of 10
SS8027G
Definitions
Dropout Voltage
The input/output voltage differential at which the regu-
lator output no longer maintains regulation against
further reductions in input voltage. Measured when the
output drops 100mV below its nominal value, dropout
voltage is affected by junction temperature, load cur-
rent and minimum input supply requirements.
Line Regulation
The change in output voltage for a change in input
voltage. The measurement is made under conditions
of low dissipation or by using pulse techniques, so
that average chip temperature is not significantly af-
fected.
Load Regulation
The change in output voltage for a change in load cur-
rent at constant chip temperature. The measurement
is made under conditions of low dissipation or by u
s-
ing pulse techniques, so that average chip tempera-
ture is not significantly affected.
Maximum Power Dissipation
The maximum total device dissipation for which the
regulator will operate within specifications.
Quiescent Bias Current
Current which is used to operate the regulator chip
and is not delivered to the load.
5/26/2005 Rev.2.2
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3 of 10
SS8027G
Typical Performance Characteristics
(V
IN
=5V, C
IN
=1µF, C
OUT
=10µF, T
A
=25°C, unless otherwise noted.)
Line Transient
Load Transient
Ch1: Vout (offset=3.30V)
Ch2: Vin (offset=5.0V)
Iout=100mA
Ch1: Vout (offset=3.30V)
Ch2: Iout (780mA/div)
Output Voltage vs. Load Current
3.380
1200
Dropout Voltage vs. Load Current
3.360
1000
Output Voltage (V)
3.340
Dropout Voltage (mV)
0
100
200
300
400
500
600
700
800
900
1000
800
3.320
600
3.300
400
3.280
200
3.260
0
0
100
200
300
400
500
600
700
800
900
1000
Load Current (mA)
Load Current (mA)
Ground Current vs. Load Current
2.2
2.0
1.8
Ground Current (mA)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0
100
200
300
400
500
600
700
800
900
1000
Load Current (mA)
5/26/2005 Rev.2.2
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SS8027G
Typical Performance Characteristics
(continued)
Safe Operating Area of SOT 223
1200
1100
1000
900
800
1.0
Maximum Power Dissipation of SOT 223
0.9
0.8
0.7
Maximum recommended output current T
A
=25°C,Still Air
1oz Copper on SOT 223
Package Mounted on
recommended mimimum
footprint (R
£
J A
=156°C/W)
c
Power Dissipation (W)
Output Current (mA)
700
600
500
400
300
200
100
0
0.0 0.2
0.4
0.6
0.8 1.0
1.2
TA=25
¢ J
TA=55¢
J
TA=85¢
J
0.6
0.5
0.4
0.3
0.2
0.1
0.0
Still Air
1oz Copper on SOT 223
Package Mounted on
recommend mimimum
footprint (R
£
J A
=156°C/W)
c
1.4
1.6
1.8 2.0
2.2
2.4
2.6 2.8
3.0
3.2
25
35
45
55
65
75
85
95
105
115
125
Input-Output Voltage Differential VIN-VOUT (V)
Note: V
IN(max)
<= 6.5V
Amibent Temperature T
A
(°C)
Safe Operating Area of TO 252
1200
1100
1000
900
Output Current (mA)
TA=25¢
J
Maximum Power Dissipation of TO 252
1.2
1.1
1.0
0.9
Maximum recommended output current T
A
=25°C,Still Air
700
600
500
400
300
200
100
0
0.0
0.2 0.4
0.6
0.8
1.0
1.2 1.4
1.6
1.8
2.0 2.2
2.4
2.6
2.8 3.0
3.2
Power Dissipation (W)
800
TA=55¢
J
TA=85
¢ J
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
25
35
45
55
65
75
85
95
105
115
125
1oz Copper on TO 252
Package Mounted on
recommended
mimimum footprint
(R
£
J A
=125°C/W)
c
Still Air
1oz Copper on TO 252
Package Mounted on
recommend mimimum
footprint (R
£
J A
=125°C/W)
c
Input-Output Voltaage Differential VIN-VOUT (V)
Note: V
IN(max)
<= 6.5V
Amibent Temperature T
A
(°C)
Safe Operating Area of TO 263
1200
1100
1000
900
1.4
1.8
Maximum Power Dissipation of TO 263
1.6
Maximum recommended output current T
A
=25°C,Still Air
Output Current (mA)
700
TA=25¢
J
Power Dissipation (W)
800
1.2
1.0
0.8
0.6
0.4
0.2
0.0
600
500
400
300
200
100
0
0.0
0.2 0.4
0.6
0.8
1.0
1.2 1.4
1.6
1.8
2.0 2.2
2.4
2.6
2.8
3.0 3.2
TA=55¢
J
TA=85
¢ J
1oz Copper on TO 263
Package Mounted on
recommended mimimum
footprint (R
£
JA
=75°C/W)
c
Still Air
1oz Copper on TO 263
Package Mounted on
recommend mimimum
footprint (R
£
J A
=75°C/W)
c
25
35
45
55
65
75
85
95
105
115
125
Input-Output Voltaage Differential VIN-VOUT (V)
Note: V
IN(max)
<= 6.5V
Amibent Temperature T
A
(¢ )
J
5/26/2005 Rev.2.2
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