SS8047
2.5V 1A Positive Voltage Regulator
Features
Output current in excess of 1A
Output voltage accuracy +3%/-1%
Quiescent current, typically 600µA
Internal short-circuit current-limit
Internal over-temperature protection
General Description
The SS8047 positive 2.5V voltage regulator features
the ability to source 1A of output current. The typical
quiescent current is 0.6mA.
Familiar regulator features such as over-temperature
and over-current protection circuits are provided to
prevent it from being damaged by abnormal operating
conditions.
Applications
n
n
n
n
n
PC motherboard
ADSL/Cable Modem
Set -Top Box
LAN switch/Hub
Router
Ordering Information
SS8047GTXXXX
The SS8047 is only available with Pb-free lead finish.
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 : Tubes
Typical Application
[Note 4] : Type of C
OUT
I
O
V
IN
C1
1µF
Pin Configuration
SS8047
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
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SS8047
Absolute Maximum Ratings
(Note 1)
Input Voltage…………………………………....................................................................…..…..…7V
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 Package………………………….........................................................................…………260°C, 10s
TO 252, TO 263, SOT 223 Pac kage…………......................................................................…...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
Note
(1)
: See Recommended Minimum Footprint.
Operating Conditions
(Note 1)
Input Voltage…………………………….....................................................................…………….3.3V~6V
Temperature Range………………...............................................................................…………0°C
≤
T
J
≤125°C
Electrical Characteristics
V
IN
=5V, I
O
= 1A, C
IN
= 1µF, C
OUT
=10 µF, 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
V
IN
= 5V, 10mA < I
O
< 1A
V
IN
= 3.3V, 10mA < I
O
< 500mA
3.3V < V
IN
< 6V, I
O
= 10mA
V
IN
= 5V, 10mA < I
O
< 1A
V
IN
= 3.3V, 10mA < I
O
< 500mA
200mA DC and 100mA AC, fo = 120Hz
V
IN
= 5V
f
i
= 120Hz,V
ripple
=2V
P-P
, Io = 100mA
I
O
= 1A
I
O
= 500mA
I
O
= 100mA
MIN
2.475
TYP
2.50
3
35
25
80
0.6
46
1.15
420
200
1.6
150
MAX
2.575
30
50
UNITS
V
mV
mV
mV
mΩ
mA
dB
V
mV
mV
A
°C
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 SS8047 in SOT 223 package,
θ
JA
is 156°C/W; in TO 263
package,
θ
JA
is 75°C/W, and in the TO 252 package,
θ
JA
is 125°C/W (See recommend minimum foot-
print). The safe operation in SOT 223,TO 252 & TO 263 package, it can see “Typical Performance
Characteristics” (Safe Operating Area).
Note3:
Low duty pulse techniques are used during test to maintain junction temperature as close to ambient
as possible.
Note4:
The type of output capacitor should be tantalum or aluminum.
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SS8047
Definitions
Dropout Voltage
The input/output Voltage differential at which the regu-
lator output no longer maintains regulation against fur-
ther 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 volt-
age. The measurement is made under conditions of
low dissipation or by using pulse techniques such that
average chip temperature is not significantly affected.
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 using
pulse techniques such that average chip temperature
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.
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SS8047
Typical Performance Characteristics
(V
IN
= +5V, C
IN
=1µF, C
OUT
=10µF, T
A
=25°C, unless otherwise noted.)
Line Transient
Load Transient
Ch1: Vin (offset=5.0V)
Ch2: Vout (offset=2.50V)
CIN = 1uF
Iout=100mA
Ch1: Iout (1A/div)
Ch2: Vout (offset=2.50V)
Output Voltage vs. Load Current
2.600
1200
1100
Dropout Voltage vs. Load Current
Dropout Voltage (mV)
0
100
200
300
400
500
600
700
800
900
1000
2.580
1000
900
800
700
600
500
400
300
200
100
Ootput Voltage (V)
2.560
2.540
2.520
2.500
2.480
0
0
100
200
300
400
500
600
700
800
900
1000
Load Current (mA)
Load Current (mA)
Ground Current vs. Load Current
2.00
1.80
Ground Current (mA)
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
0
100
200
300
400
500
600
700
800
900
1000
Load Current (mA)
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SS8047
Typical Performance Characteristics
(V
IN
= +3.3V, C
IN
=1µF, C
OUT
=10µF, T
A
=25°C, unless otherwise noted.)
Line Transient
Load Transient
Ch1: Vin (offset=3.3V)
Ch2: Vout (offset=2.50V)
CIN = 1uF
Iout=100mA
Ch1: Iout (400mA/div)
Ch2: Vout is AC coupled
Output Voltage vs. Load Current
2.550
2.545
500
450
Dropout Voltage vs. Load Current
Ootput Voltage (V)
2.540
2.535
2.530
2.525
2.520
2.515
2.510
2.505
2.500
0
50 100 150 200 250 300 350 400 450 500 550 600
Dropout Voltage (mV)
400
350
300
250
200
150
100
50
0
0
50
100 150 200 250 300 350 400 450 500 550 600
Load Current (mA)
Load Current (mA)
Ground Current vs. Load Current
2.00
1.80
Ground Current (mA)
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
0
100
200
300
400
500
600
Load Current (mA)
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