SS8061G
1A Low Dropout Regulator with Enable
FEATURES
Adjustable output from 1.2V to 4.8V
Output voltage options 1.5V, 1.8V and 2.5V
(externally adjustable using resistors)
Over-current and over-temperature protection
Dropout voltage of 400mV at 1A load
Enable pin
Quiescent current of 10µA in shutdown
SOT-89-5 Package
DESCRIPTION
The
SS8061
is a high performance positive voltage
regulator designed for use in applications requiring
very low dropout voltage at up to 1 Amps. Since it has
superior dropout characteristics compared to regular
LDOs, it can be used to supply 2.5V on motherboards
or 1.5V, 1.8V on peripheral cards from the 3.3V supply
thus allowing the elimination of costly heatsinks. An
enable-pin further reduces power dissipation while
in
shut-down. The
SS8061
provides excellent regulation
over variations in line, load and temperature.
The
SS8061
is available with 1.5V, 1.8V and 2.5V
internally preset outputs that are also adjustable using
external resistors.
APPLICATIONS
Battery-powered systems
Motherboards
Peripheral cards
Network cards
Set Top Boxes
Medical Equipment
Notebook Computers
ORDERING INFORMATION
SS8061-15GTETR
SS8061-18GTETR
SS8061-25GTETR
1.5V
output, in SOT89-5 with Pb-free lead finish, shipped on tape and reel.
1.8V output, in SOT89-5 with Pb-free lead finish, shipped on tape and reel.
2.5V output, in SOT89-5 with Pb-free lead finish, shipped on tape and reel.
This device is only available with Pb-free lead finish (second-level interconnect).
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
R3
I
ENH
SS8061G
VEN
VIN
VO
GND
SS8061G
VIN
5
VEN
4
VEN
VIN
VO
R1
C1
22µF
C2
47µF
R2
ADJ
1
ADJ
2
GND
3
VO
Volts
R2
R2=12kΩ is recommended
VO =
R3 should be connected for current I
ENH
restriction as V
EN
> V
IN
+0.3V
1.2 (R1+R2)
SOT-89-5
1/21/2005 Rev.2.01
www.SiliconStandard.com
1 of 6
SS8061G
ABSOLUTE MAXIMUM RATINGS
Input Voltage……………………………………………..7V
V
EN
Voltage…………..…………………………..V
IN
+0.3V
Power Dissipation Internally Limited
(Note 2)
Maximum Junction Temperature…………………150°C
Storage Temperature Range……..-65°C
≤T
J
≤
+150°C
Reflow Temperature (soldering, 10sec)……..….260°C
Thermal Resistance Junction to Ambient…..…177°C/W
Thermal Resistance Junction to Case………..…52°C/W
ESD Rating (Human Body Model)…………..………2kV
OPERATING CONDITIONS
(note 1)
Input Voltage………………………………….2.2V ~5.5V
Temperature Range………….………-40°C
≤T
A
≤
+85°C
ELECTRICAL CHARACTERISTICS
V
EN
=V
IN
, V
IN
=5V, I
O
= 0.5A, C
IN
= 4.7µF, C
OUT
=10µF, T
A
= T
J
= 25°C unless otherwise specified (Note 3)
PARAMETER
Supply Voltage
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Ripple Rejection
Dropout Voltage
Short Circuit Current
Over Temperature
V
EN
Voltage High
V
EN
Voltage Low
V
EN
Bias Current Low
ADJ Reference Voltage
ADJ Pin Threshold
V
D
I
Q
SYMBOL
V
IN
V
O
CONDITION
V
IN
=V
O
+0.7V, I
O
=10mA
V
O
+0.7V < V
IN
< 5.5V, I
O
=10mA
10mA < I
O
< 1A
V
IN
=3.3V,V
EN
=V
IN
V
IN
=3.3V,V
EN
=0V
fi=120Hz, 1V
P-P
, I
O
=100mA
I
O
=1A
MIN
2.2
-2
---
---
---
---
---
---
---
---
1.6
---
---
1.188
---
TYP
---
V
O
0.2
0.8
1.7
16
55
0.4
0.8
150
---
---
---
1.2
0.2
MAX
5.5
2
2
2
2.5
35
---
0.6
---
---
---
0.4
20
1.212
---
UNIT
V
%
%
%
mA
µA
dB
V
A
°C
V
V
µA
V
V
V
ENH
V
ENL
I
ENL
V
REF
Output Active
Output Disabled
V
EN
=0.4V
V
IN
=2.2V, V
ADJ
=V
OUT
, I
O
=10mA
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions
are conditions under which the device functions but the specifications might not be guaranteed. For guaranteed
specifications and test conditions see the Electrical Characteristics.
Note2:
The maximum power dissipation is a function of the maximum junction temperature, T
Jmax
; total thermal resis-
tance,
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.
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.
Definitions
Dropout Voltage
The input/output Voltage differential at which the regula-
tor output no longer maintains regulation against further
reductions in input voltage. Measured when the output
drops 2% below its nominal value, dropout voltage is
affected by junction temperature, load current and mini-
mum input supply requirements.
Line Regulation
The change in output voltage for a change in input voltage.
The measurement is made under conditions of low dissi-
pation 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.
1/21/2005 Rev.2.01
www.SiliconStandard.com
2 of 6
Microcontroller MCU
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