FS8856
550 mA LDO Linear Regulator
General Description
The FS8856 is a low-dropout linear regulator
that operations in the input voltage range from
+2.5V to +6.5V and delivers 550mA output
current.
The high-accuracy output voltage is preset at an
internally trimmed voltage 2.5V or 3.3V. Other
output voltages can be mask-optioned from
1.5V to 5.0V with 100mV increment, except
FS8856-29Cx which has 2.85V output voltage.
The FS8856 consist of a 1.25V reference
compare amplifier, and a P-channel pass
transistor. Other features include short-circuit
protection and thermal shutdown protection.
The FS8856 devices are available in TO-92 and
SOT-89 packages.
Ordering Information
FS8856-xx x x
Package
E：TO-92
K：SOT-89
L：SOT-89
I：SOT-89
Y：SOT-89
1.GND
1.IN
1.GND
1.OUT
1.GND
Pin Out
2.IN
2.GND
2.IN
2.GND
2.OUT
3.OUT
3.OUT
3.OUT
3.IN
3.IN
Temperature Range
C：Commercial Standard
P : Commercial Standard, Lead(Pb) Free and
Phosphorous(P) Free Package
Output Voltage
15 : 1.5V
16 : 1.6V
17 : 1.7V
18 : 1.8V
19 : 1.9V
20 : 2.0V
21 : 2.1V
22 : 2.2V
23 : 2.3V
24 : 2.4V
25 : 2.5V
26 : 2.6V
27 : 2.7V
28 : 2.8V
29 : 2.85V
30 : 3.0V
31 : 3.1V
32 : 3.2V
33 : 3.3V
34 : 3.4V
35 : 3.5V
36 : 3.6V
37 : 3.7V
38 : 3.8V
39 : 3.9V
40 : 4.0V
41 : 4.1V
42 : 4.2V
43 : 4.3V
44 : 4.4V
45 : 4.5V
46 : 4.6V
47 : 4.7V
48 : 4.8V
49 : 4.9V
50 : 5.0V
Features
Low dropout voltage 750mV at 550mA
(Typ.)
Up to
±35mV
output voltage accuracy
(V
OUT
≤
3.5V)
Preset at 2.5V, 3.3V
Mask option from 1.5V to 5.0V
Small output capacitor
Output current limit
Thermal overload shutdown
protection
TO-92 and SOT-89 Packages
Note :
Mask option output types are
available by order only.
Applications
CD-ROM Drivers
DVD-ROM Drivers
Portable Consumer Equipment
Radio Control Systems
Wireless Communication Systems
Fortune Semiconductor Corp.
http://www.fsc.com.tw
TEL: +886-2-2809-4742
FAX: +886-2-2809-4874
1/12
FS8856-DS-20_EN
Rev. 2.0
Aug., 2005
FS8856
Pin Configurations
TO-92
SOT-89
Part No. Pin 1 Pin 2 Pin 3
FS8856
GND
-xxxE
IN
OUT
1
2
3
Part No. Pin 1 Pin 2 Pin 3
FS8856
-xxxK
IN
GND OUT
IN
OUT
IN
IN
FS8856
xxxxxxxx
1
2
3
(BOTTOM VIEW)
FS8856
GND
-xxxL
FS8856
OUT GND
-xxxI
FS8856
GND OUT
-xxxY
Package Marking Information
EX：FS8856-33CL
FS8856
33CLxxxx
xxxx：Date Code
EX：FS8856-33PL
FS8856
33PLxxxx
xxxx：Date Code
Pin Description
Part NO.
FS8856-xxxE
FS8856-xxxK
FS8856-xxxL
FS8856-xxxI
FS8856-xxxY
Symbol
GND
IN
OUT
Description
Ground pin that provides the reference for all voltages.
Regulator input pin. Supply voltage can range from 2.5V to
6.5V. Bypass with a 1µF capacitor to GND.
Regulator output pin. Sources up to 550mA. Bypass with a
3.3µF capacitor to GND.
Fortune Semiconductor Corp.
2/12
Rev. 2.0
FS8856
Functional Block Diagram
IN
Current Limit
Shutdown
Logic
Thermal
Protection
OUT
R1
1.25V
Bandgap
Reference
R2
GND
Typical Application Circuit
Absolute Maximum Ratings
Input voltage V
IN
to GND ----------------------------------------------------------------------------------------------------- 7V
Output current limit, I
(LIMIT)
-------------------------------------------------------------------------------------------------- 0.8A
Continuous power dissipation, P
D
SOT-89
----------------------------------------------------------------------------------------------------------------------------------------
0.55W
----------------------------------------------------------------------------------------------------------------------------------------
0.55W
TO-92
* The power dissipation values are based on the condition that junction temperature T
J
and ambient
temperature T
A
difference is 100°C.
Fortune Semiconductor Corp.
3/12
Rev. 2.0
FS8856
Junction Temperature, T
J
----------------------------------------------------------------------------------------------- +155°C
Storage temperature range, T
STG
---------------------------------------------------------------------- -55°C to +150°C
Operating junction temperature range ---------------------------------------------------------------- -40°C to +125°C
Lead temperature (soldering, 10sec) ------------------------------------------------------------------------------- 260°C
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only, and function operation of the device at these or any other conditions beyond those
indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated
conditions for extended periods may affect device reliability.
Electrical Characteristics
(T
A
=25
℃
, unless otherwise noted.)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
V
IN
∆
V
OUT
∆
V
OUT
I
MAX
I
LIMIT
I
SC
I
Q
Input Voltage
Output Voltage Accuracy
1.5V
≤
V
OUT
≤
3.5V
Output Voltage Accuracy
3.5V < V
OUT
≤
5.0V
Maximum Load Current
Current Limit
Short-Circuit Current
Ground Pin Current
2.5
V
IN
>V
OUT
+0.9V, V
IN
≤6.5V
V
IN
>V
OUT
+0.9V, V
IN
≤6.5V
-35
-1.0
550
6.5
+35
+1.0
V
mV
%
mA
0.8
V
OUT
=0V, V
IN
>V
OUT
+0.9V
I
LOAD
=0mA to 550mA, V
IN
=V
OUT
+0.9V
I
OUT
=100mA
I
OUT
=300mA
I
OUT
=500mA
I
OUT
=550mA
V
OUT
+0.9V<V
IN
<6.5V, I
LOAD
=1mA
I
OUT
=0mA to 550mA
350
65
110
350
650
750
0.2
0.02
70
155
10
SOT-89
TO-92
180
180
400
90
130
420
800
900
0.3
0.03
A
mA
µA
mV
mV
mV
mV
%/V
%/mA
dB
°C
°C
°C/W
°C/W
V
DROP
Dropout Voltage
∆V
LINE
∆V
LOAD
PSRR
T
SD
T
HYS
Line Regulation
Load Regulation
Ripple Rejection
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
Thermal Resistance
θ
JA
Fortune Semiconductor Corp.
4/12
Rev. 2.0
FS8856
Typical Operating Characteristics
(C
IN
=1.0µF, C
OUT
=3.3µF, T
A
=+25
℃
, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
7
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
GROUND PIN CURRENT vs. AMBIENT
TEMPERATURE
1mA
100mA
550mA
OUTPUT VOLTAGE (V)
2.5
2
1.5
1
0.5
0
INPUT VOLTAGE (V)
*EX
：
Model FS8856-33Cx
GROUND
PIN CURRENT (µA)
3
AMBIENT TEMPERATURE (
℃
)
DROPOUT VOLTAGE vs. LOAD CURRENT
0.8
1.40
Ron vs. LOAD CURRENT
DROPOUT VOLTAGE (V)
0.7
0.6
1.30
0.4
0.3
0.2
0.1
0.0
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.55
0.6
Ron (
Ω
)
0.5
1.20
1.10
1.00
0.90
0.80
100
150
200
250
300
350
400
450
500
550
LOAD CURRENT (A)
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO vs.
FREQUENCY
-100
GND PIN CURRENT vs. LOAD CURRENT
62
GROUND
PIN CURRENT (µA)
-90
-80
60
58
56
54
52
50
48
PSRR (dB)
-70
-60
-50
-40
-30
-20
-10
0
0.01
0.1
1
10
100
1000
0
1
50
100
150
200
250
300
350
400
450
500
550
FREQUENCY (KHz)
LOAD CURRENT (mA)
Fortune Semiconductor Corp.
5/12
Rev. 2.0
Test/Measurement
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