ETC2 FS8856-29CF 550ma ldo linear regulator Datasheet

FS8856
550mA LDO Linear Regulator
General Description
Ordering Information
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.
FS8856-xx x x
Package
D : TO-92
E : TO-92
F : TO-92
W : TO-92
G : SOT-223
H : SOT-223
J : SOT-223
X : SOT-223
K : SOT-89
L : SOT-89
I : SOT-89
Y : SOT-89
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
1.3V 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,
SOT-89 and SOT-223 packages.
Pin Out
1.IN
1.GND
1.OUT
1.GND
1.IN
1.GND
1.GND
1.OUT
1.IN
1.GND
1.OUT
1.GND
2.GND
2.IN
2.GND
2.OUT
2.GND
2.IN
2.OUT
2.GND
2.GND
2.IN
2.GND
2.OUT
3.OUT
3.OUT
3.IN
3.IN
3.OUT
3.OUT
3.IN
3.IN
3.OUT
3.OUT
3.IN
3.IN
Temperature Range
C : Commercial Standard
P : Commercial Standard, Lead(Pb) Free and
Phosphorous(P) Free Package
Features
Output Voltage
Low dropout voltage 750mV at 550mA
(Typ.)
13 : 1.3V
14 : 1.4V
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
Up to ±35mV output voltage accuracy
Preset at 2.5V, 3.3V
Mask option from 1.3V to 5.0V
Small output capacitor
Output current limit
Thermal overload shutdown
protection
TO-92, SOT-89 and SOT-223 Packages
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
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 Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742
FAX: +886-2-2809-4874
1/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Pin Configurations
TO-92
Part No. Pin 1 Pin 2 Pin 3
FS8856
-xxxD
IN
GND OUT
FS8856
GND
-xxxE
IN
1
OUT
FS8856
OUT GND
-xxxF
IN
FS8856
GND OUT
-xxxW
IN
IN
FS8856
GND
-xxxH
2
FS8856
-xxxK
3
IN
FS8856
GND
-xxxL
(BOTTOM VIEW)
GND OUT
IN
OUT
FS8856
OUT GND
-xxxI
IN
FS8856
GND OUT
-xxxY
IN
FS8856
xxxxxxxx
1
2
3
SOT-223
Part No. Pin 1 Pin 2 Pin 3
FS8856
-xxxG
SOT-89
Part No. Pin 1 Pin 2 Pin 3
GND OUT
IN
FS8856
xxxxxxxx
OUT
FS8856
GND OUT
-xxxJ
IN
FS8856
OUT GND
-xxxX
IN
1
2
3
Package Marking Information
EX:FS8856-33CL
FS8856
33CLxxxx
xxxx:Date Code
EX:FS8856-33PL
FS8856
33PLxxxx
xxxx:Date Code
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2/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Pin Description
Part NO.
FS8856-xxCD
FS8856-xxCE
FS8856-xxCF
FS8856-xxCW
FS8856-xxCG
FS8856-xxCH
FS8856-xxCJ
FS8856-xxCX
FS8856-xxCK
FS8856-xxCL
FS8856-xxCI
FS8856-xxCY
Symbol
GND
IN
OUT
Description
Ground pin.
Regulator input pin.
Regulator output pin.
IN is the regulator input pin. Supply voltage can range from 2.5V to 6.5V. Bypass with a 1µF capacitor to
GND.
OUT is the output voltage pin. Sources up to 550mA. Bypass with a 3.3µF capacitor to GND.
GND provides the reference for all voltages.
Functional Block Diagram
IN
Current Limit
Thermal
Protection
Shutdown
Logic
OUT
R1
1.25V
Bandgap
Reference
R2
GND
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3/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Typical Application Circuit
FS8856
Absolute Maximum Ratings
Input voltage VIN to GND ----------------------------------------------------------------------------------------------------- 7V
Output current limit, I(LIMIT) -------------------------------------------------------------------------------------------------- 0.8A
Continuous power dissipation, PD
SOT-223 ---------------------------------------------------------------------------------------------------------------------------------------- 0.65W
SOT-89 ---------------------------------------------------------------------------------------------------------------------------------------- 0.55W
---------------------------------------------------------------------------------------------------------------------------------------- 0.55W
TO-92
* The power dissipation values are based on the condition that junction temperature TJ and ambient
temperature TA difference is 100°C.
Junction Temperature, TJ ----------------------------------------------------------------------------------------------- +155°C
Storage temperature range, TSTG ---------------------------------------------------------------------- -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.
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4/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Electrical Characteristics
(TA=25℃, unless otherwise noted.)
Symbol
VIN
VOUT
Parameter
Test Conditions
Input Voltage
Output Voltage
VIN=VOUT+0.9V, IOUT=1mA
∆ VOUT
Output Voltage Accuracy
VIN>VOUT+0.9V, VIN≦6.5V
IMAX
Maximum Load Current
ILIMIT
Current Limit
Min
2.5
VOUT0.035
-35
Typ
Max
Unit
V
VOUT
6.5
VOUT+
0.035
+35
550
V
mV
mA
0.8
A
ISC
Short-Circuit Current
VOUT=0V, VIN>VOUT+0.9V
350
400
mA
IQ
Ground Pin Current
ILOAD=0mA to 550mA, VIN=VOUT+0.9V
65
90
µA
IOUT=100mA
110
130
mV
IOUT=300mA
350
420
mV
IOUT=500mA
650
800
mV
IOUT=550mA
750
900
mV
VDROP
Dropout Voltage
∆VLINE
Line Regulation
VOUT+0.9V<VIN<6.5V, ILOAD=1mA
0.2
0.3
%/V
∆VLOAD
Load Regulation
IOUT=0mA to 550mA
0.02
0.03
%/mA
PSRR
TSD
THYS
θJA
Ripple Rejection
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
Thermal Resistance
Fortune Semiconductor Co.
http://www.fsc.com.tw
75
dB
155
°C
20
°C
SOT-223
155
°C/W
SOT-89
180
°C/W
TO-92
180
°C/W
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5/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Typical Operating Characteristics
(CIN=1.0µF, COUT=3.3µF, TA=+25℃, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
70
3
GROUND
PIN CURRENT (µA)
OUTPUT VOLTAGE (V)
3.5
2.5
2
1.5
1
0.5
GROUND PIN CURRENT vs. AMBIENT
TEMPERATURE
60
1mA
100mA
550mA
50
40
30
20
10
0
0
0
1
2
3
4
5
6
7
-40
-30
INPUT VOLTAGE (V)
*EX:Model FS8856-33Cx
-10
0
10
20
30
40
50
60
70
80
AMBIENT TEMPERATURE (℃)
Ron vs. LOAD CURRENT
DROPOUT VOLTAGE vs. LOAD CURRENT
1.40
0.8
0.7
1.30
0.6
1.20
0.5
Ron (Ω)
DROPOUT VOLTAGE (V)
-20
0.4
0.3
1.10
1.00
0.2
0.1
0.90
0.0
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.55
0.80
0.6
100
LOAD CURRENT (A)
250
300
350
400
450
500
550
GND PIN CURRENT vs. LOAD CURRENT
62
-100
GROUND
PIN CURRENT (µA)
-90
-80
PSRR (dB)
200
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO vs.
FREQUENCY
-70
-60
-50
-40
-30
-20
-10
60
58
56
54
52
50
48
0
0.01
150
0.1
1
10
100
0
1000
FREQUENCY (KHz)
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1
50
100
150
200
250
300
350
400
450
500
550
LOAD CURRENT (mA)
6/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
OUTPUT VOLTAGE vs. AMBIENT
TEMPERATURE
GROUND PIN CURRENT vs. INPUT VOLTAGE
80
GROUND PIN CURRENT (uA)
OUTPUT VOLTAGE (V)
3.36
3.34
3.32
3.3
3.28
3.26
-40
-30
-20
-10
0
10
20
30
40
50
60
70
70
60
50
40
30
20
10
0
80
0
AMBIENT TEMPERATURE (℃)
1
2
3
4
5
LINE TRANSIENT (IOUT=0mA)
5.0V
4.0V
CIN
1µF
COUT
3.3µF
VOUT
7
LINE TRANSIENT (IOUT=10mA)
5.0V
VIN
6
INPUT VOLTAGE (V)
4.0V
VIN
CIN
1µF
COUT
3.3µF
VOUT
50mV/div
50mV/div
LINE TRANSIENT (IOUT=550mA)
LINE TRANSIENT (IOUT=250mA)
5.0V
5.0V
VIN
VOUT
4.0V
4.0V
CIN
1µF
COUT
3.3µF
VIN
VOUT
50mV/div
LOAD TRANSIENT
50mV/div
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CIN
1µF
COUT
3.3µF
7/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
100mA
250mA
IOUT
0mA
IOUT
100mA
VOUT
CIN
1µF
COUT
3.3µF
VOUT
CIN
1µF
COUT
3.3µF
50mV/div
50mV/div
LOAD TRANSIENT
LOAD TRANSIENT
550mA
IOUT
250mA
VOUT
CIN
1µF
COUT
3.3µF
500mA
IOUT
0mA
CIN
1µF
COUT
3.3µF
VOUT
100mV/div
50mV/div
LOAD TRANSIENT
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8/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Detail Description
Current Limit
The FS8856 is a low-dropout linear regulator. The
device provides preset 2.5V and 3.3V output
voltages for output current up to 550mA. Other
mask options for special output voltages from 1.3V
to 5.0V with 100mV increment are also available.
As illustrated in function block diagram, it consists
of a 1.25V reference, error amplifier, P-channel
pass transistor and an internal feedback voltage
divider.
The 1.25V bandgap reference is connected to the
error amplifier, which compares this reference with
the feedback voltage and amplifies the voltage
difference. If the feedback voltage is lower than
the reference voltage, the pass-transistor gate is
pulled lower, which allows more current to pass to
the output pin and increases the output voltage. If
the feedback voltage is too high, the pass-transistor
gate is pulled up to decrease the output voltage.
The output voltage is feedback through an internal
resistive divider connected to OUT pin. Additional
blocks include an output current limiter, thermal
sensor, and shutdown logic.
Internal P-channel Pass Transistor
The FS8856 features a P-channel MOSFET pass
transistor. Unlike similar designs using PNP pass
transistors, P-channel MOSFETs require no base
drive, which reduces ground pin current.
PNP-based regulators also waste considerable
current in dropout when the pass transistor
saturates, and use high base-drive currents under
large loads. The FS8856 does not suffer from these
problems and consumes only 65µA (Typ.) of
ground pin current under heavy loads as well as in
dropout conditions.
Output Voltage Selection
The FS8856 output voltage is preset at an
internally trimmed voltage 2.5V, 3.3V or can be
mask-optioned from 1.3V to 5.0V with 100mV
increment. The first two digits of part number suffix
identify the output voltage (see Ordering
Information). For example, the FS8856-33CL has
a preset 3.3V output voltage.
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The FS8856 also includes a fold back current
limiter. It monitors and controls the pass transistor’s
gate voltage, estimates the output current, and
limits the output current within 0.8A.
Thermal Overload Protection
Thermal overload protection limits total power
dissipation in the FS8856. When the junction
temperature exceeds TJ = +155°C, a thermal
sensor turns off the pass transistor, allowing the IC
to cool down. The thermal sensor turns the pass
transistor on again after the junction temperature
cools down by 20°C, resulting in a pulsed output
during continuous thermal overload conditions.
Thermal overload protection is designed to protect
the FS8856 in the event of fault conditions. For
continuous operation, the maximum operating
junction temperature rating of TJ = +125°C should
not be exceeded.
Operating Region and Power Dissipation
Maximum power dissipation of the FS8856
depends on the thermal resistance of the case and
circuit board, the temperature difference between
the die junction and ambient air, and the rate of
airflow. The power dissipation across the devices is
P = IOUT x (VIN-VOUT). The resulting maximum
power dissipation is:
PMAX =
(TJ
θ JC
− T A ) (TJ − T A )
=
θ JA
+ θ CA
Where (TJ-TA) is the temperature difference
between the FS8856 die junction and the
surrounding air, θJC is the thermal resistance of the
package chosen, and θCA is the thermal resistance
through the printed circuit board, copper traces and
other materials to the surrounding air. For better
heat-sinking, the copper area should be equally
shared between the IN, OUT, and GND pins.
If the FS8856 uses a SOT-89 package and this
package is mounted on a double sided printed
9/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
circuit board with two square inches of copper
allocated for “heat spreading”, the resulting θJA is
180°C/W.
spreading”.
Based on a maximum operating junction
temperature 125°C with an ambient of 25°C, the
maximum power dissipation will be:
A regulator’s minimum input-output voltage differential,
or dropout voltage, determines the lowest usable
supply voltage. In battery-powered systems, this will
determine the useful end-of-life battery voltage. The
FS8856 uses a P-channel MOSFET pass transistor,
its dropout voltage is a function of drain-to-source
on-resistance (RDS(ON)) multiplied by the load current.
PMAX =
(TJ
θ JC
− T A ) (125 − 25)
=
= 0.555W
+ θ CA
180
Input-Output Voltage
VDROPOUT = VIN-VOUT = RDS(ON) x IOUT
Thermal characteristics were measured using a
double sided board with 1” x 2” square inches of
copper area connected to the GND pin for “heat
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10/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Package Outline
SOT-223
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11/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
SOT-89
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12/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
TO-92
Fortune Semiconductor Co.
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13/13
TD-0405008
Rev. 1.3
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