ETC1 FS8855-14PX 500ma ldo linear regulator Datasheet

FS8855
500mA LDO Linear Regulator
General Description
Ordering Information
The FS8855 is a low-dropout linear regulator that
operations in the input voltage range from +2.5V to
+9.0V and delivers 500mA output current.
FS8855-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 4.5V
with 100mV increment, except FS8855-29Cx which
has 2.85V output voltage.
The FS8855 consists of a 1.25V bandgap reference,
an error amplifier, and a P-channel pass transistor.
Other features include short-circuit protection and
thermal shutdown protection. The FS8855 devices are
available in TO-92, SOT-89 and SOT-223 packages.
Features
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
Low dropout voltage 650mV at 500mA (Typ.)
C:Commercial Standard
P : Commercial Standard, Lead(Pb) Free and
Phosphorous(P) Free Package
Up to ±35mV output voltage accuracy (VIN
≦7V)
Output Voltage
Preset at 2.5V, 3.3V
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
Mask options from 1.3V to 4.5V
Small output capacitor
Output current limit
Thermal overload shutdown protection
TO-92, SOT-89 and SOT-223 Package
Applications
CD-ROM Drivers
DVD-ROM Drivers
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
Note : Mask option output types are
available by order only
Portable Consumer Equipment
Radio Control Systems
Wireless Communication Systems
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TEL : +886-2-2809-4742
FAX: +886-2-2809-4874
1/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Pin Configurations
TO-92
Part No. Pin 1 Pin 2 Pin 3
FS8855
-xxxD
IN
GND OUT
FS8855
GND
-xxxE
IN
OUT
FS8855
OUT GND
-xxxF
IN
FS8855
GND OUT
-xxxW
IN
1
IN
FS8855
GND
-xxxH
FS8855
-xxxK
3
IN
FS8855
GND
-xxxL
(BOTTOM VIEW)
GND OUT
IN
OUT
FS8855
OUT GND
-xxxI
IN
FS8855
GND OUT
-xxxY
IN
FS8855
xxxxxxxx
1
2
3
SOT-223
Part No. Pin 1 Pin 2 Pin 3
FS8855
-xxxG
2
SOT-89
Part No. Pin 1 Pin 2 Pin 3
GND OUT
IN
FS8855
xxxxxxxx
OUT
FS8855
GND OUT
-xxxJ
IN
FS8855
OUT GND
-xxxX
IN
1
2
3
Package Marking Information
EX:FS8855-33CL
FS8855
33CLxxxx
xxxx:Date Code
EX:FS8855-33PL
FS8855
33PLxxxx
xxxx:Date Code
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FAX: +886-2-2809-4874
2/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Pin Description
Part NO.
FS8855-xxCD
FS8855-xxCE
FS8855-xxCF
FS8855-xxCW
FS8855-xxCG
FS8855-xxCH
FS8855-xxCJ
FS8855-xxCX
FS8855-xxCK
FS8855-xxCL
FS8855-xxCI
FS8855-xxCY
Symbol
GND
Description
Ground pin.
IN
Regulator input pin.
OUT
Regulator output pin.
IN is the regulator input pin. Supply voltage can range from 2.5V to 9.0V. Bypass with a 1µF capacitor to
GND.
OUT is the output voltage pin. Sources up to 500mA. 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-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Typical Application Circuit
Absolute Maximum Ratings
Input voltage VIN to GND -------------------------------------------------------------------------------------------------- 10V
Output current limit, I(LIMIT) -------------------------------------------------------------------------------------------------- 0.8A
Continuous power dissipation, PD (∆T= TJ -TA = 100°C)
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℃ to +150°C
Operating junction temperature range ---------------------------------------------------------------- -40℃ 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-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Electrical Characteristics
(TA=25℃, unless otherwise noted.)
Symbol
VIN
Parameter
Test Conditions
Input Voltage
VIN=VOUT+0.8V, IOUT=1mA, VIN≦7V
VOUT
Output Voltage
VIN=VOUT+0.8V, IOUT=1mA, 7V<VIN
≦9V
∆ VOUT
Output Voltage Accuracy
IMAX
Maximum Load Current
ILIMIT
Current Limit
Min
2.5
VOUT0.035
VOUT0.042
Typ
VOUT
VOUT
Max
Unit
9.0
VOUT+
0.035
VOUT+
0.042
V
V
V
VIN>VOUT+0.8V, VIN≦7V
-35
+35
mV
VIN>VOUT+0.8V, 7V<VIN≦9V
-42
+42
mV
500
mA
0.8
A
ISC
Short-Circuit Current
VOUT=0V, VIN>VOUT+0.8V
350
400
mA
IQ
Ground Pin Current
ILOAD=0mA to 500mA, VIN=VOUT+0.8V
65
120
µA
IOUT=1mA
1
1.2
mV
IOUT=100mA
100
120
mV
IOUT=500mA
650
800
mV
VDROP
Dropout Voltage
∆VLINE
Line Regulation
VOUT+0.8V<VIN<9V, ILOAD=1mA
0.2
0.3
%/V
∆VLOAD
Load Regulation
IOUT=0mA to 500mA
0.01
0.02
%/mA
Output Noise
F=1Hz to 10KHz, COUT=3.3µF
75
µVRMS
Ripple Rejection
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
F=10KHz, COUT=3.3µF
75
dB
155
°C
20
°C
eN
PSRR
TSD
THYS
θJA
Thermal Resistance
Fortune Semiconductor Co.
http://www.fsc.com.tw
SOT-223
155
°C/W
SOT-89
180
°C/W
TO-92
180
°C/W
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5/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Typical Operating Characteristics
(CIN=1.0µF, COUT=3.3µF, TA=+25℃, unless otherwise noted.)
GROUND PIN CURRENT vs. AMBIENT
TEMPERATURE
3.5
80
3
70
GROUND
PIN CURRENT (µA)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
2.5
2
1.5
1
0.5
0
1mA
100mA
250mA
500mA
60
50
40
30
20
10
0
0
1
2
3
4
5
6
7
8
9
-40
-30
INPUT VOLTAGE (V)
-20
-10
0
10
20
30
40
50
60
70
80
AMBIENT TEMPERATURE (℃)
*EX:Model FS8855-33Cx
Ron vs. LOAD CURRENT
DROPOUT VOLTAGE vs. LOAD CURRENT
900
1.30
800
700
1.20
600
Ron (Ω)
DROPOUT VOLTAGE (mV)
1.40
500
400
1.10
1.00
300
200
0.90
100
0
0.80
50
100
150
200
250
300
350
400
450
500
550
600
50
100
LOAD CURRENT (mA)
250
300
350
400
450
500
550
600
GND PIN CURRENT vs. LOAD CURRENT
68
90
GROUND
PIN CURRENT (µA)
80
70
PSRR (db)
200
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO vs.
FREQUENCY
60
50
40
30
20
10
66
64
62
60
58
56
54
0
0.01
150
0.1
1
10
100
1
1000
FREQUENCY (KHz)
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100
200
300
400
500
600
LOAD CURRENT (mA)
6/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
OUTPUT VOLTAGE vs. AMBIENT
TEMPERATURE
GROUND PIN CURRENT vs. INPUT VOLTAGE
160
GROUND PIN CURRENT (µA)
OUTPUT VOLTAGE (V)
3.36
3.34
3.32
3.30
3.28
140
120
100
80
60
40
20
0
3.26
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
0
AMBIENT TEMPERATURE (℃)
1
2
3
4
5
6
7
8
9
OUTPUT NOISE to 1MHz (74uVRMS)
Iload
=0mA
Iload
=500mA
LINE TRANSIENT (IOUT=0mA)
LINE TRANSIENT (IOUT=10mA)
5.0V
4.0V
http://www.fsc.com.tw
5.0V
VIN
4.0V
VOUT
VOUT
Fortune Semiconductor Co.
11
INPUT VOLTAGE (V)
OUTPUT NOISE DC to 1MHz (39uVRMS)
VIN
10
CIN
1µF
COUT
3.3µF
CIN
1µF
COUT
3.3µF
50mV/div
50mV/div
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7/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
LINE TRANSIENT (IOUT=200mA)
LINE TRANSIENT (IOUT=300mA)
5.0V
5.0V
4.0V
VIN
VOUT
4.0V
VIN
VOUT
CIN
1µF
COUT
3.3µF
50mV/div
CIN
1µF
COUT
3.3µF
50mV/div
LOAD TRANSIENT
LOAD TRANSIENT
250mA
100mA
IOUT
0mA
100mA
IOUT
VOUT
VOUT
CIN
1µF
COUT
3.3µF
CIN
1µF
COUT
3.3µF
50mV/div
50mV/div
LOAD TRANSIENT
LOAD TRANSIENT
500mA
500mA
IOUT
250mA
VOUT
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0mA
IOUT
VOUT
CIN
1µF
COUT
3.3µF
CIN
1µF
COUT
3.3µF
50mV/div
100mV/div
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FAX: +886-2-2809-4874
8/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Detail Description
The FS8855 is a low-dropout linear regulator. The
device provides preset 2.5V and 3.3V output voltages
for output current up to 500mA. Other mask options
for special output voltages from 1.3V to 4.5V 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 FS8855 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 FS8855
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 FS8855 output voltage is preset at an
internally trimmed voltage 2.5V, 3.3V or can be
mask-optioned from 1.3V to 4.5V with 100mV
increment. The first two digits of part number suffix
identify the output voltage (see Ordering
Information). For example, the FS8855-33CL has
a preset 3.3V output voltage.
Current Limit
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The FS8855 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 FS8855. 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 FS8855 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 FS8855
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 FS8855 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 FS8855 uses a SOT-89 package and this
package is mounted on a double sided printed
circuit board with two square inches of copper
allocated for “heat spreading”, the resulting θJA is
9/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
180°C/W.
Input-Output Voltage
Based on a maximum operating junction
temperature 125°C with an ambient temperature of
25°C, the maximum power dissipation will be:
PMAX =
(TJ
θ JC
− T A ) (125 − 25)
=
= 0.555W
+ θ CA
180
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
FS8855 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.
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
spreading”.
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VDROPOUT = VIN-VOUT = RDS(ON) x IOUT
10/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Package Outline
SOT-223
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11/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
SOT-89
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TEL : +886-2-2809-4742
FAX: +886-2-2809-4874
12/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
TO-92
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TEL : +886-2-2809-4742
FAX: +886-2-2809-4874
13/13
TD-0405007
Rev. 1.4
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