ETC1 FS8854-28CB 350ma ldo linear regulator Datasheet

FS8854
350mA LDO Linear Regulator
General Description
Ordering Information
The FS8854 is a low-dropout linear regulator that
operations in the input voltage range from +2.5V
to +6.5V and delivers 350mA output current.
FS8854-xx x x
Package
A : SOT-23
B : SOT-23
C : SOT-23
V : SOT-23
D : TO-92
E : TO-92
F : TO-92
W : TO-92
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
FS8854-29Cx which has 2.85V output voltage.
The FS8854 consist 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 FS8854 devices are available in
TO-92, SOT-89 and SOT-23 packages.
Pin Out
1.IN
1.GND
1.GND
1.OUT
1.IN
1.GND
1.OUT
1.GND
1.IN
1.GND
1.OUT
1.GND
2.GND
2.IN
2.OUT
2.GND
2.GND
2.IN
2.GND
2.OUT
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
Features
C : Commercial Standard
P : Commercial Standard, Lead(Pb) Free and
Phosphorous(P) Free Package
Low dropout voltage 500mV at 350mA
(Typ.)
Output Voltage
Up to ±35mV output voltage accuracy
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
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-23 Package
Applications
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.
Battery Powered Equipment
Palmtops
Portable Cameras and Video Recorders
Reference Voltage Sources
Post Regulator for Switching Power
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1/13
TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
Pin Configurations
TO-92
Part No. Pin 1 Pin 2 Pin 3
FS8854
-xxxD
IN
GND OUT
FS8854
GND
-xxxE
IN
OUT
FS8854
OUT GND
-xxxF
IN
FS8854
GND OUT
-xxxW
IN
Part No. Pin 1 Pin 2 Pin 3
FS8854
-xxxA
IN
FS8854
GND
-xxxB
GND OUT
IN
OUT
FS8854
GND OUT
-xxxC
IN
FS8854
OUT GND
-xxxV
IN
1
2
SOT-89
Part No. Pin 1 Pin 2 Pin 3
FS8854
-xxxK
3
IN
GND OUT
FS8854
GND
-xxxL
(BOTTOM VIEW)
IN
OUT
FS8854
OUT GND
-xxxI
IN
FS8854
GND OUT
-xxxY
IN
FS8854
xxCxxxxx
1
2
3
SOT-23
3
.....
4xxx W
....
1
2
Package Marking Information
SOT-23
TO-92 & SOT-89
EX:FS8854-33CC
EX:FS8854-33CL
.....
FS8854
33CLxxxx
433C
...
W
Top Point:Lot No.
Bottom Point:Year
w : week, A~Z & A ~ Z
xxxx:Date Code
EX:FS8854-33PC
EX:FS8854-33PL
.....
FS8854
33PLxxxx
433C
...
.
W
Top Point:Lot No.
Bottom Point:Year
w : week, A~Z & A ~ Z
A dot after marking : Pb/P Free
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FAX: +886-2-2809-4874
xxxx:Date Code
2/13
TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
Pin Description
Part NO.
FS8854-xxCA
FS8854-xxCB
FS8854-xxCC
FS8854-xxCV
FS8854-xxCD
FS8854-xxCE
FS8854-xxCF
FS8854-xxCW
FS8854-xxCK
FS8854-xxCL
FS8854-xxCI
FS8854-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 6.5V. Bypass with a 1µF capacitor to
GND.
OUT is the output voltage pin. Sources up to 350mA. 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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TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
Typical Application Circuit
FS8854
Absolute Maximum Ratings
Input voltage VIN to GND ------------------------------------------------------------------------------------------------------7V
Output current limit, I(LIMIT) ------------------------------------------------------------------------------------------------ 0.6A
Continuous power dissipation, PD (∆T= TJ -TA = 100°C)
SOT-23 ---------------------------------------------------------------------------------------------------------------------------------------- 0.31W
SOT-89 ---------------------------------------------------------------------------------------------------------------------------------------- 0.55W
TO-92
---------------------------------------------------------------------------------------------------------------------------------------- 0.55W
* 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-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
Electrical Characteristics
(TA=25℃, unless otherwise noted.)
Symbol
VIN
VOUT
Parameter
Test Conditions
Input Voltage
Output Voltage
VIN=VOUT+0.6V, IOUT=1mA
∆ VOUT
Output Voltage Accuracy
VIN>VOUT+0.6V, 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
350
V
mV
mA
0.6
A
ISC
Short-Circuit Current
VOUT=0V, VIN>VOUT+0.6V
140
160
mA
IQ
Ground Pin Current
ILOAD=0mA to 350mA, VIN=VOUT+0.6V
65
90
µA
IOUT=100mA
120
145
mV
IOUT=300mA
400
480
mV
IOUT=350mA
500
600
mV
VDROP
Dropout Voltage
∆VLINE
Line Regulation
VOUT+0.6V<VIN<6.5V, ILOAD=1mA
0.2
0.3
%/V
∆VLOAD
Load Regulation
IOUT=0mA to 350mA
0.02
0.03
%/mA
Output Noise
F=1Hz to 10KHz, COUT=3.3µF
70
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 Corp.
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SOT-23
320
°C/W
SOT-89
180
°C/W
TO-92
180
°C/W
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5/13
TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
Typical Operating Characteristics
(CIN=1µF , COUT=3.3µF, TA=+25℃, unless otherwise noted.)
GROUND PIN CURRENT vs. AMBIENT
TEMPERATURE
65
3
60
GROUND
PIN CURRENT (µA)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5
2.5
2
1.5
1
1mA
100mA
200mA
350mA
55
50
45
40
35
0.5
30
0
0
1
2
3
4
5
6
-40
7
-30
DROPOUT VOLTAGE vs. LOAD CURRENT
0
10
20
30
40
50
60
70
80
Ron vs. LOAD CURRENT
0.7
1.60
0.6
1.50
1.40
Ron (Ω)
0.5
0.4
0.3
1.30
1.20
1.10
0.2
1.00
0.1
0.90
0.0
50
100
150
200
250
300
350
0.80
400
50
100
LOAD CURRENT (mA)
200
250
300
350
400
GND PIN CURRENT vs. LOAD CURRENT
-100
60.00
GROUND
PIN CURRENT (µA)
-90
-80
-70
-60
-50
-40
-30
-20
-10
58.00
56.00
54.00
52.00
50.00
48.00
46.00
0
0.01
150
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO vs.
FREQUENCY
PSRR (db)
-10
AMBIENT TEMPERATURE (℃)
INPUT VOLTAGE (V)
*EX:Model FS8854-33Cx
DROPOUT VOLTTAGE
(V)
-20
0
0.1
1
10
100
1000
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50
100
150
200
250
300
350
400
LOAD CURRENT (mA)
FREQUENCY (KHz)
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TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
OUTPUT VOLTAGE vs. AMBIENT
TEMPERATURE
GROUND PIN CURRENT vs. INPUT
VOLTAGE
3.36
70
GROUND PIN CURRENT
(µA)
OUTPUT VOLTAGE (V)
80
3.34
60
3.32
50
40
3.3
30
20
3.28
10
3.26
0
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
0
AMBIENT TEMPERATURE (℃)
1
2
3
4
5
LINE TRANSIENT (IOUT=0mA)
5.0V
4.0V
4.0V
VIN
CIN
1µF
COUT
3.3µF
VOUT
CIN
1µF
COUT
3.3µF
VOUT
50mV/div
50mV/div
LINE TRANSIENT (IOUT=200mA)
LINE TRANSIENT (IOUT=350mA)
5.0V
VIN
VOUT
5.0V
4.0V
4.0V
VIN
CIN
1µF
COUT
3.3µF
CIN
1µF
COUT
3.3µF
VOUT
50mV/div
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7
LINE TRANSIENT (IOUT=10mA)
5.0V
VIN
6
INPUT VOLTAGE (V)
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50mV/div
7/13
TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
LOAD TRANSIENT
LOAD TRANSIENT
100mA
IOUT
VOUT
200mA
0mA
IOUT
100mA
CIN
1µF
COUT
3.3µF
VOUT
CIN
1µF
COUT
3.3µF
50mV/div
50mV/div
LOAD TRANSIENT
LOAD TRANSIENT
350mA
IOUT
VOUT
200mA
CIN
1µF
COUT
3.3µF
350mA
0mA
IOUT
CIN
1µF
COUT
3.3µF
VOUT
50mV/div
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100mV/div
8/13
TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
Detail Description
Current Limit
The FS8854 is a low-dropout linear regulator. The
device provides preset 2.5V and 3.3V output
voltages for output current up to 350mA. 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 FS8854 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 FS8854 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 FS8854 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 FS8854-33CL has
a preset 3.3V output voltage.
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The FS8854 also include 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 0.6A.
Thermal Overload Protection
Thermal overload protection limits total power
dissipation in the FS8854. 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 FS8854 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 FS8854
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 FS8854 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 FS8854 uses a SOT-89 package and this
9/13
TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
package is mounted on a double sided printed
circuit board with two square inches of copper
allocated for “heat spreading”, the resulting θJA is
180°C/W.
Based on a maximum operating junction
temperature 125°C with an ambient of 25°C, the
maximum power dissipation will be:
PMAX =
(TJ
θ JC
− T A ) (125 − 25)
=
= 0.555W
+ θ CA
180
spreading”.
Input-Output Voltage
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 FS8854 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.
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-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
Package Outline
SOT-23
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11/13
TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
SOT-89
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12/13
TD-0410025
Rev. 1.4
FS8854
350mA LDO Linear Regulator
TO-92
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13/13
TD-0410025
Rev. 1.4
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