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FS8853
300mA LDO Linear Regulator
General Description
The FS8853 is a low-dropout linear regulator that operations in the input voltage range from +2.5V to +9.0V and delivers 300mA 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 1.3V to 4.5V with 100mV increment, except FS8853-29Cx which has 2.85V output voltage. The FS8853 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 FS8853 devices are available in TO-92, SOT-89 and SOT-23 packages.
Ordering Information
FS8853-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 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 C : Commercial Standard P : Commercial Standard, Lead(Pb) Free and Phosphorous(P) Free Package Output Voltage 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 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
Features
Low dropout voltage 400mV at 300mA (Typ.) Up to 35mV output voltage accuracy (VIN 7V) Preset at 2.5V, 3.3V Mask options from 1.3V to 4.5V Small output capacitor Output current limit Thermal overload shutdown protection TO-92, SOT-89 and SOT-23 Package
Applications
Battery Powered Equipment Palmtops Portable Cameras and Video Recorders Reference Voltage Sources Post Regulator for Switching Power
Note : Mask option output types are available by order only
Fortune Semiconductor Co.
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1/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
Pin Configurations
Part No. Pin 1 Pin 2 Pin 3 FS8853 -xxxD IN GND OUT IN OUT IN IN
1 TO-92
Part No. Pin 1 Pin 2 Pin 3
3
SOT-89
2
FS8853 -xxxK
IN
GND OUT IN OUT IN IN
FS8853 xxxxxxxx
1 2 3
FS8853 GND -xxxE
(BOTTOM VIEW)
FS8853 OUT GND -xxxF FS8853 GND OUT -xxxW
FS8853 GND -xxxL
FS8853 OUT GND -xxxI FS8853 GND OUT -xxxY
SOT-23 3 ..... ....
Part No. Pin 1 Pin 2 Pin 3 FS8853 -xxxA IN GND OUT IN OUT IN IN
1
3xxx W
2
FS8853 GND -xxxB
FS8853 GND OUT -xxxC FS8853 OUT GND -xxxV
Package Marking Information
SOT-23 EXFS8853-33CC
.....
TO-92 & SOT-89 EXFS8853-33CL
FS8853 33CLxxxx
xxxxDate Code
3 33 C W
.... Top PointLot No. Bottom PointYear w : week, A~Z & A ~ Z
EXFS8853-33PC
.....
EXFS8853-33PL
FS8853 33PLxxxx
xxxxDate Code
3 33 C W
.... Top PointLot No. Bottom PointYear w : week, A~Z & A ~ Z 4th Digit with Underline : Pb/P Free
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
2/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
Pin Description
Part NO. FS8853-xxCA FS8853-xxCB FS8853-xxCC FS8853-xxCV FS8853-xxCD FS8853-xxCE FS8853-xxCF FS8853-xxCW FS8853-xxCK FS8853-xxCL FS8853-xxCI FS8853-xxCY Symbol GND Ground pin. Description
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 1F capacitor to GND. OUT is the output voltage pin. Sources up to 300mA. Bypass with a 3.3F capacitor to GND. GND provides the reference for all voltages.
Functional Block Diagram
IN
Current Limit
Shutdown Logic
Thermal Protection
OUT
R1
1.25V Bandgap Reference
R2
GND
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
3/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
Typical Application Circuit
FS8853
Absolute Maximum Ratings
Input voltage VIN to GND ----------------------------------------------------------------------------------------------------10V Output current limit, I(LIMIT) ------------------------------------------------------------------------------------------------ 0.6A Continuous power dissipation, PD (T= TJ -TA = 100C) 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 100C. Junction Temperature, TJ ------------------------------------------------------------------------------------------------ +155C Storage temperature range, TSTG ---------------------------------------------------------------------- -55C to +150C Operating junction temperature range ----------------------------------------------------------------- -40C to +125C Lead temperature (soldering, 10sec) -------------------------------------------------------------------------------- 260C
* 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.
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
4/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
Electrical Characteristics
(TA=25, unless otherwise noted.) Symbol VIN VOUT Parameter Input Voltage Output Voltage Test Conditions Min Typ Max Unit V V V mV mV mA 0.6 VOUT=0V, VIN>VOUT+0.48V ILOAD=0mA to 300mA, VIN=VOUT+0.48V IOUT=1mA IOUT=100mA IOUT=300mA VLINE VLOAD Line Regulation Load Regulation Output Noise Ripple Rejection Thermal Shutdown Temperature Thermal Shutdown Hysteresis Thermal Resistance VOUT+0.48VVOUT+0.48V, VIN7V VIN>VOUT+0.48V, 7VVIN9V -35 -42 300 9.0 VOUT+ VOUT 0.035 VOUT+ VOUT 0.042 +35 +42
VOUT IMAX ILIMIT ISC IQ
Output Voltage Accuracy Maximum Load Current Current Limit Short-Circuit Current Ground Pin Current
VDROP
Dropout Voltage
eN
PSRR TSD THYS
JA
Fortune Semiconductor Co.
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TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
5/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
Typical Operating Characteristics
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5 3 2.5 2 1.5 1 0.5 0 0 1 2 3 4 5 6 7 8 9
(CIN=1F , COUT=3.3F, TA=+25, unless otherwise noted.)
GROUND PIN CURRENT vs. AMBIENT TEMPERATURE
80
OUTPUT VOLTAGE (V)
GROUND PIN CURRENT (A)
70 60 50 40 30 20 10 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80
1mA 100mA 200mA 300mA
INPUT VOLTAGE (V)
*EXModel FS8853-33Cx
AMBIENT TEMPERATURE ()
DROPOUT VOLTAGE vs. LOAD CURRENT
600
1.50 1.40 1.30
Ron vs. LOAD CURRENT
DROPOUT VOLTAGE (mV)
500 400 300 200 100 0 50 100 150 200 250 300 350 400
Ron()
1.20 1.10 1.00 0.90 0.80
LOAD CURRENT (mA) POWER SUPPLY REJECTION RATIO v.s FREQUENCY
-90 -80 -70
50
100
150
200
250
300
350
400
LOAD CURRENT (mA)
GND PIN CURRENT vs. LOAD CURRENT
70
PSRR (db)
GROUND PIN CURRENT (A)
-60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000
60 50 40 30 20 10 0 0 1 50 100 150 200 250 300 350 400
FREQUENCY (KHz)
LOAD CURRENT (mA)
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
6/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
OUTPUT VOLTAGE vs. AMBIENT TEMPERATURE GROUND PIN CURRENT (A)
3.36
GROUND PIN CURRENT vs. INPUT VOLTAGE
140 120 100 80 60 40 20 0 0 1 2 3 4 5 6 7 8 9 10
OUTPUT VOLTAGE (V)
3.34
3.32
3.3
3.28
3.26 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80
AMBIENT TEMPERATURE ()
INPUT VOLTAGE (V)
OUTPUT NOISE DC to 1MHz (37uVRMS)
OUTPUT NOISE to 1MHz (67uVRMS)
Iload =0mA
Iload =300mA
LINE TRANSIENT (IOUT=0mA)
LINE TRANSIENT (IOUT=10mA)
5.0V VIN 4.0V VIN
5.0V 4.0V
VOUT
CIN 1F COUT 3.3F 50mV/div
VOUT
CIN 1F COUT 3.3F 50mV/div
Fortune Semiconductor Co.
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TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
7/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
LINE TRANSIENT (IOUT=100mA) LINE TRANSIENT (IOUT=200mA)
5.0V VIN 4.0V VIN
5.0V 4.0V
VOUT
CIN 1F COUT 3.3F 50mV/div LOAD TRANSIENT 100mA
VOUT
CIN 1F COUT 3.3F 50mV/div LOAD TRANSIENT
IOUT
0mA
IOUT
200mA 100mA
VOUT CIN 1F COUT 3.3F 100mV/div
VOUT
CIN 1F COUT 3.3F 50mV/div
LOAD TRANSIENT
LOAD TRANSIENT
300mA IOUT 200mA IOUT
300mA 0mA
VOUT CIN 1F COUT 3.3F 50mV/div
VOUT CIN 1F COUT 3.3F 100mV/div
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
8/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
Detail Description
The FS8853 is a low-dropout linear regulator. The device provides preset 2.5V and 3.3V output voltages for output current up to 300mA. 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 FS8853 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 FS8853 does not suffer from these problems and consumes only 65A (Typ.) of ground pin current under heavy loads as well as in dropout conditions. Output Voltage Selection The FS8853 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 FS8853-33CL has a preset 3.3V output voltage.
Fortune Semiconductor Co. TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
Current Limit The FS8853 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 FS8853. When the junction temperature exceeds TJ = +155C, 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 20C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection is designed to protect the FS8853 in the event of fault conditions. For continuous operation, the maximum operating junction temperature rating of TJ = +125C should not be exceeded. Operating Region and Power Dissipation Maximum power dissipation of the FS8853 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
JC
- T A ) (TJ - T A ) = JA + CA
Where (TJ-TA) is the temperature difference between the FS8853 die junction and the surrounding air, JC is the thermal resistance of the package chosen, and CA 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 FS8853 uses a SOT-89 package and this
9/13 TD-0405006 Rev. 1.5
http://www.fsc.com.tw
FS8853
300mA 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 JA is 180 C/W. Based on a maximum operating junction temperature 125 C with an ambient of 25C, the maximum power dissipation will be: 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 FS8853 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
PMAX =
(TJ
JC
- T A ) (125 - 25) = = 0.555W + CA 180
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
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
10/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
Package Outline SOT-23
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
11/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
SOT-89
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
12/13
TD-0405006
Rev. 1.5
FS8853
300mA LDO Linear Regulator
TO-92
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
13/13
TD-0405006
Rev. 1.5

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