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FS8855
500mA LDO Linear Regulator
General Description
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. 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.
Ordering Information
FS8855-xx x x
Package DTO-92 ETO-92 FTO-92 WTO-92 GSOT-223 HSOT-223 JSOT-223 XSOT-223 KSOT-89 LSOT-89 ISOT-89 YSOT-89 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
Features
Low dropout voltage 650mV at 500mA (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-223 Package
Temperature Range CCommercial 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
Applications
CD-ROM Drivers DVD-ROM Drivers Portable Consumer Equipment Radio Control Systems Wireless Communication Systems
Note : Mask option output types are available by order only
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
1/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Pin Configurations
Part No. Pin 1 Pin 2 Pin 3 FS8855 -xxxD IN GND OUT IN OUT IN IN
1 TO-92
Part No. Pin 1 Pin 2 Pin 3
3
SOT-89
2
FS8855 -xxxK
IN
GND OUT IN OUT IN IN
FS8855 xxxxxxxx
1 2 3
FS8855 GND -xxxE
(BOTTOM VIEW)
FS8855 OUT GND -xxxF FS8855 GND OUT -xxxW
FS8855 GND -xxxL
FS8855 OUT GND -xxxI FS8855 GND OUT -xxxY
SOT-223
Part No. Pin 1 Pin 2 Pin 3 FS8855 -xxxG IN GND OUT IN OUT IN IN
1
FS8855 GND -xxxH
FS8855 xxxxxxxx
2 3
FS8855 GND OUT -xxxJ FS8855 OUT GND -xxxX
Package Marking Information
EXFS8855-33CL
FS8855 33CLxxxx
xxxxDate Code
EXFS8855-33PL
FS8855 33PLxxxx
xxxxDate Code
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 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 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 500mA. 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-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 = 100C) 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 100C. Junction Temperature, TJ ----------------------------------------------------------------------------------------------- +155C Storage temperature range, TSTG ---------------------------------------------------------------------- -55 to +150C Operating junction temperature range ---------------------------------------------------------------- -40 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-0405007
Rev. 1.4
FS8855
500mA 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 0.8 VOUT=0V, VIN>VOUT+0.8V ILOAD=0mA to 500mA, VIN=VOUT+0.8V IOUT=1mA VDROP VLINE VLOAD Dropout Voltage Line Regulation Load Regulation Output Noise Ripple Rejection Thermal Shutdown Temperature Thermal Shutdown Hysteresis Thermal Resistance IOUT=100mA IOUT=500mA VOUT+0.8V2.5 VOUTVIN=VOUT+0.8V, IOUT=1mA, VIN7V 0.035 VIN=VOUT+0.8V, IOUT=1mA, 7VVIN VOUT0.042 9V VIN>VOUT+0.8V, VIN7V VIN>VOUT+0.8V, 7VVIN9V -35 -42
9.0 VOUT+ VOUT 0.035 VOUT+ VOUT 0.042 +35 +42 500
VOUT IMAX ILIMIT ISC IQ
Output Voltage Accuracy Maximum Load Current Current Limit Short-Circuit Current Ground Pin Current
eN
PSRR TSD THYS
JA
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
5/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Typical Operating Characteristics
(CIN=1.0F, COUT=3.3F, TA=+25, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5
80
GROUND PIN CURRENT vs. AMBIENT TEMPERATURE GROUND PIN CURRENT (A)
70 60 50 40 30 20 10 0
OUTPUT VOLTAGE (V)
3 2.5 2 1.5 1 0.5 0 0 1 2 3 4 5 6 7 8 9
1mA 100mA 250mA 500mA
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
INPUT VOLTAGE (V)
*EXModel FS8855-33Cx
AMBIENT TEMPERATURE ()
DROPOUT VOLTAGE vs. LOAD CURRENT
1.40
Ron vs. LOAD CURRENT
DROPOUT VOLTAGE (mV)
900 800 700
1.30
1.20
500 400 300 200
Ron ()
50 100 150 200 250 300 350 400 450 500 550 600
600
1.10
1.00
0.90
100 0
0.80 50 100 150 200 250 300 350 400 450 500 550 600
LOAD CURRENT (mA)
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO vs. FREQUENCY
90
68
GND PIN CURRENT vs. LOAD CURRENT GROUND PIN CURRENT (A)
80 70
66 64 62 60 58 56 54
PSRR (db)
60 50 40 30 20 10 0 0.01 0.1 1 10 100 1000
1
100
200
300
400
500
600
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-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
OUTPUT VOLTAGE vs. AMBIENT TEMPERATURE GROUND PIN CURRENT (A)
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 3.36
GROUND PIN CURRENT vs. INPUT VOLTAGE
160 140 120 100 80 60 40 20 0 0 1 2 3 4 5 6 7 8 9 10 11
OUTPUT VOLTAGE (V)
3.34
3.32
3.30
3.28
3.26
AMBIENT TEMPERATURE ()
OUTPUT NOISE DC to 1MHz (39uVRMS)
INPUT VOLTAGE (V)
OUTPUT NOISE to 1MHz (74uVRMS)
Iload =0mA LINE TRANSIENT (IOUT=0mA) LINE TRANSIENT (IOUT=10mA)
Iload =500mA
5.0V VIN 4.0V VIN
5.0V 4.0V
VOUT
VOUT
CIN 1F COUT 3.3F 50mV/div Fortune Semiconductor Co. TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 7/13 TD-0405007
CIN 1F COUT 3.3F 50mV/div Rev. 1.4
http://www.fsc.com.tw
FS8855
500mA LDO Linear Regulator
LINE TRANSIENT (IOUT=200mA) 5.0V VIN 4.0V VIN LINE TRANSIENT (IOUT=300mA) 5.0V 4.0V
VOUT
VOUT
CIN 1F COUT 3.3F 50mV/div LOAD TRANSIENT LOAD TRANSIENT
CIN 1F COUT 3.3F 50mV/div
100mA IOUT 0mA IOUT
250mA 100mA
VOUT VOUT CIN 1F COUT 3.3F 50mV/div LOAD TRANSIENT LOAD TRANSIENT CIN 1F COUT 3.3F 50mV/div
500mA IOUT 250mA IOUT
500mA 0mA
VOUT CIN 1F COUT 3.3F 50mV/div Fortune Semiconductor Co. TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
VOUT CIN 1F COUT 3.3F 100mV/div 8/13 TD-0405007 Rev. 1.4
http://www.fsc.com.tw
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 65A (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
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 = +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 FS8855 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 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
JC
- T A ) (TJ - T A ) = JA + CA
Where (TJ-TA) is the temperature difference between the FS8855 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 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 JA is
9/13 TD-0405007 Rev. 1.4
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
FS8855
500mA LDO Linear Regulator
180C/W. Input-Output Voltage Based on a maximum operating junction temperature 125C with an ambient temperature of 25C, 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 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. 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 spreading".
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
10/13
TD-0405007
Rev. 1.4
FS8855
500mA LDO Linear Regulator
Package Outline SOT-223
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
11/13
TD-0405007
Rev. 1.4
FS8855
500mA 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-0405007
Rev. 1.4
FS8855
500mA 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-0405007
Rev. 1.4

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