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FS8856
550mA LDO Linear Regulator
General Description
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. 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.
Ordering Information
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 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 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 46 : 4.6V 47 : 4.7V 48 : 4.8V 49 : 4.9V 50 : 5.0V
Features
Low dropout voltage 750mV at 550mA (Typ.) 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
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.
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1/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Pin Configurations
Part No. Pin 1 Pin 2 Pin 3 FS8856 -xxxD IN GND OUT IN OUT IN IN
1 TO-92
Part No. Pin 1 Pin 2 Pin 3
3
SOT-89
2
FS8856 -xxxK
IN
GND OUT IN OUT IN IN
FS8856 xxxxxxxx
1 2 3
FS8856 GND -xxxE
(BOTTOM VIEW)
FS8856 OUT GND -xxxF FS8856 GND OUT -xxxW
FS8856 GND -xxxL
FS8856 OUT GND -xxxI FS8856 GND OUT -xxxY
SOT-223
Part No. Pin 1 Pin 2 Pin 3 FS8856 -xxxG IN GND OUT IN OUT IN IN
1
FS8856 GND -xxxH
FS8856 xxxxxxxx
2 3
FS8856 GND OUT -xxxJ FS8856 OUT GND -xxxX
Package Marking Information
EXFS8856-33CL
FS8856 33CLxxxx
xxxxDate Code
EXFS8856-33PL
FS8856 33PLxxxx
xxxxDate Code
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
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 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 6.5V. Bypass with a 1F capacitor to GND. OUT is the output voltage pin. Sources up to 550mA. 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
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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 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.
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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 VOUT IMAX ILIMIT ISC IQ Parameter Input Voltage Output Voltage Output Voltage Accuracy Maximum Load Current Current Limit Short-Circuit Current Ground Pin Current VOUT=0V, VIN>VOUT+0.9V ILOAD=0mA to 550mA, VIN=VOUT+0.9V IOUT=100mA VDROP Dropout Voltage IOUT=300mA IOUT=500mA IOUT=550mA VLINE VLOAD PSRR TSD THYS Line Regulation Load Regulation Ripple Rejection Thermal Shutdown Temperature Thermal Shutdown Hysteresis SOT-223 Thermal Resistance SOT-89 TO-92 VOUT+0.9VVOUT+0.9V, VIN6.5V Test Conditions Min 2.5 VOUT0.035 -35 550 0.8 400 90 130 420 800 900 0.3 0.03 Typ Max Unit V V mV mA A mA A mV mV mV mV %/V %/mA dB C C C/W C/W C/W 6.5 VOUT+ VOUT 0.035 +35
JA
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TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Typical Operating Characteristics
(CIN=1.0F, COUT=3.3F, TA=+25, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5
70 60 50 40 30 20 10 0
GROUND PIN CURRENT vs. AMBIENT TEMPERATURE
1mA 100mA 550mA
OUTPUT VOLTAGE (V)
2.5 2 1.5 1 0.5 0 0 1 2 3 4 5 6 7
GROUND PIN CURRENT (A)
3
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
INPUT VOLTAGE (V) *EXModel FS8856-33Cx
AMBIENT TEMPERATURE ()
DROPOUT VOLTAGE vs. LOAD CURRENT
0.8
1.40
Ron vs. LOAD CURRENT
DROPOUT VOLTAGE (V)
0.7 0.6
1.30
0.4 0.3 0.2 0.1 0.0 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6
Ron ()
0.5
1.20
1.10
1.00
0.90
0.80 100 150 200 250 300 350 400 450 500 550
LOAD CURRENT (A)
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO vs. FREQUENCY
-100
GND PIN CURRENT vs. LOAD CURRENT
62
GROUND PIN CURRENT (A)
-90 -80
60 58 56 54 52 50 48
PSRR (dB)
-70 -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000
0
1
50
100
150
200
250
300
350
400
450
500
550
FREQUENCY (KHz)
LOAD CURRENT (mA)
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TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
OUTPUT VOLTAGE vs. AMBIENT TEMPERATURE GROUND PIN CURRENT (uA)
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
GROUND PIN CURRENT vs. INPUT VOLTAGE
80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6 7
3.36
OUTPUT VOLTAGE (V)
3.34
3.32
3.3
3.28
3.26
AMBIENT TEMPERATURE ()
INPUT VOLTAGE (V)
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 LINE TRANSIENT (IOUT=550mA)
LINE TRANSIENT (IOUT=250mA) 5.0V 5.0V VIN 4.0V VIN 4.0V
VOUT
CIN 1F COUT 3.3F 50mV/div
VOUT
CIN 1F COUT 3.3F 50mV/div LOAD TRANSIENT
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7/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
100mA IOUT 0mA IOUT
250mA 100mA
VOUT
CIN 1F COUT 3.3F 50mV/div LOAD TRANSIENT
VOUT
CIN 1F COUT 3.3F 50mV/div LOAD TRANSIENT
550mA IOUT 250mA IOUT
500mA 0mA
VOUT
CIN 1F COUT 3.3F 50mV/div
VOUT
CIN 1F COUT 3.3F 100mV/div
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8/13
TD-0405008
Rev. 1.3
FS8856
550mA LDO Linear Regulator
Detail Description
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 65A (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.
Current Limit 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 = +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 FS8856 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 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
JC
- T A ) (TJ - T A ) = JA + CA
Where (TJ-TA) is the temperature difference between the FS8856 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 FS8856 uses a SOT-89 package and this package is mounted on a double sided printed
9/13 TD-0405008 Rev. 1.3
Fortune Semiconductor Co.
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TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
FS8856
550mA LDO Linear Regulator
circuit board with two square inches of copper allocated for "heat spreading", the resulting JA is 180C/W. Based on a maximum operating junction temperature 125C 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 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. 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.
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TEL : +886-2-2809-4742 FAX: +886-2-2809-4874
10/13
TD-0405008
Rev. 1.3
FS8856
550mA 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-0405008
Rev. 1.3
FS8856
550mA 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-0405008
Rev. 1.3
FS8856
550mA 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-0405008
Rev. 1.3

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