FAIRCHILD FAN2512

www.fairchildsemi.com
FAN2512, FAN2513
150 mA CMOS LDO Regulators with Fast Start Enable
Features
•
•
•
•
•
•
•
•
wide variety of external capacitors, and the compact SOT23-5
surface-mount package. In addition, the FAN2512/13 family
offer the fast power-cycle time required in CDMA handset
applications. These products offer significant improvements
over older BiCMOS designs and are pin-compatible with
many popular devices. The output is thermally protected
against overload.
Ultra Low Power Consumption
Enable optimized for CDMA time phases
150 mV dropout voltage at 150 mA
25 µA ground current at 150 mA
Enable/Shutdown Control
SOT23-5 package
Thermal limiting
300 mA peak current
The FAN2512 and FAN2513 devices are distinguished by
the assignment of pin 4:
Applications
•
•
•
•
FAN2512: pin 4 – ADJ, allowing the user to adjust the
output voltage over a wide range using an external voltage
divider.
Cellular Phones and accessories
PDAs
Portable cameras and video recorders
Laptop, notebook and palmtop computers
FAN2512-XX: pin 4 – BYP, to which a bypass capacitor
may be connected for optimal noise performance. Output
voltage is fixed, indicated by the suffix XX.
Description
The FAN2512/13 family of micropower low-dropout voltage
regulators utilize CMOS technology to offer a new level of
cost-effective performance in GSM, TDMA, and CDMA
cellular handsets, Laptop and Notebook portable computers,
and other portable devices. Features include extremely low
power consumption and low shutdown current, low dropout
voltage, exceptional loop stability able to accommodate a
FAN2513-XX: pin 4 – ERR, a flag which indicates that the
output voltage has dropped below the specified minimum
due to a fault condition.
The standard fixed output voltages available are 2.5V, 2.6V,
2.7V, 2.8V, 2.85V, 3.0V, and 3.3V. Custom output voltage are
also available: please contact your local Fairchild Sales
Office for information.
Block Diagrams
EN
EN
VIN
VIN
Bandgap
Error
Amplifier
BYP
Bandgap
p
VOUT
Error
Amplifier
p
VOUT
ADJ
Thermal
Sense
Thermal
Sense
GND
FAN2512
GND
FAN2512-XX
EN
VIN
ERR
Bandgap
Error
Amplifier
p
VOUT
Thermal
Sense
GND
FAN2513-XX
REV. 1.1.9 12/17/10
PRODUCT SPECIFICATION
FAN2512/FAN2513
Pin Assignments
VIN
1
GND
2
EN
3
5
VOUT
4
ADJ/BYP/ERR
Pin No.
FAN2512
FAN2512-XX
FAN2513-XX
1.
VIN
VIN
VIN
2.
GND
GND
GND
3.
EN
EN
EN
4.
ADJ
BYP
ERR
5.
VOUT
VOUT
VOUT
Pin Descriptions
Pin Name
Pin No.
Type
Pin Function Description
ADJ
4
Input
FAN2512 Adjust. Ratio of potential divider from VOUT to ADJ
determines output voltage.
BYP
4
Passive
FAN2512-XX Bypass. Connect 470 pF capacitor for noise reduction.
ERR
4
Open drain
FAN2513-XX Error. Error flag output.
0: Output voltage < 95% of nominal.
1: Output voltage > 95% of nominal.
EN
3
Digital Input
Enable.
0: Shutdown VOUT.
1: Enable VOUT.
VIN
1
Power in
Voltage Input. Supply voltage input.
VOUT
5
Power out
Voltage Output. Regulated output voltage.
GND
2
Power
Ground.
Functional Description
Designed utilizing CMOS process technology, the
FAN2512/13 family of products are carefully optimized for
use in compact battery-powered devices, offering a unique
combination of low power consumption, extremely low
dropout voltages, high tolerance for a variety of output
capacitors, and the ability to disable the output to less than
1µA under user control. In the circuit, a difference amplifier
controls the current through a series-pass P-Channel
MOSFET, comparing the load voltage at the output with an
onboard low-drift bandgap reference. The series resistance
of the pass P-Channel MOSFET is approximately 1Ω, resulting in an unusually low dropout voltage under load when
compared to older bipolar pass-transistor designs.
2
Protection circuitry is provided onboard for overload conditions. In conditions where the device reaches temperatures
exceeding the specified maximums, an onboard circuit shuts
down the output, where it remains suspended until it has
cooled before re-enabling. The user is also free to shut down
the device using the Enable control pin at any time.
Careful design of the output regulator amplifier assures loop
stability over a wide range of ESR values in the external
output capacitor. A wide range of values and types can be
accommodated, allowing the user to select a capacitor
meeting his space, cost, and performance requirements,
and enjoy reliable operation over temperature, load, and
tolerance variations.
REV. 1.1.9 12/17/10
FAN2512/FAN2513
An Enable pin, available on all devices, allows the user to
shut down the regulator output to conserve power, reducing
supply current to less than 1µA. The output can then be
re-Enabled within 500µSec, fulfilling the fast power-cycling
needs of CDMA applications. Depending on the model
selected, other control and status functions are available at
pin 4 to enhance the operation of the device. The adjustablevoltage versions utilize pin 4 to connect to an external
voltage divider which feeds back to the regulator error
amplifier, thereby setting the voltage as desired. Two other
functions are available in the fixed-voltage versions: in
noise-sensitive applications, an external Bypass capacitor
connection is provided that allows the user to achieve optimal noise performance at the output, while the Error output
functions as a diagnostic flag to indicate that the output
voltage has dropped more than 5% below the nominal fixed
voltage.
Applications Information
PRODUCT SPECIFICATION
more. Tantalum or aluminum electrolytic, or multilayer
ceramic types can all be used. A nominal value of at least
1µF is recommended.
Bypass Capacitor (FAN2512 Only)
In the fixed-voltage configuration, connecting a capacitor
between the bypass pin and ground can significantly reduce
noise on the output. Values ranging from 470pF to 10nF can
be used, depending on the sensitivity to output noise in the
application.
At the high-impedance Bypass pin, care must be taken in the
circuit layout to minimize noise pickup, and capacitors must
be selected to minimize current loading (leakage). Noise
pickup from external sources can be considerable. Leakage
currents into the Bypass pin will directly affect regulator
accuracy and should be kept as low as possible; thus, highquality ceramic and film types are recommended for their
low leakage characteristics. Cost-sensitive applications not
concerned with noise can omit this capacitor.
External Capacitors – Selection
The FAN2512/13 allows the user to utilize a wide variety of
capacitors compared to other LDO products. An innovative
design approach offers significantly reduced sensitivity to
ESR (Effective Series Resistance), which degrades regulator
loop stability in older designs. While the improvements featured in the FAN2512/13 family greatly simplify the design
task, capacitor quality still must be considered if the designer
is to achieve optimal circuit performance. In general,
ceramic capacitors offer superior ESR performance, at a
lower cost and a smaller case size than tantalums. Those with
X7R or Y5Vdielectric offer the best temperature coefficient
characteristics. The combination of tolerance and variation
over temperature in some capacitor types can result in significant variations, resulting in unstable performance over rated
conditions.
Input Capacitor
An input capacitor of 2.2µF (nominal value) or greater,
connected between the Input pin and Ground, located in
close proximity to the device, will improve transient
response and noise rejection. Higher values will offer superior input ripple rejection and transient response. An input
capacitor is recommended when the input source, either a
battery or a regulated AC voltage, is located far from the
device. Any good quality ceramic, tantalum, or metal film
capacitor will give acceptable performance, however tantalum capacitors with a surge current rating appropriate to the
application must be selected to avoid catastrophic failure.
Output Capacitor
An output capacitor is required to maintain regulator loop
stability. Unlike many other LDO regulators, the FAN2512/13
family of products are nearly insensitive to output capacitor
ESR. Stable operation will be achieved with a wide variety
of capacitors with ESR values ranging from 10mΩ to 10Ω or
REV. 1.1.9 12/17/10
Control Functions
Enable Pin
Applying a voltage of 0.4V or less at the Enable pin will disable the output, reducing the quiescent output current to less
than 1µA, while a voltage of 2.0V or greater will enable the
device. If this shutdown function is not needed, the pin can
simply be connected to the VIN pin. Allowing this pin to float
will cause erratic operation.
Error Flag (FAN2513 Only)
To indicate conditions such as input voltage dropout
(low VIN), overheating, or overloading (excessive output
current), the ERR pin indicates a fault condition. It is an
open-drain output which is HIGH when the voltage at VOUT
is greater than 95% of the nominal rated output voltage and
LOW when VOUT is less than 95% or the rated output voltage, as specified in the error trip level characteristics.
A logic pullup resistor of 100KΩ is recommended at this
output. The pin can be left disconnected if unused.
Thermal Protection
The FAN2512/13 is designed to supply high peak output
currents of up to 1A for brief periods, however this output
load will cause the device temperature to increase and
exceed maximum ratings due to power dissipation. During
output overload conditions, when the die temperature
exceeds the shutdown limit temperature of 150°C, onboard
thermal protection will disable the output until the temperature drops below this limit, at which point the output is then
re-enabled. During a thermal shutdown situation the user
may assert the power-down function at the Enable pin,
reducing power consumption to the minimum level IGND.
3
PRODUCT SPECIFICATION
Thermal Characteristics
The FAN2512/13 is designed to supply 150mA at the specified output voltage with an operating die (junction) temperature of up to 125°C. Once the power dissipation and thermal
resistance is known, the maximum junction temperature of
the device can be calculated. While the power dissipation is
calculated from known electrical parameters, the thermal
resistance is a result of the thermal characteristics of the
compact SOT23-5 surface-mount package and the surrounding PC Board copper to which it is mounted.
The power dissipation is equal to the product of the input-tooutput voltage differential and the output current plus the
ground current multiplied by the input voltage, or:
P D = ( V IN – V OUT )I OUT + V IN I GND
The ground pin current IGND can be found in the charts
provided in the Electrical Characteristics section.
The relationship describing the thermal behavior of the
package is:
 T J ( max ) – T A 
P D ( max ) =  ------------------------------- 
θ JA


where TJ(max) is the maximum allowable junction temperature of the die, which is 125°C, and TA is the ambient operating temperature. θJA is dependent on the surrounding PC
board layout and can be empirically obtained. While the θJC
(junction-to-case) of the SOT23-5 package is specified at
130°C /W, the θJA of the minimum PWB footprint will be at
least 235°C /W. This can be improved upon by providing a
heat sink of surrounding copper ground on the PWB.
Depending on the size of the copper area, the resulting θJA
can range from approximately 180°C /W for one square inch
to nearly 130°C /W for 4 square inches. The addition of
backside copper with through-holes, stiffeners, and other
enhancements can also aid in reducing this value. The heat
contributed by the dissipation of other devices located
nearby must be included in design considerations.
Once the limiting parameters in these two relationships have
been determined, the design can be modified to ensure that
the device remains within specified operating conditions. If
overload conditions are not considered, it is possible for the
4
FAN2512/FAN2513
device to enter a thermal cycling loop, in which the circuit
enters a shutdown condition, cools, re-enables, and then
again overheats and shuts down repeatedly due to an
unmanaged fault condition.
Operation of Adjustable Version
The adjustable version of the FAN2512/13 includes an input
pin ADJ which allows the user to select an output voltage
ranging from 1.32V to near VIN, using an external resistor
divider. The voltage VADJ presented to the ADJ pin is fed to
the onboard error amplifier which adjusts the output voltage
until VADJ is equal to the onboard bandgap reference voltage
of 1.32V(typ). The equation is:
R upper
V OUT = 1.32V × 1 + ---------------R lower
The total value of the resistor chain should not exceed
250KΩ total to keep the error amplifier biased during
no-load conditions. Programming output voltages very near
VIN need to allow for the magnitude and variation of the
dropout voltage VDO over load, supply, and temperature
variations. Note that the low-leakage FET input to the
CMOS Error Amplifier induces no bias current error to the
calculation.
General PWB Layout Considerations
To achieve the full performance of the device, careful circuit
layout and grounding technique must be observed. Establishing a small local ground, to which the GND pin, the output
and bypass capacitors are connected, is recommended, while
the input capacitor should be grounded to the main ground
plane. The quiet local ground is then routed back to the main
ground plane using feedthrough vias. In general, the highfrequency compensation components (input, bypass, and
output capacitors) should be located as close to the device as
possible. The proximity of the output capacitor is especially
important to achieve optimal noise compensation from the
onboard error amplifier, especially during high load conditions. A large copper area in the local ground will provide the
heat sinking discussed above when high power dissipation
significantly increases the temperature of the device.
Component-side copper provides significantly better thermal
performance for this surface-mount device, compared to that
obtained when using only copper planes on the underside.
REV. 1.1.9 12/17/10
FAN2512/FAN2513
PRODUCT SPECIFICATION
Absolute Maximum Ratings (beyond which the device may be damaged)1
Parameter
Min
Typ
Max
Unit
0
7
V
0
7
V
0
7
V
Power Supply Voltages
VIN (Measured to GND)
Enable Input (EN)
Applied voltage (Measured to GND)2
ERR Output
Applied voltage (Measured to GND)2
Power
Dissipation3
Internally limited
Temperature
Junction
-65
Lead Soldering (5 seconds)
Storage
-65
4
Electrostatic Discharge
150
°C
260
°C
150
°C
4
kV
Notes:
1. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only
if Operating Conditions are not exceeded.
2. Applied voltage must be current limited to specified range.
3. Based upon thermally limited junction temperature:
T J ( max ) – T A
P D = ------------------------------Θ JA
4. Human Body Model is 4kV minimum using Mil Std. 883E, method 3015.7. Machine Model is 400V minimum using JEDEC
method A115-A.
Recommended Operating Conditions
Parameter
Min
Nom
Max
Units
VIN
Input Voltage Range
2.7
6.5
V
Vref
VIN–VDO
V
0
VIN
V
VIN
V
+125
°C
VO
Output Voltage Range, Adjustable
VEN
Enable Input Voltage
VERR
ERR Flag Voltage
TJ
Junction Temperature
θJA
Thermal resistance
220
°C/W
θJC
Thermal resistance
130
°C/W
REV. 1.1.9 12/17/10
-40
5
PRODUCT SPECIFICATION
FAN2512/FAN2513
Electrical Characteristics (Notes 1, 2)
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
IOUT = 100 µA
2.5
4
mV
IOUT = 50 mA
50
75
mV
IOUT = 100 mA
100
140
mV
IOUT = 150 mA
150
180
mV
2
%
1.32
1.40
V
6
%
50
µA
1
µA
Regulator
VDO
Drop Out Voltage
∆VO
Output Voltage Accuracy
VDO
Reference Voltage Accuracy, Adjustable Mode
∆VO
3
-2
1.24
Output Voltage Accuracy, Adjustable Mode
IGND
Ground Pin Current
-6
IOUT = 150 mA
Protection
Current Limit
Thermally Protected
IGSD
Shut-Down Current
TSH
Thermal Protection Shutdown Temperature
EN = 0V
ETL
ERR Trip Level
150
FAN2513 only
90
°C
95
99
%
1.2
0.4
V
Enable Input
VIL
Logic Low Voltage
VIH
Logic High Voltage
IIH
Input Current High
1
µA
II
Input Current Low
1
µA
2.0
1.4
V
Switching Characteristics (Notes 1, 2)
Parameter
Enable
Conditions
Min.
Typ.
Max.
Unit
500
µsec
3
msec
Input4
Response time
Error Flag (FAN2513-XX)
Response time
Performance Characteristics (Notes 1, 2)
Symbol
Parameter
Conditions
∆VOUT/∆VIN
Line regulation
VIN = (VOUT + 1) to 6.5V
0.3
∆VOUT/VOUT
Load regulation
IOUT = 0.1 to 150mA
1.0
eN
Output noise
10Hz–1KHz
COUT = 10µF,
CBYP = 0.01µF
<7
>10KHz,
COUT = 10µF,
CBYP = 0.01µF
<0.01
120 Hz,
COUT = 10µF,
CBYP = 0.01µF
43
PSRR
Power Supply Rejection
Min.
Typ.
Max.
Units
% /V
2.0
%
µV/ Hz
dB
Notes:
1. Unless otherwise stated, TA = 25°C, VIN = VOUT + 1V, IOUT = 100µA, VIH > 2.0 V.
2. Bold values indicate -40 ≤ TJ ≤ 125°C.
3. The adjustable version, has a bandgap voltage range of 1.24V to 1.40V with a nominal value of 1.32V.
4. When using repeated cycling.
6
REV. 1.1.9 12/17/10
FAN2512/FAN2513
PRODUCT SPECIFICATION
Typical Performance Characteristics
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
100
IOUT = 10mA
80 COUT = 1.0µF Cer.
60
40
VIN = 4.0V
VOUT = 3.0V
20
0
10
100
VIN = 4.0V
VOUT = 3.0V
60
40
0
10
1k 10k 100k 1M 10M
Frequency (Hz)
100
60
40
0
10
100
0
10
1k 10k 100k 1M 10M
Frequency (Hz)
100
VIN = 4.0V
VOUT = 3.0V
40
60
60
PSRR (dB)
60
40
100
VIN = 4.0V
VOUT = 3.0V
40
IOUT = 100µA
50
10mA
40
30
COUT = 1.0µF Cer.
100mA
20
20
20
0
10
100
0
10
1k 10k 100k 1M 10M
Frequency (Hz)
Power Supply
Rejection Ratio vs. Voltage Drop
IOUT = 10mA
1k 10k 100k 1M 10M
Frequency (Hz)
100µA
30
100mA
20
COUT = 10µF Cer.
10
150mA
3.0
3.6
Voltage (V)
REV. 1.1.9 12/17/10
150mA
3.0
VIN = 4V
VOUT = 3V
0.01
4.1
0.0001
10
4.1
Voltage (V)
Ground Pin Current
0.1
0.001
3.6
30.00
1
40
0
100
Quiescent Current (µA)
50
0
Noise Performance
Noise (µV/ Hz)
PSRR (dB)
60
10
10
70
1k 10k 100k 1M 10M
Frequency (Hz)
70
IOUT = 150mA
80 COUT = 10µF Cer.
CBYP = 0.01µF
PSRR (dB)
IOUT = 100mA
COUT = 10µF Cer.
CBYP = 0.01µF
80
VIN = 4.0V
VOUT = 3.0V
Power Supply
Rejection Ratio vs. Voltage Drop
100
100
60
0
10
1k 10k 100k 1M 10M
Frequency (Hz)
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
IOUT = 10mA
COUT = 10µF Cer.
CBYP = 0.01µF
20
VIN = 4.0V
VOUT = 3.0V
20
20
80
PSRR (dB)
PSRR (dB)
40
1k 10k 100k 1M 10M
Frequency (Hz)
Power Supply
Rejection Ratio
IOUT = 100µA
80 COUT = 10µF Cer.
CBYP = 0.01µF
VIN = 4.0V
VOUT = 3.0V
60
100
100
100
IOUT = 150mA
80 COUT = 1.0µF Cer.
40
0
10
1k 10k 100k 1M 10M
Frequency (Hz)
Power Supply
Rejection Ratio
100
VIN = 4.0V
VOUT = 3.0V
60
20
20
Power Supply
Rejection Ratio
PSRR (dB)
IOUT = 100mA
80 COUT = 1.0µF Cer.
PSRR (dB)
PSRR (dB)
PSRR (dB)
IOUT = 100µA
80 COUT = 1.0µF Cer.
PSRR (dB)
Power Supply
Rejection Ratio
100
100
COUT = 1.0µF
CBYP = 0.01µF
I L = 10µA
100
1k
10k 100k
Frequency (Hz)
1M
28.00
VIN = 4V
VOUT = 3V
26.00
24.00
22.00
20.00
0.1
10
1
Load Current (mA)
100
7
PRODUCT SPECIFICATION
FAN2512/FAN2513
Typical Performance Characteristics (continued)
Ground Pin Current
30.00
30.00
25.00
20.00
15.00
10.00
VOUT = 3V
IOUT = 100µA
5.00
0.00
3.0
4.0
5.0
6.0
Input Voltage (V)
Ground Pin Current
75
Quiescent Current (µA)
35.00
Quiescent Current (µA)
Quiescent Current (µA)
Ground Pin Current
35.00
25.00
20.00
15.00
10.00
VOUT = 3V
IOUT = 150mA
5.00
0.00
3.0
7.0
4.0
5.0
6.0
VIN = 4V
VOUT = 3V
IL = 100µA
50
25
0
-40
7.0
0
Input Voltage (V)
40
80
Temperature (°C)
125
Dropout Characteristics
3.5
Ground Pin Current
Dropout Voltage
VOUT = 3V
VIN = 4V
VOUT = 3V
IL = 150mA
25
0
-40
0
40
80
Temperature (°C)
90.00
60.00
30.00
0.00
0.1
125
1.0
0.5
25
50
75
0.0
0.0
100 125 150
4
IL = 100µA
0
40
80
Temperature (°C)
125
100
0
-40
5.0
4.0
3.05
150
50
3.0
Output Voltage
vs. Temperature
Output Voltage (V)
Dropout Voltage (mV)
6
2.0
1.0
Input Voltage (V)
200
0
-40
ROUT = 20Ω
1.5
Dropout Voltage
8
2
ROUT = 30KΩ
2.0
Output Current (mA)
Dropout Voltage
Dropout Voltage (mV)
2.5
120.00
Output Voltage (V)
50
3.0
150.00
Dropout Voltage (mV)
Quiescent Current (µA)
75
IL = 150mA
0
40
80
Temperature (°C)
3
2.95
2.85
-40
125
VIN = 4V
Typical 3V device
IL = 100µA
2.9
0
40
80
Temperature (°C)
125
Functional Characteristics
Shutdown Delay
Disable Voltage
(1V/div)
Enable Voltage
(1V/div)
Enable Pin Delay
Enable
Disable
Output Voltage
(1V/div)
Output Voltage
(1V/div)
VOUT
Time (20µs/div)
8
VOUT
Time (20µs/div)
REV. 1.1.9 12/17/10
FAN2512/FAN2513
PRODUCT SPECIFICATION
Mechanical Dimensions
5-Lead SOT-23-5 (S) Package
Inches
Symbol
Millimeters
Min.
Max.
Min.
Max.
A
A1
B
c
D
.035
.000
.008
.003
.106
.057
.006
1.45
.15
.020
.010
.122
.90
.00
.20
.08
2.70
E
e
e1
H
L
α
.059
.071
1.50
1.80
.037 BSC
.075 BSC
.087
.126
.004
.024
0°
10°
Notes:
Notes
1. Package outline exclusive of mold flash & metal burr.
2. Package outline exclusive of solder plating.
3. EIAJ Ref Number SC-74A.
.50
.25
3.10
.95 BSC
1.90 BSC
2.20
3.20
.10
.60
0°
10°
e
B
L
E
H
e1
c
D
A
A1
REV. 1.1.9 12/17/10
9
PRODUCT SPECIFICATION
FAN2512/FAN2513
Ordering Information
Product Number
FAN2512S33X
VOUT
Pin 4 Function
Package Marking
3.3
Bypass
AJE3
Tape and Reel Information
Quantity
Reel Size
Width
3000
7"
8mm
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ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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