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FAN2501 데이터시트 PDF




Fairchild Semiconductor에서 제조한 전자 부품 FAN2501은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 FAN2501 기능
기능 100 mA CMOS LDO Regulators
제조업체 Fairchild Semiconductor
로고 Fairchild Semiconductor 로고


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FAN2501 데이터시트, 핀배열, 회로
FAN2500, FAN2501
100 mA CMOS LDO Regulators
www.fairchildsemi.com
Features
• Ultra Low Power Consumption
• 100 mV dropout voltage at 100 mA
• 25 µA ground current at 100 mA
• Enable/Shutdown Control
• SOT23-5 package
• Thermal limiting
• 300 mA peak current
Applications
• Cellular Phones and accessories
• PDAs
• Portable cameras and video recorders
• Laptop, notebook and palmtop computers
Description
The FAN2500/01 family of micropower low-dropout voltage
regulators utilize CMOS technology to offer a new level of
cost-effective performance in GSM and TDMA 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
Block Diagrams
VIN
Bandgap
EN
Error
Amplifier
p
VOUT
ADJ
FAN2500
Thermal
Sense
GND
VIN
Bandgap
wide variety of external capacitors, and the compact SOT23-5
surface-mount package. The FAN2500/01 family of products
offer significant improvements over older BiCMOS designs
and are pin-compatible with many popular devices. The
output is thermally protected against overload.
The FAN2500 and FAN2501 devices are distinguished by
the assignment of pin 4:
FAN2500: pin 4 – ADJ, allowing the user to adjust the
output voltage over a wide range using an external voltage
divider.
FAN2500-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.
FAN2501-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.
VIN
Bandgap
EN
Error
Amplifier
p
BYP
VOUT
FAN2500-XX
EN
Error
Amplifier
p
Thermal
Sense
ERR
VOUT
GND
FAN2501-XX
Thermal
Sense
GND
REV. 1.0.6 2/14/03




FAN2501 pdf, 반도체, 판매, 대치품
PRODUCT SPECIFICATION
FAN2500/FAN2501
Thermal Characteristics
The FAN2500/01 is designed to supply 100mA 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 characteris-
tics 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-to-
output voltage differential and the output current plus the
ground current multiplied by the input voltage, or:
PD = (VIN – VOUT)IOUT + VINIGND
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:
PD(max)
=
T----J---(-m----θa---xJ---A)---–----T----A--
where TJ(max) is the maximum allowable junction tempera-
ture of the die, which is 125°C, and TA is the ambient operat-
ing 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 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 FAN2500/01 includes an input
pin ADJ which allows the user to select an output voltage
ranging from 1.8V 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:
VOUT = 1.32V ×
1 + -R----u--p---p---e--r
Rlower
The total value of the resistor chain should not exceed
250Ktotal 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. Establish-
ing 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 high-
frequency 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 condi-
tions. 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.
4 REV. 1.0.6 2/14/03

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FAN2501 전자부품, 판매, 대치품
FAN2500/FAN2501
Typical Performance Characteristics
Power Supply
Rejection Ratio
100
IOUT = 100µA
80 COUT = 1.0µF Cer.
60
Power Supply
Rejection Ratio
100
VIN = 4.0V IOUT = 10mA
80 VOUT = 3.0V COUT = 1.0µF Cer.
60
40 40
20 VIN = 4.0V
VOUT = 3.0V
0
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
20
0
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Power Supply
Rejection Ratio
100
VIN = 4.0V
80 VOUT = 3.0V
60
40
20 IOUT = 100µA
COUT = 10µF Cer.
0
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Power Supply
Rejection Ratio
100
VIN = 4.0V
80 VOUT = 3.0V
IOUT = 10mA
60 COUT = 10µF Cer.
40
20
0
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Power Supply
Rejection Ratio vs. Voltage Drop
70
60
IOUT = 100µA
50
10mA
40
30 COUT = 1.0µF Cer.
20 100mA
10
03.0
3.6 4.1
Voltage (V)
25.00
23.00
21.00
Ground Pin Current
VIN = 4V
VOUT = 3V
19.00
17.00
15.00
0.1
1 10 100
Load Current (mA)
REV. 1.0.6 2/14/03
Power Supply
Rejection Ratio vs. Voltage Drop
70
60
IOUT = 100µA
50
40
30 10mA
20
10 100mA COUT = 10µF Cer.
03.0
3.6 4.1
Voltage (V)
Ground Pin Current
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
3.0
VOUT = 3V
IOUT = 100µA
4.0 5.0 6.0
Input Voltage (V)
7.0
PRODUCT SPECIFICATION
Power Supply
Rejection Ratio
100
VIN = 4.0V IOUT = 100mA
80 VOUT = 3.0V COUT = 1.0µF Cer.
60
40
20
0
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Power Supply
Rejection Ratio
100
IOUT = 100mA
80 COUT = 10µF Cer.
VIN = 4.0V
60 VOUT = 3.0V
40
20
0
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Noise Performance
10
1 VIN = 4.0V
VOUT = 3.0V
0.1
0.01
0.001
COUT = 1.0µF
CI LB=YP10=µ0A.01µF
0.0001
10 100 1k 10k
100k
Frequency (Hz)
1M
Ground Pin Current
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
3.0
VOUT = 3V
IOUT = 100mA
4.0 5.0 6.0
Input Voltage (V)
7.0
7

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