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부품번호 FAN2535 기능
기능 (FAN2534 / FAN2535) 150 mA CMOS LDO Regulator
제조업체 Fairchild Semiconductor
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FAN2535 데이터시트, 핀배열, 회로
www.DataSheet4U.com
www.fairchildsemi.com
FAN2534/FAN2535
150 mA CMOS LDO Regulator with Fast Start, Enable
Features
• 70dB Ripple rejection ( >45dB up to 1MHz)
• 150µsec Power On Time
• 150µsec Enable Time
• Low noise - 50µVrms
• Enable optimized for CDMA time slices
• 180 mV dropout voltage at 150 mA
• Enable/Shutdown Control
• Enable time independent of noise bypass capacitor value
• SOT23-5 package
• Thermal limiting
• 300 mA trimmed current limit
Applications
• Cellular Phones and accessories
• PDAs
• Portable cameras and video recorders
• Laptop, notebook and palmtop computers
Description
The FAN2534/FAN2535 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 computers,
and other portable devices. Proprietary design technics
ensure high ripple rejection. Other features include low
noise, short circuit current limit, thermal shutdown circuit,
low dropout voltage, fast enable required in CDMA handset
applications, exceptional loop stability to accommodate a
wide variety of external capacitors, and a compact SOT23-5
surface-mount package. These products offer significant
improvements over older Bipolar and CMOS designs and are
pin-compatible with many popular devices.
The FAN2534 and FAN2535 devices are distinguished by
the assignment of pin 4:
FAN2534: pin 4 – ADJ, allowing the user to adjust the
output voltage over a wide range using an external voltage
divider.
FAN2534-XX: pin 4 – BYP, to which a bypass capacitor
may be connected for optimal noise performance. Output
voltage is fixed, as specified by the suffix XX.
FAN2535-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 2.6V, 2.85V,
and 3.0V . Custom output voltages are also available: please
contact your local Fairchild Sales Office for information.
Block Diagrams
VIN
Bandgap
FAN2534
EN
Error
p
Amplifier
VOUT
Thermal
Sense
ADJ
GND
VIN
Bandgap
EN
Error
Amplifier
p
Thermal
Sense
FAN2534-XX
BYP
VIN
Bandgap
VOUT
EN
Error
Amplifier
p
ERR
VOUT
GND
Thermal
Sense
FAN2535-XX
GND
REV. 1.0.2 8/26/03




FAN2535 pdf, 반도체, 판매, 대치품
FAN2534/FAN2535
www.DataSheet4U.com
Switching Characteristics (Notes 4, 5)
Parameter
Enable Response time (Note 8)
Power "ON" Response time
Error Flag Response time
(FAN2535-XX only)
Conditions
CL=10µF CBP=10nF
CL=10uF CBP=10nF
VOUT = 3.0V
PRODUCT SPECIFICATION
Min.
Typ.
150
150
Max.
300
500
3
Unit
µsec
µsec
msec
AC Performance Characteristics (Notes 4, 5)
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
VOUT/
VIN
VOUT/
VOUT
eN
PSRR
Line regulation
Load regulation
Output noise
Power Supply
Ripple Rejection
VIN = (VOUT + 1) to 6.5V, IL = 10mA
IOUT = 0.1 to 100mA
BW: 300Hz–50KHz
COUT = 10µF,
CBYP = 0.01µF
100 Hz,
COUT = 1µF,
CBYP = 0.01µF
0mA<IL<150mA
0.05
1.0
50
0.2 % / V
2.0 %
µVRMS
70 dB
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. Using Mil Std. 883E, method 3015.7(Human Body Model), 400V when using JEDEC method A115-A (Machine Model).
3. For specific output voltages of the fixed oputput voltage versions please refer to the table: "Output Voltage Options and
Ordering Information" on Page 9. Custom fixed output voltages, not listed in the table, are also available.
4. Unless otherwise stated, TA = 25°C, VIN = VOUT + 1V, IOUT = 100µA, VEH > 2.0 V.
5. Bold values indicate -40 <TJ <125°C.
6. Dropout Voltage is defined as the input to output differential at which the output voltage drops to 2% below the nominal value
measured at 1V input - output differential.
7. Adjustable version, has a bandgap reference voltage of 1.0V, trimmed to +/-1% initial accuracy.
8. When using repeated cycling, F>0.5Hz.
4 REV. 1.0.2 8/26/03

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FAN2535 전자부품, 판매, 대치품
PRODUCT SPECIFICATION
www.DataSheet4U.com
General PWB Layout Considerations
For optimum device performance, careful circuit layout and
grounding technics must be used. Establishing a small local
ground, to which the GND pin, and 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 optimum performance, especially
during high load conditions. A large copper area in the local
ground serves as heat sink (as discussed above) when high
power dissipation significantly increases device temperature.
Component-side copper provides significantly better thermal
performance. Added feedthrough connecting the device side
ground plane to the back plane further reduces thermal
resistance.
FAN2534/FAN2535
REV. 1.0.2 8/26/03
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부품번호상세설명 및 기능제조사
FAN2534

(FAN2534 / FAN2535) 150 mA CMOS LDO Regulator

Fairchild Semiconductor
Fairchild Semiconductor
FAN2535

(FAN2534 / FAN2535) 150 mA CMOS LDO Regulator

Fairchild Semiconductor
Fairchild Semiconductor

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