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PDF SE5509 Data sheet ( Hoja de datos )
| Número de pieza | SE5509 | |
| Descripción | 300mA Low Power Low Noise LDO CMOS Voltage Regulator | |
| Fabricantes | Seaward Electronics | |
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300mA Low Power Low Noise
LDO CMOS Voltage Regulator
SE5509
Description
The SE5509 series of fixed output low dropout
linear regulators are designed for portable battery
powered applications, which require low power
consumption, low noise environment, and low
dropout voltage. Each device contains a bandgap
voltage reference, an error amplifier, a PMOS
power transistor, and resistors for setting output
voltage, and current limit and temperature limit
protection circuits.
The SE5509 has been designed to be used
with low cost capacitors and requires a minimum
output capacitor of 1.0μF. The output voltages
range from 1.3V to 4.4V in 100mV increments.
Standard voltage versions are 1.5, 1.8, 2.5, 2.8, 3.0,
and 3.3V.
Pin Configuration
Features
¾ Typical 200mV Dropout Voltage at 150mA.
¾ Fast Enable Turn-On Time of 20μs (Typ.)
¾ Excellent Line and Load Regulation.
¾ High Accuracy Output Voltage of 2%.
¾ Ultra-Low Ground Current at 20μA (Typ.)
¾ Disable Current Less than 0.1μA (Typ.)
¾ Over Current and thermal Protection.
¾ No Reverse Current.
¾ Standard SOT-23-5L and TSOP-5 Package.
Application
¾ USB removable devices
¾ MPEG4 devices
¾ Wireless LAN’s
¾ Hand-Held Instrumentation.
¾ Portable DVD players
¾ Digital camera
Ordering Information
SE5509 _ _ _
www.DataSheet4U.com
Pin (1=>5):
G: VIN/GND/EN/BYPASS/VOUT
Block Diagram
Package:
L: SOT-23-5L / TSOP-5
Output Voltage: A: VOUT = 3.3V
B: VOUT = 2.8V
C: VOUT = 2.5V
D: VOUT = 1.8V
E: VOUT = 1.5V
F: VOUT = 3.0V
Revision 12/5/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2006. • www.seawardinc.com.cn • Page 1
1 page  
300mA Low Power Low Noise
LDO CMOS Voltage Regulator
SE5509
Application Hints
Like any low dropout regulator, SE5509 requires
external capacitors to ensure stability. The
external capacitors must be carefully selected to
ensure performance.
Input Capacitor
An input capacitor of at least 1μF is required.
Ceramic or Tantalum can be used. The value can
be increase without upper limit.
Output Capacitor
An output capacitor is required for stability. It must
be placed no more than 1 cm away from the VOUT
pin, and connected directly between VOUT and GND
pins. Electrolytical capacitor is recommended. The
minimum value is 1μF but may be increase without
limit. Ceramic can be used. But the value should not
be more than 2.2μF.
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded. The SE5509 has built-in thermal
protection. When the thermal limit is exceeded,
the IC will enter protection, and VOUT will be pulled
to ground. The power dissipation for a given
application can be calculated as following:
The power dissipation (PD) is
PD = IOUT * [VIN – VOUT]
The thermal limit of the package is then limited to
PD(MAX) = [TJ – TA]/ΘJA where TJ is the junction
temperature, TA is the ambient temperature, and
ΘJA is around 230°C/W for SE5509. SE5509 is
designed to enter thermal protection at 150°C. For
example, if TA is 25°C then the maximum PD is
limited to about 0.6W. In other words, if IOUT(MAX) =
300mA, then [VIN – VOUT] cannot exceed 2V.
Application Diagram
www.DataSheet4U.com
Revision 12/5/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2006. • www.seawardinc.com.cn • Page 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SE5509.PDF ] | |
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