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PDF SE5508 Data sheet ( Hoja de datos )
| Número de pieza | SE5508 | |
| Descripción | 150mA CMOS Low Noise LDO Voltage Regulator | |
| Fabricantes | Seaward Electronics | |
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150mA CMOS Low Noise
LDO Voltage Regulator
(Preliminary)
SE5508
Description
The SE5508 series of fixed output low dropout
linear regulators are designed for portable battery
powered applications, which require low noise
environment, fast enable response time, and low
dropout voltage. An optional bypass capacitor can
be added for better low-noise performance. Each
device contains a voltage reference unit, an error
amplifier, a PMOS power transistor, and resistors
for setting output voltage, and current limit and
temperature limit protection circuits.
The SE5508 has been designed to be used with low
cost capacitors and requires a minimum output
capacitor of 1.0μF. Standard voltage versions are
1.5, 1.8, 2.5, 2.8, 3.0, and 3.3V.
Pin Configuration
Features
¾ Excellent Noise Rejection at 62 dB.
¾ Typical Low Dropout Voltage of 200mV at
75mA.
¾ Fast Enable Turn-On Time of 20μs (Typ.)
¾ Excellent Line and Load Regulation.
¾ High Accuracy Output Voltage of 2%.
¾ Typical Low Ground Current at 50μA
¾ Typical Disable Current Less than 0.1μA
¾ Thermal Protection.
¾ Standard SOT23-5L and SC70 (SOT353)
Package.
¾ Available in Lead-Free Packages.
Applications
¾ Cellphones.
¾ Wireless LAN’s.
¾ Hand-Held Instrumentation.
¾ Portable Video Game Devices.
¾ Digital Cameras.
Ordering Information
SE5508 _ _ _
www.DataSheet4U.com
Pin (1=>5):
G: VIN/GND/EN/BYPASS/VOUT
Package: L: SOT-23-5L
P: SC70 (SOT353)
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
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 1
1 page  
150mA CMOS Low Noise
LDO Voltage Regulator
(Preliminary)
SE5508
Application Hints
Like any low dropout regulator, SE5508 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. The minimum value is 1μF but may be
increase without limit.
Application Diagram
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded. The SE5508 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 SE5508. SE5508 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) =
150mA, then [VIN – VOUT] cannot exceed 3.6V.
Block Diagram
www.DataSheet4U.com
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SE5508.PDF ] | |
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