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EM1103 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 EM1103
기능 LDO Regulator
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EM1103 데이터시트, 핀배열, 회로
EM1103
300mA, High PSRR, Low Noise LDO Regulator
General Description
The EM1103 performs ultra low drop voltage, high
power supply rejection ratio (PSRR), fast response,
low noise linear regulator, and designed to
continuously deliver up to 300mA output current.
The EM1103 offers a range of 1.5V to 4.5V fixed
output, and high output accuracy to 2%.
No by-pass capacitor is needed for this device
and only 1uF ceramic capacitor is required for
stability in any loading conditions. It reduces the
amount of board space necessary for power
applications.
The other features include soft start, current
limit protection, Power-On-Reset function, and
over temperature protection. The EM1103 is
available in SOT-23-5 package.
Ordering Information
Part Number
EM1103J-XXX
Features
Package
SOT-23-5L
XXX : output Voltage
150 : 1.5V
160 : 1.6V
:
:
450 : 4.5V
185 : 1.85V
285 : 2.85V
Remark
Ultra Fast Response in Line/Load Transient
Wide VIN Range from 2.5V to 5.5V
Custom Voltage Available
Ultra Low Dropout Voltage: 200mV @300mA
High Power Supply Rejection Ratio
70dB at 1kHz
55dB at 10kHz
Ultra Low Output Noise Voltage 100uV(RMS)
Low Shutdown Current < 1uA
Only 1uF Ceramic Capacitor required for
stability
Over Temperature Protection
Current Limit Protection
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Applications
Pin Configuration
VOUT
5
NC
4
1 23
Typical Application Circuit
EN
VIN
C1
1uF
3 EN
1 VIN
VOUT 5
NC 4
GND 2
VOUT
C2
1uF
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EM1103 pdf, 반도체, 판매, 대치품
Typical Operating Characteristics
EM1103J-285
Power On from VIN
VIN
VOUT
IOUT
EM1103
EM1103J-285
Power Off from VIN
VIN
VOUT
IOUT
CIN=COUT=1uFROUT=10
EM1103J-285
VEN
Turn On from EN
VOUT
IOUT
CIN=COUT=1uFROUT=10
Load Transient Response
EM1103J-285
VOUT
IOUT
CIN=COUT=1uFROUT=10
Turn Off from EN
EM1103J-285
VEN
VOUT
IOUT
CIN=COUT=1uFROUT=10
Line Transient Response
EM1103J-285
VIN
VOUT
CIN=COUT=1uF
CIN=COUT=1uFIOUT=1mA.
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EM1103 전자부품, 판매, 대치품
EM1103
Functional Description
Enable Function
EM1103 is enabled if the voltage of the EN pin is
greater than 1.4V. If the voltage of the EN pin is
less than 0.38V, the IC will be disabled.
PD(max at 25°C)=(125°C – 25°C) / (250°C/W) = 0.4W
POR – Power ON Reset
To let EM1103 start to operation, input voltage
must be higher than its POR voltage even when EN
voltage is pulled higher than enable high voltage.
Typical POR voltage is 2.1V.
Over Current Limit Function
EM1103 features over current limiting function
which can limit its output current to 600mA.
Input and Output Capacitor Selection
For VIN pin, 1uF or larger ceramic capacitor is
required to provide bypass path in transient
current demand. VOUT pin is also recommended to
have 1uF or larger ceramic capacitor to be stable
and reduce the VOUT voltage dip when fast loading
transient is happened.
Power Dissipation
The maximum power depends on some conditions,
including of thermal impedance, PCB layout,
airflow, and so on. The maximum power
dissipation can be calculated by the formula as
below
PD(max)=(TJ(max)-TA) / θJA
TJ(max) is the maximum junction temperature; θJA is
the thermal impedance from junction to ambient.
The thermal impedance θJA of SOT23-5 is package
design and PCB design dependent.
For recommended specification of EM1103, the
maximum junction temperature is 125°C. The θJA of
SOT23-5 is 250°C/W on the standard JEDEC 51-3
thermal test board. The maximum power
dissipation (at 25°C ambient) can be calculated as
below:
2011/9/19
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