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부품번호 | EM1105 기능 |
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기능 | LDO Regulator | ||
제조업체 | Excelliance MOS | ||
로고 | |||
전체 8 페이지수
EM1105
300mA, High PSRR, Low Noise, Adjustable LDO Regulator
General Description
The EM1105 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 EM1105 has wide adjustable output voltage
range and high feedback voltage accuracy to 1.5%.
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 EM1105 is
available in SOT-23-5 package.
Ordering Information
Part Number
EM1105J
Package
SOT-23-5L
Remark
Features
Ultra Fast Response in Line/Load Transient
Wide VIN Range from 2.5V to 5.5V
Adjustable Output Voltage from 0.8V to 4.5V
Ultra Low Dropout Voltage: 200mV @300mA
High Power Supply Rejection Ratio
70dB at 1kHz
60dB 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 FB
54
1 23
VIN GND EN
Typical Application Circuit
2011/09/19
Rev.A.2
1
Typical Operating Characteristics
Power On from VIN
VIN
VOUT
IOUT
VOUT=3.3V,CIN=COUT=1uF,ROUT=15Ω
Turn On from EN
VEN
VOUT
IOUT
VOUT=3.3V,CIN=COUT=1uF,ROUT=15Ω
Load Transient Response
VOUT
IOUT
VIN=4.3V,VOUT=3.3V,CIN=COUT=1uF
EM1105
Power Off from VIN
VIN
VOUT
IOUT
VOUT=3.3V,CIN=COUT=1uF,ROUT=15Ω
Turn Off from EN
VEN
VOUT
IOUT
VOUT=3.3V,CIN=COUT=1uF,ROUT=15Ω
Line Transient Response
VIN
VOUT
VOUT=2.5V,CIN=COUT=1uF,IOUT=1mA.
2011/09/19
Rev.A.2
4
4페이지 EM1105
Functional Description
Enable Function
EM1105 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.
POR – Power ON Reset
To let EM1105 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.
VOUT Voltage Adjustment
The VOUT voltage of EM1105 can be adjusted by
external voltage divider. Refer to typical
application circuit, VOUT voltage is calculated by
the following equation,
VOUT
=
(1 +
R1 ) × 0.8V
R2
Over Current Limit Function
EM1105 features over current limiting function
which can limit its output current to 600mA.
Power Dissipation
The max power depends on some conditions,
including of thermal impedance, PCB layout,
airflow, and so on. The max power dissipation can
be calculated by the formula as below
PD(max)=(TJ(max)-TA) / θJA
TJ(max) is the max 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 EM1105, the
max junction temperature is 125 degree C. The θJA
of SOT23-5 is 250°C/W on the standard JEDEC 51-3
thermal test board. The max power dissipation (at
25°C ambient) can be calculated as below:
PD(max at 25°C)=(125°C – 25°C) / (250°C/W) = 0.4W
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.
2011/09/19
Rev.A.2
7
7페이지 | |||
구 성 | 총 8 페이지수 | ||
다운로드 | [ EM1105.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
EM1101 | LDO Regulator | Excelliance MOS |
EM1103 | LDO Regulator | Excelliance MOS |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |