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EM1101 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 EM1101
기능 LDO Regulator
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EM1101 데이터시트, 핀배열, 회로
EM1101
300mA High PSRR Low Noise, Adjustable LDO Regulator
General Description
The EM1101 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 EM1101 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 EM1101 is
available in SOT-23-5 package.
Ordering Information
Part Number
EM1101J
Package
SOT-23-5L
Remark
Applications
Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Applications
Pin Configuration
FB VOUT
54
1 23
EN GND VIN
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
Typical Application Circuit
2011/09/19
Rev.A.5
1




EM1101 pdf, 반도체, 판매, 대치품
Typical Operating Characteristics
Power On from VIN
VIN
VOUT
IOUT
VOUT=3.3VCIN=COUT=1uFROUT=15
Turn On from EN
VEN
VOUT
IOUT
VOUT=3.3VCIN=COUT=1uFROUT=15
Load Transient Response
VOUT
IOUT
VOUT=3.3VCIN=COUT=1uF
EM1101
Power Off from VIN
VIN
VOUT
IOUT
VOUT=3.3VCIN=COUT=1uFROUT=15
Turn Off from EN
VEN
VOUT
IOUT
VOUT=3.3VCIN=COUT=1uFROUT=15
Line Transient Response
VIN
VOUT
VOUT=2.5VCIN=COUT=1uFVIN=3.5V to 4.5V.
2011/09/19
Rev.A.5
4

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EM1101 전자부품, 판매, 대치품
EM1101
Functional Description
Enable Function
EM1101 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 EM1101 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 2.0V.
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
VOUT Voltage Adjustment
The VOUT voltage of EM1101 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
EM1101 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 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 EM1101, the
2011/09/19
Rev.A.5
7

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