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PDF ( 数据手册 , 数据表 ) ME3101A12

零件编号 ME3101A12
描述 500mA Synchronous Step-Down DC/DC Converters
制造商 Microne
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ME3101A12 数据手册, 描述, 功能
500mA Synchronous Step-Down DC/DC Converters ME3101 Series
Ver04
500mA Synchronous Step-Down DC/DC Converters ME3101 Series
Description
ME3101 series is a group of synchronous rectification
type DC/DC converters with a built-in 0.6P-channel
driver transistor and 0.7N-channel switching transistor,
designed to allow the use of ceramic capacitors. The ICs
enable a high efficiency, stable power supply with an
output current of 500mA to be configured using only a
coil and two capacitors connected externally.
With the built-in oscillator, oscillation frequency is
1.2MHz.As for operation mode, the ME3101 series can be
manually switched with automatic PWM/PFM switching
control mode, allowing fast response, low ripple and high
efficiency over the full range of load (from light load to
high output current conditions).
During standby, all circuits are shutdown to reduce
current consumption to as low as 1.0μA or less.
Typical Application Circuit
Feature
z Synchronous Step-Down DC/DC
z High Efficiency :93%(TYP)
z Low Ripple Voltage :10mV
z Output Current :500mA
z Oscillation Frequency :1.2MHz
z PWM/PFM Automatic Switching Control
z Maximum Duty Ratio :100%
z Ceramic Capacitor Compatible
z Ultra Small Packages :SOT-23-5L
z Soft-start ciruit built-in
Typical Application:
z Mobile phones (PDC, GSM, CDMA, IMT200
etc.)
z Bluetooth equipment
z PDA
z Portable communication modem
z Portable games
z Cameras
z Digital cameras
z Cordless phones
z Notebook computers
Typical Performance Characteristics
Efficiency vs. Output Current
L=3.3uHCin4.7uFCL=10uFTopr25
0.95
0.90
0.85
0.80
0.75
0.70
VIN=4V
VIN=4.5V
VIN=5V
VIN=6V
0.65
0.60
0.55
0.50
-100 0 100 200 300 400 500 600 700
IOUT (mA)
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ME3101A12 pdf, 数据表
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500mA Synchronous Step-Down DC/DC Converters ME3101 Series
Ver04
Note On Use
1. Use Ceramic Capacitor will achieve low ripple and high efficiency.
2. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is
the possibility that some cycles may be skipped completely.
3. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted
and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.
4. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when
dropout voltage or load current is high, current limit starts operating, and this can lead to instability. When peak current
becomes high, please adjust the coil inductance value and fully check the circuit operation. In addition, please calculate the
peak current according to the following formula:
Ipk = (VIN-VOUT) * On Duty / (2* L* FOSC) + IOUT
L: Coil Inductance Value
FOSC: Oscillation Frequency
5. When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
6. Care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. Depending
on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect
of noise, the board should be laid out so that capacitors are placed as close to the chip as possible.
7. Use of the IC at voltages below the recommended voltage range may lead to instability.
8. When the IC is used in high temperature, output voltage may increase up to input voltage level at no load because of the
leak current of the driver transistor.
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