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MT3608 の電気的特性と機能

MT3608のメーカーはAEROSEMIです、この部品の機能は「High Efficiency 1.2MHz 2A Step Up Converter」です。


製品の詳細 ( Datasheet PDF )

部品番号 MT3608
部品説明 High Efficiency 1.2MHz 2A Step Up Converter
メーカ AEROSEMI
ロゴ AEROSEMI ロゴ 




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MT3608 Datasheet, MT3608 PDF,ピン配置, 機能
AEROSEMI
FEATURES
• Integrated 80mΩ Power MOSFET
• 2V to 24V Input Voltage
• 1.2MHz Fixed Switching Frequency
• Internal 4A Switch Current Limit
• Adjustable Output Voltage
• Internal Compensation
• Up to 28V Output Voltage
• Automatic Pulse Frequency Modulation
Mode at Light Loads
• up to 97% Efficiency
• Available in a 6-Pin SOT23-6 Package
APPLICATIONS
• Battery-Powered Equipment
• Set-Top Boxed
• LCD Bais Supply
• DSL and Cable Modems and Routers
• Networking cards powered from PCI
or PCI express slots
MT3608
High Efficiency 1.2MHz
2A Step Up Converter
GENERAL DESCRIPTION
The MT3608 is a constant frequency, 6-pin SOT23
current mode step-up converter intended for small,
low power applications. The MT3608 switches at
1.2MHz and allows the use of tiny, low cost
capacitors and inductors 2mm or less in height.
Internal soft-start results in small inrush current and
extends battery life.
The MT3608 features automatic shifting to pulse
frequency modulation mode at light loads. The
MT3608 includes under-voltage lockout, current
limiting, and thermal overload protection to prevent
damage in the event of an output overload. The
MT3608 is available in a small 6-pin SOT-23
package.
TYPICAL APPLICATION
Efficiency
Figure 1. Basic Application Circuit
Aerosemi Technology Co., Ltd
Iout (mA)
Figure 2. Efficiency Curve
1

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MT3608 pdf, ピン配列
ELECTRICAL CHARACTERISTICS
MT3608
(VIN=VEN=5V, TA = 25°C, unless otherwise noted.)
Parameter
Conditions
MIN TYP MAX unit
Operating Input Voltage
2 24 V
Under Voltage Lockout
1.98 V
Under Voltage Lockout Hysteresis
100 mV
Current (Shutdown)
Quiescent Current (PFM)
Quiescent Current (PWM)
Switching Frequency
VEN= 0V
VFB=0.7VNo switch
VFB=0.5Vswitch
0.1 1 µA
100 200 µA
1.6 2.2 mA
1.2 MHz
Maximum Duty Cycle
EN Input High Voltage
VFB = 0V
90
1.5
%
V
EN Input Low Voltage
0.4 V
FB Voltage
0.588 0.6 0.612
V
FB Input Bias Current
VFB = 0.6V
-50 -10
nA
SW On Resistance (1)
80 150 mΩ
SW Current Limit (1)
VIN= 5V, Duty cycle=50%
4
A
SW Leakage
VSW = 20V
1 μA
Thermal Shutdown
155
Note:
1) Guaranteed by design, not tested.
Aerosemi Technology Co., Ltd
3


3Pages


MT3608 電子部品, 半導体
APPLICATION INFORMATION
MT3608
Setting the Output Voltage
The internal reference VREF is 0.6V (Typical).The
output voltage is divided by a resistor divider,R1 and
R2 to the FB pin. The output voltage is given by
VOUT
= VREF
× (1 +
R1 )
R2
Inductor Selection
The recommended values of inductor are 4.7 to
22μH. Small size and better efficiency are the major
concerns for portable device, such as MT3608 used
for mobile phone. The inductor should have low core
loss at 1.2MHz and low DCR for better efficiency. To
avoid inductor saturation current rating should be
considered.
Capacitor Selection
Input and output ceramic capacitors of 22μF are
recommended for MT3608 applications. For better
voltage filtering, ceramic capacitors with low ESR
are recommended. X5R and X7R types are suitable
because of their wider voltage and temperature
ranges.
Layout Consideration
For best performance of the MT3608, the following
guidelines must be strictly followed.
Input and Output capacitors should be placed
close to the IC and connected to ground plane
to reduce noise coupling.
The GND should be connected to a strong
ground plane for heat sinking and noise
protection.
Keep the main current traces as possible as
short and wide.
SW node of DC-DC converter is with high
frequency voltage swing. It should be kept at a
small area.
Place the feedback components as close as
possible to the IC and keep away from the
noisy devices.
Diode Selection
Schottky diode is a good choice for MT3608
because of its low forward voltage drop and fast
reverses recovery. Using Schottky diode can get
better efficiency. The high speed rectification is also
a good characteristic of Schottky diode for high
switching frequency. Current rating of the diode must
meet the root mean square of the peak current and
output average current multiplication as following :
I D (RMS) I OUT × I PEAK
The diodes reverse breakdown voltage should be
larger than the output voltage.
Aerosemi Technology Co., Ltd
6

6 Page



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部品番号部品説明メーカ
MT3608

High Efficiency 1.2MHz 2A Step Up Converter

AEROSEMI
AEROSEMI


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