EUP3475DIR1 반도체 회로 부품 판매점
1MHz Synchronous Step-Down Converter
|
|
 Eutech Microelectronics |
EUP3475
3A, 28V, 1MHz Synchronous
Step-Down Converter
DESCRIPTION
The EUP3475 is a 1MHz fixed frequency
synchronous current mode buck regulator. The device
integrates both 135mΩ high-side switch and 90mΩ
low-side switch that provide 3A of continuous load
current over a wide operating input voltage of 4.5V to
28V.The internal synchronous power switch increases
efficiency and eliminates the need for an external
Schottky diode. Current mode control provides fast
transient response and cycle-by-cycle current limit.
The EUP3475 features short circuit and thermal
protection circuits to increase system reliability.
Externally programmable soft-start allows for proper
power on sequencing with respect to other power
supllies and avoids input inrush current during startup.
In shutdown mode, the supply current drops below
1µA. The EUP3475 is available in SOP-8 package
with the exposed pad.
FEATURES
3A Continuous Output Current
110ns Minimum On Time
Integrated 135mΩ High Side Switch
Integrated 90mΩ Low Side Switch
Wide 4.5V to 28V Operating Input Range
Output Adjustable from 0.8V to 24V
Up to 95% Efficiency
Programmable Soft-Start
<1µA Shutdown Current
1MHz Fixed Switching Frequency
Thermal Shutdown and Over Current Protection
Input Under Voltage Lockout
Available in SOP-8 (EP) package
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
Typical Application Circuit
APPLICATIONS
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
DS3475 Ver 1.6 May 2012
Figure 1.
1
Pin Configurations
Package Type
EUP3475Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Pin Configurations
SOP-8 (EP)
Pin Description
Number
1
Pin Name
BS
2 IN
3
4
9 (Exposed Pad)
5
SW
GND
FB
6 COMP
7 EN
8 SS
Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side
N-Channel DMOS switch. Connect a 0.01µF or greater capacitor from SW to BS
to power the high side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter
switches. Drive IN with a 4.5V to 28V power source. Bypass IN to GND with a
suitably large capacitor to eliminate noise on the input to the IC. See Input
Capacitor.
Power Switching Output. SW is the switching node that supplies power to the
output. Connect the output LC filter from SW to the output load. Note that a
capacitor is required from SW to BS to power the high-side switch.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Feedback Input. FB senses the output voltage and regulates it. Drive FB with a
resistive voltage divider connected to it from the output voltage. The feedback
threshold is 0.8V. See Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND. In some cases, an additional
capacitor from COMP to GND is required. See Compensation Components.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN
high to turn on the regulator; low to turn it off. Connect to IN with a 100K pull
up resistor for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor
from SS to GND to set the external soft-start period, or leave SS floating to set
the internal soft-start period. A 0.1µF capacitor sets the soft-start period to about
15ms. Leave SS pin floating, and the internal soft-start period is about 300µs.
DS3475 Ver 1.6 May 2012
2
|
PDF 파일 내의 페이지 : 총 11 페이지
제조업체: Eutech Microelectronics
( eutech )
EUP3475DIR1 converter
데이터시트 다운로드 :
[ EUP3475DIR1.PDF ]
[ EUP3475DIR1 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
