RT2875D 반도체 회로 부품 판매점
Synchronous Step-Down Converter
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 Richtek |
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RT2875D
3A, 36V, Synchronous Step-Down Converter
General Description
The RT2875D is a high efficiency, current-mode
synchronous DC/DC step-down converter that can deliver
up to 3A output current over a wide input voltage range
from 4.5V to 36V. The device integrates 95mΩ high-side
and 70mΩ low-side MOSFETs to achieve high conversion
efficiency. The current-mode control architecture supports
fast transient response and simple external compensation.
A cycle-by-cycle current limit function provides protection
against shorted output and an external soft-start eliminates
input current surge during start-up. The RT2875D provides
complete protection functions such as input under-voltage
lockout, output under-voltage protection, over-current
protection and thermal shutdown.
The RT2875D is available in the thermal enhanced TSSOP-
14 (Exposed Pad) package.
Features
3A Output Current
Internal N-MOSFETs
Current Mode Control
Adjustable Switching Frequency : 300kHz to 2.1MHz
Adjustable Current Limit : 1.5A to 6A
Synchronous to External Clock : 300kHz to 2.1MHz
Adjustable Output Voltage from 0.6V to 24V
High Efficiency Up to 95%
Stable with Low ESR Ceramic Output Capacitors
Cycle-by-Cycle Current Limit
Input Under-Voltage Lockout
Output Under-Voltage Protection
0.6V ± 1% Reference Voltage Over Temperature
Thermal Shutdown
AEC-Q100 Grade 2 Qualified
RoHS Compliant and Halogen Free
Pin Configurations
(TOP VIEW)
SW
SW
PGND
RT/SYNC
AGND
RLIM
FB
14
2 13
3 12
4 PGND 11
5 10
6 15 9
78
BOOT
VIN
VIN
PGOOD
EN
SS
COMP
TSSOP-14 (Exposed Pad)
Applications
Point of Load Regulator in Distributed Power Systems
Digital Set Top Boxes
Broadband Communications
Vehicle Electronics
Simplified Application Circuit
VIN
Enable
PGOOD
CIN
RLIM ROSC
VIN BOOT
RT2875D
SW
EN
PGOOD
RLIM
FB
RT/SYNC COMP
SS
AGND PGND
CBOOT L
RCOMP CCOMP
CSS
VOUT
R1
COUT
R2
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS2875D-00 October 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
RT2875D
Ordering Information
RT2875D
Package Type
CP: TSSOP-14 (Exposed Pad)
Lead Plating System
G : Green (Halogen Free and Pb Free)
DQ : Hiccup Mode UVP
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
RT2875DQ
GCPYMDNN
RT2875DQGCP : Product Number
YMDNN : Date Code
Functional Pin Description
Pin No.
Pin Name
Pin Function
1, 2 SW
Switch Node. Connect to external L-C filter.
3,
15 (Exposed Pad)
PGND
4 RT/SYNC
5 AGND
Power Ground. The exposed pad must be soldered to a large PCB and
connected to PGND for maximum power dissipation.
Oscillator Resistor and External Frequency Synchronization Input. Must connect
a resistor from this pin to GND to set the switching frequency. If SYNC clock is
requested, connect an external clock to change the switching frequency.
Analog Ground.
6
RLIM
Current Limit Setting. Connect a resistor from this pin to GND to set the current
limit value.
7 FB
Feedback Voltage Input. The pin is used to set the output voltage of the
converter to regulate to the desired via a resistive divider. Feedback reference =
0.6V.
Compensation Node. COMP is used to compensate the regulation control loop.
8
COMP
Connect a series RC network from COMP to GND. In some cases, an additional
capacitor from COMP to GND is required.
9
SS
Soft-Start Time Setting. Connect a capacitor from SS to GND to set the
soft-start period.
10 EN
Enable Control Input. High = Enable.
11 PGOOD Power Good Indicator Output.
12, 13
14
VIN
BOOT
Power Input. Support 4.5V to 36V input voltage. Must bypass with a suitable
large ceramic capacitor at this pin.
Bootstrap Supply for High-Side Gate Driver. Connect a 0.1F ceramic capacitor
between the BOOT and SW pins.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2875D-00 October 2015
|
PDF 파일 내의 페이지 : 총 16 페이지
제조업체: Richtek
( richtek )
RT2875D converter
데이터시트 다운로드 :
[ RT2875D.PDF ]
[ RT2875D 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
관련 데이터시트
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