参数资料
型号: IRU3146CFTR
厂商: International Rectifier
文件页数: 1/30页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 28TSSOP
标准包装: 1
PWM 型: 电压模式
输出数: 2
频率 - 最大: 345kHz
占空比: 85%
电源电压: 4.5 V ~ 16 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 28-TSSOP(0.173",4.40mm 宽)
包装: 剪切带 (CT)
产品目录页面: 1384 (CN2011-ZH PDF)
其它名称: *IRU3146CFTR
IRU3146CFCT
NOT RECOMMENDED FOR NEW DESIGN
Design Recommendation
IR3621
Data Sheet No.PD 94702 revA
IRU3146
DUAL SYNCHRONOUS PWM CONTROLLER WITH
CURRENT SHARING CIRCUITRY AND AUTO-RESTART
FEATURES
Dual Synchronous Controller with 180 out-of-phase
Configurable to 2-Independent Outputs or 2-Phase
Single Output
Current Sharing Using Inductor's DCR
Current Limit using MOSFET's R DS(ON)
Hiccup/Latched Current Limit
Latched Over-Voltage Protection
Vcc from 4.5V to 16V Input
Programmable Switching Frequency up to 500KHz
Two Independent Soft-Starts/ Shutdowns
0.8V Precision Reference Voltage Available
Power Good Output
External Frequency Synchronization
APPLICATIONS
Embedded Computer Systems
Telecom Systems
Point of Load Power Architectures
DESCRIPTION
The IRU3146 IC combines a Dual synchronous Buck
controller, providing a cost-effective, high performance
and flexible solution. The IRU3146 can configured as 2-
independent or as 2-phase controller. The 2-phase con-
figuration is ideal for high current applications. The
IRU3146 features 180 out of phase operation which re-
duces the required input/output capacitance and results
to few number of capacitor quantity. Other key features
offered by this device include two independent program-
mable soft starts, programmable switching frequency up
to 500KHz per phase, under voltage lockout function.
The current limit is provided by sensing the lower
MOSFET's on-resistance for optimum cost and perfor-
mance.
2-Phase Power Suppl y
Graphic Card
DDR Memory Applications
D1
C12
12V
C11
C3
C4
V CL VcH1 V OUT3 VcH2
C13
C14
C5
Vcc
HDrv1
OCSet1
R1
Q2
L3
LDrv1
PGnd1
IRU3146
Comp1
R2
C8
C9
R3
R4
Hiccup
Sync
V REF
Comp2
Rt U1
V P2
V SEN1
V SEN2
Fb1
Fb2
HDrv2
OCSet2
R6
Q3
D2
BAT54A
C17
Q4
R5
R9
L4
C15
C18
R10
R11
R7
R8
1.8V @ 30A
C16
PGood
C10
PGood
SS1 / SD
SS2 / SD
LDrv2
PGnd2
Gnd
Q5
Figure 1 - Typical application of IRU3146 in 2-phase configuration with inductor current sensing
PACKAGE ORDER INFORMATION
DEVICE
IRU3146CF
PACKAGE
28-Pin TSSOP (F)
Rev. 1.1
6/25/04
www.irf.com
1
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