参数资料
型号: LTC3615EFE-1#TRPBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, PDSO24
封装: 4.40 MM, LEAD FREE, PLASTIC, TSSOP-24
文件页数: 19/32页
文件大小: 585K
代理商: LTC3615EFE-1#TRPBF
LTC3615/LTC3615-1
26
3615fa
Decoupling the PVIN with two 47μF capacitors is adequate
for most applications.
Finally, it is possible to dene the soft-start up time
choosing the proper value for the capacitor and the resistor
connected to TRACK/SS pin. If one sets minimum TSS =
5ms and a resistor of 4.7M, the following equation can
be solved with the maximum SVIN = 5.5V:
C
ms
MIn
V
VV
nF
SS =
=
5
47
55
06
92
.
.– .
.
The standard value of 10nF and 4.7M guarantees the
minimum soft-start time of 5ms. In Figure 3, channel 1
shows the schematic for this design example.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3615:
1. A ground plane is recommended. If a ground plane
layer is not used, the signal and power grounds should be
segregated with all small signal components returning to
the SGND pin at one point which is then connected to the
PGND node at the exposed pad close to the LTC3615
2. Connect the (+) terminal of the input capacitors, CIN, as
close as possible to the PVINx pins, and the (–) terminal
as close as possible to the exposed pad PGND. This
capacitor provides the AC current into the internal
power MOSFETs.
3. Keep the switching nodes, SWx, away from all sensitive
small signal nodes FBx, ITHx, RTSYNC, SRLIM.
4. Flood all unused areas on all layers with copper. Flooding
with copper will reduce the temperature rise of power
components. Connect the copper areas to PGND
(exposed pad) for best performance.
5. Connect the VFBx pins directly to the feedback resistors.
The resistor divider must be connected between VOUTx
and SGND.
APPLICATIONS INFORMATION
DDR Memory Termination
FB1
MODE
LTC3615
3615 TA03a
SGND PGND
RUN1
TRACK/SS1
ITH1
PHASE
RUN2
TRACK/SS2
PGOOD2
ITH2
PGOOD1
RT /SYNC
SRLIM
VIN
3.3V
SVIN
CIN1
47μF
CIN2
47μF
CIN3
1μF
L1
0.47μH
COUT1
47μF
VDDQ
1.8V/3A
R1
121k
R2
60.4k
R7
15k
C4
1000pF
R10
15k
C2
1000pF
R3
150k
R4
49.9k
FB2
L2
0.47μH
COUT2
47μF
R5
49.9k
R6
49.9k
C1
10pF
C3
10pF
R9
226k
R8
174k
VTT
0.9V
3A/–1.5A
(2 ) SW1
(2 ) PVIN1 (2 ) PVIN2
(2 ) SW2
Ratiometric Start-Up
3615 TA03b
500mV/
DIV
500μs/DIV
VDD
VTT
TYPICAL APPLICATIONS
相关PDF资料
PDF描述
LTC3615IUF-1#PBF SWITCHING REGULATOR, PQCC24
LTC3615EUF#PBF SWITCHING REGULATOR, PQCC24
LTC3615EFE#PBF SWITCHING REGULATOR, PDSO24
LTC3615IFE-1#PBF SWITCHING REGULATOR, PDSO24
LTC3615EUF#TRPBF SWITCHING REGULATOR, PQCC24
相关代理商/技术参数
参数描述
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LTC3615EUF#TRPBF 功能描述:IC REG BUCK SYNC ADJ 3A DL 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压(升压) 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型,TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT
LTC3615EUF-1#PBF 功能描述:IC REG BUCK SYNC ADJ 3A DL 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON(1.45x1) 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2
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LTC3615EUFPBF 制造商:Linear Technology 功能描述:Dual 4MHz 3A Synch Step-Down DC/DC QFN24