参数资料
型号: LTC3854EMSE#TRPBF
厂商: Linear Technology
文件页数: 18/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 12-MSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 440kHz
占空比: 98%
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 12-TSSOP (0.118",3.00mm 宽)裸露焊盘
包装: 带卷 (TR)
LTC3854
APPLICATIONS INFORMATION
sudden step change in output voltage if the load switch
resistance is low and it is driven quickly. If the ratio of
C LOAD to C OUT is greater than 1:50, the switch rise time
should be controlled so that the load rise time is limited
to approximately 25 ? C LOAD . Thus a 10μF capacitor would
require a 250μs rise time, limiting the charging current
to about 200mA.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3854. These items are also illustrated graphically
in the layout diagram of Figure 4. Check the following in
your layout:
1) Are the signal and power grounds segregated? The
LTC3854 GND pin should tie to the ground plane close
to the output capacitor(s). The low current or signal
ground trace should make a single point connection
directly to the GND pin. The synchronous MOSFET
source pins should connect to the input capacitor(s)
ground.
2) Does the V FB pin connect directly to the feedback resis-
tors? The resistive divider R1, R2 must be connected
between the (+) plate of C OUT and signal ground. The
47pF to 100pF capacitor should be as close as possible
to the LTC3854. Be careful locating the feedback resis-
tors too far away from the LTC3854. The V FB line should
not be routed close to any other nodes with high slew
rates.
+
SW
6
LTC3854
TG
5
M1
C IN
R C
47pF
C SS
C C
C C2
3
2
1
RUN/SS
ITH
V FB
BOOST
V IN
INTV CC
4
10
9
D B
C B
D1
V IN
11
1000pF
12
SENSE –
SENSE +
BG
GND
8
7
+
4.7μF
M2
L1
R1
R2
C OUT
R SENSE
3854 F04
V OUT
+
Figure 4. LTC3854 Layout Diagram
3854fb
18
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相关代理商/技术参数
参数描述
LTC3854IDDB#PBF 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Cut Tape Small Footprint, Low Pin Count Synchronous Step-Do
LTC3854IDDB#TRMPBF 功能描述:IC REG CTRLR BUCK PWM CM 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3854IDDB#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3854IMSE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3854IMSE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)