参数资料
型号: LTC3852EUDD#PBF
厂商: Linear Technology
文件页数: 27/32页
文件大小: 0K
描述: IC REG CTRLR DOUBLER PWM 24-QFN
标准包装: 73
PWM 型: 电流模式
输出数: 1
频率 - 最大: 810kHz
占空比: 99%
电源电压: 2.7 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 ~ 125°C
封装/外壳: 24-WFQFN 裸露焊盘
包装: 管件
LTC3852
APPLICATIONS INFORMATION
V PULL-UP
R PGOOD
PGOOD
V IN1
+
R FREQ
C FLTR
OFF ON
RUN
SHDN
MODE/PLLIN
TG
M1
+
C IN2
C SS
FREQ/PLLFLTR
SW
R C
C C1
TRACK/SS
I TH
BOOST
V IN2
D1
V IN
R A
C C2
V FB
LTC3852
INTV CC
V PUMP
D B
C INTVCC
C B
M2
C FF
R B
C S
SENSE –
GND1, 2
BG
C +
R S1
R S2
SENSE +
C –
C FLY
L1
V OUT
R SENSE
Figure 13. LTC3852 Switching Regulator Layout Diagram
C OUT1
C OUT2
3852 F13
+
ground. The 47pF to 100pF capacitor should be as
close as possible to the LTC3852. Be careful locating
the feedback resistors too far away from the LTC3852.
The V FB line should not be routed close to any other
nodes with high slew rates.
3. Are the SENSE – and SENSE + leads routed together
with minimum PC trace spacing? The ?lter capacitor
between SENSE + and SENSE – should be as close as
possible to the LTC3852. Ensure accurate current
sensing with Kelvin connections as shown in Figure 14.
Series resistance can be added to the SENSE lines to
increase noise rejection and to compensate for the ESL
nodes, especially from the voltage and current sensing
feedback pins. All of these nodes have very large and
fast moving signals and therefore should be kept on
the “output side” of the LTC3852 and occupy minimum
PC trace area.
HIGH CURRENT PATH
3852 F14
CURRENT SENSE
of R SENSE .
4. Does the (+) terminal of C IN connect to the drain of
the topside MOSFET(s) as closely as possible? This
capacitor provides the AC current to the MOSFET(s).
SENSE + SENSE –
Figure 14. Kelvin Sensing R SENSE
RESISTOR
(R SENSE )
5. Is the INTV CC ceramic decoupling capacitor connected
closely between INTV CC and GND2? This capacitor
carries the MOSFET driver peak currents.
6. Keep the switching node (SW), top gate node (TG) and
boost node (BOOST) away from sensitive small-signal
Layout Considerations (Charge Pump)
Due to the high switching frequency and high transient
currents produced by the charge pump, careful board layout
is necessary for optimum performance. A true ground
plane and short connections to all the external capacitors
3852f
27
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LTC3852IUDD#PBF 功能描述:IC REG CTRLR DOUBLER PWM 24-QFN 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)
LTC3852IUDD#TRPBF 功能描述:IC REG CTRLR DOUBLER PWM 24-QFN 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)
LTC3853EUJ#PBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR
LTC3853EUJ#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR
LTC3853EUJPBF 制造商:Linear Technology 功能描述:DC-DC Controller Triple Buck 24V QFN40