- 您现在的位置：买卖IC网 > PDF目录1832 > LTC3839EUH#PBF (Linear Technology)IC REG CTRLR BUCK PWM CM 32-QFN PDF资料下载
参数资料
| 型号： | LTC3839EUH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 41/50页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 32-QFN |
| 标准包装： | 73 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 电源电压： | 4.5 V ~ 38 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： | -40°C ~ 125°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页当前第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页
LTC3839
APPLICATIONS INFORMATION
these pins. If the IC can be placed on the bottom side
of a multilayer board, use ground planes to isolate from
the major power components on the top side of the
board, and prevent noise coupling to noise sensitive
components on the bottom side.
? Place the resistor feedback divider R FB1 , R FB2 close to
V OUTSENSE1+ and V OUTSENSE1– pins, so that the feed-
back voltage tapped from the resistor divider will not
be disturbed by noise sources. Route remote sense
PCB traces (use a pair of wires closely together for
differential sensing) directly to the terminals of output
capacitors for best output regulation.
? Place decoupling capacitors C ITH2 next to the ITH and
SGND pins with short, direct trace connections.
? Use sufficient isolation when routing a clock signal into
the MODE/PLLIN pin or out of the CLKOUT pin, so that
the clock does not couple into sensitive pins.
? Place the ceramic decoupling capacitor C INTVCC between
the INTV CC pin and SGND and as close as possible to
the IC.
? Place the ceramic decoupling capacitor C DRVCC close
to the IC, between the combined DRV CC1,2 pins and
PGND.
? Filter the V IN input to the IC with an RC filter. Place the
filter capacitor close to the V IN pin.
? If vias have to be used, use immediate vias to connect
components to the SGND and PGND planes of the IC.
Use multiple large vias for power components.
? 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 DC rails only,
e.g., PGND.
PCB Layout Debugging
Only after each controller is checked for its individual
performance should both controllers be turned on at the
same time. It is helpful to use a current probe to monitor
the current in the inductor while testing the circuit. Monitor
the output switching node (SW pin) to synchronize the
oscilloscope to the internal oscillator output CLKOUT, or
external clock if used. Probe the actual output voltage as
well. Check for proper performance over the operating
voltage and current range expected in the application.
The frequency of operation should be maintained over
the input voltage range. The phase should be maintained
from cycle to cycle in a well designed, low noise PCB
implementation. Variation in the phase of SW node pulse
can suggest noise pickup at the current or voltage sensing
inputs or inadequate loop compensation. Overcompensa-
tion of the loop can be used to tame a poor PCB layout if
regulator bandwidth optimization is not required.
Pay special attention to the region of operation when one
controller channel is turning on (right after its current
comparator trip point) while the other channel is turning
off its top MOSFET at the end of its on-time. This may
cause minor phase-lock jitter at either channel due to
noise coupling.
Reduce V IN from its nominal level to verify operation of
the regulator in dropout. Check the operation of the un-
dervoltage lockout circuit by further lowering V IN while
monitoring the outputs to verify operation.
Investigate whether any problems exist only at higher out-
put currents or only at higher input voltages. If problems
coincide with high input voltages and low output currents,
look for capacitive coupling between the BOOST, SW, TG,
and possibly BG connections and the sensitive voltage
and current pins.
3839fa
41
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3850IGN-2#TRPBF | IC REG CTRLR BUCK PWM CM 28-SSOP |
| LTC3850IGN#PBF | IC REG CTRLR BUCK PWM CM 28-SSOP |
| LTC3851EGN#PBF | IC REG CTRLR BUCK PWM CM 16-SSOP |
| LTC3851EMSE-1#PBF | IC REG CTRLR BUCK PWM CM 16-MSOP |
| LTC3852EUDD#PBF | IC REG CTRLR DOUBLER PWM 24-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3839IUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
| LTC3839IUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
| LTC3850EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP 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 |
| LTC3850EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
| LTC3850EGN-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
发布紧急采购，3分钟左右您将得到回复。