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参数资料
| 型号： | LT3845AMPFE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件页数： | 25/26页 |
| 文件大小： | 284K |
| 代理商： | LT3845AMPFE#TRPBF |
LT3845A
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TG: The TG pin is the bootstrapped gate drive for the top
N-ChannelMOSFET.Sinceveryfasthighcurrentsaredriven
from this pin, connect it to the gate of the power MOSFET
with a short and wide, typically 0.02” width, PCB trace to
minimize inductance.
VC: The VC pin is the output of the error amplifier whose
voltage corresponds to the maximum (peak) switch
current per oscillator cycle. The error amplifier is typically
configured as an integrator by connecting an RC network
from the VC pin to SGND. This circuit creates the dominant
pole for the converter regulation control loop. Specific
integrator characteristics can be configured to optimize
transientresponse.WhenBurstModeoperationisenabled
(seePin4description),aninternallowimpedanceclampon
theVCpinissetat100mVbelowtheburstthreshold,which
limits the negative excursion of the pin voltage. Therefore,
this pin cannot be pulled low with a low impedance source.
IftheVCpinmustbeexternallymanipulated,dosothrough
a 1kΩ series resistance.
VCC: The VCC pin is the internal bias supply decoupling
node. Use a low ESR, 1F or greater ceramic capacitor to
decouplethisnodetoPGND.MostinternalICfunctionsare
PIN FUNCTIONS
poweredfromthisbiassupply.Anexternaldiodeconnected
from VCC to the BOOST pin charges the bootstrapped
capacitor during the off-time of the main power switch.
Back driving the VCC pin from an external DC voltage
source, such as the VOUT output of the regulator supply,
increases overall efficiency and reduces power dissipation
in the IC. In shutdown mode this pin sinks 20A until the
pin voltage is discharged to 0V.
VFB: The output voltage feedback pin, VFB, is externally
connectedtothesupplyoutputvoltageviaaresistivedivider.
The VFB pin is internally connected to the inverting input
of the error amplifier. In regulation, VFB is 1.231V.
VIN: The VIN pin is the main supply pin and should be
decoupled to SGND with a low ESR capacitor (at least
0.1F) located close to the pin.
Exposed Pad (SGND) (TSSOP Only): The exposed
leadframe is internally connected to the SGND pin. Solder
the exposed pad to the PCB ground for electrical contact
and optimal thermal performance.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3845EFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency |
| LT3845EFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LT3845EFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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) |
| LT3845EFEPBF | 制造商:Linear Technology 功能描述:60V Current-Mode Controller Adj. TSSOP16 |
| LT3845EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency |
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