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参数资料
| 型号： | LT3845IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16TSSOP |
| 标准包装： | 95 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 电源电压： | 4 V ~ 60 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
LT3845
PIN FUNCTIONS
TG: The TG pin is the bootstrapped gate drive for the top
N-Channel MOSFET. Since very fast high currents are driven
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.
V C : The V C pin is the output of the error ampli?er whose
voltage corresponds to the maximum (peak) switch current
per oscillator cycle. The error ampli?er is typically con?g-
ured as an integrator by connecting an RC network from
the V C pin to SGND. This circuit creates the dominant pole
for the converter regulation control loop. Speci?c integra-
tor characteristics can be con?gured to optimize transient
response. When Burst Mode operation is enabled (see Pin
4 description), an internal low impedance clamp on the V C
pin is set at 100mV below the burst threshold, which limits
the negative excursion of the pin voltage. Therefore, this
pin cannot be pulled low with a low impedance source. If
the V C pin must be externally manipulated, do so through
a 1kΩ series resistance.
V CC : The V CC pin is the internal bias supply decoupling
are powered from this bias supply. An external diode con-
nected from V CC to the BOOST pin charges the bootstrapped
capacitor during the off-time of the main power switch.
Back driving the V CC pin from an external DC voltage
source, such as the V OUT output of the regulator supply,
increases overall ef?ciency and reduces power dissipation
in the IC. In shutdown mode this pin sinks 20μA until the
pin voltage is discharged to 0V.
V FB : The output voltage feedback pin, V FB , is externally
connected to the supply output voltage via a resistive divider.
The V FB pin is internally connected to the inverting input
of the error ampli?er. In regulation, V FB is 1.231V.
V IN : The V IN pin is the main supply pin and should be
decoupled to SGND with a low ESR capacitor (at least
0.1μF) located close to the pin.
Exposed Pad (SGND) (TSSOP Only): The exposed lead-
frame is internally connected to the SGND pin. Solder the
exposed pad to the PCB ground for electrical contact and
optimal thermal performance.
node. Use a low ESR, 1μF or greater ceramic capacitor to
decouple this node to PGND. Most internal IC functions
3845fd
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3845IFETRPBF | 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 |
| LT3845IFE-TRPBF | 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 |
| LT3845MPFE | 制造商:Linear Technology 功能描述:Step Down Controller 16-Pin TSSOP EP 制造商:Linear Technology 功能描述:HIGH VOLTAGE SYNCHRONOUSCURRENT MODE STEP-DOWNCONTROLLER WITH ADJUSTABLEOPERATING FREQUENCY |
| LT3845MPFE#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:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LT3845MPFE#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN CONTROLLER 16-TSSOP |
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