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参数资料
| 型号： | LTC3805MPMSE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 3/20页 |
| 文件大小： | 248K |
| 代理商： | LTC3805MPMSE#TRPBF |
LTC3805
11
3805ff
APPLICATIONS INFORMATION
Many LTC3805 application circuits can be derived from
the topology shown on the first page of this data sheet
and from the topology shown in Figure 2.
TheLTC3805itselfimposesnolimitsonallowedinputvolt-
age VIN or output voltage VOUT. These are all determined
by the ratings of the external power components. The
factors are: Q1 maximum drain-source voltage (BVDSS),
on-resistance (RDS(ON)) and maximum drain current, T1
saturation flux level and winding insulation breakdown
voltages,CINandCOUTmaximumworkingvoltage,equiva-
lent series resistance (ESR), and maximum ripple current
ratings, and D1 and RSENSE power ratings.
VCC Bias Power
The VCC pin must be bypassed to the GND pin with a
minimum 1F ceramic or tantalum capacitor located im-
mediatelyadjacenttothetwopins.Propersupplybypassing
is necessary to supply the high transient currents required
by the MOSFET gate driver.
For maximum flexibility, the LTC3805 is designed so that it
can be operated from voltages well beyond the LTC3805’s
absolute maximum ratings. Figure 2 shows the simplest
case, in which the LTC3805 is powered with a resistor
RVCC connected between the input voltage and VCC. The
built-in shunt regulator limits the voltage on the VCC pin
to around 9.5V as long as the internal shunt regulator is
not forced to sink more than 25mA. This powering scheme
has the drawback that the power loss in the resistor re-
duces converter efficiency and the 25mA shunt regulator
maximum may limit the maximum-to-minimum range of
input voltage.
In some cases, the input or output voltage is within the
operational range of VCC for the LTC3805. In this case,
the LTC3805 is operated directly from either the input or
output voltage. Figure 3 shows a 5V output converter in
which RSTART and CVCC form a start-up trickle charger
while D2 powers VCC from the output once the converter
is in normal operation. Note that RSTART need only supply
the very small 40A micropower start-up current while
Figure 3. Powering the LTC3805 from the Output
LTC3805
ITH
GND
SSFLT
RUN
GATE
OC
ISENSE
SYNC
FS
FB
VCC
RFS
118k
RSLOPE
3k
RSENSE
68m
CIN
2.2F
× 2
CVCC
22F
ROC
1.33k
Q1
SEC
PRI
D2
R2
8.66k
R1
221k
RSTART
100k
VIN
36V TO 72V
VOUT
5V AT 2A
RITH
20k
CITH
470pF
CSS
0.1F
R4
13.7k
R3
71.5k
COUT
100F
× 2
3805 F02
Figure 2. Powering the LTC3805 via the
Internal Shunt Regulator
LTC3805
VCC
RVCC
CVCC
3805 F02
VIN
GND
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| LTC3806EDE#PBF | 功能描述:IC REG CTRLR FLYBACK PWM 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) |
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