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参数资料
| 型号： | LTC3805IMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK CM 10MSOP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 700kHz |
| 占空比： | 95% |
| 电源电压： | 3.95 V ~ 75 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 ~ 125°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 相关产品： | 732-2264-6-ND - TRANS FLYBACK LTC3805 36.3UH 732-2264-1-ND - TRANS FLYBACK LTC3805 36.3UH 732-2264-2-ND - TRANS FLYBACK LTC3805 36.3UH |
LTC3805
APPLICATIONS INFORMATION
C VCC
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.
The LTC3805 itself imposes no limits on allowed input volt-
age V IN or output voltage V OUT . These are all determined
by the ratings of the external power components. The
factors are: Q1 maximum drain-source voltage (B VDSS ),
on-resistance (R DS(ON) ) and maximum drain current, T1
saturation flux level and winding insulation breakdown
voltages, C IN and C OUT maximum working voltage, equiva-
lent series resistance (ESR), and maximum ripple current
ratings, and D1 and R SENSE power ratings.
V CC Bias Power
The V CC pin must be bypassed to the GND pin with a
minimum 1μF ceramic or tantalum capacitor located im-
mediately adjacent to the two pins. Proper supply bypassing
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
R VCC connected between the input voltage and V CC . The
built-in shunt regulator limits the voltage on the V CC 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 V CC 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 R START and C VCC form a start-up trickle charger
while D2 powers V CC from the output once the converter
is in normal operation. Note that R START need only supply
the very small 40μA micropower start-up current while
V IN
LTC3805
R VCC
V CC
GND
3805 F02
Figure 2. Powering the LTC3805 via the
Internal Shunt Regulator
I TH
OC
I SENSE
GND
PRI
V IN
36V TO 72V
C IN
2.2μF
× 2
R ITH
20k
C ITH
470pF
C SS
0.1μF
R1
221k
R2
8.66k
R FS
118k
R START
100k
C VCC
22μF
V CC GATE
RUN
LTC3805
SSFLT
SYNC
FS
FB
D2
R OC
1.33k
R SLOPE
3k
SEC
Q1
R SENSE
68m
R3
71.5k
R4
13.7k
V OUT
5V AT 2A
C OUT
100μF
× 2
3805 F02
Figure 3. Powering the LTC3805 from the Output
3805fg
11
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| LTC3805MPMSE#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3805MPMSE#TRPBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3805MPMSE-5#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3805MPMSE-5#TRPBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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