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| 型号： | LTC1147CS8-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 8-SOIC |
| 标准包装： | 100 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 占空比： | 100% |
| 电源电压： | 3.5 V ~ 14 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： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LTC1147-3.3
LTC1147-5/LTC1147L
APPLICATIO S I FOR ATIO
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1147 series. These items are also illustrated graphi-
cally in the layout diagram of Figure 7. Check the following
in your layout:
1. Are the signal and power grounds segregated? The
LTC1147 ground (Pin 7) must return separately to a)
the power and b) signal grounds. The power ground
(a) returns to the source anode of the Schottky diode
and (–) plate of C IN , which should have lead lengths
as short as possible. The signal ground (b) connects
to the (–) plate of C OUT .
2. Does the LTC1147 SENSE – (Pin 4) connect to a point
close to R SENSE and the (+) plate of C OUT ?
3. Are the SENSE – and SENSE + leads routed together with
minimum PC trace spacing? The 1000pF capacitor
between Pins 4 and 5 should be as close as possible to
the LTC1147.
4. Does the (+) plate of C IN connect to the source of the
P-channel MOSFET as closely as possible? This capaci-
tor provides the AC current to the P-channel MOSFET.
5. Is the input decoupling capacitor (0.1 μ F/1 μ F) con-
nected closely between V IN (Pin 1) and ground (Pin 7)?
This capacitor carries the MOSFET driver peak currents.
6. On fixed output versions, is the SHDN (Pin 6) actively
pulled to ground during normal operation? The SHDN
pin is high impedance and must not be allowed to float.
+
V IN
BOLD LINES INDICATE HIGH CURRENT PATHS
+
C IN
P-CH
D1
L
R SENSE
+
C OUT
+
V OUT
–
1 μ F
LTC1147-3.3
LTC1147-5
(LTC1147L)
–
1
V IN
PDRIVE
8
390pF
3300pF
2
3
4
C T
I TH
SENSE –
GND
SHDN
(V FB )
SENSE +
7
6
5
100pF
R1
R2
OUTPUT DIVIDER
REQUIRED WITH
ADJUSTABLE
VERSION ONLY
1k
1000pF
SHUTDOWN
LTC1147 ? F07
Figure 7. LTC1147 Layout Diagram (See Board Layout Checklist)
For additional High Efficiency application circuits see Application Note 54.
sn1147 1147fds
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1147HVCS8-3.3 | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 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) |
| LTC1147HVCS8-3.3#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC 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:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1147HVCS8-3.3#TR | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 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) |
| LTC1147HVCS8-3.3#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC 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:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1147I | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Step-Down Switching Regulator Controllers |
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