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參數(shù)資料
| 型號： | LTC1147CS8-5#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 217K |
| 代理商： | LTC1147CS8-5#TR |
13
LTC1147-3.3
LTC1147-5/LTC1147L
sn1147 1147fds
APPLICATIO S I FOR ATIO
WU
U
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 CIN, which should have lead lengths
as short as possible. The signal ground (b) connects
to the (–) plate of COUT.
2. Does the LTC1147 SENSE – (Pin 4) connect to a point
close to RSENSE and the (+) plate of COUT?
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 CIN 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
F/1F) con-
nected closely between VIN (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.
For additional High Efficiency application circuits see Application Note 54.
Figure 7. LTC1147 Layout Diagram (See Board Layout Checklist)
1
2
3
4
8
7
6
5
VIN
CT
ITH
SENSE–
PDRIVE
SENSE+
LTC1147-3.3
LTC1147-5
(LTC1147L)
SHUTDOWN
+
1
F
3300pF
1k
390pF
1000pF
+
CIN
P-CH
LRSENSE
+
COUT
+
–
VOUT
+
–
VIN
BOLD LINES INDICATE HIGH CURRENT PATHS
LTC1147 F07
D1
100pF
R1
R2
OUTPUT DIVIDER
REQUIRED WITH
ADJUSTABLE
VERSION ONLY
SHDN
(VFB)
GND
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| LTC1147HVCS8-3.3 | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1147HVCS8-3.3#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1147HVCS8-3.3#TR | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1147HVCS8-3.3#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1147I | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Step-Down Switching Regulator Controllers |
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