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參數(shù)資料
| 型號： | LTC1147-3.3 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Efficiency Step-Down Switching Regulator Controllers(高效率,步降開關穩(wěn)壓器) |
| 中文描述： | 高效率降壓型開關穩(wěn)壓器控制器（高效率，步降開關穩(wěn)壓器） |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 158K |
| 代理商： | LTC1147-3.3 |
5
LTC1147-3.3
LTC1147-5/LTC 1147L
V
IN
(Pin 1):
Main Supply Pin. Must be closely decoupled
to ground Pin 7.
C
T
(Pin 2):
External capacitor C
T
from Pin 2 to ground sets
the operating frequency. The actual frequency is also
dependent upon the input voltage.
I
TH
(Pin 3):
Gain Amplifier Decoupling Point. The current
comparator threshold increases with the Pin 3 voltage.
SENSE
–
(Pin 4):
Connects to internal resistive divider
which sets the output voltage. Pin 4 is also the (–) input for
the current comparator.
SENSE
+
(Pin 5):
The (+) input to the current comparator.
A built-in offset between Pins 4 and 5 in conjunction with
R
SENSE
sets the current trip threshold.
SHDN/V
FB
(Pin 6):
When grounded, the fixed output
versions of the LTC1147 family operate normally. Pulling
Pin 6 high holds the P-channel MOSFET off and puts the
LTC1147 in micropower shutdown mode. Requires CMOS
logic signal with t
r
, t
f
< 1
μ
s. Do not leave this pin floating.
On the LTC1147L this pin serves as the feedback pin from
an external resistive divider used to set the output voltage.
GND (Pin 7):
Two independent ground lines must be
routed separately to: 1) the (–) terminal of C
OUT
, and 2) the
cathode of the Schottky diode and (–) terminal of C
IN
.
PDRIVE (Pin 8):
High current drive for the P-channel
MOSFET. Voltage swing at this pin is from V
IN
to ground.
Pin 6 Connection Shown For LTC1147-3.3 and LTC1147-5; Changes Create LTC1147L.
+
–
1
PDRIVE
V
IN
GND
R
S
Q
–
+
C
25mV TO 150mV
3
13k
I
TH
1.25V
6
REFERENCE
–
+
SHDN
V
OS
–
+
V
G
5
6
SENSE
+
100k
5pF
–
+
V
TH1
T
–
+
V
TH2
S
SLEEP
2
C
T
OFF-TIME
CONTROL
V
IN
SENSE
–
SENSE
–
4
8
7
LTC1147 FD
V
FB
PI FU CTIO S
FU CTIO AL DIAGRA
W
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1147-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Step-Down Switching Regulator Controllers |
| LTC1147C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Step-Down Switching Regulator Controllers |
| LTC1147CN8-3.3 | 功能描述:IC REG CTRLR BUCK PWM CM 8-DIP 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:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 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:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC1147CN8-3.3#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-DIP 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) |
| LTC1147CN8-5 | 功能描述:IC REG CTRLR BUCK PWM CM 8-DIP 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) |
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