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參數(shù)資料
| 型號： | LTC3780EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DIODE SCHOTTKY SINGLE 25V 200mW 0.4V-vf 200mA-IFM 10mA-IF 0.5uA-IR SOD-123 3K/REEL |
| 中文描述： | 3 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 18/28頁 |
| 文件大小： | 421K |
| 代理商： | LTC3780EG |
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18
LTC3780
3780f
APPLICATIU
(Switch B and C shown in Figure 1). Important parameters
for the power MOSFETs are the breakdown voltage V
BR,DSS
,
threshold voltage V
GS,TH
, on-resistance R
DS(ON)
, reverse
transfer capacitance C
RSS
and maximum current I
DS(MAX)
.
The drive voltage is set by the 6V INTV
CC
supply. Conse-
quently, logic-level threshold MOSFETs must be used in
LTC3780 applications. If the input voltage is expected to
drop below 5V, then the sub-logic threshold MOSFETs
should be considered.
In order to select the power MOSFETs, the power dissi-
pated by the device must be known. For Switch A, the
maximum power dissipation happens in Boost mode,
when it remains on all the time. Its maximum power
dissipation at maximum output current is given by:
W
U
U
P
V
V
I
R
ABOOST
,
OUT
IN
OUT MAX
(
T
DS ON
(
)
)
=
2
ρ
where
ρ
T
is a normalization factor (unity at 25
°
C) account-
ing for the significant variation in on-resistance with
temperature, typically about 0.4%/
°
C as shown in Fig-
ure 9. For a maximum junction temperature of 125
°
C,
using a value
ρ
T
= 1.5 is reasonable.
Switch B operates in Buck mode as the synchronous
rectifier. Its power dissipation at maximum output current
is given by:
P
V
V
V
I
R
BBUCK
,
IN
OUT
IN
OUT MAX
(
T
DS ON
(
)
)
–
=
2
ρ
Switch C operates in Boost mode as the control switch. Its
power dissipation at maximum current is given by:
P
V
V
V
V
I
R
k V
I
V
C
f
CBOOST
,
OUT
IN
2
OUT
IN
OUT MAX
(
T
DS ON
(
OUT
OUT MAX
(
IN
RSS
)
)
)
–
=
(
)
+
2
3
ρ
where C
RSS
is usually specified by the MOSFET manufac-
turers. The constant k, which accounts for the loss caused
by reverse recovery current, is inversely proportional to
the gate drive current and has an empirical value of 1.7.
For Switch D, the maximum power dissipation happens in
Boost mode, when its duty cycle is higher than 50%. Its
maximum power dissipation at maximum output current
is given by:
P
V
V
V
V
I
R
DBUCK
,
IN
OUT
OUT
IN
OUT MAX
(
T
DS ON
(
)
)
=
2
ρ
For the same output voltage and current, Switch A has the
highest power dissipation and Switch B has the lowest
power dissipation unless a short occurs at the output.
From a known power dissipated in the power MOSFET, its
junction temperature can be obtained using the following
formula:
T
J
= T
A
+ P R
TH(JA)
JUNCTION TEMPERATURE (
°
C)
–50
ρ
T
)
1.0
1.5
150
3780 F09
0.5
0
0
50
100
2.0
Figure 9. Normalized R
DS(ON)
vs Temperature
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3780EUH | DIODE SCHOTTKY SINGLE 25V 200mW 0.4V-vf 200mA-IFM 10mA-IF 0.5uA-IR SOD-323 3K/REEL |
| LTC3830EGN | High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation |
| LTC3830 | 16-Bit Bus Transceiver With 3-State Outputs 48-SSOP -40 to 85 |
| LTC3830-1 | 16-Bit Bus Transceiver With 3-State Outputs 54-BGA MICROSTAR JUNIOR -40 to 85 |
| LTC3830-1ES8 | 16-Bit Bus Transceiver With 3-State Outputs 56-BGA MICROSTAR JUNIOR -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3780EG#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC3780EG#TR | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 24-Pin SSOP T/R |
| LTC3780EG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 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 ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3780EGPBF | 制造商:Linear Technology 功能描述:4-Switch Buck-Boost Controller SSOP24 |
| LTC3780EUH | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 32-Pin QFN EP |
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