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參數(shù)資料
| 型號(hào)： | LTC1436AIGN-PLL |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 2 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 23/28頁 |
| 文件大?。?/td> | 518K |
| 代理商： | LTC1436AIGN-PLL |
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23
LTC1436A
LTC1436A-PLL/LTC1437A
APPLICATIO
S I
N
FOR
ATIO
U
The power dissipation on the topside MOSFET can be
easily estimated. Choosing a Siliconix Si4412DY results
in: R
DS(ON)
= 0.042
, C
RSS
= 100pF. At maximum input
voltage with T (estimated) = 50
°
C:
W
U
P
V
V
C
C
V
A
pF
kHz
mW
MAIN
=
( )
3
+
(
(
°
°
)
[
]
(
)
+
)
)(
)(
)
=
1 6
22
2 5 22
.
1
0 005 50
.
25
0 042
.
3
100
250
88
2
1 85
.
.
The most stringent requirement for the synchronous
N-channel MOSFET occurs when V
OUT
= 0 (i.e. short
circuit). In this case the worst-case dissipation rises to:
(
P
I
R
SYNC
SC AVG
DS ON
)
=
+
)
)
2
1
δ
With the 0.033
sense resistor I
SC(AVG)
= 4A will result,
increasing the Si4412DY dissipation to 950mW at a die
temperature of 105
°
C.
C
IN
is chosen for an RMS current rating of at least 1.5A at
temperature. C
OUT
is chosen with an ESR of 0.03
for low
output ripple. The output ripple in continuous mode will be
highest at the maximum input voltage. The output voltage
ripple due to ESR is approximately:
V
R
I
ORIPPLE
ESR
L
=
A
mV
(
)
=
(
)
=
0 03
.
13
.
39
P-P
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1436A/LTC1437A. These items are also illustrated
graphically in the layout diagram of Figure 15. Check the
following in your layout:
1. Are the signal and power grounds segregated The
LTC1436A/LTC1437A signal ground pin must return to
the (–) plate of C
OUT
. The power ground connects to the
source of the bottom N-channel MOSFET, anode of the
Schottky diode, and (–) plate of C
IN
, which should have
as short lead lengths as possible.
2. Does the LTC1436A/LTC1437A V
OSENSE
pin connect to
the (+) plate of C
OUT
In adjustable applications, the
resistive divider R1/R2 must be connected between the
(+) plate of C
OUT
and signal ground. The 100pF capaci-
tor should be as close as possible to the LTC1436A/
LTC1437A.
3. Are the SENSE
–
and SENSE
+
leads routed together with
minimum PC trace spacing The filter capacitor be-
tween SENSE
+
and SENSE
–
should be as close as
possible to the LTC1436A/LTC1437A.
4. Does the (+) plate of C
IN
connect to the drain of the
topside MOSFET(s) as closely as possible This capaci-
tor provides the AC current to the MOSFET(s).
5. Is the INTV
CC
decoupling capacitor connected closely
between
INTV
CC
and the power ground pin This ca-
pacitor carries the MOSFET driver peak currents.
6. Keep the switching node SW away from sensitive small-
signal nodes. Ideally, the switch node should be placed
at the furthest point from the LTC1436A/LTC1437A.
7. Route the PLLIN line away from Boost and SW pins to
avoid unwanted pickup (Boost and SW pins have high
dV/dTs).
8. SGND should be used exclusively for grounding exter-
nal components on PLL LPF, C
OSC
, I
TH
, LBI, SFB,
V
OSENSE
and AUXFB pins.
9. If operating close to the minimum on-time limit, is the
sense resistor oriented on the radial axis of the induc-
tor See Figure 13.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1436A | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1436A-PLL | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1436ACGN | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1436AIGN | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1437A | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1436AIGN-PLL#PBF | 功能描述:IC REG CTRLR BUCK 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 |
| LTC1436AIGN-PLL#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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 |
| LTC1436AIGN-PLL#TRPBF | 功能描述:IC REG CTRLR BUCK 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 |
| LTC1436CGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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 |
| LTC1436CGN#PBF | 制造商:Linear Technology 功能描述:Step-Down Switching Regulators |
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