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參數(shù)資料
| 型號： | LT3437 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Panels; For Use With:EUROCARD Subracks RoHS Compliant: Yes |
| 中文描述： | 高電壓，200kHz降壓500mA的降壓開關穩(wěn)壓器以100？的靜態(tài)電流 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大小： | 523K |
| 代理商： | LT3437 |
LT3437
18
3437f
APPLICATIOU
inductance of approximately 25nH/inch. At switch off, this
parasitic inductance produces a flyback spike across the
LT3437 switch. When operating at higher currents and
input voltages, with poor layout, this spike can generate
voltages across the LT3437 that may exceed its absolute
maximum rating. A ground plane should always be used
under the switcher circuitry to prevent interplane coupling
and overall noise.
W
U
U
The V
C
and FB components should be kept as far away as
possible from the switch and boost nodes. The LT3437
pinout has been designed to aid in this. The ground for
these components should be separated from the switch
current path. Failure to do so will result in poor stability or
subharmonic oscillation.
Board layout also has a significant effect on thermal
resistance. Pin 4/Pin 10 and the exposed die pad, Pin 11/
Pin 17, are connected by a continuous copper plate that
runs under the LT3437 die. This is the best thermal path
for heat out of the package. Reducing the thermal resis-
tance from Pin 4 and the exposed pad onto the board will
reduce die temperature and increase the power capability
of the LT3437. This is achieved by providing as much
copper area as possible around the exposed pad. Adding
multiple solder filled feedthroughs, under and around this
pad, to an internal ground plane will also help. Similar
treatment to the catch diode and coil terminations will
reduce any additional heating effects.
THERMAL CALCULATIONS
Power dissipation in the LT3437 chip comes from four
sources: switch DC loss, switch AC loss, boost circuit
current, and input quiescent current. The following formu-
las show how to calculate each of these losses. These
formulas assume continuous mode operation, and should
not be used for calculating efficiency at light load currents.
Switch loss:
P
R
V
V
t
I
V
f
SW
SW OUT
OUT
IN
EFF
OUT
IN
=
) (
)
+
(
)(
)( )( )
2
1 2
Boost current loss:
P
V
I
V
BOOST
OUT
OUT
IN
=
(
)
(
)
2
30
/
Quiescent current loss:
P
Q
= V
IN
(500
μ
A) + V
OUT
(800
μ
A)
R
SW
= switch resistance (
≈
1 when hot )
t
EFF
= effective switch current/voltage overlap time
Figure 9. Suggested Layouts
Figure 8. High Speed Switching Path
C2
C1
3437 F08
D1
L1
V
IN
LT3437
V
OUT
V
IN
SW
HIGH
FREQUENCY
CIRCULATION
PATH
+
LOAD
3437 F09b
DD PACKAGE TOPSIDE METAL
C1
C2
D1
L1
3437 F09a
FE PACKAGE TOPSIDE METAL
D1
C1
C2
L1
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT3437_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100μA Quiescent Current |
| LT3437EDD | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.3V to 60V 10-Pin DFN EP |
| LT3437EDD#PBF | 功能描述:IC REG BUCK ADJ 0.5A 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT3437EDD#TRPBF | 功能描述:IC REG BUCK ADJ 0.5A 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LT3437EFE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.3V to 60V 16-Pin TSSOP EP |
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