参数资料
型号: LT1578IS8#TR
厂商: Linear Technology
文件页数: 11/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 8SOIC
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1.21V
输入电压: 4 V ~ 15 V
PWM 型: 电流模式
频率 - 开关: 200kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-SOIC
LT1578/LT1578-2.5
V OUT ( V IN ? V OUT )
2 ( )( )( )
f L V
APPLICATIO NS INFORMATION
I PEAK = I OUT +
IN
Table 1
VENDOR/
PART NO.
SERIES CORE
VALUE DC CORE RESIS- MATER- HEIGHT
( μ H) (Amps) TYPE TANCE( ? ) IAL (mm)
V IN = Maximum input voltage
f = Switching frequency, 200kHz
3. Decide if the design can tolerate an “open” core geom-
etry like a rod or barrel, with high magnetic field
radiation, or whether it needs a closed core like a toroid
to prevent EMI problems. One would not want an open
core next to a magnetic storage media, for instance!
Coiltronics
CTX15-2
CTX33-2
CTX68-4
CTX15-1P
CTX33-2P
CTX68-4P
15
33
68
15
33
68
1.7
1.4
1.2
1.4
1.3
1.1
Tor
Tor
Tor
Tor
Tor
Tor
0.059
0.106
0.158
0.087
0.126
0.238
KM μ
KM μ
KM μ
52
52
52
6.0
6.0
6.4
4.2
6.0
6.4
This is a tough decision because the rods or barrels are
Sumida
temptingly cheap and small and there are no helpful
guidelines to calculate when the magnetic field radia-
tion will be a problem.
4. Start shopping for an inductor (see representative
surface mount units in Table 1) which meets the
requirements of core shape, peak current (to avoid
saturation), average current (to limit heating), and fault
current (if the inductor gets too hot, wire insulation will
CDRH74-150
CDH115-330
CDRH125-680
CDH74-330
Coilcraft
DO3308P-153
DO3316P-333
DO3316P-683
15
33
68
33
15
33
68
1.47
1.68
1.5
1.45
2
2
1.4
SC
SC
SC
SC
SC
SC
SC
0.081
0.082
0.12
0.17
0.12
0.1
0.18
Fer
Fer
Fer
Fer
Fer
Fer
Fer
4.5
5.2
6
5.2
3
5.21
5.21
melt and cause turn-to-turn shorts). Keep in mind that
Pulse
all good things like high efficiency, low profile, and high
temperature operation will increase cost, sometimes
dramatically. Get a quote on the cheapest unit first to
calibrate yourself on price, then ask for what you really
PE-53602
PE-53604
PE-53632
PE-53633
35
73
22
40
1.4
1.3
2.7
2.7
Tor
Tor
Tor
Tor
0.166
0.290
0.063
0.085
Fer
Fer
Fer
Fer
9.1
9.1
9.1
10
want.
Gowanda
5. After making an initial choice, consider the secondary
things like output voltage ripple, second sourcing, etc.
Use the experts in the Linear Technology’s applica-
SMP3316-152K
SMP3316-332K
SMP3316-682K
15
33
68
3.5
2.3
1.7
SC
SC
SC
0.041
0.092
0.178
Fer
Fer
Fer
6
6
6
tions department if you feel uncertain about the final
choice. They have experience with a wide range of
inductor types and can tell you about the latest devel-
opments in low profile, surface mounting, etc.
Tor = Toroid
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM μ = Kool M μ
11
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