参数资料
型号: LT1375CN8-5#PBF
厂商: Linear Technology
文件页数: 12/28页
文件大小: 0K
描述: IC REG BUCK 5V 1.5A 8DIP
标准包装: 50
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 5V
输入电压: 5 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: 0°C ~ 125°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
供应商设备封装: 8-PDIP
LT1375/LT1376
APPLICATIO N S I N FOR M ATIO N
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-
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
Output Capacitor
The output capacitor is normally chosen by its Effective
Series Resistance (ESR), because this is what determines
Table 2
VENDOR/
PART NO.
Coiltronics
CTX5-1
VALUE DC CORE
( μ H) (Amps) TYPE
5 2.3 Tor
SERIES
RESIS-
TANCE( ? )
0.027
CORE
MATER- HEIGHT
IAL (mm)
KM μ 4.2
output ripple voltage. At 500kHz, any polarized capacitor
is essentially resistive. To get low ESR takes volume, so
physically smaller capacitors have high ESR. The ESR
range for typical LT1376 applications is 0.05 ? to 0.5 ? . A
typical output capacitor is an AVX type TPS, 100 μ F at 10V,
with a guaranteed ESR less than 0.1 ? . This is a “D” size
CTX10-1
CTX20-1
CTX15-2
CTX20-3
CTX20-4
CTX5-1P
CTX10-1P
CTX15-1P
CTX20-1P
CTX20-2P
CTX20-4P
10
20
15
20
20
5
10
15
20
20
20
1.9
1.0
1.8
1.5
2.2
1.8
1.6
1.2
1.0
1.3
1.8
Tor
Tor
Tor
Tor
Tor
Tor
Tor
Tor
Tor
Tor
Tor
0.039
0.137
0.058
0.093
0.059
0.021
0.030
0.046
0.081
0.052
0.039
KM μ
KM μ
KM μ
KM μ
KM μ
52
52
52
52
52
52
4.2
4.2
6.0
4.7
6.4
4.2
4.2
4.2
4.2
6.0
6.35
surface mount solid tantalum capacitor. TPS capacitors
are specially constructed and tested for low ESR, so they
give the lowest ESR for a given volume. The value in
microfarads is not particularly critical, and values from
22 μ F to greater than 500 μ F work well, but you cannot
cheat mother nature on ESR. If you find a tiny 22 μ F solid
tantalum capacitor, it will have high ESR, and output ripple
voltage will be terrible. Table 3 shows some typical solid
tantalum surface mount capacitors.
Table 3. Surface Mount Solid Tantalum Capacitor ESR
and Ripple Current
Sumida
E Case Size ESR (Max., ? ) Ripple Current (A)
CDRH64
CDRH74
CDRH73
CDRH73
CD73
CD73
CD104
CD104
10
22
10
22
10
18
10
18
1.7
1.2
1.7
1.1
1.4
1.1
2.4
1.7
SC
SC
SC
SC
Open
Open
Open
Open
0.084
0.077
0.055
0.15
0.062
0.085
0.041
0.062
Fer
Fer
Fer
Fer
Fer
Fer
Fer
Fer
4.5
4.5
3.4
3.4
3.5
3.5
4.0
4.0
AVX TPS, Sprague 593D
AVX TAJ
D Case Size
AVX TPS, Sprague 593D
AVX TAJ
C Case Size
AVX TPS
AVX TAJ
0.1 to 0.3
0.7 to 0.9
0.1 to 0.3
0.9 to 2.0
0.2 (typ)
1.8 to 3.0
0.7 to 1.1
0.4
0.7 to 1.1
0.36 to 0.24
0.5 (typ)
0.22 to 0.17
Gowanda
B Case Size
SM20-102K
10
1.3
Open
0.038
Fer
7.0
AVX TAJ
2.5 to 10
0.16 to 0.08
SM20-152K
SM20-222K
Dale
IHSM-4825
IHSM-4825
IHSM-5832
IHSM-5832
IHSM-7832
15
22
10
22
10
22
22
1.3
1.3
3.1
1.7
4.3
2.8
3.8
Open
Open
Open
Open
Open
Open
Open
0.049
0.059
0.071
0.152
0.053
0.12
0.054
Fer
Fer
Fer
Fer
Fer
Fer
Fer
7.0
7.0
5.6
5.6
7.1
7.1
7.1
Many engineers have heard that solid tantalum capacitors
are prone to failure if they undergo high surge currents.
This is historically true, and type TPS capacitors are
specially tested for surge capability, but surge ruggedness
is not a critical issue with the output capacitor. Solid
tantalum capacitors fail during very high turn-on surges,
which do not occur at the output of regulators. High
13756fd
12
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