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| 型号： | LT1506IS8-3.3 |
| 厂商： | Linear Technology |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 4.5A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 4.5A |
| 同步整流器： | 无 |
| 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： | 管件 |
| 供应商设备封装： | 8-SOIC |
LT1506
APPLICATIO N S I N FOR M ATIO N
Table 2
VENDOR/
PART NO.
Coiltronics
CTX2-1
CTX5-4
CTX8-4
CTX2-1P
VALUE DC
( μ H) (Amps)
2 4.1
5 4.4
8 3.5
2 3.4
CORE
TYPE
Tor
Tor
Tor
Tor
SERIES CORE
RESIS- MATER- HEIGHT
TANCE( ? ) IAL (mm)
0.011 KM μ 4.2
0.019 KM μ 6.4
0.020 KM μ 6.4
0.014 52 4.2
range for typical LT1506 applications is 0.05 ? to 0.2 ? . 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
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
CTX2-3P
CTX5-4P
2
5
4.6
3.3
Tor
Tor
0.012
0.027
52
52
4.8
6.4
tantalum capacitor, it will have high ESR, and output ripple
voltage will be terrible. Table 3 shows some typical solid
Sumida
tantalum surface mount capacitors.
CDRH125
CDRH125
CDRH125
10
12
15
4.0
3.5
3.3
SC
SC
SC
0.025
0.027
0.030
Fer
Fer
Fer
6
6
6
Table 3. Surface Mount Solid Tantalum Capacitor ESR
and Ripple Current
E Case Size ESR (Max., ? ) Ripple Current (A)
CDRH125
18
3.0
SC
0.034
Fer
6
AVX TPS, Sprague 593D
0.1 to 0.3
0.7 to 1.1
Coilcraft
AVX TAJ
0.7 to 0.9
0.4
DT3316-222
2.2
5
SC
0.035
Fer
5.1
D Case Size
DT3316-332
DT3316-472
3.3
4.7
5
3
SC
SC
0.040
0.045
Fer
Fer
5.1
5.1
AVX TPS, Sprague 593D
C Case Size
0.1 to 0.3
0.7 to 1.1
Pulse
AVX TPS
0.2 (typ)
0.5 (typ)
PE-53650
4
4.8
Tor
0.017
Fer
9.1
PE-53651
PE-53652
PE-53653
5
9
16
5.4
5.5
5.1
Tor
Tor
Tor
0.018
0.022
0.032
Fer
Fer
Fer
9.1
10
10
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
Dale
specially tested for surge capability, but surge ruggedness
IHSM-4825
IHSM-4825
IHSM-5832
IHSM-5832
IHSM-7832
2.7
4.7
10
15
22
5.1
4.0
4.3
3.5
3.8
Open
Open
Open
Open
Open
0.034
0.047
0.053
0.078
0.054
Fer
Fer
Fer
Fer
Fer
5.6
5.6
7.1
7.1
7.1
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
discharge surges, such as when the regulator output is
dead shorted, do not harm the capacitors.
Tor = Toroid
SC = Semiclosed 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
Unlike the input capacitor, RMS ripple current in the
output capacitor is normally low enough that ripple cur-
rent rating is not an issue. The current waveform is
triangular with a typical value of 200mA RMS . The formula
to calculate this is:
Output Capacitor Ripple Current (RMS):
( )( )( )
L f V
SeriesResistance(ESR),becausethisiswhatdetermines
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
I RIPPLE ( RMS ) =
0 . 29 ( V OUT ) ( V IN ? V OUT
IN
)
11
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