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| 型号： | LTC1530CS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC SW REG CTRLR SYNC HIPWR 8SOIC |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel Pentium? II，AMD-K6?-2 |
| 输入电压： | 3.75 V ~ 13.2 V |
| 输出数： | 1 |
| 输出电压： | 1.3 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
LTC1530
APPLICATIO S I FOR ATIO
Table 1. Recommended MOSFETs for LTC1530 Applications
MANUFACTURER
Siliconix
Siliconix
ON Semiconductor
Fairchild
ON Semiconductor
IR
IR
Fuji
PART NO.
SUD50N03-10
Si4410DY
MTD20N03HDL
FDS6680
MTB75N03HDL*
IRL3103S
IRLZ44
2SK1388
PACKAGE
TO-252
SO-8
DPAK
SO-8
D 2 PAK
D 2 PAK
TO-220
TO-220
RDS(ON)
AT 25 ° C
( ? )
0.019
0.020
0.035
0.01
0.0075
0.014
0.028
0.037
RATED CURRENT
(A)
15A at 25 ° C
10A at 100 ° C
10A at 25 ° C
8A at 75 ° C
20A at 25 ° C
16A at 100 ° C
11.5A at 25 ° C
75A at 25 ° C
59A at 100 ° C
56A at 25 ° C
40A at 100 ° C
50A at 25 ° C
36A at 100 ° C
35A at 25 ° C
TYPICAL INPUT
CAPACITANCE
Ciss (pF)
3200
2700
880
2070
4025
1600
3300
1750
θ JC
( ° C/W)
1.8
—
1.67
25
1.0
1.8
1.0
2.08
T JMAX
( ° C)
175
150
150
150
150
175
175
150
Note: Please refer to the manufacturer’s data sheet for testing conditions and detailed information.
*Users must consider the power dissipation and thermal effects in the LTC1530 if driving external MOSFETs with high values of input capacitance.
Refer to the PV CC Supply Current vs GATE Capacitance in the Typical Performance Characteristics section.
( V IN ? V OUT )( V OUT )
( f OSC )( L O )( V IN )
( 2 . 2 V )( 0 . 56 ) = 2 A P-P
whereListheinductorvalueinμH.Withproperfrequency
compensation, the combination of the inductor and output
capacitor values determine the transient recovery time. In
general, a smaller value inductor improves transient
response at the expense of ripple and inductor core
saturation rating. A 2 μ H inductor has a 0.9A/ μ s rise time
in this application, resulting in a 5.5 μ s delay in responding
to a 5A load current step. During this 5.5 μ s, the difference
between the inductor current and the output current is
made up by the output capacitor. This action causes a
temporary voltage droop at the output. To minimize this
effect, the inductor value should usually be in the 1 μ H to
5 μ H range for most 5V input LTC1530 circuits. Different
combinations of input and output voltages and expected
loads may require different values.
I RIPPLE =
where
f OSC = LTC1530 oscillator frequency
L O = Inductor value
Solving this equation for a typical 5V to 2.8V application
with a 2 μ H inductor, ripple current is:
( 300 kHz )( 2 μ H )
Peak inductor current at 11.2A load:
Once the required inductor value is selected, choose the
inductor core type based on peak current and efficiency
requirements. Peak current in the inductor is equal to the
11 . 2 A +
2A
2
= 12 . 2 A
maximum output load current plus half of the peak-to-
peak inductor ripple current. Inductor ripple current is set
by the inductor’s value, the input voltage, the output
voltage and the operating frequency. If the efficiency is
high, ripple current is approximately equal to:
The ripple current should generally fall between 10% and
40% of the output current. The inductor must be able to
withstand this peak current without saturating, and the
copper resistance in the winding should be kept as low as
possible to minimize resistive power loss. Note that in
1530fa
13
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| LTC1530IS8#TR | 功能描述:IC SW REG CTRLR SYNC HIPWR 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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