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参数资料
| 型号： | LTC3832-1ES8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 360kHz |
| 占空比： | 95% |
| 电源电压： | 3 V ~ 8 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC3832/LTC3832-1
APPLICATIO S I FOR ATIO
=
Note that the required R DS(ON) for Q2 is roughly three
times that of Q1 in this example. Note also that while the
required R DS(ON) values suggest large MOSFETs, the
power dissipation numbers are only 0.83W per device or
less; large TO-220 packages and heat sinks are not neces-
sarily required in high efficiency applications. Siliconix
Si4410DY or International Rectifier IRF7413 (both in
SO-8) or Siliconix SUD50N03-10 (TO-252) or ON Semi-
conductor MTD20N03HDL (DPAK) are small footprint
surface mount devices with R DS(ON) values below 0.03 ?
at 5V of V GS that work well in LTC3832 circuits. Using a
higher P MAX value in the R DS(ON) calculations generally
decreases the MOSFET cost and the circuit efficiency and
increases the MOSFET heat sink requirements.
Table 1 highlights a variety of power MOSFETs for use in
LTC3832 applications.
Inductor Selection
The inductor is often the largest component in an LTC3832
design and must be chosen carefully. Choose the inductor
value and type based on output slew rate requirements. The
maximum rate of rise of inductor current is set by the
inductor’s value, the input-to-output voltage differential and
the LTC3832’s maximum duty cycle. In a typical 3.3V in-
put, 2.5V output application, the maximum rise time will be:
DC MAX ? ( V IN – V OUT ) 0 . 76 A
L O L O μ s
where L O is the inductor value in μ H. With proper fre-
quency compensation, the combination of the inductor
and output capacitor values determine the transient recov-
ery time. In general, a smaller value inductor improves
transient response at the expense of ripple and inductor
core saturation rating. A 1 μ H inductor has a 0.76A/ μ s rise
time in this application, resulting in a 6.6 μ s delay in
responding to a 5A load current step. During this 6.6 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 3.3V input LTC3832
circuits. To optimize performance, different combinations
of input and output voltages and expected loads may
require different inductor values.
Once the required value is known, the inductor core type
can be chosen based on peak current and efficiency
Table 1. Recommended MOSFETs for LTC3832 Applications
TYPICAL INPUT
PARTS
Siliconix SUD50N03-10
TO-252
Siliconix Si4410DY
SO-8
ON Semiconductor MTD20N03HDL
DPAK
Fairchild FDS6670A
R DS(ON)
AT 25 ° C (m ? )
19
20
35
8
RATED CURRENT (A)
15 at 25 ° C
10 at 100 ° C
10 at 25 ° C
8 at 70 ° C
20 at 25 ° C
16 at 100 ° C
13 at 25 ° C
CAPACITANCE
C ISS (pF)
3200
2700
880
3200
θ JC ( ° C/W)
1.8
1.67
25
T JMAX ( ° C)
175
150
150
150
S0-8
Fairchild FDS6680
10
11.5 at 25 ° C
2070
25
150
SO-8
ON Semiconductor MTB75N03HDL
DD PAK
IR IRL3103S
DD PAK
IR IRLZ44
TO-220
Fuji 2SK1388
9
19
28
37
75 at 25 ° C
59 at 100 ° C
64 at 25 ° C
45 at 100 ° C
50 at 25 ° C
36 at 100 ° C
35 at 25 ° C
4025
1600
3300
1750
1
1.4
1
2.08
150
175
175
150
TO-220
Note: Please refer to the manufacturer’s data sheet for testing conditions and detailed information.
sn3832 3832fs
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| LTC3832EGN | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3832EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3832EGN#TR | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3832EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3832EG-T | 制造商:LINEAR TECHNOLOGY CORPORA 功能描述: 制造商:LINTEC 功能描述: |
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