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| 型号： | LT1374CR#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 4.5A D2PAK |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.42 V ~ 21.5 V |
| 输入电压： | 5 V ~ 25 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： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 包装： | 管件 |
| 供应商设备封装： | D2PAK-7 |
| 产品目录页面： | 1327 (CN2011-ZH PDF) |
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LT1374
APPLICATIO N S I N FOR M ATIO N
When choosing an inductor you might have to consider
maximum load current, core and copper losses, allowable
component height, output voltage ripple, EMI, fault cur-
rent in the inductor, saturation, and of course, cost. The
following procedure is suggested as a way of handling
these somewhat complicated and conflicting requirements.
1. Choose a value in microhenries from the graphs of
maximum load current and core loss. Choosing a small
core next to a magnetic storage media, for instance!
This is a tough decision because the rods or barrels are
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 2) which meets the
requirements of core shape, peak current (to avoid
inductor may result in discontinuous mode operation
at lighter loads, but the LT1374 is designed to work
well in either mode. Keep in mind that lower core loss
means higher cost, at least for closed core geometries
like toroids. The core loss graphs show both absolute
Table 2
VENDOR/
PART NO.
Coiltronics
VALUE DC
( μ H) (Amps)
CORE
TYPE
SERIES CORE
RESIS- MATER- HEIGHT
TANCE( ? ) IAL (mm)
loss and percent loss for a 5W output, so actual percent
losses must be calculated for each situation.
Assume that the average inductor current is equal to
load current and decide whether or not the inductor
must withstand continuous fault conditions. If maxi-
mum load current is 0.5A, for instance, a 0.5A inductor
CTX2-1
CTX5-4
CTX8-4
CTX2-1P
CTX2-3P
CTX5-4P
2
5
8
2
2
5
4.1
4.4
3.5
3.4
4.6
3.3
Tor
Tor
Tor
Tor
Tor
Tor
0.011
0.019
0.020
0.014
0.012
0.027
KM μ
KM μ
KM μ
52
52
52
4.2
6.4
6.4
4.2
4.8
6.4
may not survive a continuous 4.5A overload condition.
Sumida
Dead shorts will actually be more gentle on the induc-
tor because the LT1374 has foldback current limiting.
2. Calculate peak inductor current at full load current to
ensure that the inductor will not saturate. Peak current
CDRH125
CDRH125
CDRH125
CDRH125
10
12
15
18
4.0
3.5
3.3
3.0
SC
SC
SC
SC
0.025
0.027
0.030
0.034
Fer
Fer
Fer
Fer
6
6
6
6
can be significantly higher than output current, espe-
Coilcraft
cially with smaller inductors and lighter loads, so don’t
omit this step. Powdered iron cores are forgiving
because they saturate softly, whereas ferrite cores
DT3316-222
DT3316-332
DT3316-472
2.2
3.3
4.7
5
5
3
SC
SC
SC
0.035
0.040
0.045
Fer
Fer
Fer
5.1
5.1
5.1
saturate abruptly. Other core materials fall somewhere
Pulse
in between. The following formula assumes continu-
ous mode of operation, but it errs only slightly on the
high side for discontinuous mode, so it can be used for
all conditions.
PE-53650
PE-53651
PE-53652
PE-53653
4
5
9
16
4.8
5.4
5.5
5.1
Tor
Tor
Tor
Tor
0.017
0.018
0.022
0.032
Fer
Fer
Fer
Fer
9.1
9.1
10
10
Dale
IHSM-4825
IHSM-4825
IHSM-5832
2.7
4.7
10
5.1
4.0
4.3
Open
Open
Open
0.034
0.047
0.053
Fer
Fer
Fer
5.6
5.6
7.1
V IN = Maximum input voltage
f = Switching frequency, 500kHz
IHSM-5832
IHSM-7832
15
22
3.5
3.8
Open
Open
0.078
0.054
Fer
Fer
7.1
7.1
3. Decide if the design can tolerate an “open” core geom-
Tor = Toroid
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
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM μ = Kool M μ
1374fd
11
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| LT1374CRSYNC | 制造商:Linear Technology 功能描述: |
| LT1374CR-SYNC | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1374CR-SYNC#PBF | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1374CR-SYNC#TR | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1374CR-SYNC#TRPBF | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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