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| 型号： | LT3472EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ 50MA 10DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 ±34V |
| 输入电压： | 2.2 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 50mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LT3472
APPLICATIO S I FOR ATIO
Table 1. Recommended Inductors
1A. The selection of inductor and capacitor value should
Part No.
Inductance DCR Current Manufacturer
( μ H) ( ? ) Rating (mA)
ensure the peak of the inrush current to be below 1A. The
peak inrush current can be calculated as follows:
LQH32CN220
22
0.71
250
Murata
? EXP ? – ? arctan ? ? ? ?
LQH32CN470
LQH2MCN220
LQH2MCN470
47
22
47
1.3
2.1
5.1
170
185
120
(814) 237-1431
www.murata.com
I P =
V IN – 0 . 6
L ? ω
? α ? ω ? ?
? ω ? α ? ?
SIN ? arctan? ? ? ?
D1067FB-220M
ELJPC220KF
22
22
2.0
4.0
270
160
TOKO
(408) 432-8281
www.tokoam.com
Panasonic
(714) 373-7334
www.panasonic.com
α =
? ? ω ? ?
r + 1 . 5
2 ? L
? ? α ? ?
CDRH3D16-220
22
0.53
350
Sumida
(847) 956-0666
www.sumida.com
ω =
1
L ? C
–
r
4 ? L 2
LB2012B220M
LEM2520-220
22
22
1.7
5.5
75
125
Taiyo Yuden
(408) 573-4150
where L is the inductance, r is the resistance of the
Capacitor Selection
www.t-yuden.com
inductor and C is the output capacitance. For low DCR
inductors, which is usually the case for this application,
the peak inrush current can be simplified as follows:
? EXP ? – ? ?
Thesmallsizeofceramiccapacitorsmakesthemsuitable
for LT3472 applications. X5R and X57 types of ceramic
capacitors are recommended because they retain their
I P =
V IN – 0 . 6
L ? ω
? α π ?
? ω 2 ?
capacitance over wider voltage and temperature ranges
than other types such as Y5V or Z5U. A 2.2 μ F input
capacitor and a 2.2 μ F output capacitor are sufficient for
Table 3 gives inrush peak currents for some component
selections. Note that inrush current is not a concern if the
input voltage rises slowly.
most LT3472 applications.
Table 3. Inrush Peak Current
Table 2. Recommended Ceramic Capacitor Manufacturers
V IN (V)
r ( ? )
L ( μ H)
C ( μ F)
I P (A)
Manufacturer
Taiyo Yuden
Murata
Kemet
Phone
(408) 573-4150
(814) 237-1431
(408) 986-0424
URL
www.t-yuden.com
www.murata.com
www.kemet.com
5
3.6
3.6
3.6
0.5
0.7
2.1
1.3
22
22
22
47
2.2
2.2
2.2
1
0.89
0.59
0.46
0.32
3.6
0.7
22
1
0.46
Inrush Current
The LT3472 uses internal Schottky diodes. When supply
voltage is abruptly applied to V IN pin, for the positive
channel, the voltage difference between V IN and V POS
generates inrush current flowing from input through the
inductor L P and the internal Schottky diode D P to charge
the output capacitor C OP . For the inverter channel, there is
a similar inrush current flowing from input through the
inductor L N1 path, charging the capacitor C NF , and return-
ing through the internal Schottky diode D N . The maximum
External Diode Selection
As stated previously the LT3472 has internal Schottky
diodes. The Schottky diode D P is sufficient for most step-
up applications. However, for high current inverter appli-
cations, a properly selected external Schottky diode in
parallel with D N can improve efficiency. For external diode
selection, both forward voltage drop and diode capaci-
tance need to be considered. Schottky diodes rated for
higher current usually have lower forward voltage drop
current the Schottky diodes in the LT3472 can sustain is
3472f
7
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| LT3473AEDE#PBF | 功能描述:IC REG BOOST ADJ 1A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3473AEDE#TRPBF | 功能描述:IC REG BOOST ADJ 1A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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