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| 型号： | LT3462ES6#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC REG INV ADJ 0.25A TSOT23-6 |
| 标准包装： | 500 |
| 类型： | 反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 -38V |
| 输入电压： | 2.5 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 250mA |
| 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： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
| 其它名称： | LT3462ES6#PBF LT3462ES6#PBF-ND |
LT3462/LT3462A
APPLICATIO S I FOR ATIO
Inrush Current
The LT3462 has a built-in Schottky diode. When supply
voltage is applied to the V IN pin, the voltage difference
between V IN and V D generates inrush current flowing from
input through the inductor and the Schottky diode to
charge the flying capacitor to V IN . The maximum
nonrepetitive surge current the Schottky diode in the
LT3462 can sustain is 1.5A. The selection of inductor and
capacitor value should ensure the peak of the inrush
current to be below 1.5A. The peak inrush current can be
calculated as follows:
Capacitor Selection
Ceramic capacitors are recommended. An X7R or X5R
dielectric should be used to avoid capacitance decreasing
severely with applied voltage and at temperature limits.
The “flying” capacitor between the SW and D pins should
be a ceramic type of value 1 μ F or more. When used in the
dual inductor or coupled inductor topologies the flying
capacitor should have a voltage rating that is more than the
difference between the input and output voltages. For the
charge pump inverter topology, the voltage rating should
be more than the output voltage. The output capacitor
?
?
I P =
V IN – O. 6
L
– 1
C
exp
?
?
? –
?
? 2
π
L
C
?
?
?
?
– 1 ?
should be a ceramic type. Acceptable output capacitance
varies from 1 μ F for high V OUT (–36V), to 10 μ F for low V OUT
(–5V). The input capacitor should be a 1 μ F ceramic type
and be placed as close as possible to the LT3462/LT3462A.
Layout Hints
The high speed operation of the LT3462 demands careful
where L is the inductance between supply and SW, and C
is the capacitance between SW and D.
Table 3 gives inrush peak currents for some component
selections.
Table 3. Inrush Peak Current
attention to board layout. You will not get advertised
performance with careless layout. Figure 2 shows the
recommended component placement. A ceramic capaci-
tor of 1 μ F or more must be placed close to the IC for input
supply bypassing.
V IN (V)
L ( μ H)
C ( μ F)
I P (A)
C1
5
5
12
22
33
47
1
1
1
0.70
0.60
1.40
GND
C2
L1
V IN
1
6
Inductor Selection
Each of the two inductors used with LT3462 should have
a saturation current rating (where inductance is approxi-
mately 70% of zero current inductance ) of approximately
0.25A or greater. If the device is used in the charge pump
mode, where there is only one inductor, then its rating
C3
R1
2
3
R2
C4
5
4
L2
3462 F03
V OUT
should be 0.35A or greater. DCR of the inductors should
be less than 1 ? . For LT3462, a value of 22 μ H is suitable
Figure 2. Suggested Layout
if using a coupled inductor such as Sumida CLS62-220. If
using two separate inductors, increasing the value to
47 μ H will result in the same ripple current. For LT3462A,
a value of 10 μ H for the coupled inductor and 22 μ H for two
inductors will be acceptable for most applications.
3462af
5
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| LT3463AEDD | 功能描述:IC REG INV ADJ 0.25A DL 10DFN RoHS:否 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 |
| LT3463AEDD#PBF | 功能描述:IC REG INV ADJ 0.25A DL 10DFN 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3463AEDD#TR | 功能描述:IC REG INV ADJ 0.25A DL 10DFN RoHS:否 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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