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| 型号： | LT3482EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.28A 16QFN |
| 标准包装： | 121 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 90 V |
| 输入电压： | 2.5 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 650kHz ~ 1.1MHz |
| 电流 - 输出： | 280mA |
| 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： | 16-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3482
APPLICATIO S I FOR ATIO
Switching Frequency
Table 1. Inrush Peak Current
The LT3482 can operate at either 650kHz nominal or
1.1MHz nominal; the voltage at the f SET pin selects which
frequency is used. At 1.1MHz, a physically smaller induc-
V IN (V)
5
5
L (μH)
10
22
C (μF)
1
1
I P (A)
0.87
0.68
R 1 = R 2 ? OUT 2 – 1 ?
tor and capacitor can be used in a given application, but
higher frequencies will slightly decrease ef?ciency and
maximum duty cycle. Generally if ef?ciency and maximum
duty cycle are crucial, the lower switching frequency should
be selected by connecting f SET to GND. If application size
and cost are more important, connect f SET to V IN to select
the higher switching frequency.
Inrush Current
The LT3482 has built-in Schottky diodes for the boost
and charge pump. When supply voltage is applied to the
V IN pin, the voltage difference between V IN and V OUT1
generates inrush current ?owing from input through the
inductor and the Schottky diode (D1 in the Functional
Diagram) to charge the output capacitor. The selection of
inductor and capacitor value should ensure the peak of
the inrush current to be below 1A. In addition, the LT3482
turn-on should be delayed until the inrush current is less
than the maximum current limit. The peak inrush current
can be estimated as follows:
Setting Output Voltage
The LT3482 is equipped with both an internal 1.235V refer-
ence and an auxiliary reference input (the CTRL pin). This
allows users to select between using the built-in reference
and supplying an external reference voltage. The voltage
at the CTRL pin can be adjusted while the chip is operating
to alter the output voltage of LT3482 for purposes such as
APD’s bias voltage adjustment. To use the internal 1.235V
reference, the CTRL pin should be held higher than 1.5V,
which can be done by tying it to V IN . When the CTRL
pin is between 0V and 1.2V, the LT3482 will regulate the
output such that the FB pin voltage is equal to the CTRL
pin voltage.
To set the output voltage, select the values of R1 and R2
(see Figure 1) according to the following equation:
? V ?
? V REF ?
I P = IN
π
? ?
? ?
V – 0 .6
L
– 1
C
? ?
? ?
? exp ? – ?
? 2 L – 1 ?
C
where V REF = 1.235V if the internal reference is used or
V REF = CTRL if CTRL is between 0V and 1.2V. R2 can be
selected to load the output to maintain a constant switching
frequency when the APD load is very low. Preventing entry
into pulse skipping mode is an important consideration
for post ?ltering the regulator output.
where L is the inductance and C is the output capacitance.
Table 1 gives inrush peak currents for some component
selections.
V OUT2
LT3482
4
R1
13
CTRL
FB
14
R2
3482 F01
Figure 1. Output Voltage Feedback Connection
3482fa
7
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相关代理商/技术参数 |
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| LT3482EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:90V Boost DC/DC Converter with APD Current Monitor |
| LT3482IUD#PBF | 功能描述:IC REG BOOST ADJ 0.28A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT3482IUD#TRPBF | 功能描述:IC REG BOOST ADJ 0.28A 16QFN 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 |
| LT3482IUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:90V Boost DC/DC Converter with APD Current Monitor |
| LT3482IUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:90V Boost DC/DC Converter with APD Current Monitor |
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